PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS213C – MAY 2003 – REVISED MAY 2004
Features
NOMINAL SIZE =
• Up to 6-A Output Current
• 5-V Input Voltage
• Wide-Output Voltage Adjust
(0.8 V to 3.6 V)
• Efficiencies up to 95 %
• 135 W/in³ Power Density
• On/Off Inhibit
• Pre-Bias Startup
• Under-Voltage Lockout
• Operating Temp: –40 to +85 °C
0.87 in x 0.5 in
(22,1 mm x 12,57 mm)
• Auto-Track™ Sequencing
• Output Over-Current Protection
(Non-Latching, Auto-Reset)
• IPC Lead Free 2
• Safety Agency Approvals:
UL 1950, CSA 22.2 950, EN60950
VDE (Pending)
• Point-of-Load Alliance (POLA)
Compatible
Pin Configuration
Description
over the range, 0.8 V to 3.6 V, using a
single resistor.
Other operating features include an
on/off inhibit, output voltage adjust (trim),
and output over-current protection. For
high efficiency these parts employ a
synchronous rectifier output stage, but a
pre-bias hold-off capability ensures that
the output will not sink current during
startup.
Target applications include telecom,
industrial, and general purpose circuits,
including low-power dual-voltage systems
that use a DSP, microprocessor, ASIC, or
FPGA.
Package options include both throughhole and surface mount configurations.
The PTH05050 is one of the smallest
non-isolated power modules from Texas
Instruments that features Auto-Track™.
Auto-Track simplifies supply voltage
sequencing in power systems by enabling
modules to track each other, or any other
external voltage, during power up and
power down.
Although small in size (0.87 in × 0.5 in),
these modules are rated for up to 6 A of
output current, and are an ideal choice in
applications where space, performance,
and a power-up sequencing capability are
important attributes.
The product provides high-performance
step-down conversion from a 5-V input
bus voltage. The output voltage of the
PTH05050W can be set to any voltage
Pin
1
2
3
4
5
6
Function
GND
Track
Vin
Inhibit *
Vo Adjust
Vout
* Denotes negative logic:
Open
= Normal operation
Ground = Function active
™
Track
o
t
u
A
g
encin
u
q
e
S
Standard Application
Rset = Required to set the output voltage to a value
higher than 0.8 V. (See spec. table for values)
Cin = Required 100 µF
Co 1 = Optional 100 µF capacitor
Co 2 = Optional 10 µF ceramic capacitor for reduced
output ripple.
Track
1
2
VIN
3
PTH05050W
(Top View)
4
CIN
100 µF
(Required)
VOUT
6
5
RSET
1 %, 0.1 W
(Required)
Co1
100 µF
Electrolytic
(Optional)
Co2
10 µF
Ceramic
(Optional)
Inhibit
GND
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GND
PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS213C – MAY 2003 – REVISED MAY 2004
Ordering Information
Output Voltage (PTH05050Hxx)
Package Options (PTH05050xHH) (1)
Code
W
Code
AH
AS
Voltage
0.8 V – 3.6 V (Adjust)
Description
Horiz. T/H
SMD, Standard (3)
Pkg Ref.
(EUU)
(EUV)
(2)
Notes: (1) Add “T” to end of part number for tape and reel on SMD packages only.
(2) Reference the applicable package reference drawing for the dimensions and PC board layout
(3) “Standard” option specifies 63/37, Sn/Pb pin solder material.
Pin Descriptions
Vin: The positive input voltage power node to the module, which is referenced to common GND.
Vout: The regulated positive power output with respect
to the GND node.
GND: This is the common ground connection for the
Vin and Vout power connections. It is also the 0 VDC
reference for the control inputs.
Vo Adjust: A 1 % 0.1 W resistor must be directly connected
between this pin and GND to set the output voltage to
a value higher than 0.8 V. The temperature stability of the
resistor should be 100 ppm/°C (or better). The set point
range for the output voltage is from 0.8 V to 3.6 V. The
resistor value required for a given output voltage may be
calculated from the following formula. If this is pin is
left open circuit, the output voltage will default to its
lowest value. For further information on output voltage
adjustment consult the related application note.
Rset
= 10 kΩ ·
0.8 V
Vout – 0.8 V
– 2.49 kΩ
The specification table gives the preferred resistor values
for a number of standard output voltages.
Inhibit: The Inhibit pin is an open-collector/drain negative
logic input that is referenced to GND. Applying a lowlevel ground signal to this input disables the module’s
output and turns off the output voltage. When the Inhibit
control is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left
open-circuit, the module will produce an output whenever a valid input source is applied.
Track: This is an analog control input that enables the
output voltage to follow an external voltage. This pin
becomes active typically 20 ms after the input voltage
has been applied, and allows direct control of the output
voltage from 0 V up to the nominal set-point voltage.
Within this range the output will follow the voltage at
the Track pin on a volt-for-volt basis. When the control
voltage is raised above this range, the module regulates
at its set-point voltage. The feature allows the output
voltage to rise simultaneously with other modules powered from the same input bus. If unused, the input should
be connected to Vin. Note: Due to the under-voltage lockout
feature, the output of the module cannot follow its own input
voltage during power up. For more information, consult the
related application note.
For technical support and further information, visit http://power.ti.com
PTH05050W —5-V Input
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
SLTS213C – MAY 2003 – REVISED MAY 2004
Environmental & Absolute Maximum Ratings
Characteristics
Symbols
Track Input Voltage
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
Mechanical Shock
Vtrack
Ta
Treflow
Ts
Mechanical Vibration
Weight
Flammability
—
—
(Voltages are with respect to GND)
Conditions
Over Vin Range
Surface temperature of module body or pins
—
Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted
Mil-STD-883D, Method 2007.2
20-2000 Hz
Min
Typ
–0.3
–40 (i)
—
—
Max
Units
Vin + 0.3
85
235 (ii)
125
V
°C
°C
°C
–40
—
—
500
—
—
20
—
G’s
—
2.9
—
grams
G’s
Meets UL 94V-O
Notes: (i) For operation below 0 °C the external capacitors m ust bave stable characteristics. use either a low ESR tantalum, Os-Con, or ceramic capacitor.
(ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum.
Specifications
(Unless otherwise stated, T a =25 °C, V in =5 V, Vo =3.3 V, Cin =100 µF, Co1 =0 µF, Co2 =0µF, and Io =I omax)
Characteristics
Symbols
Conditions
Output Current
Input Voltage Range
Set-Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Variation
Io
Vin
Vo tol
∆Regtemp
∆Regline
∆Regload
∆Regtot
0.8 V ≤ Vo ≤ 3.6 V,
Over Io range
Efficiency
η
Vo Ripple (pk-pk)
Over-Current Threshold
Transient Response
Vr
Io trip
Track Input Current (pin 2)
Track Slew Rate Capability
Under-Voltage Lockout
ttr
∆Vtr
IIL track
dVtrack/dt
UVLO
Inhibit Control (pin4)
Input High Voltage
Input Low Voltage
Input Low Current
VIH
VIL
IIL inhibit
Input Standby Current
Switching Frequency
External Input Capacitance
External Output Capacitance
Iin inh
ƒs
Cin
Co1, Co2
Reliability
MTBF
Min
85°C, natural convection
–40 °C <Ta < +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40 °C ≤ T a ≤ +85 °C
Io =4 A
RSET = 698 Ω Vo = 3.3 V
RSET = 2.21 kΩ Vo = 2.5 V
RSET = 4.12 kΩ Vo = 2.0 V
RSET = 5.49 kΩ Vo = 1.8 V
RSET = 8.87 kΩ Vo = 1.5 V
RSET = 17.4 kΩ Vo = 1.2 V
RSET = 36.5 kΩ Vo = 1.0 V
20 MHz bandwidth, Co2 =10 µF ceramic
Reset, followed by auto-recovery
1 A/µs load step, 50 to 100 % Iomax,
Co1 =100 µF
Recovery Time
Vo over/undershoot
Pin to GND
Cout ≤ Cout(max)
Vin increasing
Vin decreasing
Referenced to GND
Pin to GND
Inhibit (pin 4) to GND, Track (pin 2) open
Over Vin and Io ranges
Capacitance value
non-ceramic
ceramic
Equiv. series resistance (non-ceramic)
Per Bellcore TR-332
50 % stress, Ta =40 °C, ground benign
PTH05050W
Typ
Max
Units
0
4.5
—
—
—
—
—
—
—
±0.5
±10
±12
6
5.5
±2
—
—
—
(1)
—
—
±3
(2)
—
—
—
—
—
—
—
—
—
95
93
91
90
89
87
85
20 (3)
12
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3.4
70
100
—
—
4.3
3.7
—
—
–130
1
4.45
—
Vin –0.5
–0.2
—
—
550
100 (5)
0
0
4 (8)
—
—
–130
10
600
—
100 (6)
—
—
Open
0.6
—
—
650
—
3,300
300
—
6
—
—
(2)
A
V
%Vo
%Vo
mV
mV
%Vo
%
mVpp
A
(4)
µSec
mV
µA
V/ms
V
(4)
V
µA
mA
kHz
µF
(7)
µF
mΩ
106 Hrs
Notes: (1) No derating is required when the module is soldered directly to a 4-layer PCB with 1 oz. copper.
(2) The set-point voltage tolerance is affected by the tolerance and stability ofRSET . The stated limit is unconditionally met if R SET has a tolerance of 1 %
with 100 ppm/°C or better temperature stability.
(3) The pk-pk output ripple voltage is measured with an external 10 µF ceramic capacitor. See the standard application schematic.
(4) This control pin has an internal pull-up to the input voltage Vin. If it is left open-circuit the module will operate when input power is applied. A small
low-leakage (<100 nA) MOSFET is recommended for control. For further information, consult the related application note.
(5) A 100 µF input capacitor is required for proper operation. The capacitor must be rated for a minimum of 300 mA rms of ripple current.
(6) An external output capacitor is not required for basic operation. Adding 100 µF of distributed capacitance at the load will improve the transient response.
(7) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance.
(8) This is the typcial ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 mΩ as the minimum when using max-ESR values to calculate.
For technical support and further information, visit http://power.ti.com
PTH05050W —5-V Input
Typical Characteristics
6-A, 5-V Input Non-Isolated
Wide-Output Adjust Power Module
Characteristic Data; Vin =5 V
SLTS213C – MAY 2003 – REVISED MAY 2004
(See Note A)
Efficiency vs Load Current
100
Efficiency - %
90
VOUT
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
80
70
60
50
0
1
2
3
4
5
6
Iout - Amps
Output Ripple vs Load Current (See Note 3 to Table)
50
Ripple - mV
40
VOUT
2.5
3.3
1.8
1.5
1.2
1.0
30
20
V
V
V
V
V
V
10
0
0
1
2
3
4
5
6
Iout - Amps
Power Dissipation vs Load Current
1.50
1.25
Pd - Watts
1.00
0.75
0.50
0.25
0.00
0
1
2
3
4
5
6
Iout - Amps
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
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Application Notes
PTH03050W & PTH05050W
Capacitor Recommendations for the PTH03050 &
PTH05050 Series of Power Modules
Input Capacitor
The recommended input capacitor(s) is determined by
the 100 µF [1] minimum capacitance and 300 mArms
minimum ripple current rating.
Ripple current, less than 100 mΩ equivalent series resistance (ESR), and temperature are the major considerations
when selecting input capacitors. Unlike polymer tantalum,
regular tantalum capacitors have a recommended minimum voltage rating of 2 × (maximum DC voltage + AC
ripple). This is standard practice to ensure reliability.
For improved ripple reduction on the input bus, ceramic
capacitors may be used to complement electrolytic types
and achieve the minimum required capacitance.
Output Capacitors (Optional)
For applications with load transients (sudden changes in
load current), regulator response will benefit from an
external output capacitance. The recommended output
capacitance of 100 µF will allow the module to meet its
transient response specification (see product data sheet).
For most applications, a high quality computer-grade
aluminum electrolytic capacitor is adequate. These capacitors provide decoupling over the frequency range, 2 kHz
to 150 kHz, and are suitable when ambient temperatures
above 0 °C. For operation below 0 °C tantalum, ceramic
or Os-Con type capacitors are recommended. When using
one or more non-ceramic capacitors, the calculated equivalent ESR should be no lower than 4 mΩ (7 mΩ using the
manufacturer’s maximum ESR for a single capacitor). A
list of preferred low-ESR type capacitors are identified
in Table 1-1.
Ceramic Capacitors
Above 150 kHz the performance of aluminum electrolytic
capacitors becomes less effective. To further improve the
reflected input ripple current or the output transient
response, multilayer ceramic capacitors can also be added.
Ceramic capacitors have very low ESR and their resonant
frequency is higher than the bandwidth of the regulator.
When used on the output their combined ESR is not
critical as long as the total value of ceramic capacitance
does not exceed 300 µF. Also, to prevent the formation of
local resonances, do not place more than five identical ceramic capacitors in parallel with values of 10 µF or greater.
Tantalum Capacitors
Tantalum type capacitors can be used at both the input
and output, and are recommended for applications where
the ambient operating temperature can be less than 0 °C.
The AVX TPS, Sprague 593D/594/595 and Kemet T495/
For technical support and further information, visit http://power.ti.com
T510 capacitor series are suggested over many other
tantalum types due to their higher rated surge, power
dissipation, and ripple current capability. As a caution
many general purpose tantalum capacitors have considerably higher ESR, reduced power dissipation and lower
ripple current capability. These capacitors are also less
reliable as they have reduced power dissipation and surge
current ratings. Tantalum capacitors that do not have a
stated ESR or surge current rating are not recommended
for power applications.
When specifying Os-Con and polymer tantalum capacitors
for the output, the minimum ESR limit will be encountered well before the maximum capacitance value is
reached.
Capacitor Table
Table 1-1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The recommended number of capacitors
required at both the input and output buses is identified
for each capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those
listed are for guidance. The RMS ripple current rating and
ESR (at 100kHz) are critical parameters necessary to insure
both optimum regulator performance and long capacitor life.
Designing for Very Fast Load Transients
The transient response of the DC/DC converter has been
characterized using a load transient with a di/dt of 1 A/µs.
The typical voltage deviation for this load transient is
given in the data sheet specification table using the
optional value of output capacitance. As the di/dt of a
transient is increased, the response of a converter’s regulation circuit ultimately depends on its output capacitor
decoupling network. This is an inherent limitation with
any DC/DC converter once the speed of the transient
exceeds its bandwidth capability. If the target application
specifies a higher di/dt or lower voltage deviation, the
requirement can only be met with additional output
capacitor decoupling. In these cases special attention
must be paid to the type, value and ESR of the capacitors
selected.
If the transient performance requirements exceed that
specified in the data sheet, or the total amount of load
capacitance is above 3,000 µF, the selection of output
capacitors becomes more important. For further guidance
consult the separate application note, “Selecting Output
Capacitors for PTH Products in High-Performance Applications.”
Application Notes
PTH03050W & PTH05050W
Table 1-1: Input/Output Capacitors
Capacitor Vendor, Type
Series (Style)
Capacitor Characteristics
Quantity
Working
Voltage
Value (µF)
Max. (ESR)
at 100 kHz
Max. Ripple
at 85 °C
Current (Irms)
Physical Size
(mm)
Input
Bus
Output
Bus
Panasonic
FC, Aluminum (SMD)
WA, Poly-Aluminum (SMD)
25 V
10 V
100 µF
120 µF
0.300 Ω
0.035 Ω
450 mA
2800 mA
8×10
8.3×6.9
1
1
1
≤5
EEVFC1E101P
EEFWA1A121P
Panasonic, Aluminum
FC (Radial)
FK (SMD)
16 V
16 V
220 µF
330 µF
0.150 Ω
0.160 Ω
555 mA
600 mA
10×10.2
8×10.2
1
1
1
1
EEUFC1C221
EEVFK1C331P
United Chemi–Con
FS, Os-con (Radial)
PXA , Poly-Alum (SMD)
MVZ, Aluminum (SMD)
PS, Poly-Alum. (Radial)
10 V
10 V
16 V
10 V
100 µF
120 µF
220 µF
100 µF
0.040 Ω
0.027 Ω
0.170 Ω
0.024 Ω
2100 mA
2430 mA
450 mA
4420 mA
6.3×9.8
8×6.7
8×10
8×11.5
1
1
1
1
≤5
≤4
1
≤4
Nichicon, Aluminum
WG, Aluminum (SMD)
PM, (Radial)
F55, Tantalum (SMD)
35 V
25 V
10 V
100 µF
150 µF
100 µF
0.150 Ω
0.160 Ω
0.055 Ω
670 mA
460 mA
2000 mA
10×10
10×11.5
7.7×4.3
1
1
1
1
1
1
Sanyo
SVP, Os-con (SMD)
SP, Os-con (Radial)
TPE Poscap Polymer (SMD)
10 V
16 V
10 V
120 µF
100 µF
220 µF
0.040 Ω
0.025 Ω
0.025 Ω
>2500 mA
>2800 mA
>2400mA
7×8
6.3×9.8
7.3×5.7
1
1
1
≤5
≤4
≤4
10SVP120M
16SPS100M
10TPE220ML
10 V
10 V
100 µF
220 µF
0.100 Ω
0.100 Ω
>1090 mA
>1414 mA
7.3L
×4.3W ×4.1H
1
1
≤5
≤5
TPSD107M010R0100
TPSV227M010R0100
Kemet
T520, Poly-Alum (SMD)
T495,Tantalum (SMD)
A700-Poly-Alum. (SMD)
10 V
10 V
6.3 V
100 µF
100 µF
100 µF
0.080 Ω
0.100 Ω
0.018 Ω
1200 mA
>1100 mA
2900 mA
7.3L ×5.7W
×4.0H
1
1
1
1
1
≤3
T520D107M010AS
T495X107M010AS
A700D107M006AT
Vishay-Sprague
594D, Tantalum (SMD)
595D, Tantalum (SMD)
94SA, Os-con (Radial)
10 V
10 V
10 V
150 µF
120 µF
100 µF
0.090 Ω
0.140 Ω
0.030 Ω
1100 mA
>1000 mA
2670 mA
7.3L
×6.0W ×4.1H
8×10.5
1
1
1
1
1
≤4
594D157X0010C2T
595D127X0010D2T
94SA107X0010EBP
Kemet, Ceramic X5R (SMD)
16 V
6.3 V
10
47
0.002 Ω
0.002 Ω
—
1210 case
3225 mm
1
2 [1]
≤5
≤5
C1210C106M4PAC
C1210C476K9PAC
Murata, Ceramic X5R (SMD)
6.3 V
6.3 V
16 V
16 V
100
47
22
10
0.002 Ω
—
1210 case
3225 mm
1
2 [1]
5
1 [2]
≤3
≤5
≤5
≤5
GRM32ER60J107M
GRM32ER60J476M
GRM32ER61C226K
GRM32DR61C106K
TDK, Ceramic X5R (SMD)
6.3 V
6.3 V
16 V
16 V
100
47
22
10
0.002 Ω
—
1210 case
3225 mm
1
2 [1]
5
1 [2]
≤3
≤5
≤5
≤5
C3225X5R0J107MT
C3225X5R0J476MT
C3225X5R1C226MT
C3225X5R1C106MT
AVX, Tantalum
TPS (SMD)
[1]
[2]
Vendor Number
10FS100M
PXA10VC121MH80TP
MVZ25VC221MH10TP
10PS270MH11
UWG1V101MNR1GS
UPM1E151MPH
F551A107MN
Total capacitance of 94 µF is acceptable based on the combined ripple current rating.
Small ceramic capacitors may be used to complement electrolytic types at the input to reduce high-frequency ripple current.
For technical support and further information, visit http://power.ti.com
Application Notes
PTH03050W & PTH05050W
Adjusting the Output Voltage of the PTH03050W &
PTH05050W Wide-Output Adjust Power Modules
The Vo Adjust control (pin 5) sets the output voltage to a
value higher than 0.8 V. The adjustment range of the
PT03050W (3.3-V input) is from 0.8 V to 2.5 V 1, and
the PTH05050W (5-V input) from 0.8 V to 3.6 V. The
adjustment method requires the addition of a single
external resistor, R set, that must be connected directly
between the Vo Adjust and GND pins 2. Table 2-1 gives
the preferred value of the external resistor for a number
of standard voltages, along with the actual output voltage that this resistance value provides.
For other output voltages the value of the required resistor
can either be calculated using the following formula, or
simply selected from the range of values given in Table 2-2.
Figure 2-1 shows the placement of the required resistor.
Rset
0.8 V
Vout – 0.8 V
= 10 kΩ ·
– 2.49 kΩ
Table 2-1; Preferred Values of Rset for Standard Output Voltages
Vout (Standard)
Rset (Pref’d Value)
3.3 V 1
2.5 V
2V
1.8 V
1.5 V
1.2 V
1V
0.8 V
698 Ω
2.21 kΩ
4.12 kΩ
5.49 kΩ
8.87 kΩ
17.4 kΩ
36.5 kΩ
Open
Vout (Actual)
3.309V
2.502 V
2.010 V
1.803 V
1.504 V
1.202 V
1.005 V
0.8 V
Figure 2-1; Vo Adjust Resistor Placement
2
Table 2-2; Output Voltage Set-Point Resistor Values
Va Req’d
0.800
0.825
0.850
0.875
0.900
0.925
0.950
0.975
1.000
1.025
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
1.450
1.475
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
Rset
Open
318 kΩ
158 kΩ
104 kΩ
77.5 kΩ
61.5 kΩ
50.8 kΩ
43.2 kΩ
37.5 kΩ
33.1 kΩ
29.5 kΩ
26.6 kΩ
24.2 kΩ
22.1 kΩ
20.4 kΩ
18.8 kΩ
17.5 kΩ
16.3 kΩ
15.3 kΩ
14.4 kΩ
13.5 kΩ
12.7 kΩ
12.1 kΩ
11.4 kΩ
10.8 kΩ
10.3 kΩ
9.82 kΩ
9.36 kΩ
8.94 kΩ
8.18 kΩ
7.51 kΩ
6.92 kΩ
6.4 kΩ
5.93 kΩ
5.51 kΩ
5.13 kΩ
4.78 kΩ
4.47 kΩ
Va Req’d
2.00
2.05
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
2.65
2.70
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.60
Rset
4.18 kΩ
3.91 kΩ
3.66 kΩ
3.44 kΩ
3.22 kΩ
3.03 kΩ
2.84 kΩ
2.67 kΩ
2.51 kΩ
2.36 kΩ
2.22 kΩ
2.08 kΩ
1.95 kΩ
1.83 kΩ
1.72 kΩ
1.61 kΩ
1.51 kΩ
1.41 kΩ
1.32 kΩ
1.23 kΩ
1.15 kΩ
1.07 kΩ
988 Ω
914 Ω
843 Ω
775 Ω
710 Ω
647 Ω
587 Ω
529 Ω
473 Ω
419 Ω
367 Ω
Track
3
VIN
PTH03050W
Inhibit
VO
VOUT
6
GND
4
CIN
100 µF
(Required)
1
5
RSET
1%
0.1 W
+
GND
For technical support and further information, visit http://power.ti.com
+
VIN
COUT
100 µF
(Optional)
Notes:
1. Modules that operate from a 3.3-V input bus should
not be adjusted higher than 2.5 V.
2. A 0.05-W resistor may be used. The tolerance should
be 1%, with temperature stability of 100 ppm/°C (or
better). Place the resistor as close to the regulator as
possible. Connect the resistor directly between pins 5
and 1 using dedicated PCB traces.
3. Never connect capacitors from Vo Adjust to either GND or
Vout. Any capacitance added to the Vo Adjust pin will affect
the stability of the regulator.
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Features of the PTH Family of Non-Isolated
Wide Output Adjust Power Modules
The PTVxx010 and PTVxx020 are similar parts offered
in a vertical, single in-line pin (SIP) profile, at slightly
lower current ratings.
POLA™
All of the products referenced in Table 3-1 include AutoTrack™. This feature was specifically designed to simplify
the task of sequencing the supply voltages in a power
system. This and other features are described in the following sections.
From the basic, “Just Plug it In” functionality of the 6-A
modules, to the 30-A rated feature-rich PTHxx030, these
products were designed to be very flexible, yet simple to
use. The features vary with each product. Table 3-1 provides a quick reference to the features by product series
and input bus voltage.
Soft-Start Power Up
The Auto-Track feature allows the power-up of multiple
modules to be directly controlled from their Track pin.
However in a stand-alone configuration, or when the
Auto-Track feature is not being used, the Track pin should
be directly connected to the input voltage, Vin (see Figure 3-1).
Figure 3–1
10
Up
Table 3-1; Operating Features by Series and Input Bus Voltage
PTHxx020
PTVxx020
PTHxx030
12 V
6A
3.3 V / 5 V
10 A
12 V
8A
3.3 V / 5 V
15 A
12 V
12 A
5V
8A
12 V
8A
3.3 V / 5 V
22 A
12 V
18 A
5V
18 A
12 V
16 A
3.3 V / 5 V
30 A
12 V
26 A
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Thermal Shutdown
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Output Sense
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Margin Up/Down
6A
Auto-Track™
PTVxx010
5V
Pre-Bias Startup
PTHxx010
6A
Over-Current
PTHxx060
I OUT
On/Off Inhibit
PTHxx050
Input Bus
3.3 V
2
3
CIN
1,000 µF
5
Sense
PTH05020W
V IN
Inhibit
+
Series
Adjust (Trim)
5V
8
Track
9
Dn
3.3 V
6
Adjust
GND
1
VO
7
4
R SET, 698 Ω
0.1 W, 1 %
+
Compatibility
The PTH/PTV family of non-isolated, wide-output adjust
power modules from Texas Instruments are optimized
for applications that require a flexible, high performance
module that is small in size. Each of these products are
POLA™ compatible. POLA-compatible products are
produced by a number of manufacturers, and offer customers advanced, non-isolated modules with the same
footprint and form factor. POLA parts are also asssured
to be interoperable, thereby providing customers with true
second- source availability.
C OUT
330 µF
GND
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
GND
When the Track pin is connected to the input voltage the
Auto-Track function is permanently disengaged. This
allows the module to power up entirely under the control
of its internal soft-start circuitry. When power up is under
soft-start control, the output voltage rises to the set-point
at a quicker and more linear rate.
•
•
•
•
•
•
Figure 3–2
Vin (1 V/Div)
Vout (1 V/Div)
For simple point-of-use applications, the PTHxx050
provides operating features such as an on/off inhibit,
output voltage trim, pre-bias startup, and over-current
protection. The PTHxx060 (10 A), and PTHxx010 (15/12 A)
include an output voltage sense, and margin up/down
controls. Then the higher output current, PTHxx020
and PTHxx030 products incorporate over-temperature
shutdown protection.
For technical support and further information visit http://power.ti.com
Iin (5 A/Div)
HORIZ SCALE: 5 ms/Div
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
The power modules function normally when the Inhibit
pin is left open-circuit, providing a regulated output
whenever a valid source voltage is connected to Vin with
respect to GND.
Figure 3-3 shows the typical application of the inhibit
function. Note the discrete transistor (Q1). The Inhibit
control has its own internal pull-up to Vin potential. The
input is not compatible with TTL logic devices. An opencollector (or open-drain) discrete transistor is recommended
for control.
Figure 3–3
V o Sense
Over-Current Protection
Over-Temperature Protection
The PTHxx020 and PTHxx030 series of products have
over-temperature protection. These products have an
on-board temperature sensor that protects the module’s
internal circuitry against excessively high temperatures.
A rise in the internal temperature may be the result of a
drop in airflow, or a high ambient temperature. If the
internal temperature exceeds the OTP threshold, the
module’s Inhibit control is automatically pulled low. This
turns the output off. The output voltage will drop as the
external output capacitors are discharged by the load
circuit. The recovery is automatic, and begins with a
soft-start power up. It occurs when the the sensed temperature decreases by about 10 °C below the trip point.
10
VIN
2
8
5
1
7
Q1
BSS138
VOUT
6
4
RSET
COUT
330 µF
L
O
A
D
1 =Inhibit
GND
GND
Turning Q1 on applies a low voltage to the Inhibit control
and disables the output of the module. If Q1 is then turned
off, the module will execute a soft-start power-up. A
regulated output voltage is produced within 20 msec.
Figure 3-4 shows the typical rise in both the output voltage and input current, following the turn-off of Q1. The
turn off of Q1 corresponds to the rise in the waveform,
Q1 Vds. The waveforms were measured with a 5-A load.
Figure 3–4
Note: The over-temperature protection is a last resort mechanism to prevent thermal stress to the regulator. Operation at
or close to the thermal shutdown temperature is not recommended and will reduce the long-term reliability of the module.
Always operate the regulator within the specified Safe Operating
Area (SOA) limits for the worst-case conditions of ambient
temperature and airflow.
Vo (2V/Div)
Iin (2A/Div)
Output On/Off Inhibit
For applications requiring output voltage on/off control,
each series of the PTH family incorporates an output
Inhibit control pin. The inhibit feature can be used wherever there is a requirement for the output voltage from
the regulator to be turned off.
9
PTH05020W
3
CIN
1,000 µF
+
For protection against load faults, all modules incorporate
output over-current protection. Applying a load that
exceeds the regulator’s over-current threshold will cause
the regulated output to shut down. Following shutdown
a module will periodically attempt to recover by initiating
a soft-start power-up. This is described as a “hiccup” mode
of operation, whereby the module continues in a cycle of
successive shutdown and power up until the load fault is
removed. During this period, the average current flowing
into the fault is significantly reduced. Once the fault is
removed, the module automatically recovers and returns
to normal operation.
+
From the moment a valid input voltage is applied, the
soft-start control introduces a short time delay (typically
5 ms-10 ms) before allowing the output voltage to rise.
The output then progressively rises to the module’s setpoint voltage. Figure 3-2 shows the soft-start power-up
characteristic of the 22-A output product (PTH05020W),
operating from a 5-V input bus and configured for a 3.3-V
output. The waveforms were measured with a 5-A resistive
load, with Auto-Track disabled. The initial rise in input
current when the input voltage first starts to rise is the
charge current drawn by the input capacitors. Power-up
is complete within 15 ms.
Q1Vds (5V/Div)
HORIZ SCALE: 10ms/Div
For technical support and further information visit http://power.ti.com
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Auto-Track™ Function
The Auto-Track function is unique to the PTH/PTV
family, and is available with the all POLA-compatible
products. Auto-Track was designed to simplify the amount
of circuitry required to make the output voltage from each
module power up and power down in sequence. The
sequencing of two or more supply voltages during power
up is a common requirement for complex mixed-signal
applications, that use dual-voltage VLSI ICs such as DSPs,
micro-processors, and ASICs.
How Auto-Track Works
Auto-Track works by forcing the module’s output voltage
to follow a voltage presented at the Track control pin. This
control range is limited to between 0 V and the module’s
set-point voltage. Once the track-pin voltage is raised
above the set-point voltage, the module’s output remains
at its set-point 1. As an example, if the Track pin of a 2.5-V
regulator is at 1 V, the regulated output will be 1 V. But
if the voltage at the Track pin rises to 3 V, the regulated
output will not go higher than 2.5 V.
When under track control, the regulated output from
the module follows the voltage at its Track pin on a voltfor-volt basis. By connecting the Track pin of a number
of these modules together, the output voltages will follow a common signal during power-up and power-down.
The control signal can be an externally generated master
ramp waveform, or the output voltage from another power
supply circuit 3. For convenience the Track control incorporates an internal RC charge circuit. This operates off
the module’s input voltage to provide a suitable rising
voltage ramp waveform.
Typical Application
The basic implementation of Auto-Track allows for
simultaneous voltage sequencing of a number of AutoTrack compliant modules. Connecting the Track control
pins of two or more modules forces the Track control of
all modules to follow the same collective RC ramp waveform, and allows them to be controlled through a single
transistor or switch; Q1 in Figure 3-5.
To initiate a power-up sequence the Track control must
first pulled to ground potential. This should be done at
or before input power is applied to the modules, and then
held for at least 10 ms thereafter. This brief period gives
the modules time to complete their internal soft-start
initialization, which enables them to produce an output
voltage.
Applying a logic-level high signal to the circuit’s On/Off
Control turns Q1 on and applies a ground signal to the
Track control. After completing their internal soft-start
intialization, the output of all modules will remain at zero
volts while Q1 is on. 10 ms after a valid input voltage has
been applied to all modules, Q1 can be turned off. This
allows the track control voltage to automatically rise
toward to the modules' input voltage. During this period
the output voltage of each module will rise in unison with
For technical support and further information visit http://power.ti.com
other modules, to its respective set-point voltage.
Figure 3-6 shows the output voltage waveforms from the
circuit of Figure 3-5 after the On/Off Control is set from a
high to a low-level voltage. The waveforms, Vo1 and Vo2
represent the output voltages from the two power modules, U1 (3.3 V) and U2 (1.8 V) respectively. Vo1 and Vo2
are shown rising together to produce the desired simultaneous power-up characteristic.
The same circuit also provides a power-down sequence.
Power down is the reverse of power up, and is accomplished by lowering the track control voltage back to zero
volts. The important constraint is that a valid input voltage
must be maintained until the power down is complete. It
also requires that Q1 be turned off relatively slowly. This
is so that the Track control voltage does not fall faster than
Auto-Track's slew rate capability, which is 1 V/ms. The
components R1 and C1 in Figure 3-5 limit the rate at
which Q1 can pull down the Track control voltage. The
values of 100 k-ohm and 0.1 µF correlate to a decay rate
of about 0.17 V/ms.
The power-down sequence is initiated with a low-to-high
transition at the On/Off Control input to the circuit.
Figure 3-7 shows the power-down waveforms. As the
Track control voltage falls below the nominal set-point
voltage of each power module, then its output voltage
decays with all the other modules under Auto-Track
control.
Notes on Use of Auto-Track™
1. The Track pin voltage must be allowed to rise above
the module’s set-point voltage before the module can
regulate at its adjusted set-point voltage.
2. The Auto-Track function will track almost any voltage
ramp during power up, and is compatible with ramp
speeds of up to 1 V/ms.
3. The absolute maximum voltage that may be applied to the
Track pin is Vin.
4. The module will not follow a voltage at its Track control
input until it has completed its soft-start initialization.
This takes about 10 ms from the time that the module
has sensed that a valid voltage has been applied its input.
During this period, it is recommended that the Track
pin be held at ground potential.
5. The module is capable of both sinking and sourcing
current when following a voltage at its Track pin.
Therefore startup into an output prebias is not supported
during Auto-Track control. Note: A pre-bias holdoff is
not necessary when all supply voltages rise simultaneously
under the control of Auto-Track.
6. The Auto-Track function can be disabled by connecting
the Track pin to the input voltage (Vin). With Auto-Track
disabled, the output voltage will rise at a quicker and
more linear rate after input power is applied.
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Figure 3–5; Sequenced Power Up & Power Down Using Auto-Track
U1
10
9
8
5
Track
PTH05020W
VIN
Inhibit
Vo1 =3.3 V
6
GND
+
3
C IN
VO
1
+
2
+5 V
4
7
C OUT
R2
698
C1
0.1 µF
U2
R1
100 k
9
8
5
Track
2
+
C IN
0V
Figure 3–6; Simultaneous Power Up with Auto-Track Control
HORIZ SCALE: 10 ms/Div
10
Q1
BSS138
PTH05010W
VIN
Inhibit
3
VO
Vo2 =1.8 V
6
GND
1
7
4
R3
5k49
+
On/Off Control
1 = Power Down
0 = Power Up
C OUT
Figure 3–7; Simultaneous Power Down with Auto-Track Control
Vo1 (1 V/Div)
Vo1 (1 V/Div)
Vo2 (1 V/Div)
Vo2 (1 V/Div)
On/Off Input
(5 V/Div)
On/Off Input
(5 V/Div)
HORIZ SCALE: 10 ms/Div
For technical support and further information visit http://power.ti.com
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Margin Up/Down Controls
Notes:
The PTHxx060, PTHxx010, PTHxx020, and PTHxx030
products incorporate Margin Up and Margin Down control inputs. These controls allow the output voltage to be
momentarily adjusted 1, either up or down, by a nominal
5%. This provides a convenient method for dynamically
testing the operation of the load circuit over its supply
margin or range. It can also be used to verify the function
of supply voltage supervisors. The ±5% change is applied
to the adjusted output voltage, as set by the external resistor, Rset at the Vo Adjust pin.
The 5% adjustment is made by pulling the appropriate
margin control input directly to the GND terminal 2.
A low-leakage open-drain device, such as an n-channel
MOSFET or p-channel JFET is recommended for this
purpose 3. Adjustments of less than 5% can also be accommodated by adding series resistors to the control inputs.
The value of the resistor can be selected from Table 3-2,
or calculated using the following formula.
Up/Down Adjust Resistance Calculation
1. The Margin Up* and Margin Dn* controls were not
intended to be activated simultaneously. If they are
their affects on the output voltage may not completely
cancel, resulting in the possibility of a slightly higher
error in the output voltage set point.
2. The ground reference should be a direct connection to
the module GND at pin 7 (pin 1 for the PTHxx050).
This will produce a more accurate adjustment at the
load circuit terminals. The transistors Q1 and Q2 should
be located close to the regulator.
3. The Margin Up and Margin Dn control inputs are not
compatible with devices that source voltage. This includes
TTL logic. These are analog inputs and should only be
controlled with a true open-drain device (preferably
a discrete MOSFET transistor). The device selected
should have low off-state leakage current. Each input
sources 8 µA when grounded, and has an open-circuit
voltage of 0.8 V.
To reduce the margin adjustment to a value less than 5%,
series resistors are required (See RD and RU in Figure 3-8).
For the same amount of adjustment, the resistor value
calculated for RU and RD will be the same. The formulas
is as follows.
RU or RD =
499
∆%
– 99.8
Table 3-2; Margin Up/Down Resistor Values
% Adjust
5
4
3
2
1
kΩ
Where ∆% = The desired amount of margin adjust in
percent.
RU / RD
0.0 kΩ
24.9 kΩ
66.5 kΩ
150.0 kΩ
397.0 kΩ
Figure 3–8; Margin Up/Down Application Schematic
10
9
8
1
7
0V
PTH05010W
(Top View)
VIN
2
RD
4
5
RU
RSET
0.1 W, 1 %
Cin
MargDn
+VOUT
6
3
+
+Vo
+
Cout
L
O
A
D
Q1
MargUp
GND
For technical support and further information visit http://power.ti.com
Q2
GND
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Pre-Bias Startup Capability
Notes
A pre-bias startup condition occurs as a result of an external
voltage being present at the output of a power module prior
to its output becoming active. This often occurs in complex digital systems when current from another power
source is backfed through a dual-supply logic component,
such as an FPGA or ASIC. Another path might be via
clamp diodes as part of a dual-supply power-up sequencing
arrangement. A prebias can cause problems with power
modules that incorporate synchronous rectifiers. This is
because under most operating conditions, these types of
modules can sink as well as source output current.
1. Startup includes the short delay (approx. 10 ms) prior
to the output voltage rising, followed by the rise of the
output voltage under the module’s internal soft-start
control. Startup is complete when the output voltage
has risen to either the set-point voltage or the voltage
at the Track pin, whichever is lowest.
2. To ensure that the regulator does not sink current when
power is first applied (even with a ground signal applied
to the Inhibit control pin), the input voltage must always
be greater than the output voltage throughout the
power-up and power-down sequence.
The PTH/PTV family of power modules incorporate
synchronous rectifiers, but will not sink current during
startup 1, or whenever the Inhibit pin is held low. However,
to ensure satisfactory operation of this function, certain
conditions must be maintained. 2 Figure 3-9 shows an
application demonstrating the pre-bias startup capability.
The start-up waveforms are shown in Figure 3-10. Note
that the output current from the PTH03010W (Io) shows
negligible current until its output voltage rises above
that backfed through diodes D1 and D2.
3. The Auto-Track function can be disabled at power up
by immediately applying a voltage to the module’s Track
pin that is greater than its set-point voltage. This can
be easily accomplished by connecting the Track pin to
Vin.
Figure 3–10; Pre-Bias Startup Waveforms
Note: The pre-bias start-up feature is not compatible with
Auto-Track. When the module is under Auto-Track control,
it will sink current if the output voltage is below that of a
back-feeding source. To ensure a pre-bias hold-off one of two
approaches must be followed when input power is applied to
the module. The Auto-Track function must either be disabled 3,
or the module’s output held off (for at least 50 ms) using the
Inhibit pin. Either approach ensures that the Track pin voltage is above the set-point voltage at start up.
Vin (1 V/Div)
Vo (1 V/Div)
Io (5 A/Div)
HORIZ SCALE: 5 ms/Div
Figure 3–9; Application Circuit Demonstrating Pre-Bias Startup
VIN = 3.3 V
10
2
3
CIN
330 µF
8
5
Track
Sense
PTH03010W
V IN
Inhibit
+
9
GND
1
VO
Vo = 2.5 V
6
+
Vadj
7
Io
4
R2
2k21
VCCIO
VCORE
+
C OUT
330 µF
ASIC
For technical support and further information visit http://power.ti.com
Application Notes
PTH/PTV Series of Wide-Output Adjust
Power Modules (3.3/5-V Input)
Remote Sense
Products with this feature incorporate an output voltage
sense pin, V o Sense. A remote sense improves the load
regulation performance of the module by allowing it to
compensate for any ‘IR’ voltage drop between itself and
the load. An IR drop is caused by the high output current
flowing through the small amount of pin and trace resistance. To use this feature simply connect the Vo Sense pin
to the Vout node, close to the load circuit (see data sheet
standard application). If not used, the V o Sense pin can
be left open-circuit. An internal low-value resistor (15-Ω
or less) is connected between the Vo Sense and Vout. This
ensures the output voltage remains in regulation.
With the sense pin connected, the difference between
the voltage measured directly between the Vout and GND
pins, and that measured from V o Sense to GND, is the
amount of IR drop being compensated by the regulator.
This should be limited to a maximum of 0.3 V.
Note: The remote sense feature is not designed to compensate
for the forward drop of non-linear or frequency dependent
components that may be placed in series with the converter
output. Examples include OR-ing diodes, filter inductors,
ferrite beads, and fuses. When these components are enclosed
by the remote sense connection they are effectively placed
inside the regulation control loop, which can adversely affect
the stability of the regulator.
For technical support and further information visit http://power.ti.com
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