TS5205 - Allied Electronics
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
SOT-25
Pin Definition:
1. Input
2. Ground
3. Enable
4. Bypass / Adjust
5. Output
General Description
TS5205 is an efficient linear voltage regulator with ultra low noise output, very low dropout voltage (typically 17mV at
light loads and 165mV at 150mA), and very low power consumption (600uA at 100mA), providing high output current
even when the application requires very low dropout voltage. The Chip Enable (EN) includes a CMOS or TTL
compatible input allows the output to be turned off to prolong battery life. When shutdown, power consumption drops
nearly to zero. TS5205 is included a precision voltage reference, error correction circuit, a current limited output
driver, over temperature shutdown, revered battery protection and a reference bypass pin to improve its already
excellent low-noise performance.
Features
●
●
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Typical Application Circuit
Ultra Low Noise Output
Output Current up to 150mA
Low Dropout Voltage
Low Power Consumption
“Zero” Off-mode Current
Logic Controlled Electronic Enable
Internal Current Limit
Thermal Shutdown Protection
VIN
Package
CBYP
470pF
VIN
EN
Ordering Information
Part No.
on
off
Cellular Telephones
Palmtops, Notebook Computers
Battery Powered Equipment
Consumer and Personal Electronics
SMPS Post Regulator and DC to DC Modules
High-efficiency Linear Power Supplies
Portable Application
off
Packing
TS5205CX5xx RF
SOT-25
3Kpcs / 7” Reel
Note: Where xx denotes voltage option, available are
50=5.0V
33=3.3V
30=3.0V
29=2.9V
28=2.8V
25=2.5V
Leave blank for adjustable version.
Contact factory for additional voltage options.
VOUT
COUT
2.2uF
EN
Application
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●
●
TS5205CX5xx
TS5205CX5
VOUT
R1
on
R2
CBYP
470pF
COUT
2.2uF
Adjustable Version: VOUT = 1.24 (R1+R2)/R1
(Adjustable output range up to 8V)
EN (pin3) may be connected directly to VIN (pin 1)
Low noise operation: CBYP =470pF, COUT >2.2uF
Basic operation: CBYP =not used, COUT >2.2uF
1/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Absolute Maximum Rating (Note 1)
Parameter
Symbol
Limit
Unit
Input Supply Voltage
VIN
-20~ +20
V
Enable Input Voltage
VCE
-20~ +20
V
Power Dissipation (Note 2)
PD
Internal limited
Thermal Resistance
ӨJA
220
Operating Junction Temperature Range
TJ
-40 ~ +125
o
-65 ~ +150
o
Storage Temperature Range
TSTG
o
Lead Soldering Temperature (260 C)
o
C/W
C
C
5
S
Symbol
Limit
Unit
Input Supply Voltage
VIN
+2.5 ~ +16
V
Enable Input Voltage
VCE
0 ~ VIN
V
Recommend Operating Rating (Note 2)
Parameter
Electrical Specification (VIN =Vo+1V, Io=100uA, COUT=1uF, Vce≥2V, TJ = 25oC, unless otherwise specified.)
Parameter
Conditions
Min
Typ
Max
Unit
0.99|Vo|
VOUT
1.01|Vo|
V
Output Voltage
VIN=Vo + 1V
Output Voltage Temp. Coefficient
(Note 4)
--
40
--
ppm/ oC
Line Regulation
Vo+1V ≤ VIN ≤ 16V
--
0.005
0.05
%
Load Regulation (Note 5)
0.1mA ≤ Io ≤ 150mA
--
0.02
0.2
%
Io=100uA
--
17
50
Io=50mA
--
110
150
Io=120mA
--
140
250
Io=150mA
--
165
275
Io=100uA
--
80
125
Io=50mA
--
350
600
Io=120mA
--
600
1000
Io=150mA
--
1300
1900
VIN <0.4V (Shutdown)
--
0.01
1
VIN <0.18V (Shutdown)
--
--
5
Output Current Limit
VOUT=0V
--
300
500
mA
Power Supply Rejection Ratio
At f=100Hz, Io=100uA,
--
75
--
dB
--
0.05
--
%/W
Io=50mA, COUT=2.2uF,
--
260
--
nV√Hz
Enable Input Logic-Low Voltage
Regulation shutdown
--
--
0.4
V
Enable Input Logic-Low Voltage
Regulation enable
2.0
--
--
V
VIL≤ 0.4V
--
0.01
-1
VIH≥ 2.0V
--
5
20
Dropout Voltage (Note 6)
Ground Pin Current (Note 7)
Quiescent Current
Thermal Regulation (Note 8)
Output Noise
mV
uA
uA
Enable Function
Enable input Current
2/7
uA
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Electrical Specification (Continue)
Note:
1. Exceeding the absolute maximum rating may damage the device.
2. The maximum allowable power dissipation at any Ta is Pd(max) = [TJ(MAX) - Ta] + ӨJA. Exceeding the maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
3. The device is not guaranteed to function outside its operating rating.
4, Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature
range.
5, Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for
load regulation in the load range from 1mA to 150mA (5V version) and 1mA to 120mA (VOUT<5V version). Changes
in output voltage due to heating effects are covered by the thermal regulation specification.
6, Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal
value measured at 1V differential.
7, Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from
the supply is the sum of the load current plus the ground pin current.
8, Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is
applied, excluding load or line regulation effects. Specifications are for a 150mA load pulse at VIN=16V for t=10mS.
Block Diagrams
3/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Application Information
Enable Input
TS5205 series feature an active-high (>2V) enable (EN) input that allows ON/OFF control of the regulator. Current
drain reduces to “zero” when the device is shutdown, with only micro-amperes of leakage current. The EN is
compatible with CMOS logic interfacing. EN may be directly tied to VIN and pulled up to the maximum supply voltage.
Input Capacitor Requirement
An input capacitor of 0.1uF or greater is recommended when the device is more than 10” away from the bulk AC
supply capacitance or when the supply is a battery.
Output Capacitor Requirement
The TS5205 series requires an output capacitor to maintain stability and improve transient response is necessary.
2.2uF minimum is recommended. Larger values improve the regulator’s transient response. The output capacitor
value may be increased without limit. The output capacitor should have an ESR (effective series resistance) less
than 5Ω and a resonant frequency above 1MHz. Ultra low ESR capacitors can cause a low amplitude oscillation on
the output and/or under damped transient response. Most of tantalum or aluminum electrolytic capacitors are
adequate; film types will work. Since many aluminum electrolytic have electrolytes that freeze at about –30oC, solid
tantalums are recommended for operation below –25oC. At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to 0.47uF for current below 10mA or 0.33uF for currents
below 1mA.
Reference Bypass Capacitor
Bypass is connected to the internal voltage reference. A 470pF capacitor (CBYPASS) connected from Bypass to
Ground quiets this reference, providing a significant reduction in output noise. CBYPASS reduces the regulator phase
margin; when using CBYPASS, output capacitors of 2.2uF or greater are generally required to maintain stability.
The star up speed of the TS5205 is inversely proportional to the size of the reference bypass capacitor. Applications
requiring a slow ramp up of output voltage should consider larger values of CBYPASS. Likewise, if rapid turn on is
necessary, consider omitting CBYPASS. If output noise is not a major concern, omitted CBYPASS and leave Bypass open.
No Load Stability
The TS5205 series will remain stable and in regulation with no load, unlike many other voltage regulators. This is
especially important in CMOS RAM keep alive applications.
Adjustable Regulator Design
The adjustable regulator versions can be adjusted to a specific output voltage by using two external resistors to
programming the output voltage anywhere between 1.25 and the 8V maximum operating rating of the family.
Two resistors are used. Resistors can be quite large up to 470kΩ, because of the very high input impedance and low
bias current of the sense comparator, the resistor values are calculated by:
A capacitor from Adjust to Ground provides greatly improved noise performance.
TS5205CX5
VOUT
VIN
R1
EN
off
COUT
2.2uF
on
CBYP
470pF
R2
Adjustable Version: VOUT = 1.24 (R1+R2)/R1
(Adjustable output range up to 8V)
4/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Application Information (Continue)
Dual Supply Operation
When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must
be diode clamped to ground.
Thermal Characteristics
TS5205 series is designed to provide 150mA (5V version) of continuous current in a very small package. Maximum
power dissipation can be calculated based on the output current and the voltage drop across the part. To determine
the maximum power dissipation of the package, use the junction-ambient thermal resistance of the device and the
following basic equation:
PD(MAX) = [ TJ(MAX) – TA ] /ΘJA
TJ(MAX) is the maximum junction temperature of the die(125oC), and Ta is the ambient operating temperature. ΘJA is
layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN – VOUT) * IOUT + VIN * IGND
Substituting Pd(max) for Pd and solving for the operating conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For example, when operating the TS5205CX33 at room
temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined
as follows:
o
o
o
PD(MAX) = (125 C – 25 C) / 220 C/W
PD(MAX) = 455mW
The junction to ambient thermal resistance for the minimum footprint is 220oC/W, the maximum power dissipation
must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 120mA, the
maximum input voltage can be determined. From the electrical characteristics table, the maximum ground current for
120mA output current is 2.5mA.
445mW = (VIN – 3.3V) * 150mA + VIN * 2.5mA
445mW = VIN * 150mA – 3.3 * 150mA + VIN * 2.5mA
445mW = VIN * 150mA – 495mW + VIN * 2.5mA
950mW = VIN * 152.5mA
VIN(max) = 6.23V
Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.23V in a SOT-25
package.
Fixed Output Regulator Design
VIN
TS5205CX5xx
TS5205CX5xx
VOUT
VIN
COUT
2.2uF
EN
off
CBYP
470pF
Ultra Low Noise Fixed Voltage Application
VOUT
COUT
2.2uF
on
Low Noise Fixed Voltage Application
Includes a 470pF capacitor for low noise operation and
shows EN connected to IN for an application where
enable/shutdown is not required. COUT= 2.2uF minimum.
An example of a low noise configuration where
bypass is not required. COUT= 2.2uF minimum
5/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
SOT-25 Mechanical Drawing
DIM
A+A1
B
C
D
E
e
H
L
Ө1
S1
SOT-25 DIMENSION
MILLIMETERS
INCHES
MIN
MAX
MIN
MAX.
0.09
1.25
0.0354
0.0492
0.30
0.50
0.0118
0.0197
0.09
0.25
0.0035
0.0098
2.70
3.10
0.1063
0.1220
1.40
1.80
0.0551
0.0709
1.90 BSC
0.0748 BSC
2.40
3.00
0.09449
0.1181
0.35 BSC
0.0138 BSC
0º
10º
0º
10º
0.95 BSC
0.0374 BSC
Marking Diagram
H = Device Code
X = Voltage Code
(5 = 5.0V, S = 3.3V, P = 3.0V, O = 2.9V, N = 2.8V, K = 2.5V)
Y = Year Code
M = Month Code
(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep,
J=Oct, K=Nov, L=Dec)
L = Lot Code
6/7
Version: B07
TS5205
150mA Low Noise LDO Voltage Regulator
with Enable Function
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to any
intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for
such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale
and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability,
or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers
using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for
any damages resulting from such improper use or sale.
7/7
Version: B07
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