AMS AS1326 Datasheet
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Pubblicità
austriamicrosystems AG is now ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0 e-Mail: [email protected]
Please visit our website at
www.ams.com
Datasheet
A S 1 3 2 6
H i g h C u r r e n t , 0 . 8 A D C - D C St e p - U p C o n v e r t e r s
1 General Description 2 Key Features
The AS1326A/AS1326B are high-efficiency, high current, DC-DC step-up converters specifically designed for battery-powered wireless applications. Low quiescent supply current (65µA), high operating frequency (1MHz), and minimal external component requirements make these devices perfect for small hand-held applications.
Table 1. Standard Products
Model
AS1326A
AS1326B
Input Signal Activation
Logic-Low On
Logic-High On
Both devices use synchronous-rectified pulse-width modulation (PWM) boost technology to generate 2.5 to
5.0V outputs from a wide range of inputs, such as 1 to 3 alkaline/NiCd/NiMH cells or a single lithium-ion (Li+) cell. Automatic powersave operation significantly improves efficiency at light-loads.
! Up to 800mA Output
!
Constant-Frequency (1MHz) Operation
! Up to 96% Efficiency
! Input Range: 0.7 to 5.0V
! Fixed Output: 3.3V
!
Adjustable Output: 2.5 to 5.0V
! PWM Synchronous-Rectified Technology
! Logic-Controlled Shutdown: 0.1µA
!
! Adjustable Current Limit
still valid
!
Adjustable Soft-Start
Continuous switching mode is available for applications requiring constant-frequency operation at all load cur-
! 10-pin TDFN (3.0mm x 3.0mm) Package rents. PWM operation can also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.
(3.0mm x 3.0mm) package.
ams
The AS1326A/AS1326B are available in a 10-pin TDFN
3 Applications
The devices are ideal for digital cordless phones. mobile phones, wireless handsets, hand-held instruments,
content
Figure 1. AS1326 - Block Diagram
+
Undervoltage
Lockout
5
OUT
IC Power
2.15V
–
10
AS1326B only
ON
10
AS1326A only
ONN
2
REF
3
GND
6
On Rdy
Reference
Ref GND
Technical
CLK/SEL
4
1.25V
FB
1
ISET
AS1326
On
Startup
Osc
Q
D
Controller
En Osc
1MHz Osc
CLK/SEL Mode
En
Osc
Mode
FB ISET
9
POUT
8
LX
7
PGND www.austriamicrosystems.com
Revision 1.05
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AS1326
Datasheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
ISET 1 10 ONN/ON
REF 2 9 POUT
Pin Descriptions
Table 2. Pin Descriptions
Pin Number
1
2
3
4
5
6
Pin Name
ISET
REF
GND
FB
OUT
CLK/SEL
11
8 LX GND
FB
OUT
3
4
5
AS1326A/
AS1326B
7 PGND
6 CLK/SEL
still
N-Channel Current-Limit Control.
For maximum current limit, connect to pin REF.
To reduce current, supply a voltage between pin REF and GND using a resistive
valid
voltage-divider. If soft-start is desired, connect a capacitor from this pin to GND.
1.250V Internal Reference Bypass.
Connect a 10nF ceramic bypass capacitor to
GND. Up to 50µA of external load current is allowed.
Ground.
Connect this pin to PGND using a short trace. The exposed pad can be
ams
IC Power, Supplied from the Output.
Bypass this pin to GND with a 330nF ceramic capacitor, and connect to POUT with a 10
Ω
series resistor
.
Clock Input for the DC-DC Converter.
This pin is also used to program the operational mode as follows:
To set fixed output voltage of +3.3V, connect this pin to GND. For adjustable output of 2.5 to 5.0V, connect to a resistor-divider
0 = Normal operation – the AS1326A operates at a fixed frequency, and switches into automatic powersave operation if the load is minimized.
1 = Forced-PWM mode – the AS1326A operates in low-noise, constant-frequency mode at all loads.
Clocked = Forced-PWM mode with the internal oscillator synchronized to this pin in
500 to 1200kHz range.
7
8
PGND
LX
N-Channel Power MOSFET Switch Source
Inductor Connection
9
10
POUT
ONN
Power Output.
P-channel synchronous rectifier source.
Enable Low (AS1326A
only). Must be connected to GND for normal operation.
1 = The AS1326A is off.
Enable High (AS1326B
only). Must be connected to OUT for normal operation.
11
ON
NC
0 = The AS1326B is off.
1 = The AS1326B is on.
Exposed Pad.
This pad is not connected internally. It can be used for ground connection between GND and PGND.
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AS1326
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
may cause permanent damage to the device. These are stress ratings only,
device reliability.
Table 3. Absolute Maximum Ratings
Parameter
ON, ONN, OUT, CLK/SEL to GND
PGND to GND
REF, FB, ISET, POUT to GND
LX to PGND
POUT to OUT
Thermal Resistance
Θ
Operating Temperature Range
Storage Temperature Range
Junction Temperature
JA
Package Body Temperature
Min
-0.3
-0.3
-0.3
-0.3
-0.3
-40
-65
Max
7
+0.3
V
OUT
+
0.3
V
POUT
+
0.3
+0.3
33
+85
+150
+150
+260
Units Comments
V
V
V
V
V
ºC/W
ºC
ºC
ºC
ºC
AG
on PCB
still valid
Sensitivity Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin (100% Sn).
Technical
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AS1326
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, V
OUT
= 3.6V, T
AMB
= -40 to +85ºC. Typical values are at
T
AMB
= +25ºC. Unless otherwise specified.
Table 4. Electrical Characteristics
Condition Min Typ Max Unit Symbol
DC-DC Converter
Parameter
V
IN
0.7
5.0
V
Input Voltage Range
1
V
MINSU f
SU f
SW f
SWEXT
V
OUT
V
FB
I
FB
Minimum Startup Voltage
2
Temperature Coefficient of
Startup Voltage
Frequency in Startup Mode
Internal Oscillator Frequency
Oscillator Maximum
Duty Cycle
3
External Clock
Frequency Range
Output Voltage
FB Regulation Voltage
FB Input Leakage Current
I
LOAD
< 1mA, T
AMB
= +25ºC
V
OUT
= 1.5V
CLK/SEL = OUT
V
FB
AG
LX
< 0.55A
V
FB
= 1.35V, T
AMB
= +25ºC
125
0.8
80
0.5
3.17
0.9
86
3.3
1.215
1.240
1.270
-100 0.01
1.1
V
-1.6
500
1
1000
1.2
mV/°C
valid
%
V
OUTADJ
I
SHDN
Supply Current in Shutdown
No-Load Supply Current
5
2.5
-1 Load Regulation
Output Voltage
Adjust Range
Output Voltage
Lockout Threshold
4
ISET Input Leakage Current
CLK/SEL = OUT, no load to full load,
ams
V
ON
0 < I
LX
< 1.0A
Rising edge
V
ISET
= 1.25V, T
AMB
= +25ºC
CLK/SEL = GND
2.00
2.15
2.30
-50 0.01
0.1
65
50
5
100
5.0
90
100
MHz
V
V nA
%
V
V nA
µA
µA
No-Load Supply Current
5
,
Forced PWM Mode
CLK/SEL = OUT 2 mA
DC-DC Switches
POUT Leakage Current
LX Leakage Current
V
LX
= 0, V
OUT
= 5.5V, T
AMB
= +25ºC
V
LX
= V
OUT
= 5.5V, in shutdown,
T
AMB
= +25ºC
N-channel
0.1
0.1
10
10
µA
µA
R
ON
Switch On-Resistance
0.2
0.35
Ω
P-channel 0.25
0.45
1.6
1.95
I
NMOS
References
V
REF
N-Channel Current Limit
Reference Load Regulation
Reference Supply Rejection
I
REF
= 0
-1µA < I
REF
< +50µA
2.5V < V
OUT
< 5V
1.25
1.230
1.250
1.270
5
0.2
15
6
A
V mV mV www.austriamicrosystems.com
Revision 1.05
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AS1326
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Parameter Condition Min Typ Max Unit Symbol
Logic Inputs
CLK/SEL Input Low Level 2.5V
≤
V
OUT
≤
5.0V
V
0.2 x
V
OUT
CLK/SEL Input High Level 2.5V
≤
V
OUT
≤
5.0V
V
0.8 x
V
OUT
1.1V
≤
V
OUT
≤
1.8V
0.2
ON, ONN Input Low Level
6
0.4
V
1.8V
≤
V
OUT
≤
5.0V
Minimum CLK/SEL
Pulse Width
1.1V
≤
V
OUT
≤
1.8V
V
OUT
-
0.2
ON, ONN Input High Level
6
Input Leakage Current
1.8V
≤
V
OUT
≤
5.0V
CLK/SEL, ON, ONN, T
AMB
= +25ºC
1.6
0.1
200
1
Maximum CLK/SEL
Rise/Fall Time
100
1. Operating voltage; since the regulator is bootstrapped to the output, once started, the AS1326 operates down to
0.7V input. If CLK/SEL = GND then V
IN
≤
V
OUT
. If CLK/SEL = V
OUT
then V
IN
≤
0.75xV
OUT
.
2. Startup is tested with the circuit shown in
.
3. Defines maximum step-up ratio.
4. The regulator is in startup mode until this voltage is reached.
Caution
: Do not apply full load current until the device output > 2.3V.
ns
V
µA ns
valid
5. Supply current into pin OUT. This current correlates directly to the actual battery-supply current, but is reduced in value according to the step-up ratio and efficiency.
content
Technical
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AS1326
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
Circuit of
Figure 19 , VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.
Figure 3. Efficiency vs. Output Current, V
OUT
= 3.3V
100
Powersave Mode
VIN = 2.4V
90
80
VIN = 1.2V
70
60
50
40
30
20
10
0
0.1
Continuous Mode
1 10 100
Output Current (mA)
VIN = 0.9V
1000
Figure 4. Efficiency vs. Output Current, V
OUT
= 5.0V
100
90
Powersave Mode
VIN = 3.6V
80
VIN = 3.0V
70
60
50
40
30
20
VIN = 2.4V
Continuous Mode
valid
10
0
0.1
1 10
Output Current (mA)
Figure 5. Maximum Output Current vs. Input Voltage;
900 500
800
700
600
500
400
300
200
100
VOUT = 3.3V
400
VOUT = 5V
ams
300
200
content
0
VOUT = 5V
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Input Voltage (V)
0.5
1 1.5
2 2.5
3 3.5
4
Input Voltage (V)
1000
Figure 7. Internal Oscillator Frequency vs. Temp;
1.2
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
Technical
0.75
-40 -15 10 35
Temperature (°C)
60 85
Figure 8. Total Shutdown Current vs. Input Voltage
10
1
0.1
0.01
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Input Voltage (V) www.austriamicrosystems.com
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AS1326
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 9. Startup Voltage vs. Output Current
2.5
2
1.5
1
+85°C
0.5
1
-40°C
+25°C
10 100
Output Current (mA)
Figure 11. Light-Load Switching Waveform
I
OUT
= 10mA, CLK/SEL = OUT
1000
Figure 10. Peak Inductor Current vs. V
ISET
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0 0.2
0.4
0.6
0.8
1 1.2
1.4
V
ISET
(V)
Figure 12. Heavy-Load Switching Waveform
I
OUT
= 500mA
AG still valid ams
Figure 13. Line-Transient Response. V
IN
=2.4 to 1.4V,
content
Figure 14. Noise Spectrum
CLK/SEL = OUT
500ns/Div
I
OUT
= 200mA
500ns/Div
4
Technical
500ns/Div
2
1.5
1
0.5
3.5
3
2.5
0
0.2 1 10 20
Frequency (MHz) www.austriamicrosystems.com
Revision 1.05
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AS1326
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 15.
Load Transient Response
;
Automatic Powersave Mode, CLK/SEL = GND
Figure 16. Load Transient Response
Continuous Switching, CLK/SEL = OUT
0mA
100ms/Div
Figure 17. Turn-On Waveform
No Soft Start
0mA
ams
100ms/Div
Figure 18. Turn-On Waveform
Soft Start, R
SS
= 220k
Ω
,C
SS
= 100nF
AG still valid
2ms/Div
Parts used for measurments: 3.3µH (Coilcraft MOS6020-332ML) Inductor, 33µF (Panasonic EEFCD0K330R) C
IN
,
100µF (Panasonic EEFUD0J101R) C
OUT
Technical
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AS1326
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1326A/AS1326B are high-efficiency, low-noise DC-DC boost converters suitable as power supplies for portable devices. Both devices feature integrated boost switching regulator, N-channel power MOSFET, P-channel synchro-
nous rectifier, precision reference, and shutdown control circuitry (see Figure 1 on page 1)
.
The AS1326A/AS1326B are able to boost a 1- to 3-cell battery voltage input to a fixed 3.3V output, or adjustable output between 2.5 and 5.0V (an external Schottky diode is required for output voltages greater than 4V).
Table 5. Typical Output Voltages and Currents
# of NiCd/NiMh Cells Input Voltage (V) Output Voltage (V) Output Current (mA)
1
2
3
1.2
2.4
2.4
3.6
3.3
3.3
5.0
5.0
The integrated shutdown circuitry reduces device quiescent current down to 0.1µA.
Step-Up Converter
AG
335
800
450
800 turns off and inductor current flows through the synchronous rectifier to the output filter capacitor and the load. As the energy stored in the inductor is depleted, the current ramps down and the synchronous rectifier turns off.
valid
The devices are guaranteed to startup with an input voltage as low as 1.1V and remain operational down to an input of as little as 0.7V, and are optimized for use in mobile phones and other RF applications which have low noise and low quiescent current (extended battery life) requirements.
still
At light loads, the device operates at fixed-frequency or only as needed to maintain regulation, depending on the set-
ting of pin CLK/SEL (see Table 6)
.
Operational Modes
ams
as controlled by pin CLK/SEL (see page 2) .
Table 6. Operational Modes
content
Description CLK/SEL Setting Operational Mode
High-efficiency at all loads; Fixed-frequency (1MHz) at heavy and medium loads.
0 Normal
Fixed-frequency (1MHz), low-noise at all loads. V
IN
≤
0.75xV
OUT
1 Forced PWM
External 500kHz to
1.2MHz clock
Synchronized PWM Fixed-frequency, low-noise at all loads. V
IN
≤
0.75xV
OUT
Normal Operation
When CLK/SEL is pulled low, the devices are in normal operating mode. In normal mode the devices operate in PWM when driving medium-to-heavy loads, and automatically switches to automatic powersave mode if the load requires less power. The use of automatic powersave mode will boost the efficiency futhermore at light-load conditions.
Technical
to regulate the output voltage. Switching harmonics generated by fixed-frequency operation are consistent and can be filtered. See the Noise Spectrum plot in the Typical Operating Characteristics
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AS1326
Datasheet - D e t a i l e d D e s c r i p t i o n
Synchronized-PWM Operation
In PWM mode the AS1326A/AS1326B can be synchronized with an external clock (500kHz to 1.2MHz) by applying an external clock signal to pin CLK/SEL. This synchronization will minimize interference in wireless applications since the operating frequency can be set to a preferred value. The synchronous rectifier is active during synchronized-PWM operation.
Synchronous Rectifier
The AS1326A/AS1326B feature an integrated, P-channel synchronous rectifier for enhanced efficiency operation. Synchronous rectification provides 5% improved efficiency over similar non-synchronous boost regulators.
In PWM mode, the synchronous rectifier is turned on during the second half of each switching cycle. In low-power mode, an internal comparator turns on the synchronous rectifier when the voltage at LX exceeds the boost regulator output.
Note:
parallel with the P-channel synchronous rectifier.
valid
Low-Voltage Startup Oscillator
The AS1326A/AS1326B contain a CMOS, low-voltage startup oscillator for a 1.1V guaranteed minimum startup input voltage. At startup, the low-voltage oscillator switches on the N-channel MOSFET until the output voltage reaches
2.15V. With output voltages > 2.15V, the boost-converter feedback and control circuitry are acitvated.
When the AS1326A/AS1326B is in regulation, it can operate down to 0.7V input since internal power for the device is bootstrapped from the output through pin OUT.
Caution:
Do not apply full load until the output > 2.3V.
Shutdown
AG still
The AS1326A/AS1326B feature an integrated shutdown mode that reduces quiescent current to 0.1µA. During shutdown mode (ONN = 1 on AS1326A, ON = 0 on AS1326B), the internal reference and feedback/control circuitry are disabled.
Note: ams
Reference
nected between pins REF and GND. REF can source up to 50µA of external load current.
Note:
The bypass capacitor must be placed within 5mm (0.2”) of pin REF.
Technical
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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Figure 19. Typical AS1326A Application Circuit
V
IN
= 2.4V
33µF
+
10nF
3.3µH
8
LX
10
ONN
6
CLK/SEL
1
ISET
2
REF
4
FB
3
GND
7
PGND
Setting the Output Voltages
AS1326A
9
POUT
10
Ω
5
OUT
V
OUT
= 3.3V
800mA
100µF
330nF
+
still valid
resistor voltage-divider to pin FB from pin OUT to GND (
Figure 20. Application Circuit using External Feedback Resistors
V
IN
= 2.4V
33µF
+
3.3µH
6
CLK/SEL
1
content
5
OUT
10
Ω
ISET
2
REF
R
1
10nF
4
FB
3
R
2
GND
7
PGND
330nF
100µF
+
V
OUT
For the circuit shown in Figure 20
, the input bias current into FB is <20nA, permitting large-value resistor-divider networks while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a
≤
270k
Ω
Technical
R
1
=
R
2
⋅
⎛
⎝
V
OUT
1
V
FB
–
⎞
⎠
(EQ 1)
Where:
V
FB
(the boost-regulator feedback set point) is 1.24V.
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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Setting the Switch Current Limit
The ISET pin is used to adjust the inductor current limit and to implement the soft-start feature.
With pin ISET connected to pin REF, the inductor current limit is set to 1.6A. With ISET connected to a resistor-divider network from pin REF to GND, the current limit is calculated as:
I
LIMIT
=
1,6A
⋅
⎛
⎝
V
ISET
⎞
1,25V
⎠
(EQ 2)
Soft Start
capacitor between pin ISET and GND.
Figure 21. Circuit for Soft-Start with Maximum Switch Current Limit
valid
2
10nF
I
LIMIT
= 1.6A
t
SS
= Rss x C
SS
R
SS
≥
220k
Ω
C
SS
REF
1
ISET
AS1326A/
AS1326B
AG still
At power-up, ISET is 0V and the LX current is zero. As the capacitor voltage rises, the current increases and the output
Where:
R
SS
≥
220k
Ω
.
ams
(EQ 3)
t
SS
= R
SS
x C
SS
content
Note:
Placing a capacitor across the lower resistor of the current-limiting resistor-divider network enables both the current-limit and soft-start
.
Figure 22. Application Circuit for Soft-Start with Reduced Switch Current Limit
2
REF
10nF
R
SS
≥
220k
Ω
AS1326A/
AS1326B
1
ISET
R
SS2
I
LIMIT
= 1.6A
(
Rss
2
Rss
1 +
Rss
2
) t
SS
= (Rss
1
|| Rss
2
) C
SS www.austriamicrosystems.com
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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Inductor Selection
The AS1326A/AS1326B high switching-frequency allows the use of a small 3.3µH surface-mount inductor. The inductor should generally have a saturation current rating exceeding the N-channel switch current limit; however, it is acceptable to bias the inductor current into saturation by as much as 20% if a slight reduction in efficiency is acceptable.
core losses. To minimize radiated noise, use a toroid or shielded inductor. Connect the inductor from the battery to the pin LX as close to the device as possible.
Table 7. Recommended Inductors
Part Number
MOS6020-332
LPS4018-332
DO1608C-272
CDRH5D18NP-4R1N
96
94
92
90
L
3.3µH
3.3µH
2.7µH
4.1µH
DCR
46m
Ω
80m
Ω
80m
Ω
57m
Ω
Figure 23. Efficiency vs. I
OUT
; V
IN
= 2V, V
OUT
= 3.3V
Current Rating Dimensions (L/W/T)
1.8A
Manufacturer
6.8x6.0x2.4mm
Coilcraft www.coilcraft.com
valid
2.0A
4x4x1.8mm
2.1A
1.95A
96
94
92
90
88
6.6x4.45x2.92mm
AG
6x6x2mm
OUT
; V
IN
Sumida
still
88
86
84
82
80
78
MOS6020-332
DO1608C-272
ams
CDRH5D18NP-4R1N
LPS4018-332
86
84
82
80
78
76
74
72
MOS6020-332
DO1608C-272
CDRH5D18NP-4R1N
LPS4018-332
76
0.1
1 10 100
Output Current (mA)
1000
0.1
1 10 100
Output Current (mA)
1000
External Schottky Diode
For output voltages greater than 4V, an external Schottky diode must be connected between pin LX and POUT, in parallel with the integrated synchronous rectifier
(see Figure 25) . The diode should be rated for 0.5A. An external diode is
also recommended for applications that must start with input voltages at or below 1.8V. The Schottky diode carries current during startup and after the synchronous rectifier turns off; thus, its current rating only needs to be 500mA.
Note:
Connect the diode as close to the IC as possible.
For circuits that do not require startup with inputs below 1.8V and have an output of 4V or less, the external diode is not needed.
Caution:
Technical
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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Input and Output Filter Capacitors
Choose input and output filter capacitors that will service the input and output peak currents with acceptable voltage ripple. Choose input capacitors with voltage ratings greater than the maximum input voltage, and output capacitors with voltage ratings greater than the output voltage.
Table 8. Recommended Input Capacitor
Part Number C ESR
TPSC336K010R0150 33µF ±10% 150m
Ω
T495V336K010ATE100 33µF ±10% 100m
Ω
A700V226M006ATE028 22µF ±20% 28m
Ω
EEFCD0K330R 33µF ±20% 18m
Ω
Rated Voltage Dimensions (L/W/T)
10V
10V
6.3V
8V
6x3.2x2.6mm
7.3x4.3x2mm
7.3x4.3x2mm
7.3x4.3x1.8mm
Manufacturer
AVX Corp www.avxcorp.com
Kemet www.kemet.com
Panasonic www.panasonic.com
valid
Table 9. Recommended Output Capacitor
Part Number
TPSD107K010R0050
C
100µF
±10%
ESR
50m
Ω
T495D107M010ATE050
100µF
±20%
50m
Ω
A700V826M006ATE018 82µF ±20% 18m
Ω
EEFUD0J101R
100µF
±20%
15m
Ω
Rated Voltage Dimensions (L/W/T)
10V
10V
6.3V
AG
7.3x4.3x2.9mm
7.3x4.3x2.8mm
7.3x4.3x2mm
AVX Corp www.avxcorp.com
Kemet www.kemet.com
Panasonic www.panasonic.com
6.3V
7.3x4.3x2.8mm
Voltage Startup Assistance
V
IN
= 0.7V
to V
OUT
33µF
+
3.3µH
8
LX
10
ONN
6
CLK/SEL
1
ISET
2
REF
4
10nF
Technical
FB
3
GND
7
PGND
AS1326A
9
POUT
10
Ω
5
OUT
330nF
100µF
+
V
OUT =
3.3V
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AS1326
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
The input filter capacitor reduces peak currents drawn from the input source and also reduces input switching noise.
The input voltage source impedance determines the required value of the input capacitor. When operating directly from one or two NiMh cells placed close to the AS1326A/AS1326B, use a single 33µF low-ESR input filter capacitor.
Note:
With higher impedance batteries, such as alkaline and Li+, a higher value input capacitor may improve efficiency.
The output filter capacitor reduces output ripple voltage and provides the load with transient peak currents when necessary. For the output, a 100µF, low-equivalent series-resistance (ESR) capacitor is recommended for most applications.
Low-ESR tantalum capacitors offer a good trade-off between price and performance. Do not exceed the ripple current ratings of tantalum capacitors.
Note:
voltage.
Additional External Components
valid
Two ceramic bypass capacitors are required for proper device operation
:
!
!
Bypass pin REF to GND with a 10nF ceramic capacitor.
Bypass pin OUT to GND with a 330nF ceramic capacitor.
A 10
Ω
resistor is required between pin OUT and pin POUT (see Figure 25 on page 14) .
Note:
Layout Considerations
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High switching-frequencies and large peak currents of the AS1326A/AS1326B make PC board layout a critical part of design. Poor design may cause excessive EMI and ground bounce, both of which can cause instability or regulation errors by corrupting the voltage and current feedback signals.
!
!
!
!
Power components such as the inductor, converter IC, filter capacitors, and output diode should be placed as close
ams
Keep noisy traces, such as those from the pin LX, away from the voltage feedback network and guarded from them using grounded copper traces.
content
Technical
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Revision 1.05
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AS1326
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The devices are available in a 10-pin TDFN (3.0mm x 3.0mm) package.
Figure 26. 10-pin TDFN (3.0mm x 3.0mm) Package
D
SEE
DETAIL B
B
D2
D2/2
L
PIN 1 INDEX AREA
(D/2 xE/2)
Symbol
A
A1
A3
L1
L2 aaa bbb ccc ddd eee ggg
PIN 1 INDEX AREA
(D/2 xE/2) aaa C 2x
TOP VIEW e
N N-1
(ND-1) X e e BTM VIEW
Terminal Tip
Min
0.70
0.00
0.03
DETAIL B ccc C
0.08 C
AG
Datum A or B
ODD TERMINAL SIDE
Typ
0.75
0.02
0.20 REF
Max
0.80
0.05
0.15
0.13
ams
1, 2
1, 2
1, 2
1, 2
1, 2
D BSC
E BSC
θ
K
0º
0.20
3.00
3.00
0.40
0.15
0.10
Symbol Min Typ
b 0.18
0.25
0.10
1, 2
SIDE VIEW e 0.50
0.05
1, 2
N 10
0.08
1, 2
ND 5
0.10
1, 2
b bbb
Max
2.70
1.75
0.50
14º
0.30
C A B
PLANE
K
Notes
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2, 5
1, 2
1, 2, 5
C
valid
Notes:
1.
Figure 26 is shown for illustration only.
2. All dimensions are in millimeters; angles in degrees.
3. Dimensioning and tolerancing conform to
ASME Y14.5 M-1994
.
Technical
JEDEC 95-1, SPP-012
. Details of terminal #1 identifier are optional, but must be located within the zone indicated. The terminal #1 identifier may be either a mold or marked feature.
6. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip.
7. ND refers to the maximum number of terminals on side D.
8. Unilateral coplanarity zone applies to the exposed heat sink slug as well as the terminals www.austriamicrosystems.com
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AS1326
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 10
.
Table 10. Ordering Information
Ordering Code
AS1326A-BTDT
AS1326A-BTDR
Marking
ASLG
ASLG
Description
Active-Low, High-Current, 0.8A
DC-DC Step-Up Converter
Active-Low, High-Current 0.8A
DC-DC Step-Up Converter
Delivery Form
Tape & Reel
Tray
Package
10-pin TDFN
(3.0mm x 3.0mm)
10-pin TDFN
(3.0mm x 3.0mm)
Active-High, High-Current 0.8A
DC-DC Step-Up Converter
AS1326B-BTDT
AS1326B-BTDR
ASLH
ASLH
Active-High, High-Current 0.8A
DC-DC Step-Up Converter
Note:
All products are RoHS compliant and Pb-free.
Tape & Reel
Tray
10-pin TDFN
(3.0mm x 3.0mm)
10-pin TDFN
(3.0mm x 3.0mm)
valid
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
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Technical
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AS1326
Datasheet
Copyrights
Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by
valid
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to austriamicrosystems AG rendering of technical or other services.
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consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
Contact Information
Headquarters austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
Technical
http://www.austriamicrosystems.com/contact www.austriamicrosystems.com
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