Datasheet

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Data sheet
AS1337
2 0 0 m A , D C - D C St e p - U p C o n v e r t e r w i t h B u c k M o d e
1 General Description
2 Key Features
Low Start-Up Voltage: 0.85V
Output Voltage Range: 2.5V to 5.0V
Delivers 200mA @ 3.3V (from two AA Cell)
up to 97% Efficiency
The AS1337A offers a shutdown mode where the battery is
connected directly to the output enabling the supply of realtime-clocks or memories.
Single-Cell Operation
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Internal PMOS Synchronous Rectifier
In the shutdown mode of the AS1337B the battery is disconnected and the output is discharged.
Table 1. Standard Products
Model
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High-Speed Fixed-Frequency: 1.2MHz
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Input Voltage Range: 0.65V to 4.5V
The AS1337 is a synchronous, fixed frequency, highefficiency
DC-DC boost converter capable of supplying 3.3V @ 200mA
from two AA Cells. Compact size and minimum external parts
requirements make these devices perfect for modern portable
devices. The AS1337 offers automatic powersave mode to
increase efficiency at light loads. For input voltages higher
than VOUT the AS1337 will switch in a step down mode, so
that a Buck Boost function is realized.
Automatic Powersave Operation
Anti-Ringing Control Minimizes EMI
Logic Controlled Shutdown (< 1µA)
Operation Mode
TDFN (3x3mm) 8-pin Package
AS1337A
Battery Connected in Shutdown
AS1337B
Battery Disconnected in Shutdown and
Output Discharged
3 Applications
The AS1337 offers a POK (open-drain) feature which detects
output power fail of 10%.
The AS1337 is ideal for low-power applications where ultrasmall size is critical as in medical diagnostic equipment, handheld instruments, pagers, digital cameras, remote wireless
transmitters, MP3 players, LCD bias supplies, cordless
phones, GPS receivers, and PC cards.
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The AS1337 is available in a TDFN (3x3mm) 8-pin package.
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3.6V
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Figure 1. AS1337 - Typical Application Diagram – Dual Cell to 3.3V Synchronous Boost Converter
Buck Mode
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2x AA Cell Range
VOUT=3.3V
VIN Curve
L1
4.7µH
VOUT
LX
VIN = 2xAA
1.6V to 3.6V
VIN
CIN
10µF
Boost Mode
VOUT = 3.3V
On
Off
EN
GND
AS1337
COUT
22µF
FB
POK
PGND
1.6V
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AS1337
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
8 FB
LX 2
7 VIN
AS1337
PGND 3
9 GND
5 EN
Pin Descriptions
Table 2. Pin Descriptions
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GND 4
6 POK
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VOUT 1
Pin Name
Pin Number
VOUT
1
2
LX
PGND
GND
5
EN
6
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POK
8
9
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GND
7
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VIN
FB
3
4
Description
Output Voltage. Bias is derived from VOUT when VOUT exceeds VIN. PCB trace length from
VOUT to the output filter capacitor(s) should be as short and wide as is practical.
Switch Pin. Connect an inductor between this pin and VIN. Keep the PCB trace lengths as short
and wide as is practical to reduce EMI and voltage overshoot. If the inductor current falls to zero,
or pin EN is low, an internal 100Ω anti-ringing switch is connected from this pin to VIN to minimize
EMI.
Note: An optional Schottky diode can be connected between this pin and VOUT.
Power Ground. Provide a short, direct PCB path between this pin and the output capacitor(s).
Ground
Enable Pin. Logic controlled enable input.
1 = Normal operation
0 = Shutdown
Note: In a typical application, EN should be connected to VIN through a 1MΩ
pull-up resistor.
POK. High when VOUT is within regulation.
Input Voltage. The AS1337 gets its start-up bias from VIN unless VOUT exceeds VIN, in which
case the bias is derived from VOUT. Thus, once started, operation is completely independent
from VIN. Operation is only limited by the output power level and the internal series resistance of
the supply.
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to this pin.
The output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.23V[1 + (R1/R2)]
Exposed Pad Ground
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AS1337
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 Table 3 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Section 6 Electrical Characteristics on page 4 is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 3. Absolute Maximum Ratings
Max
Units
VIN to GND
-0.3
5.5
V
FB to GND
-0.3
5
V
All other pins to GND
-0.3
6
V
Input Current (latch-up immunity)
-100
100
mA
Norm: JEDEC 78
kV
Norm: MIL 883 E method 3015
Electrical Parameters
Electrostatic Discharge
Human Body Model
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2
Notes
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Min
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Parameter
Temperature Ranges and Storage Conditions
Storage Temperature Range
-55
+150
Package Body Temperature
Humidity non-condensing
+260
ºC
85
%
1
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
Represents a max. floor life time of unlimited
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Moisture Sensitive Level
5
ºC
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AS1337
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
VIN = VEN = +1.2V, VOUT = +3.3V, Typ values @ TAMB = +25ºC (unless otherwise specified);
Table 4. Electrical Characteristics
TAMB
Parameter
Conditions
Operating Temperature Range
Min
Typ
-45
Input
ILOAD = 1mA
Minimum Operating Voltage
EN = VIN
0.85
0.85
V
4.5
V
5
V
1.268
V
nA
1
0.65
VFB
Feedback Voltage
IFB
Feedback Input Current
1.192
VFB = 1.25V
Quiescent Current
VFB = 1.4V
ISHDN
Shutdown Current
EN = GND, VIN = 3.3V
20
35
µA
0.01
1
µA
0.01
1
µA
AS1337B only
0.01
1
µA
VOUT = 3.3V
0.35
VOUT = 5V
0.20
VOUT = 3.3V
0.45
VOUT = 5V
0.30
INMOSSWL NMOS Switch Leakage
IPMOSSWL PMOS Switch Leakage
RONNMOS NMOS Switch On Resistance
RONPMOS PMOS Switch On Resistance
NMOS Current Limit
Max Duty Cycle
fSW
IEN
Ω
mA
80
87
%
0.95
1.2
1.5
0.3
MHz
V
EN Input Current
EN = 5.0V
0.01
1
µA
POK Voltage Low
IPOK=1mA
0.1
0.4
V
POK Leakage Current
VPOK = VIN or VOUT
1
100
nA
Power-OK Threshold
Falling Edge
88
91
%
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Power-OK
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VIL
Ω
850
1
Enable Input Threshold
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VIH
VFB = 1V
Switching Frequency
Shutdown
1.23
1
2
IQPWS
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2.5
Regulation
INMOS
°C
V
Output Voltage Adjust Range
Switches
+85
1.15
Maximum Input Voltage
Operating Current
Units
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VIN
Minimum Start-Up Voltage
Max
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Symbol
86
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Thermal Protection
TENM
ΔTENM
Overtemperature Protection
145
ºC
Overtemperature Protection Hysteresis
10
ºC
1. Minimum VIN operation after start-up is only limited by the battery’s ability to provide the necessary power as it enters a deeply discharged state.
2. IQPWS is measured at VOUT. Multiply this value by VOUT/VIN to get the equivalent input (battery) current.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
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AS1337
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
VOUT = 3.3V, CIN = 10µF, COUT = 22µF, L1 = 4.7µH, TAMB = +25°C (unless otherwise specified).
100
90
90
80
80
60
50
70
60
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70
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Figure 4. Efficiency vs. IOUT - Step-up Mode
100
Efficiency (%)
Efficiency (%)
Figure 3. Efficiency vs. IOUT - Down Conversion Mode
50
Vin = 1.5V
Vin = 3.5V
40
Vin = 4.0V
30
Vin = 2.0V
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40
Vin = 3.0V
30
0.1
1
10
100
1000
0.1
1
Output Current (mA)
Figure 5. Efficiency vs. Input Voltage
100
1000
Figure 6. Output Current vs. Input Voltage
70
60
Output Current (mA)
80
Iout = 1mA
50
Iout = 10mA
Iout = 30mA
40
400
300
200
100
Iout = 100mA
Iout = 200mA
30
0.5
1.0
1.5
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Efficiency (%)
100
500
90
2.0
2.5
3.0
3.5
4.0
0
4.5
0.5
1
1.5
Input Voltage (V)
Switching Frequency (MHz)
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0.65
0.55
0.45
0
15
30
45
3
3.5
4
4.5
75
90
1.5
0.75
0.35
-45 -30 -15
2.5
Figure 8. Switching Frequency vs. Temperature
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0.85
2
Input Voltage (V)
Figure 7. Min. Operating Voltage vs. Temperature
Minimum Operating Voltage (V)
10
Output Current (mA)
60
75
90
1.4
1.3
1.2
1.1
1
0.9
-45 -30 -15
Temperature (°C)
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0
15
30
45
60
Temperature (°C)
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AS1337
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. Output Voltage vs. Temp.; ILOAD = 1mA
Figure 10. Load Transient Response; VIN = 1.8V
3.5
100mV/Div
VOUT
3.4
3.35
100mA
3.25
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3.3
IOUT
10mA
3.2
15
30
45
60
75
90
1ms/Div
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10mA
IOUT
100mA
VOUT
IOUT
VOUT
Figure 12. Load Transient Response; VIN = 3.6V
100mV/Div
Figure 11. Load Transient Response; VIN = 3.0V
1ms/Div
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1ms/Div
100mV/Div
0
Temperature (°C)
100mA
3.1
-45 -30 -15
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3.15
10mA
Output Voltage (V)
3.45
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1337 can operate from a single-cell input voltage (VIN) below 1V, and features fixed frequency (1.2MHz) and current mode PWM control
for exceptional line- and load-regulation. With low RDS(ON) and gate charge internal NMOS and PMOS switches, the device maintains high-efficiency from light to heavy loads.
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Modern portable devices frequently spend extended time in low-power or standby modes, switching to high power-drain only when certain functions are enabled. The AS1337 is ideal for portable devices since it maintains high-power conversion efficiency over a wide output power range,
thus increasing battery life in these types of applications.
In addition to high-efficiency at moderate and heavy loads, the AS1337 includes an automatic powersave mode that improves efficiency of the
power converter at light loads. The powersave mode is initiated if the output load current falls below a factory programmed threshold.
The Overtemperature protection circuitry turn-off both switches for a short time when the temperature reaches 145ºC in the device .
L1
4.7µH
POK
1.5V
Single
Cell
7
VIN
CIN
1µF
2 LX
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6
Start Up
OSC
A
B
PWM
Control
1.2MHz
Ramp
Generator
Σ
Slope
Compensator
+
PWM –
Comp
–
EN
Shutdown
Control
Powersave
Operation
Control
3.3V
Output
VOUT
0.45Ω
0.35Ω
CFF*
Current
Sense
8
–
gm Error
Amp
+
R1
560kΩ
COUT
4.7µF
FB
CP2
2.5pF
1.23V
Ref
R2
330kΩ
AS1337
4 GND
3 PGND
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* Optional
RC
80kΩ
CC
150pF
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Powersave
Shutdown
2.3V
–
VOUT
Good
+
A/B
MUX
Sync Drive
Control
5
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Figure 13. AS1337 - Block Diagram
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
Low-Voltage Start-Up and Soft Start
The AS1337 requires a VIN of only 0.85V (typ) or higher to start up. The low-voltage start-up circuitry controls the internal switches and provides
a soft start function, where the inductor current during start up is limited for a certain time. This soft start and in rush current limitation feature provides also a smooth curve of VOUT after start up and makes the overshoot of VOUT minimal. To achieve this, a 100pF capacitor as CFF is
needed (see Figure 13 on page 7) to speed up the feedback loop.
Low-Noise Fixed-Frequency Operation
Oscillator
The AS1337 switching frequency is internally fixed at 1.2MHz allowing the use of very small external components.
Current Sensing
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After a certain time a bigger inductor current is allowed and the soft start is disabled.
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A signal representing the internal NMOS-switch current is summed with the slope compensator. The summed signal is compared to the error
amplifier output to provide a peak current control command for the PWM. Peak switch current is limited to approximately 850mA independent of
VIN or VOUT.
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Zero Current Comparator
The zero current comparator monitors the inductor current to the output and shuts off the PMOS synchronous rectifier once this current drops to
20mA (approx.). This prevents the inductor current from reversing polarity and results in improved converter efficiency at light loads.
Anti-Ringing Control
Anti-ringing control circuitry prevents high-frequency ringing on pin LX as the inductor current approaches zero. This is accomplished by damping the resonant circuit formed by the inductor and the capacitance on pin LX.
Setting Output Voltage
A voltage divider from VOUT to GND programs the output voltage from 2.5V to 5V via pin FB as:
VOUT = 1.23V(1 + (R1/R2))
(EQ 1)
Powersave Operation
In light load conditions, the integrated powersave feature removes power from all circuitry not required to monitor VOUT. When VOUT has
dropped approximately 1% from nominal, the AS1337 powers up and begins normal PWM operation.
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COUT (see Figure 13 on page 7) recharges, causing the AS1337 to re-enter powersave mode as long as the output load remains below the powersave threshold. The frequency of this intermittent PWM is proportional to load current; i.e., as the load current drops further below the powersave threshold, the AS1337 turns on less frequently. When the load current increases above the powersave threshold, the AS1337 will resume
continuous, seamless PWM operation.
Buck Mode
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Note: An optional capacitor (CFF) between pins VOUT and FB in some applications can reduce VOUTp-p ripple and input quiescent current
during powersave mode. Typical values for CFF range from 15pF to 220pF.
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Both devices, the AS1337A and the AS1337B, offer a low power buck mode for VIN > VOUT operation. The switching during buck mode is similar to boost mode, but with forced reduction of some energy internal to be able to provide a buck conversion.
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Shutdown
When pin EN is low the AS1337 is switched off and <1µA current is drawn from battery; when pin EN is high the device is switched on. If EN is
driven from a logic-level output, the logic high-level (on) should be referenced to VOUT to avoid intermittently switching the device on.
Note: If pin EN is not used, it should be connected directly to pin VOUT.
Caution: Because of the feedthrough the output voltage is the same as the input voltage during shutdown. If VIN >
VOUT the output voltage will jump to the value of the input voltage when the device switches into shutdown.
During normal operation the device is in down conversion mode.
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
Shutdown Battery Feedthrough (AS1337A)
In shutdown the battery input of the AS1337A is connected to the output through the inductor and the small internal synchronous rectifier P-FET.
This allows the input battery to provide backup power for devices such as an idle microcontroller, memory, or real-time-clock, without the usual
diode forward drop. In this way a separate backup battery is not needed.
Shutdown Battery Disconnect (AS1337B)
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The AS1337B is designed to allow true output disconnect by opening both P-channel MOSFET rectifiers. During Shutdown VOUT is discharged
via the internal NMOS transistor and connected to GND.
POK Function
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The POK output indicates if the output voltage is within 88% (typ.) of the nominal voltage level. As long as the output voltage is within regulation
the open-drain POK output is high impedance. The POK output can be tied to VIN or to VOUT or to any external voltage up to VIN or VOUT via a
pull-up resistance (see Figure 1 on page 1). If the output voltage drops below 88% (typ.) of the nominal voltage the POK pin is pulled to GND.
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Note: It is important to consider that in shutdown mode the POK output is pulled to VIN in order to save current.
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AS1337
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
The AS1337 is perfectly suited for LED matrix displays, bar-graph displays, instrument-panel meters, dot matrix displays, set-top boxes, white
goods, professional audio equipment, medical equipment, industrial controllers to name a few applications.
Along with Figure 1 on page 1, Figure 14 and Figure 15 depict a few of the many applications for which the AS1337 converters are perfectly
suited.
L1
4.7µH
VOUT = 3.3V
VOUT
R1
560kΩ
FB
R2
330kΩ
VIN = 1.5V
VIN
On
Off
AS1337
EN
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POK
COUT
22µF
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LX
CIN
10µF
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Figure 14. Single AA Cell to 3.3V Synchronous Boost Converter
GND
PGND
Figure 15. Single Lithium Cell to 5V
L1
4.7µH
VOUT = 5.0V
LX
Lithium-Ionen Cell
CIN
10µF
VIN
On
Off
EN
R1
680kΩ
FB
R2
220kΩ
AS1337
COUT
22µF
POK
PGND
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GND
VOUT
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AS1337
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Component Selection
Only three power components are required to complete the design of the buck-boost converter, except the additional two resistors for the voltage
divider to set VOUT. The high operating frequency and low peak currents of the AS1337 allow the use of low value, low profile inductors and tiny
external ceramic capacitors.
Inductor Selection
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The inductor should have low ESR to reduce the I²R power losses, and must be able to handle the peak inductor current without saturating.
High-frequency ferrite core inductor materials reduce frequency dependent power losses compared to less expensive powdered iron types,
which result in improved converter efficiency.
A 4.7µH to 15µH inductor value with a >850mA current rating and low DCR is recommended. For applications where radiated noise is a concern, a toroidal or shielded inductor can be used.
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Capacitor Selection
A 10µF capacitor is recommend for CIN as well as a 22µF for COUT. Small-sized ceramic capacitors are recommended. X5R and X7R ceramic
capacitors are recommend as they retain capacitance over wide ranges of voltages and temperatures.
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Output Capacitor Selection
Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since they have extremely low
ESR and are available in small footprints. A 1 to 10µF output capacitor is sufficient for most applications. Larger values up to 22µF may be used
to obtain extremely low output voltage ripple and improve transient response.
An additional phase lead capacitor may be required with output capacitors larger than 10µF to maintain acceptable phase margin. X5R and X7R
dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are recommended for input decoupling and should be located as close to the device as is practical. A 4.7µF input capacitor is sufficient for most applications. Larger values may be used without limitations.
Table 5. Recommended External Components
Name
Part Number
Value
Rating
Type
Size
Manufacturer
CIN
GRM219R60J106KE19
10µF
6.3V
X5R
0805
COUT
GRM21BR60J226ME39
22µF
6.3V
X5R
0805
Murata
www.murata.com
L1
MOS6020-472ML
4.7µH
1.82A
50mΩ
6.8x6.0x2.4mm
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Coilcraft
www.coilcraft.com
PCB Layout Guidelines
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The high-speed operation of the AS1337 requires proper layout for optimum performance.
A large ground pin copper area will help to lower the device temperature.
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A multi-layer board with a separate ground plane is recommended.
Traces carrying large currents should be direct.
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Trace area at pin FB should be as small as is practical.
The lead-length to the battery should be as short as is practical.
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AS1337
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
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Figure 16. TDFN (3x3mm) 8-pin Marking
YY
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Table 6. Packaging Code YYWWIZZ
Q
ZZ
plant identifier
free choice / traceability code
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last two digits of the current year
WW
manufacturing week
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AS1337
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
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Figure 17. TDFN (3x3mm) 8-pin Package
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AS1337
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products listed in Table 7.
Table 7. Ordering Information
Marking
Descriptiom
Delivery Form
Package
AS1337A-BTDT
ASSE
200mA, DC-DC Step-Up Converter with Buck Mode;
Battery Connect in Shutdown
Tape and Reel
TDFN (3x3mm) 8-pin
AS1337B-BTDT
ASSF
200mA, DC-DC Step-Up Converter with Buck Mode;
Battery Disconnect in Shutdown and Output Discharged
Tape and Reel
TDFN (3x3mm) 8-pin
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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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Note: All products are RoHS compliant and Pb-free.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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www.austriamicrosystems.com/DC-DC_Step-Up/AS1337
Revision 1.05
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AS1337
Datasheet
Copyrights
Copyright © 1997-2010, 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.
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Disclaimer
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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 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.
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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 personal injury, property damage, loss of profits, loss of use,
interruption of business or indirect, special, incidental or 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
austriamicrosystems AG rendering of technical or other services.
Headquarters
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Contact Information
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austriamicrosystems AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
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Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com/DC-DC_Step-Up/AS1337
Revision 1.05
15 - 15
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