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A S1 3 2 2
L o w Vo lt a g e, M i c ro p o w e r, D C- DC St ep - U p C o n v e r te r s
1 General Description
The AS1322A and the AS1322B are synchronous, fixed frequency,
very high-efficiency DC-DC boost converters capable of supplying
3.3V at 150mA from a single AA-supply. Compact size and minimum
external parts requirements make these devices perfect for modern
portable devices.
High-speed switching frequency (1.2MHz) and internally
compensated PWM current mode design provide highly-reliable DC-
DC conversion, especially when driving white LEDs.
The converters are available as the standard products listed in Table
1 .
Table 1. Standard Products
2 Key Features
95% Efficiency
Single-Cell Operation
Delivers 160mA @ 3.3V (from Single AA Cell)
Delivers 220mA @ 5.0V (from Two AA Cells)
Delivers 570mA @ 3.3V (from Two AA Cells)
Low Start-Up Voltage: 0.85V
High-Speed Fixed-Frequency: 1.2MHz
Model
AS1322A
AS1322B
Light Load Switching
Automatic Powersave Operation
Continuous Switching
Internal PMOS Synchronous Rectifier
Automatic Powersave Operation (AS1322A)
Continuous Switching at Light Loads (AS1322B)
The devices contain two internal MOSFET switches: one NMOS
switch and one PMOS synchronous rectifier.
Anti-ringing control circuitry reduces EMI by damping the inductor in
discontinuous mode, and the devices exhibit extremely low
quiescent current (< 1μA) in shutdown.
In shutdown mode the battery is connected to the output and V OUT
is held at approximately V IN - 0.6V.
The AS1322 is available in a 6-pin TSOT-23 package.
Figure 1. Typical Application Diagram – Single Cell to 3.3V
Synchronous Boost Converter
L1
4.7μH
1
SW
Anti-Ringing Control Minimizes EMI
Logic Controlled Shutdown (< 1μA)
Output Range: 2.5 to 5.0V
6-pin TSOT-23 Package
3 Applications
The AS1322 is ideal for low-power applications where ultra-small
size is critical as in medical diagnostic equipment, hand-held
instruments, pagers, digital cameras, remote wireless transmitters,
MP3 players, LCD bias supplies, cordless phones, GPS receivers,
and PC cards.
AA Battery
C 1
10μF
6
V IN
AS1322
5
V OUT
R 1
1.02M ?
1%
C 2
10μF
V OUT
3.3V
160mA
On
Off
4
SHDNN
3
FB
www.ams.com/DC-DC_Step-Up/AS1322
2
GND
Revision 1.10
R 2
604k ?
1%
1 - 18
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