AS1329 Step-Up Converter IC
DC-DC Step-Up Converter Low Voltage, 1.2 MHz
Description
The AS1329A, AS1329B and the AS1329C are synchronous, fixed frequency, very high-efficiency DC-DC boost converters capable of supplying 3.3V at 160mA 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:
| Model |
Light Load Switching |
| AS1329A |
Powersave Operation (medium loads) |
| AS1329B |
Powersave Operation (light loads) |
| AS1329C |
Continuous Switching |
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 directly to the output enabling the supply of real-time-clocks.
The AS1329 is available in a 6-pin TSOT-23 package.
Key Features
- Input Voltage: 0.65 to 5.0V
- Output Range: 2.5 to 5.0V
- Delivers 160mA @ 3.3V (from Single AA Cell)
- Delivers 570mA @ 3.3V (from Two AA Cells)
- 95% Efficiency
- Fixed-Frequency: 1.2MHz
- Internal PMOS Synchronous Rectifier
- Automatic Powersave Operation (AS1322A&B)
- Fixed Frequency Opertation (AS1322C)
- Anti-Ringing Control Minimizes EMI
- Logic Controlled Shutdown (< 1μA)
- 6-pin TSOT-23 Package
Applications
The AS1329 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.
AS1301
5V/50mA Inductorless Boost
AS1302
5V/30mA Inductorless Boost
AS1320
3.3V, 200mA, Hyst. Boost
AS1321
5.0V/130mA, Hyst. Boost
AS1322
Adj., 315mA, 1.2 MHz, Boost
AS1323
1.6µA Iq, Single Cell, Boost
AS1325
3.3/5V, 300/185mA, Hyst. Boost
AS1326
Adj. 650mA, 1MHz, Boost
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4MHz DCDC Step-up
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AS1337 DCDC Step-up Converter
AS1340
50V, 100mA, 1MHz, Boost
AS1343
42V, 1MHz, Single Cell, Boost
AS1344
42V DCDC for OLED



