General 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.

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

■ Internal PMOS Synchronous Rectifier

■ Automatic Powersave Operation (AS1329A&B)

■ Continuous Switching at Light Loads (AS1329C)

■ Anti-Ringing Control Minimizes EMI

■ Logic Controlled Shutdown (< 1µA)

■ Output Range: 2.5 to 5.0V

■ 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.