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.

Key Features

95% Efficiency

Single-Cell Operation

Delivers 150mA @ 3.3V (from Single AA Cell)

Delivers 500mA @ 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 (AS1322A)

Continuous Switching at Light Loads (AS1322B)

Anti-Ringing Control Minimizes EMI

Logic Controlled Shutdown (< 1µA)

Output Range: 2.5 to 5.0V

6-pin TSOT-23 Package

Applications

The AS1322 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equip ment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, MP3 players, LCD bias supplies, cordless phones, GPS receivers, and PC cards.