AS1336 Dual Step-Up Converter IC

Description

The AS1336 is a dual synchronous, fixed frequency, very high-efficiency DC-DC boost converter capable of supplying guaranteed 75mA at 3.3V on each output from a 0.8V supply. Compact size and minimum external parts requirements make this device perfect for modern portable devices.High-speed switching frequency (1.2MHz) and internally compensated PWM current mode design enables efficiencies of up to 96% .With MODE pin automatic powersave or fixed frequeny operation can be selected for each regulator individually.The AS1336 can supervise the battery voltage and generate a low battery error flag. The device has integrated both MOSFET switches saving external components. Anti-ringing control circuitry reduces EMI by damping the inductor in discontinuous mode. The device features an extremely low shutdown current (< 2μA).The AS1336A offers shutdown disconnect while the AS1336B connects the battery directly to the output during shutdown enabling the supply of e.g. real-time-clocks, memories,...The AS1336 is available in a TQFN 3x3mm 16-pin package.

Key Features

• Input voltage 0.8V to 3.6V
• Output Range: 1.8V to 3.6V
• 96% Efficiency
• Delivers 145mA @ 3.3V (from 1.5V)
• Low Start-Up Voltage: 0.8V
• Switching Frequency: 1.2MHz
• Internal PMOS Synchronous Rectifier
• Fixed Frequency or Automatic Powersave Operation
• Battery feed through during Shutdown (AS1336A)
• Output Disconnect during Shutdown (AS1336B)
• Independent Enable
• Low Battery Detection
• TQFN 3x3mm 16-pin Package

Applications

The AS1336 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equipment, mice, pagers, digital cameras, remote wireless transmitters, MP3 players, LCD bias supplies, cordless phones, GPS receivers, and PC cards

Block Diagram