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 for AS1336 Dual Step-Up Converter IC