説明

The AS1337 is a synchronous, fixed frequency, high efficiency DC-DC boost converter capable of supplying 3.3V at 200mA from two AA Cells. Compact size and minimum external parts requirements make these devices perfect for modern portable devices.

The AS1337 offers automatic powersave mode to increase efficiency at light loads. For input voltages higher than VOUT, the AS1337 will switch in a step down mode so that a Buck Boost function is realized.

The AS1337A offers a shutdown mode where the battery is connected directly to the output enabling the supply of real-time-clocks or memories.The AS1337 offers a POK (open-drain) feature which detects output power fail of 10%.

The AS1337 is available in a TDFN (3x3mm) 8-pin package.

主な機能

• Input Voltage Range: 0.65V to 4.5V
• Output Voltage Range: 2.5V to 5.0V
• Delivers 200mA @ 3.3V (from two AA Cell)
• Up to 97% Efficiency
• High-Speed Fixed-Frequency: 1.2MHz
• Internal PMOS Synchronous Rectifier
• Automatic Powersave Operation
• Shutdown Current < 1μA
• TDFN (3x3mm) 8-pin Package

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The AS1337 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.

Block diagram for AS1337 Buck-Boost Converter IC