General Description

The AS1341 is a high-efficiency step-down converter with adjustable output voltages from 1.25V to VIN using supply voltages of up to 20V.

An integrated current-limited 0.4Ω MOSFET delivers load currents up to 600mA.

The AS1341 also includes a 100 duty cycle LDO mode with a low dropout of only 250mV for high efficiency if input voltages is in the range of the output voltage.

The AS1341 has a low quiescent current (12µA) to improve lightload efficiency and minimize battery use, and draws only 0.8µA in shutdown mode.

High switching frequencies (up to 200kHz) allow the use of small surface-mount inductors and output capacitors.

The device is available in a TDFN-8 3x3mm pin package.

Key Features

■ Output Voltages: Fixed 5V or Adjustable

■ Input Voltage Range: 4.5V to 20V

■ Output Current: Up to 600mA

■ 1.25V Lowest Output Voltage

■ Efficiency: up to 96

■ Quiescent Supply Current: 12µA

■ Power-OK Output

■ Internal 0.4Ω P-Channel MOSFET

■ Shutdown Current: 0.8µA

■ 100 Maximum Duty Cycle for Low Dropout

■ Current-Limited Architecture

■ Thermal Shutdown

■ TDFN-8 3x3mm Package

Applications

The device is ideal for notebook computers, distributed power systems, keep-alive supplies, and any other battery-operated, portable device.