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 light-load 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 pack

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.