AS1341 Step-Down Converter IC

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 package.

Key Features

• Input Voltage Range: 4.5 to 20V
• Output Voltages: Fixed 5V or Adjustable 1.25V to Vin
• Output Current: Up to 600mA
• 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.

Block Diagram