AS1324 Step-Down Converter IC

Description

The AS1324 is a high-efficiency, constant-frequency synchronous buck converter available in adjustable and fixed voltage versions. The wide input voltage range (2.7V to 5.5V), automatic powersave mode and minimal external component requirements make the AS1324 perfect for any single Li-Ion battery-powered application.

Typical supply current with no load is 30μA and decreases to ≤1μA in shutdown mode. The highly efficient duty cycle (100%) provides low dropout operation, prolonging battery life in portable systems.

The AS1324 is available as the standard versions listed:

An internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The internally fixed switching frequency (1.5MHz) allows for the use of small surface mount external components.

Very low output voltages can be delivered with the internal 0.6V feedback reference voltage.

The AS1324 is available in a 5-pin TSOT-23 package.

Key Features

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 0.6 to 5.5V
• Output Current: 600mA
• High Efficiency: Up to 96%
• Constant Frequency Operation: 1.5MHz
• No Schottky Diode Required
• Automatic Powersave Operation
• Low Dropout Operation: 100% Duty Cycle
• Low Quiescent Current: 30μA
• Internal Reference: 0.6V
• Shutdown Mode Supply Current: ≤1μA
• Thermal Protection
• TSOT-23 5-pin Package

Applications

The device is ideal for mobile communication devices, laptops and PDAs, ultra-low-power systems, threshold detectors/discriminators, telemetry and remote systems, medical instruments, or any other space-limited application with low power-consumption requirements.

Block Diagram