5.5V/3A, 1.2MHz Sync. Step-dow Converter

AS1309

The AS1309 is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.7V to 5.5V input voltage range makes the AS1309 ideally suited for single Li-lon battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage.

The AS1309 is available in a low profile SOT23-5L package.

Features

 Input Voltage Range: 2.7V to 5.5V

 Fixed Switching Frequency: 1.2MHz

 Continuous Output Current: 3A

 High Efficiency: Up to 96%

 Output Adjustable from 0.6V

 No Schottky Diode Required

 Built-in Short Protection

 Built-in Over Current Limit

 Built-in Over Voltage Protection

 PFM Mode for High Efficiency in Light Load

 Over Temperature Protected.

 Low Quiescent Current: 40uA

 Internal Soft-Start

 -40°C to 85°C Operation Temperature

 Available in SOT23-5L Package

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