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LTC3406A - 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

The LTC3406A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20µA, dropping to =1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406A ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime portable systems. Automatic Burst Mode operation increases efficiency at light loads, further extending battery runtime.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The LTC3406A is available in a low profile (1mm) ThinSOT package.

Features High Efficiency: Up to 96% Very Low Quiescent Current: Only 20µA Low Output Ripple Voltage During Burst Mode Operation 600mA Output Current 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle ±2% 0.6V Reference Shutdown Mode Draw =1µA Supply Current Internal Soft-Start Limits Inrush Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected Low Profile (1mm) ThinSOT Package Typical Application

Applications Cellular Telephones Wireless and DSL Modems Digital Still Cameras Media Players Portable Instruments Point of Load Regulation Packaging

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