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LTC3406AB-2 - 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

The LTC3406AB-2 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current with no load is 200µA and drops to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406AB-2 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.

Switching frequency is internally set at 2.25MHz, 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 LTC3406AB-2 is available in a low profile (1mm) ThinSOT package. Refer to LTC3406A for applications that require Burst Mode operation.

Features High Efficiency: Up to 96% 600mA Output Current 2.5V to 5.5V Input Voltage Range 2.25MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle ±2% Output Voltage Accuracy Low Quiescent Current: 200µA 0.6V Reference Allows Low Output Voltages Shutdown Mode Draws <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 Personal Navigation Devices Wireless and DSL Modems Digital Still Cameras Media Players Portable Instruments Packaging

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