LTC3407-2 - Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

Linear Technologies

The LTC3407-2 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1.2mm. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power switches provide high efficiency without the need for external Schottky diodes.

A user selectable mode input is provided to allow the user to trade-off noise ripple for low power efficiency. Burst Mode® operation provides high efficiency at light loads, while Pulse Skip Mode provides low noise ripple at light loads.

To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40µA. In shutdown, the device draws <1µA.

Iout Fsw Features LTC3407 2x 600mA 1.5MHz LTC3407-2 2x 800mA 2.25MHz LTC3407-3 2x 800mA 2.25MHz Fixed 1.8V/3.3V LTC3407-4 2x 800mA 2.25MHz Reduced POR Delay LTC3407A 2x 600mA 1.5MHz Low Ripple Burst Mode LTC3407A-2 2x 800mA 2.25MHz Low Ripple Burst Mode

* High Efficiency: Up to 95% * Very Low Quiescent Current: Only 40µA * 2.25MHz Constant Frequency Operation * High Switch Current: 1.2A on Each Channel * No Schottky Diodes Required * Low RDS(ON) Internal Switches: 0.35Ω * Current Mode Operation for Excellent Line and Load Transient Response * Short-Circuit Protected * Low Dropout Operation: 100% Duty Cycle * Ultralow Shutdown Current: IQ < 1µA * Output Voltages from 5V down to 0.6V * Power-On Reset Output * Externally Synchronizable Oscillator * Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

Designed for Automotive and Transportation Applications AEC-Q100 generic family data available for specific packages

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