LTC3633A-1

FEATURES n 3.6V to 20V Input Voltage Range n 3A Output Current per Channel n Up to 95% Efficiency n Low Duty Cycle Operation: 5% at 2.25MHz n Selectable 0°/180° Phase Shift Between Channels n Adjustable Switching Frequency: 500kHz to 4MHz n External Frequency Synchronization n Current Mode Operation for Excellent Line and Load Transient Response n 0.6V Reference Allows Low Output Voltages n User Selectable Burst Mode® Operation or Forced Continuous Mode Operation n Output Voltage Tracking and Soft-Start Capability n Short-Circuit Protected n Overvoltage Input and Overtemperature Protection n Power Good Status Outputs n LTC3633: 16V Absolute Maximum VIN n LTC3633A: 20V Absolute Maximum VIN, Pin Compatible with LTC3633 n Low Profile (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages APPLICATIONS n Distributed Power Systems n Battery Powered Instruments n Point of Load Power Supplies LTC3633A/LTC3633A-1 Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator DESCRIPTION The LTC®3633A is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase to relax the requirements for input and output capacitance. The operating supply voltage range is from 3.6V to 20V, making it suitable for lithium-ion battery stacks as well as point of load power supply applications from a 12V or 5V supply. The operating frequency is programmable from 5...