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LTC3703-5 - 60V Synchronous Switching Regulator Controller

The LTC3703-5 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 60V, making it ideal for telecom and automotive applications. The LTC3703-5 drives external logic level N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture.

A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented* line feed forward compensation provide very fast line and load transient response. Strong 1W gate drivers allow the LTC3703-5 to drive multiple MOSFETs for higher current applications. The operating frequency is user programmable from 100kHz to 600kHz and can also be synchronized to an external clock for noise-sensitive applications. Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. For applications requiring up to 100V operation, refer to the LTC3703 data sheet.

Features High Voltage Operation: Up to 60V Large 1 Ohm Gate Drivers (with 5V Supply) No Current Sense Resistor Required Step-Up or Step-Down DC/DC Converter Dual N-Channel MOSFET Synchronous Drive Excellent Line and Load Transient Response Programmable Constant Frequency: 100kHz to 600kHz ±1% Reference Accuracy Synchronizable up to 600kHz Selectable Pulse Skip Mode Operation Low Shutdown Current: 25µA Typ Programmable Current Limit Undervoltage Lockout Programmable Soft-Start 16-Pin Narrow SSOP and 28-Pin SSOP Packages Typical Application

Applications 48V Telecom and Base Station Power Supplies Networking Equipment, Servers Automotive and Industrial Control Packaging

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