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 1Ω 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.

LTC3703-5

LTC3703

Maximum VIN

60V

100V

MOSFET Gate Drive

4.5V to 15V

9.3V to 15V

VCC UV+

3.7V

8.7V

VCC UV–

3.1V

6.2V

Applications

* 48V Telecom and Base Station Power Supplies

* Networking Equipment, Servers

* Automotive and Industrial Control

* High Voltage Operation: Up to 60V

* Large 1Ω 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