The LTC3703 is a synchronous step-down switching regulator controller from LTC company that can directly step down voltages up to 100V, making it ideal for telecom and automotive applications. The LTC3703 uses a constant frequency (up to 600kHz), voltage mode architecture to drive external N-channel MOSFETs. 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 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.
The LTC3703 controller provides a flexible solution for telecom, automotive and industrial power supplies, supporting input voltages up to 100 V and delivering up to 5 A output current. It features large 1 Ω gate drivers, a programmable constant‑frequency oscillator (100 kHz‑600 kHz), and a precise 1 % reference.
The device includes programmable current limit, undervoltage lockout, pulse‑skip mode, and a low shutdown current of 50 µA, making it suitable for noise‑sensitive applications. Detailed electrical characteristics, pin descriptions, and typical performance graphs are provided.
| Maximum Input Voltage | 100 V |
|---|---|
| Programmable Frequency Range | 100 kHz – 600 kHz |
| Gate Driver Resistance | 1 Ω |
| Reference Accuracy | ±1 % |
| Shutdown Current | 50 µA |
The LTC3703 can operate with input voltages up to 100 V.
The operating frequency is programmable from 100 kHz to 600 kHz.
The device has a low shutdown current of 50 µA.
It provides a reference accuracy of ±1 %.