LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller

describe

The LT ^® 3758 is a wide input voltage range, current mode, DC/DC controller that can generate positive or negative output voltages. It can be configured as a boost, flyback, SEPIC or inverting converter. The LT3758 drives a low side external N-channel power MOSFET from an internal 7.2V regulated supply. The fixed frequency, current mode architecture enables stable operation over a wide range of supply and output voltages.

The LT3758's operating frequency can be set with an external resistor (programmable from 100kHz to 1MHz) and can be synchronized to an external clock using the SYNC pin. A 5.5V minimum operating supply voltage and a low shutdown quiescent current (<1μA) make the LT3758 ideal for battery-powered systems.

The LT3758 features soft-start and frequency foldback to limit inductor current during startup and output short circuit.

Features

Wide input voltage range: 5.5V to 100V

Single feedback pin to set positive or negative output voltage

Current mode control provides excellent transient response

Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor

Can be synchronized to an external clock

Low shutdown current: <1μA

Internal 7.2V low dropout regulator

Programmable input undervoltage lockout with hysteresis

Programmable soft start

Small form factor 10-pin DFN (3mm x 3mm) and MSOPE packages

Encapsulation

Typical Applications