FEATURES

n Wide Input Voltage Range: 2.9V to 40V

n Positive or Negative Output Voltage Programming

with a Single Feedback Pin

n Current Mode Control Provides Excellent Transient

Response

n Programmable Operating Frequency (100kHz to

1MHz) with One External Resistor

n Synchronizable to an External Clock

n Low Shutdown Current < 1µA

n Internal 7.2V Low Dropout Voltage Regulator

n Programmable Input Undervoltage Lockout with

Hysteresis

n Programmable Soft-Start

n Small 10-Lead DFN (3mm × 3mm) and Thermally

Enhanced 10-Pin MSOP Packages

n AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

n Automotive and Industrial Boost, Flyback, SEPIC and

Inverting Converters

n Telecom Power Supplies

n Portable Electronic Equipment

DESCRIPTION

The LT®3757/LT3757A are wide input range, current

mode, DC/DC controllers which are capable of generating

either positive or negative output voltages. They can be

configured as either a boost, flyback, SEPIC or inverting

converter. The LT3757/LT3757A drive a low side external

N-channel power MOSFET from an internal regulated 7.2V

supply. The fixed frequency, current-mode architecture

results in stable operation over a wide range of supply

and output voltages.

The operating frequency of LT3757/LT3757A can be set

with an external resistor over a 100kHz to 1MHz range,

and can be synchronized to an external clock using the

SYNC pin. A low minimum operating supply voltage of

2.9V, and a low shutdown quiescent current of less than

1µA, make the LT3757/LT3757A ideally suited for batteryoperated systems.

The LT3757/LT3757A feature soft-start and frequency

foldback functions to limit inductor current during startup and output short-circuit. The LT3757A has improved

load transient performance compared to the LT3757.