LT3957 Series

Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Catalog

Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Part	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Supplier Device Package	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Input (Min) [Min]	Output Configuration	Function	Voltage - Output (Max) [Max]	Topology	Current - Output	Package / Case	Number of Outputs	Mounting Type
Analog Devices LT3957EUHE#TRPBF	Adjustable	-40 °C	125 ¯C	1.6 V		36-QFN (5x6)	1 MHz	100 kHz	3 V	Positive or Negative	Step-Up Step-Up/Step-Down	40 V	Boost Cuk Flyback SEPIC	5 A	36-WFQFN 28 Leads Exposed Pad	1	Surface Mount
Analog Devices LT3957EUHE#PBF	Adjustable	-40 °C	125 ¯C	1.6 V		36-QFN (5x6)	1 MHz	100 kHz	3 V	Positive or Negative	Step-Up Step-Up/Step-Down	40 V	Boost Cuk Flyback SEPIC	5 A	36-WFQFN 28 Leads Exposed Pad	1	Surface Mount

Catalog

Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Key Features

• Wide Input Voltage Range: 3V to 40V

• Single Feedback Pin for Positive or Negative Output Voltage

• Internal 5A/40V Power Switch

• Current Mode Control Provides Excellent Transient Response

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

• Synchronizable to an External Clock

• Low Shutdown Current < 1μA

• Internal 5.2V Low Dropout Voltage Regulator

• Programmable Input Undervoltage Lockout with Hysteresis

• Programmable Soft-Start

• Thermally Enhanced QFN (5mm × 6mm) Package

Description

The LT3957 is a wide input range, current mode DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.The operating frequency of LT3957 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 minimum operating supply voltage of 3V, and a low shutdown quiescent current of less than 1μA, make the LT3957 ideally suited for battery-powered systems.The LT3957 features soft-start and frequency foldback functions to limit inductor current during start-up.FeaturesLT3957-LT3957AImproved Load Transient PerformanceApplicationsAutomotiveTelecomIndustrial