LT8357 Series

60V 2MHz Low-IQBoost, SEPIC and Flyback Controller

Catalog

60V 2MHz Low-IQBoost, SEPIC and Flyback Controller

Part	Voltage - Input [Min]	Voltage - Input [Max]	Voltage - Output	Outputs and Type	Outputs and Type	Regulator Topology	Frequency - Switching	Utilized IC / Part	Board Type	Main Purpose	Supplied Contents	Output Configuration	Supplier Device Package	Mounting Type	Number of Outputs	Package / Case	Package / Case	Duty Cycle (Max)	Operating Temperature [Max]	Operating Temperature [Min]	Control Features	Output Phases	Topology	Output Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Function	Clock Sync	Synchronous Rectifier	Frequency - Switching [Min]	Frequency - Switching [Max]
Analog Devices EVAL-LT8357-AZ	4.5 V	20 V	24 V	Non-Isolated	1	Boost	200 kHz	LT8357	Fully Populated	DC/DC Step Up	Board(s)
Analog Devices LT8357JMSE#PBF												Positive	12-MSOP-EP	Surface Mount	1	12-TSSOP Exposed Pad	0.118 in 3 mm	95 %	150 °C	-40 °C	Current Limit Enable Frequency Control Power Good Soft Start	1	Boost Flyback SEPIC	Transistor Driver	60 V	3 V	Step-Up Step-Up/Step-Down			100 kHz	2 MHz

Catalog

60V 2MHz Low-IQBoost, SEPIC and Flyback Controller

Key Features

• Wide Input Voltage Range: 3V to 60V

• Low IQBurst Mode®Operation: 8μA

• Up to 95% Efficiency at 2MHz

• ±1.5% Internal 1V Voltage Reference

• 5V Split Gate Drive for Efficiency and EMI Optimization

• 100kHz to 2MHz Fixed Switching Frequency with External Clock Synchronization

• Spread Spectrum Frequency Modulation for Low EMI

• Accurate Enable Threshold with Hysteresis

• Programmable Output Soft-Start and Tracking

• Thermally-Enhanced 12-Lead MSOP Package

Description

The LT8357 is a wide input range, current mode, DC/DC controller which can be configured as a boost, SEPIC or flyback converter. The LT8357 drives a low side N-channel power MOSFET with 5V split gate drive. The current mode architecture allows adjustable and synchronizable 100kHz to 2MHz fixed frequency operation, or internal 19% triangle spread spectrum operation for low EMI. At light load, either pulse-skipping mode or low-ripple Burst Mode operation can be selected. Additional features include output power good and output short circuit protection in SEPIC and flyback configurations.With a wide 3V to 60V input voltage range and 8μA low quiescent current, the LT8357 provides a simple, compact and efficient solution for automotive, industrial, and battery-powered systems.APPLICATIONSAutomotive and Industrial SystemsBattery-Powered SystemsPortable Electronic Equipment