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LTC3901 - Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters

Datasheet

Documentation

Features

N-Channel Synchronous MOSFET Driver
Programmable Timeout
Reverse Inductor Current Sense
Gate Drive Transformer Synchronization Sequence Monitor
Wide V_CC Supply Range: 4.5V to 11V
15ns Rise/Fall Times at V_CC = 5V, C_L = 4700pF
Undervoltage Lockout
Small 16-Lead SSOP Package

Typical Application

Description

The LTC3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and full-bridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformer generated bipolar input to maintain synchronization with the primary side controller.

The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect.

Packaging

SSOP-16

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LTC3901EGN#PBF	SSOP	16	E	$3.75	$2.60
LTC3901EGN#TRPBF	SSOP	16	E		$2.66
LTC3901EGN	SSOP	16	E	$7.50	$5.20
LTC3901EGN#TR	SSOP	16	E		$5.32

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.