LTC3901 Datasheet | Linear Technology

LTC3901 Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters Features - - - - - - - - DESCRIPTIO U APPLICATIO S - - - - - N-Channel Synchronous MOSFET Driver Programmable Timeout Reverse Inductor Current Sense Gate Drive Transformer Synchronization Sequence Monitor Wide VCC Supply Range: 4.5V to 11V 15ns Rise/Fall Times at VCC = 5V, CL = 4700p F Undervoltage Lockout Small 16-Lead SSOP Package The LTC®3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and fullbridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformergenerated bipolar input to maintain sychronization 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. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 48V Input Isolated DC/DC Converters Isolated Tele Power Supplies Distributed Power Step-Down Converters Industrial Control System Power Supplies Automotive and Heavy Equipment TYPICAL APPLICATIO L1 ISOLATION BARRIER T1 VIN 36V TO 72V CSE + MA MB ME ME CSE - DRVA DRVB LTC3723 PUSH-PULL CONTROLLER P VFB SDRA SDRB GND VCC LTC3901 CSF + PVCC MF MF CSF - SYNC T2 OUT FB LT4430 OR LT1431 OPTOCOUPLER DRIVER P 3901 F01 PGND TIMER Figure 1. Simplified Isolated Push-Pull Converter 3901f + COUT VOUT 12V ABSOLUTE (Note 1) AXI U RATI GS U W U PACKAGE/ORDER I FOR...