Overview

SC4901 is a unique secondary side regulator designed for implementing Semtech’s proprietary Combi-Sync topology for isolated convertors with multiple outputs. The Combi-Sync is a true all-MOSFET topology that allows synchronous rectification and post regulation of transformer isolated outputs, resulting in higher efficiency and low component count. Details of this unique topology are described in the Application Information section.

Packaging

TSSOP-16

Order Codes

SC4901ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only

PB Free/ROHS

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Features

Single controller performs synchronous rectification and post regulation
Independent regulation of multiple outputs from a common secondary winding
Turn-on shoot-through inherently eliminated
Primary switch turns ON and OFF with zero current
No synchronizing or any other signals needed across the isolation boundary
Eliminates the need for a secondary bias supply
Independent soft start, ON/OFF, remote sense and current limit for each output
Resistive or inductive current sensing with 2 V current signal and 2.5 V reference for external applications
4.5 V to 18 V operation
Max. operating frequency to 1 MHz
Low-profile 16-pin TSSOP package
Based on Semtech’s patent-pending Combi-Sync™ concept

Applications

Telecom isolated DC-to-DC converters with multiple low-voltage outputs
High-density brick and sub-brick modules with independently regulated multiple outputs
Distributed power architectures
Isolated VRMs