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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SC2677B 데이터시트(PDF) 1 Page - Semtech Corporation |
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SC2677B 데이터시트(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  POWER MANAGEMENT 1 www.semtech.com SC2677B Dual Synchronous Voltage Mode Controller with Current Sharing Circuitry Features Revision: Dec. 04, 2009 The SC2677B is a versatile 2 phase, synchronous, voltage mode PWM controller that can be used in two distinct ways. First, the SC2677B is ideal for applications where point of use output power exceeds any single input power budget. Alternatively, the SC2677B can be configured as a dual switcher. The SC2677B features a precise temperature compensated voltage reference, cycle-by-cycle peak cur- rent limit, under voltage lockout over current protection, and internal level-shifted high-side gate drive circuitry. In current sharing configuration, the SC2677B can pro- duce a single output voltage from two separate input volt- age sources (which can be different in voltage levels) while maintaining current sharing between the two channels. Current sharing is programmable to allow each input sup- ply to be loaded differently per application requirements. In dual switcher configuration, two feedback paths are pro- vided for independent control of the separate outputs. The device will provide a regulated output from flexibly config- ured inputs, such as 3.3V, 5V, 12V etc. The phasing be- tween the two switchers is adjustable to minimize the in- put and output ripple. 300kHz to 1MHz externally programmable frequency operation Soft Start and Enable function Power Good output provided Cycle-by-cycle peak current limit Latch off for over current protection Phase-shifted switchers minimize ripple High efficiency operation, >90% Programmable output(s) as low as 0.5V Industrial temperature range TSSOP-24 package TSSOP-24 EDP package Bias voltage as low as 4.5V Adjustable phase shift between channels Two Phase, Current Sharing Controller Flexible, same or separate V IN Programmable current sharing Thermal distribution via multi-phase output Graphics cards Peripheral add-in card Dual-Phase power supply Power supplies requiring two outputs CS1+ CS2+ C6 M5 C62 D1 CS1+ R20 C39 R49 R5 C63 M7 PW RGD Vout2 R48 R21 D3 D2 C4 C25 M3 C38 CS2- CS2- R8 L1 1 2 D4 C36 C23 C19 CS1- L2 1 2 U1 SC2677B C26 R18 R19 C57 CS1- R50 Vin R10 C28 ENABLE C33 Vout1 CS2+ R13 M1 R14 C43 C59 R51 Dual Independent outputs Typical Application Schematic Description Applications |
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