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SC1175CSW.TR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1175CSW.TR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  POWER MANAGEMENT 1 www.semtech.com SC1175 Low Power Dual Synchronous DC/DC Controller With Current Sharing Circuitry Description Features Applications Revision: September 22, 2004 The SC1175 is a versatile 2 phase, synchronous, volt- age mode PWM controller that may be used in two dis- tinct ways. First, the SC1175 is ideal for applications where point of use output power exceeds any single in- put power budget. Alternatively, the SC1175 can be used as a dual switcher. The SC1175 features a temperature compensated voltage reference, over current protection with 50% fold-back and internal level-shifted, high-side drive circuitry. In current sharing configuration, the SC1175 can pro- duce a single output voltage from two separate voltage sources (which can be different voltage levels) while maintaining current sharing between the channels. Cur- rent sharing is programmable to allow loading each input supply as required by the application. In dual switcher configuration, two feedback paths are provided for independent control of the separate out- puts. The device will provide a regulated output from flexibly configured inputs (3.3V, 5V, 12V), provided 5V is present for V CC. The two switchers are 180° out of phase to minimize input and output ripple. 300kHz fixed frequency operation Soft Start and Enable function Power Good output provided Over current protection with 50% fold-back Phase-shifted switchers minimize ripple High efficiency operation, >90% Programmable output(s) as low as 1.25V Industrial temperature range 20 pin SOIC or TSSOP package Two Phase, Current Sharing Controller Flexible, same or separate V IN Programmable current sharing Combined current limit with fold-back 2 phases operating opposed for ripple reduction Thermal distribution via multi-phase output Two Independent PWM Controllers Flexible, same or separate V IN Independent control for each channel Independent and separate current limit 2 phases operating opposed for ripple reduction (if same V IN used) Graphics cards DDR Memory Peripheral add-in card SSTL Termination Dual-Phase power supply Power supplies requiring two outputs |
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