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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2544 датащи(PDF) 1 Page - Semtech Corporation |
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SC2544 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 24 page  1 www.semtech.com SC2544 High Performance Wide Input Range Dual Synchronous Buck Controller POWER MANAGEMENT Revision: August 10, 2005 Description Features Typical Application Circuit Independent dual-outputs Wide input voltage range: 4.5V~28V Adjustable output voltage down to 0.75V Flexible power sequencing with enable and power good output Synchronous Buck topology with voltage mode control Out of phase operation to reduce cost of input capacitor 10V internal regulator for gate driver to deliver high efficiency Programmable switching frequency:100kHz~300kHz Full protection: UVLO, OVP and programmable OCP No need for current sense resistor Low shutdown current (100nA typical) 24 lead TSSOP and MLPQ packages Fully WEEE and RoHS Compliant Applications Systems with 4.5V~28V input LCDTV and PDPTV Network and telecom systems Portable devices Pinout shown as TSSOP-24. VIN+ VO2 FB2 VCC VIN+ VO1 FB1 VCC ENABLE VIN+ SC2544 1 2 3 4 5 6 7 8 9 10 11 24 23 22 21 20 19 18 16 14 13 12 15 17 VIN VCC EN FB1 ERROUT1 SS1 ILIM1 BST1 DRVH1 PHASE1 DRVL1 AGND ROSC PWRGD FB2 ERROUT2 SS2 ILIM2 DRVH2 DRVL2 PVCC PGND PHASE2 BST2 PWGRD FB1 VO1 FB2 The SC2544 is a high performance dual PWM controller. It is designed to convert a wide ranged input voltage down to two independent output rails. The PWM operations of the two channels are 180 degree out of phase which can greatly reduce the size and the cost of the input capacitors. Synchronous Buck PWM topology and volt- age mode control allow high efficiency operation, fast transient responses, and flexible component selection for easy designs. A 10V internal linear regulator pro- vides the bias for the controller, and this voltage is opti- mized for gate drivers to deliver high efficiency. The power sequencing is fully supported including independent start up, and power good output. In the shut down mode the controller only draws 100nA from the supply. The con- troller also offers full protection features for the condi- tions of under voltage, over voltage, and the over cur- rent. There is no need for a current sensing resistor because the MOSFET on resistance is used for the sens- ing element. The switching frequency is adjustable from 100 kHz to 300 kHz. Two packages TSSOP-24 and MLPQ- 24 are offered. |
Аналогичный номер детали - SC2544 |
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Аналогичное описание - SC2544 |
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