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SC2453 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2453 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  1 www.semtech.com SC2453 High Performance Quad Output Switching Regulator POWER MANAGEMENT Revision: July 20, 2005 Description Features Applications Typical Application Circuit Two synchronized converters for low noise Power up sequencing to prevent latch-up Out of phase operation for low input ripple Over current protection Wide input range, 4.5 to 30V Programmable frequency up to 700KHz Two synchronous bucks for high efficiency at high current One dedicated programmable positive linear regulator and one dedicated programmable negative linear regulator Output voltage as low as 0.5V Small package TSSOP-28. Also offered in lead free, WEEE and RoHS compliant package DSL applications with multiple input voltage re- quirements Mixed-Signal applications requiring positive and negative voltages Cable modem power management Base station power management The SC2453 is a high performance controller for multi- output converters that can be configured for a wide vari- ety of applications. The SC2453 utilizes PWM synchro- nous buck topologies where efficiency is most important. It also provides dedicated programmable positive and negative linear regulators using external transistors. Each of the three positive outputs is adjustable down to 0.5V. The two PWM switchers are synchronized 180° out of phase reducing input ripple, allowing for fewer input ca- pacitors. Power up sequencing prevents converter latch- up. The SC2453 can be synchronized to other converters to prevent beat frequencies. The wide range programmable operating frequency allows users to optimize a converter design. The PWM switchers sense the voltage across the low-side MOSFETs on-resistance to efficiently provide adjustable current-limit, eliminating costly current-sense resistors. A POK signal is issued when soft-start is com- plete on both PWM switchers and their outputs are within 10% of the set point. R8 C8 R14 R16 C1 R18 C5 C7 D1 Q1 C12 C3 R6 R5 C14 L2 C2 R17 Q4 D3 R11 C13 R7 Q6 C20 C10 C16 C15 C18 R4 C11 C19 C6 C17 C9 Q3 R3 Vout2: +3.3V Vout1: +5V Vout3: -12V Vout4: +2.5V R1 (as low as 0.5V) (as low as 0.5V) Vin: 4.5 - 30V To Vout2 To Vout2 Q7 R9 Q5 D2 L1 R10 Q2 GD1L 23 PH1 24 GD1H 25 EO2 12 BST1 26 POK 8 SYNC 7 EO1 3 GD2L 20 FB1 2 BD4 4 FB2 13 PH2 19 GD2H 18 BST2 17 FB4 5 BD3 11 FB3 10 SS/SHDN 6 OSC 9 SC 2453 R12 R15 R13 C4 |
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Similar Description - SC2453_05 |
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