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SC4608 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4608 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 19 page  1 www.semtech.com SC4608 Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Revision: June 19, 2006 Description Features Applications Typical Application Circuit Asynchronous start up Programmable switching frequency up to 1MHz BiCMOS voltage mode PWM controller 2.7V to 5.5V input voltage range Output voltage as low as 0.5V +/-1% reference accuracy Sleep mode (Icc = 1µA max) Adjustable lossless short circuit current limiting Combination pulse by pulse & hiccup mode current limit High efficiency synchronous switching 1A peak current driver External soft start Power good signal 16-pin MLP Lead-free package. This product is fully WEEE and RoHS compliant Distributed power architecture Servers/workstations Local microprocessor core power supplies DSP and I/O power supplies Battery-powered applications Telecommunications equipment Data processing applications The SC4608 is a voltage mode step down (buck) regula- tor controller that provides accurate high efficiency power conversion from an input supply range of 2.7V to 5.5V. A high level of integration reduces external component count, and makes it suitable for low voltage applications where cost, size and efficiency are critical. The SC4608 is capable of producing an output voltage as low as 0.5V. It’s frequency of operation is programmable to 1MHz. The SC4608 drives external, N-channel MOSFETs with a peak gate current of 1A. A non-overlap protection is pro- vided for the gate drive signals to prevent shoot through of the MOSFET pair. The SC4608 features lossless cur- rent sensing of the voltage drop across the drain to source resistance of the high side MOSFET during its conduction period. The quiescent supply current in sleep mode is typically lower than 1µA. A external soft start is provided to pre- vent output voltage overshoot during start-up. The SC4608 is an ideal choice for converting 3.3V, 5V or other low input supply voltages. It’s available in 16 pin MLP package. R3 C3 1u C2 2.2n R1 14.3k C1 180p V out= 0.5V / 12A C17 1u D2 L1 1.8u C5 22u C4 22u M11 C10 220u M2 C9 4.7n R8 200 R7 10k V in=3V – 3.6V R6 1 R5 1 C16 560pF AVDD 1 ISET 2 COMP 3 FSET 4 PVDD 16 BST 15 PHASE 12 SS 7 VSENSE 8 DRVH 13 PGOOD 6 EN 5 AGND 9 PGND 10 DRVL 11 SC4608 R2 10k C6 330u C13 22u C14 22u R13 1 22n Css R3 C3 1u C2 2.2n R1 14.3k C1 180p V out= 0.5V / 12A C17 1u D2 L1 1.8u C5 22u C4 22u M11 C10 220u M2 C9 4.7n R8 200 R7 10k V in=3V – 3.6V R6 1 R5 1 C16 560pF AVDD 1 ISET 2 COMP 3 FSET 4 PVDD 16 BST 15 PHASE 12 SS 7 VSENSE 8 DRVH 13 PGOOD 6 EN 5 AGND 9 PGND 10 DRVL 11 SC4608 R2 10k C6 330u C13 22u C14 22u R13 1 22n Css |
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