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SC4609EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4609EVB Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 18 page 1 www.semtech.com SC4609 Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Revision: February 8, 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 = 10µA typ) 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 12-pin MLP Lead-free package, 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 SC4609 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 SC4609 is capable of producing an output voltage as low as 0.5V. The SC4609 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 SC4609 features lossless cur- rent sensing of the voltage drop across the drain to source resistance of the high side MOSFET during its conduction period. Its switching frequency can be pro- grammed up to 1MHz. The quiescent supply current in sleep mode is typically lower than 10µA. A external soft start is provided to pre- vent output voltage overshoot during start-up. The SC4609 is an ideal choice for converting 3.3V, 5V or other low input supply voltages. It’s available in 12 pin MLP package. R3 C3 4.7u C2 2.2n R1 14.3k C1 180p D2 L1 1.8u C5 22u C4 22u Vout=1.5V (as low as 0.5V*) / 12A C17 1u M11 C10 220u M2 C9 4.7n R8 200 R7 10k R9 4.99k Vin=2.7V - 5.5V R6 1 R5 1 C16 560pF VCC 1 ISET 2 COMP 3 FSET 4 BST 12 DRVH 11 DRVL 9 AGND 7 PGND 8 PHASE 10 SS 6 VSENSE 5 U1 SC4609 C6 330u C13 22u C14 22u R13 1 Css 22u *External components can be modified to provide a Vout as low as 0.5V R3 C3 4.7u C2 2.2n R1 14.3k C1 180p D2 L1 1.8u C5 22u C4 22u Vout=1.5V (as low as 0.5V*) / 12A C17 1u M11 C10 220u M2 C9 4.7n R8 200 R7 10k R9 4.99k Vin=2.7V - 5.5V R6 1 R5 1 C16 560pF VCC 1 ISET 2 COMP 3 FSET 4 BST 12 DRVH 11 DRVL 9 AGND 7 PGND 8 PHASE 10 SS 6 VSENSE 5 U1 SC4609 C6 330u C13 22u C14 22u R13 1 Css 22u *External components can be modified to provide a Vout as low as 0.5V |
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