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SC4601 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4601 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 www.semtech.com SC4601 Low Input, High Efficiency Synchronous, Step Down Controller POWER MANAGEMENT Revision: February 22, 2006 Description Features Applications Typical Application Circuit Programmable switching frequency up to 600KHz BICMOS voltage mode PWM controller 2.75V to 5.5V Input voltage range Output voltage as low as 0.8V +/-1% Reference accuracy Sleep mode (Icc = 10µA typ) Lossless adjustable overcurrent protection Combination pulse by pulse & hiccup mode current limit High efficiency synchronous switching Up to 100% Duty cycle range Synchronization to external clock 10-Pin MSOP surface mount package. Available in 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 Telecommunication equipment Data processing applications The SC4601 is a voltage mode step down (buck) regula- tor controller that provides accurate high efficiency power conversion from input supply range 2.75V 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 SC4601 drives external complementary power MOSFETs; P-channel on the high side and N-channel on the low side. The use of high side P-channel MOSFETs eliminates the need for an external charge pump and simplifies the high side gate driver. Non-overlap protec- tion is provided for the gate drive signals to prevent shoot through of the MOSFET pair. The voltage drop across the P-channel MOSFET during its conduction is sensed for lossless short circuit current limiting. A low power sleep mode can be achieved by forcing the SYNC/SLEEP pin below 0.8V. A synchronous mode of op- eration is activated as the SYNC/SLEEP pin is driven by an external clock. The quiescent supply current in sleep mode is typically lower than 10µA. A 2.4ms soft start is internally provided to prevent output voltage overshoot during start-up. A 100% maximum duty cycle allows the SC4601 to operate as a low dropout regulator in the event of a low battery condition. Its switching frequency can be programmed up to 600KHz. The SC4601 is an ideal choice for 3.3V, 5V or other low input supply systems. It’s available in 10 pin MSOP package. VCC 1 SYNC 2 COMP 3 VSENSE 4 FS 5 ISET 6 PHASE 7 GND 8 NDRV 9 PDRV 10 U1 SC4601 R15 1 C3 4.7u C7 150u C14 33n R6 1.0 R5 1.0 R9 5.11k Vout = 1.5V (as low as 0.5V * ) /6A M2 C10 22u C11 22u C12 22u Vin = 2.75V ~ 5.5V C13 22u C4 22u RT 30.1K C1 470p C2 6.8n R1 5.11K R3 L1 1.6u C9 3.9n R8 147 M1 R7 4.53k * External components can be modified to provide a V OUT as low as 0.8V. |
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