SC4607
SC4607 is High Efficiency Synchronous Buck manufactured by SEMTECH.
Description
The SC4607 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 2.25V to 5.5V. The SC4607 is capable of producing an output voltage as low as 0.5V and has a maximum duty cycle of 97%. A high level of integration reduces external ponent count, and makes it suitable for low voltage applications where cost, size, and efficiency are critical.
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Features
Asynchronous start up Bi CMOS voltage mode PWM controller Operation of frequency to 1MHz 2.25V to 5.5V input voltage range Output voltages as low as 0.5V +/-1% reference accuracy Sleep mode (Icc = 10µA typ) Adjustable lossless short circuit current limiting bination pulse by pulse & hiccup mode current limit High efficiency synchronous switching Up to 97% duty cycle 1A peak current driver 10-pin MSOP package
The SC4607 drives external, N-channel MOSFETs with a peak gate current of 1A. The SC4607 prevents shoot through currents by offering nonoverlap protection for the gate drive signals of the external MOSFETs. The SC4607 Features lossless current 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 10µA. A 1.2ms soft start is internally provided to prevent output voltage overshoot during start-up.
Applications
Distributed power architecture Servers/workstations Local microprocessor core power supplies DSP and I/O power supplies Battery-powered applications Telemunications equipment Data processing applications
The SC4607 is an ideal choice for converting 2.5V, 3.3V, 5V or other low input supply voltages. It’s available in 10 pin MSOP package
Typical Application Circuit
Vin = 2.25V
- 5.5V
D2 R13 1 1 C3 4.7u 2 3 4 C1 180p R1 14.3k C2 2.2n C20 560p F 5 C10 1u C71 R6 U1 BST VCC ISET P FS/SYNC DRVH PHASE DRVL GND VSENSE 10 9 8 7 6 R5 0 M2...
