SC4601
SC4601 is Step Down Controller manufactured by SEMTECH.
Description
The SC4601 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from input supply range 2.75V to 5.5V. A high level of integration reduces external ponent count and makes it suitable for low voltage applications where cost, size and efficiency are critical.
Features
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 bination 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 Ro HS pliant Distributed power architecture Servers/workstations Local microprocessor core power supplies DSP and I/O power supplies Battery powered applications Telemunication equipment Data processing applications
The SC4601 drives external plementary 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 protection 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 operation 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....
