SC4602B Datasheet | SEMTECH

Description The SC4602A/B is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 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. The SC4602A/B 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 MOSFET 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. Voltage drop across the Pchannel 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 soft start (2.4ms for the SC4602A and 1.2ms for the SC4602B) is internally provided to prevent output voltage overshoot during startup. A 100% maximum duty cycle allows the SC4602A/B to operate as a low dropout regulator in the event of a low battery condition. The SC4602A/B has fixed switching frequency (300KHz for the SC4602A and 550KHz for the SC4602B). The SC4602A/B is an ideal choice for 3.3V, 5V or other low input supply sytems. It’s available in a 8 pin MSOP package. SC4602A/B Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ BICMOS Voltage mode PWM controller 2.75V to 5.5V Input voltage range Output voltages as low as 0.8V +/-1% Reference accuracy Sleep Mode (Icc = 10µA typ) Lossless short circuit current limiting bination pulse by pulse & hiccup mode current limit High efficiency synchronous switching Up to 100% Duty cycle range Synchronization to external clock 8-Pin MSOP surface mount package. Lead-free package available, fully...