SC4603

Very Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Description The SC4603 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from input supply range 2.25V 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 SC4603 drives external complementary power MOSFETs; P-channel on the high side and N-channel on www.DataSheet4U.com 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 1.7ms soft start is internally provided to prevent output voltage overshoot during start-up. A 100% maximum duty cycle allows the SC4603 to operate as a low dropout regulator in the event of a low battery condition. The SC4603 is an ideal choice for 3.3V, 5V or other low input supply systems. It’s available in 10 pin MSOP package. SC4603...