SC4609
SC4609 is High Efficiency Synchronous Buck manufactured by SEMTECH.
Low Input, MHz Operation, High Efficiency Synchronous Buck
POWER MANAGEMENT Description
The SC4609 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 2.7V 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 SC4609 is capable of producing an output voltage as low as 0.5V.
Features
Asynchronous start up Programmable switching frequency up to 1MHz Bi CMOS voltage mode PWM controller 2.7V to 5.5V input voltage range Output voltage 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 1A peak current driver External soft start 12-pin MLP 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 Telemunications equipment Data processing applications
The SC4609 drives external, N-channel MOSFETs with a .. peak gate current of 1A. A non-overlap protection is pro- vided for the gate drive signals to prevent shoot through of the MOSFET pair. The SC4609 Features lossless current sensing of the voltage drop across the drain to source resistance of the high side MOSFET during its conduction period. Its switching frequency can be programmed up to 1MHz. The quiescent supply current in sleep mode is typically lower than 10µA. A external soft start is provided to prevent output voltage overshoot during start-up.
Applications
The SC4609 is an ideal choice for converting 3.3V, 5V or other low input supply voltages. It’s available in 12 pin MLP package.
Typical Application Circuit
Vin=2.7V
- 5.5V
C10 D2 220u 1u...
