SC1470

www.DataSheet4U.com Synchronous Buck Power Supply Controller POWER MANAGEMENT Description The SC1470 is a single output, constant on-time synchronous-buck, pseudo fixed frequency, PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and fast dynamic response with no minimum on time. The excellent transient response means that SC1470 based solutions will require less output capacitance than competing fixed frequency converters. SC1470 Features ‹ ‹ ‹ ‹ Constant on-time for fast dynamic response Programmable VOUT range = 0.5 – VCCA VIN range = 1.8V – 25V DC current sense using low-side RDS(ON) Sensing or RSENSE in source of low-side MOSFET for greater accuracy Resistor programmable frequency Cycle-by-Cycle current limit Digital soft-start Combined EN and PSAVE functions Over-voltage/under-voltage fault protection and PGOOD output 5uA typical shutdown current Low quiescent power dissipation 14 Lead TSSOP package Industrial temperature range 1% Internal reference Integrated gate drivers with soft switching Efficiency > 90% Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies ‹ ‹ ‹ The frequency is constant until a step in load or line voltage ‹ occurs, at which time the pulse density and frequency ‹ will increase or decrease to counter the change in output or input voltage. After the transient event, the controller frequency will return to steady state ...