Semtech Corporation SC1470
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. The excellent transient response means that SC1470 based solutions will require less output capacitance than competing fixed frequency converters. At light loads, Power-Save Mode enables the SC1470 to skip PWM pulses for better efficiency.| Part No. | SC1470 |
|---|---|
| Datasheet | SC1470 Download |
| Manufacturer |  Semtech Corporation |
| Description | Synchronous Buck Power Supply Controller |
| Buy | Stock & Price |
DESCRIPTION
FEATURES
include high efficiency and fast dynamic response with no minimum on time. SC1470FEATURES
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.
