SC470
Overview
- Constant on-time for fast dynamic response Programmable VOUT range = 0.5 - VCCA VBAT 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 on-time Cycle-by-cycle current limit Digital soft-start Combined EN and PSAVE functions Over-voltage/under-voltage fault protection and PGD output 20% OVP threshold for simpler dynamic voltage transition circuitry 5µA typical shutdown current Low quiescent power dissipation 14 lead TSSOP and 16 pin MLPQ (4mm x 4mm) packages Industrial temperature range 0.85% DC accuracy Integrated gate drivers with soft-switching * *
- The SC470 is specifically targeted for graphics processor
- power supplies that require dynamic voltage transition,
- with a tight 0.85% DC accuracy and a 20% OVP threshold. 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 operation. At light loads, Power-Save Mode enables the SC470 to skip PWM pulses for better efficiency. The output voltage can be adjusted from 0.5V to VCCA. The integrated gate drivers feature adaptive shootthrough protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start,
