SC411

Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller POWER MANAGEMENT Description The SC411 is a constant on-time synchronous buck PWM controller in a space-saving MLPQ package intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on-time. The excellent transient response means that SC411 based solutions will require less output capacitance than competing fixed frequency converters. www.DataSheet4U.com SC411 Features 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 sense resistor Resistor programmable frequency Cycle-by-cycle current limit Digital soft-start Powersave option Over-voltage/under-voltage fault protection 10μA typical shutdown current Low quiescent power dissipation Power good indicator 1.2% reference Integrated gate drivers with soft switching Enable pin 16 pin MLPQ (4mm x 4mm) Output soft discharge upon shutdown The switching frequency is constant until a step-in load or line voltage occurs. During this 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, Powersave Mode enables the SC411 to skip PWM pulses for better efficiency. The output voltage can be adjusted from 0.5V to V...