RT8238B
Description
The RT8238B PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers. The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.
Key Features
- Built in 1% 0.5V Reference Voltage
- Adjustable 0.5V to 3.3V Output Range
- Quick Load Step Response within 100ns
- 4700ppm/°C Programmable Current Limit by Low Side RDS(ON) Sensing
- 4.5V to 26V Battery Input Range
- Resistor Programmable Frequency
- Internal Ramp Current Limit Soft-Start Control
- Drives Large Synchronous Rectifier FETs
- Integrated Boost Switch
- Over/Under Voltage Protection
