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RT8228B

Richtek
Part Number RT8228B
Manufacturer Richtek
Description Single Synchronous Buck PWM Controller
Published Mar 19, 2020
Detailed Description ® RT8228B Single Synchronous Buck PWM Controller General Description The RT8228B PWM controller provides high efficien...
Datasheet PDF File RT8228B PDF File

RT8228B
RT8228B

Overview
® RT8228B Single Synchronous Buck PWM Controller General Description The RT8228B 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.
The RT8228B achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current mode PWMs.
Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs and enter diode emulation mode at light load condition.
The buck conversion allows this device to directly step down high voltage batteries at the highest possible efficiency.
The RT8228B is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.
5V.
The RT8228B is available in a WQFN-12L 2x2 package.
Ordering Information RT8228B Package Type QW : WQFN-12L 2x2 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Features z Built in 1% 0.
5V Reference Voltage z Adjustable 0.
5V to 3.
3V Output Range z Support Pure MLCC Output Capacitor z Quick Load Step Response within 100ns z 4700ppm/°C Programmable Current Limit by Low Side RDS(ON) Sensing z 4.
5V to 26V Battery Input Range z Resistor Programmable Frequency z Internal Ramp Current Limit Soft-Start Control z Drives Large Synchronous Rectifier FETs z Integrated Boost Switch z Over/Under Voltage Protection z Thermal Shutdown z Power Good Indicator z RoHS Compliant and Halogen Free Applications z Noteboo...


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