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The RT8125P PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for CPU core, I/O, and chipset RAM supplies in notebook computers.

Richtek Mach ResponseTM technology is specifically designed for providing 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.

The RT8125P 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. The Buck conversion allows this device to directly step down high voltage batteries at the highest possible efficiency. The RT8125P provides an 1% high accuracy 0.8V reference voltage with minimum 1mA source/sink current for high accuracy output application.

Applications

  • Generic DC-DC Power Regulator
  • Mother Boards and Desktop Servers
Key Spec.
RT8125P
Status Active
Vs (typ) (V) 12;5
Vin (min) (V) 1.5
Vin (max) (V) 24
Vout (min) (V) 0.3
Vout (max) (V) 3.3
Output Adj. Method Ext Vref;Resistor
Accuracy (+/- %) 1
Freq (typ) (kHz) 300
Iq (typ) (mA) 0.5
Ext Sync No
Features COT Control;Cycle-by-Cycle Current Limit;Enable Input;OVP;Power Good;Selectable (PSM or PWM);UVP
Package Type WDFN3x3-10
Features
  • Richtek Mach ResponseTM Technology
  • 1% High Accuracy 0.8V Reference
  • VCC Input Range: 4.5V to 13.2V
  • VOUT Operating Range: 0.3V to 3.3V
  • Power Stage Input Range: 1.5V to 24V
  • Fixed Operating Frequency: 300kHz
  • LG_OCSET for Current Limit
  • PGOOD Indicator
  • Embedded Bootstrap Switch
  • High-side Gate Driver Pull Low Resistor (10kΩ)
  • Current Limit with Low-side Current Sense Scheme
  • Enable Function with Internal Pull High Current
  • OVP/UVP/OTP/Pre-OVP/Current Limit
  • Shutdown Current < 100μA
Datasheet
TitleVersionLast UpdateDownload
RT8125P: High Efficiency Single Synchronous Buck PWM ControllerInitial Release2023/12/05
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