Synchronous Buck PWM DC/DC with Dual Voltage Control Mode


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The RT8100A is an advanced DC/DC synchronous buck PWM controller with several innovative functions for specific customer's ASIC only. The part features RichTek's innovative design and topology say "analogous current mode" for current sensing and full functions for various applications including adjustable soft start, free-run and adjustable operation frequency and enable; the part is with design of 12V+12V boot strapped driver which is capable to drive up to 20Amp output current; moreover the part is with implementation of accuracy DCR current sensing topology. There are several specific features implemented and reserved for the specific customer's special applications including dual VCORE control mode including tracking and stand-alone mode, and output current indication. The part is proposed with a small footprint of VQFN-16L 3x3 package.


  • MB memory and chipset core power
  • Middle-high graphic card GPU and memory core power
  • General-purpose fields including server, NB, bare-bone and mini-system
Key Spec.
Status NRND
Recommended Alternative  RT8120E/RT8120F
Vs (typ) (V) 12
Vin (min) (V) 2.5
Vin (max) (V) 12
Vout (min) (V) 0.8
Vout (max) (V) 3.3
Output Adj. Method Resistor
Accuracy (+/- %) 1.5
Freq (typ) (kHz) 200
Freq (min) (kHz) 50
Freq (max) (kHz) 1000
Iq (typ) (mA) 10
Ext Sync No
Features Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;DCR Current Sense;Force PWM;OCP;SCP;Voltage Mode Control
Package Type VQFN3x3-16
  • Analogous Current Mode Design
  • 2.5V to 12V Switching Source Power
  • 0.8V to 3.3V Output Voltage Regulation
  • Adjustable VIN Feed-Forward Ramp Slope
  • Adjustable Operation Frequency
  • Precise Core Voltage Regulation
  • Precise DCR Current Sensing with High Quality Capacitor, X7R
  • ±1.5% System Accuracy
  • Input Voltage : 12V and 5V Bias
  • Enable Function
  • RoHS Compliant and 100% Lead (Pb)-Free
  • Over Current Protection
  • External Soft Start Setting
  • Operation Frequency up to 1.0MHz
  • Dual Mode Voltage Control
      ♦ Tracking Mode
      ♦ Stand-Alone Mode
  • Output Current Indication
  • 16-Lead VQFN Package
Title Last Update ShareDownload
Synchronous Buck PWM DC/DC with Dual Voltage Control Mode 2015/05/19