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uP1911R

2 to 4 Phase PWM Extender for Multiphase Synchronous Buck Converter

Datasheets PDF

General Description

The uP1911R is a high precision sequence array, which is intended for operation phase number extension in multiphase synchronous-rectified buck converter. It consists of three individual sequence circuits to support up to 2 to 4 phase extension application. This part has 4 PWM outputs for external MOSFET drivers, and 4 ISEN inputs. With this phase extender, a 2-phase buck PWM controller is able to control a 4-phase synchronous buck regulator. This device has an internal LDO that regulates 12V input to a 5.2V output as the power supply of control logic. Designed with 12V CMOS process, the uP1911R provides high switching speed and low power dissipation. The uP1911R is available in WQFN3x3 – 16L package.

Pin Configuration & Typical Application Circuit


Low-Side MOSEFET Rds(on) Current Sense


Inductor DCR Current Sense

Feature

  • 5V/12V Supply Voltage
  • Integrated 5.2V LDO Regulator for 12V Input
  • Support 1 to 2, 2 to 4 Phase Extension
  • Low Power Dissipation
  • Low Charge Injection
  • Near Zero Switching Time
  • RoHS Compliant and Halogen Free
  • WQFN3x3 – 16L Package

Application

  • Desktop Computer
  • Motherboards