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XR77128 - Quad Output Digital PWM/PFM Universal PMIC

General Description

The XR77128 is a quad channel digital Pulse Width Modulated (PWM) step down (buck) controller.

A wide 4.75V to 5.5V and 5.5V to 25V input voltage range allows for single supply operation from standard power rails.

Key Features

  • Quad Channel Step-down Controller  Digital PWM 105kHz-1.23MHz Operation  Individual Channel Frequency Selection  Patented digital PFM with Ultrasonic mode  Patented Over Sampling Feedback  Programmable 5 coefficient PID control  Integrated MOSFET Drivers  Supports DrMOS devices.
  • 4.75V to 5.5V and 5.5V to 25V Input Voltage.
  • 0.6V to 5.5V Output Voltage (higher with exter- nal feedback resistors).
  • SMBus Compliant I2C Interface.
  • Full Power Monitoring and Reporting.

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XR77128 Quad Output Digital PWM/PFM Universal PMIC General Description The XR77128 is a quad channel digital Pulse Width Modulated (PWM) step down (buck) controller. A wide 4.75V to 5.5V and 5.5V to 25V input voltage range allows for single supply operation from standard power rails. With integrated FET gate drivers, two LDOs for standby power and a 105kHz to 1.23MHz independent channel to channel programmable constant operating frequency, the XR77128 reduces overall component count, solution footprint and optimizes conversion efficiencies. A selectable digital Pulse Frequency Mode (PFM) capable of better than 80% efficiency at light current load and low operating current allow for portable and Energy Star compliant applications.