Programmable PMIC powers high-current digital cores

February 11, 2015 // By Graham Prophet
XR77128 is a universal PMIC which drives up to four independently controlled external DrMOS power stages at currents above 40A for the latest 64-bit ARM processors, FPGAs, DSPs and ASICS.

DrMOS technology is, Exar notes, growing in popularity in telecom and networking applications. These same applications find value in Exar's Programmable Power technology which allows low component count, rapid development, easy system integration, dynamic control and telemetry. Depending on output current requirements, each output can be independently configured to directly drive external MOSFETs or DrMOS power stages.

The XR77128 can be configured to power nearly any FPGA, SOC or DSP system through the use of Exar's design tool, PowerArchitect and programmed through an I²C based SMBus compliant serial interface. It can also monitor and dynamically control and configure the power system through the same I²C interface. Five configurable GPIOs allow for fast system integration for fault reporting and status or for sequencing control. An Arduino-based development platform allows software engineers to begin code development for telemetry and dynamic control before their hardware is available.

Features include:

  1. DrMOS and/or MOSFET drive capability;
  2. 4.75V to 25V input voltage;
  3. Quad channel step-down controller;
  4. Digital PWM 105 kHz to 1.23 MHz operation;
  5. SMBus compliant I²C interface;
  6. Supported by PowerArchitect 5.2 or later;
  7. Arduino development system.

The XR77128, in a 7 × 7 mm TQFN, is priced at $7.75 (1000).

Exar; www.exar.com/xr77128