Exar Corporation have announced the introduction of the XR77129, a quad channel Digital Pulse Width Modulated (DPWM) step down (buck) controller with an input operating voltage range from 6 to 40 V. Its patented control architecture is well suited for 40 V inputs using a 17-bit wide PID voltage mode VIN feed forward architecture. This controller offers a single input, quad output, step-down switching regulator controller with integrated gate drivers and dual LDO outputs. It can also monitor, dynamically control and configure the power system through an I2C interface. Five configurable GPIOs can be used for fault reporting and status or for sequencing control. Each XR77129 output channel is individually programmable as low as 0.6 V with a resolution of 2.5 mV

The XR77129 can be configured to power nearly any FPGA, SOC or DSP system by using Exar's PowerArchitect design tool and programmed via an I2C based, SMBus compliant, serial interface. PowerArchitect 5.2 has been upgraded to support the additional capabilities of the XR77129 including output voltage ranges beyond the native 0.6 V to 5.5 V with the use of external feedback resistors. The XR77129 wide input voltage range, low quiescent current of 450 µA (standby) and 4 mA (operating) make it ideal for a wide range of systems including 18 V to 36 VDC, 24 VDC or rectified AC systems used in the industrial automation and embedded applications.

Key features:

  • 6 to 40 V input
  • Quad channel step-down controller
  • Digital PWM 105 kHz to 1.23 MHz operation
  • SMBus compliant I2C interface
  • Supported by PowerArchitect 5.2 or later

The XR77129 is available now in a RoHS compliant, green/halogen free 7 mm x 7 mm TQFN package priced at $9.95 per unit in 1000-piece quantities.