FTM Board Club
Exar
XRP7740EVB
Quad-Output Digital PWM Buck Controller supporting high current loads Evaluation Board

The XRP7740 is a quad-output pulse-width modulated (PWM) step-down DC-DC controller with a built-in LDO for standby power and GPIOs.

The device provides a complete power management solution in one IC and is fully programmable via the included I2C serial interface. Independent Digital Pulse Width Modulator (DPWM) channels regulate output voltages and provide all required protection functions such as current limiting and over-voltage protection. Each output voltage can be programmed from 0.9V to 5.1V without the need of an external voltage divider. The wide range of the programmable DPWM switching frequency (from 300 KHz to 1.5 MHz) enables the user to optimize between efficiency and component size. Input voltage range is from 6.5V to 20V. Two controllers support a load of up to 5A, while the other two controllers support up to 15A. I2C bus interface is provided to program the IC as well as to communicate with the host for fault reporting and handling, power rail parameters monitoring, etc. The device offers a complete solution for soft-start and soft-stop. The start-up delay and ramp of each PWM regulator can be independently controlled. The device can start up a pre-biased PWM channel without causing large negative inductor current.

Features

Four switching buck (step-down) controllers each with internal FET drivers. Two controllers (2 & 4) support loads up to 15A; two controllers (1 & 3) support load up to 5A.
6.5V to 20V input voltage range no additional voltage rails required
Output voltages programmable from 0.9V to 5.1V
Up to 6 reconfigurable GPIO pins
Fully programmable via I2C interface
Independent Digital Pulse Width Modulator (DPWM) channels with five coefficient PID control
High Integration: elimination of external circuits and components required for compensation, parameter adjustment and interface
Programmable DPWM frequency range (300 kHz to 1.5 MHz) enables efficiency and component size optimization
Complete power monitoring and reporting
Independently controlled start-up delay and ramp for each regulator, including soft start with a pre-biased load voltage
Independently controlled soft-stop delay and ramp for each regulator with a programmable stop voltage
Over-temperature protection (OTP) and Under Voltage Lockout (UVLO); per-channel over-current protection (OCP) and over-voltage protection (OVP)
Built-in LDO (configurable to 3.3V or 5V) with over-current protection
Non-volatile memory for system configuration
Configuration development tools