XRP7704

The XRP7704 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 overvoltage 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.

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.

The Exar Configuration Model XR77xxEVB-XCM-V80 interface board provides designers with a simple, quick and inexpensive means of evaluating and prototyping new designs using Programmable Universal PMIC devices with PowerArchitect4. This Evaluation Board is designed only for low volume engineering purposes; not production volumes. For production requirements commercial programmers must be used. The Evaluation Board is provided “as is and whereas” and without any warranty as to results, merchantability or purpose. Exar is not responsible for misuse of the Evaluation Board.

• Four switching buck (step-down) controllers each with internal FET drivers
• 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 undervoltage lockout (UVLO); per-channel overcurrent protection (OCP) and overvoltage protection (OVP)
• Built-in LDO (configurable to 3.3V or 5V) with overcurrent protection
• Non-volatile memory for system configuration
• Configuration Module (XCM) available for evaluation and development purposes only
• PowerArchitect™ Design and Configuration Software
• Third-Party Programming Support

• Computing: servers, storage systems
• Consumer: Set-top Box (STB), game systems
• Industrial: ATE, DC-DC converters, video processing
• Plasma Display Panel (PDP)
• Networking and telecommunications equipment