XRP7704ILB-F

XRP7704 Quad-Output Digital PWM Buck Controller September 2009 REV 1.1.0 GENERAL DESCRIPTION KEY FEATURES ƒ Four switching buck (step-down) controllers each with internal FET drivers ƒ 6.5V to 20V input voltage range – no additional voltage rails required ƒ Output voltages programmable from 0.9V to 5.1V ƒ Up to 6 reconfigurable GPIO pins ƒ Fully programmable via I2C interface ƒ Independent Digital Pulse Width Modulator (DPWM) channels with five coefficient PID control ƒ High Integration: elimination of external circuits and components required for compensation, parameter adjustment and interface ƒ Programmable DPWM frequency range (300 kHz to 1.5 MHz) enables efficiency and component size optimization ƒ Complete power monitoring and reporting ƒ Independently controlled start-up delay and ramp for each regulator, including soft start with a pre-biased load voltage ƒ Independently controlled soft-stop delay and ramp for each regulator with a programmable stop voltage ƒ Over-temperature protection (OTP) and Under Voltage Lockout (UVLO); per-channel over-current protection (OCP) and over-voltage protection (OVP) ƒ Built-in LDO (configurable to 3.3V or 5V) with over-current protection ƒ Non-volatile memory for system configuration ƒ Configuration development tools 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 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. 2 I C 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 softstop. 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. APPLICATIONS 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 ƒ ƒ ƒ ƒ ƒ Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com 1 XRP7704 Quad-Output Digital PWM Buck Controller REV 1.1.0 ABSOLUTE MAXIMUM RATINGS VIN1, VIN2…………………..…………………………….….. 22V LXx……………..………………………………………. -1V to 22V Logic Inputs……………………………………………............ 6V BSTx, GHx……...…………………………… ….…………… 27V Storage Temperature……………………..……. -65°C to 150 °C Thermal Resistance……………………………………... 18°C/W Lead Temperature (Soldering, 10 sec)…………………..300 °C These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCCA, VCCD, LDOOUT, GLx, VOUTx…………………….……..6V AVDD, DVDD.……………………………………………………...2.0V ELECTRICAL SPECIFICATIONS Unless otherwise specified: Ta=Tj=25°C, 6.5≤VIN1≤20V, 6.5≤VIN2≤20V, ENABLE=HIGH, CGL=CGH=1nF. Those specifications denoted by a ♦ are guaranteed over the full operating temperature range, -40°C