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XRP7704 Datasheet, PDF (1/31 Pages) Exar Corporation – Quad-Output Digital PWM Buck Controller | |||
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XRP7704
Quad-Output Digital PWM Buck Controller
September 2009
GENERAL DESCRIPTION
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.
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.
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
REV 1.1.0
KEY FEATURES
 Four switching buck (step-down) controllers each with
internal FET drivers
 6.5V to 20V input voltage range â 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
Exar Corporation 48720 Kato Road, Fremont CA, 94538 ⢠(510) 668-7000 ⢠FAX (510) 668-7017 ⢠www.exar.com
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