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XRP7708 Datasheet(PDF) 1 Page - Exar Corporation

Part # XRP7708
Description  Quad Channel Digital PWM Step Down Controllers
Download  28 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7708 Datasheet(HTML) 1 Page - Exar Corporation

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April 2012
Rev. 1.2.2
Exar Corporation
www.exar.com
48720 Kato Road, Fremont CA 94538, USA
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
GENERAL DESCRIPTION
The XRP7708 and XRP7740 are quad-output
pulse-width modulated (PWM) step-down DC-
DC controllers with a built-in LDO for standby
power and GPIOs. The devices provide a
complete power management solution in one
IC and are fully programmable via an 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.
An 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
Multi Channel Programmable
Power Supplies
Audio-Video Equipment
Industrial & Telecom Equipment
Processors & DSPs Based Equipment
FEATURES
4 Channel Step Down Controller
3ohm/1.8ohm driver – XRP7740
5ohm/1.8ohm driver – XRP7708
Programmable Output Voltage 0.9V-5.1V
Programmable 1.5MHz DPWM Frequency
6.5V-20V Single Input Voltage Range
Up to 6 Reconfigurable GPIO Pins
Fully Programmable via I2C Interface
Independent Digital Pulse Width
Modulator (DPWM) channels
Complete Monitoring and Reporting
Complete Power Up/Down Sequencing
Full On Board Protection
OTP, UVLO, OCP and OVP
Built-in 3.3V/5V LDO
PowerArchitect™ Design Software
Green/Halogen Free 40-pin TQFN
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7708 or XRP7740 Application Diagram
XRP7708
XRP7740
Exposed Pad: AGND


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