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PDF XRP7708 Data sheet ( Hoja de datos )
| Número de pieza | XRP7708 | |
| Descripción | Quad Channel Digital PWM Step Down Controller | |
| Fabricantes | Exar | |
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February 2010
XRP7708www.DataSheet4U.com
Quad Channel Digital PWM Step Down Controller
Rev. 1.0.3
GENERAL DESCRIPTION
The XRP7708 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 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.
Two controllers support a load of up to 5A,
while the other two controllers support up to
8A. 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 Equipments
• Industrial & Telecom Equipments
• Processors & DSPs Based Equipments
FEATURES
• 4 Channel Step Down Controller
− 2 x 5A Channels & 2 x 8A Channels
− 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 power monitoring and
reporting
• Full On Board Protection
OTP, UVLO, OCP and OVP
• Built-in 3.3V/5V LDO
• Configuration development tools
• Green/Halogen Free 40-pin TQFN
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7708 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
BLOCK DIAGRAM
XRP7708www.DataSheet4U.com
Quad Channel Digital PWM Step Down Controller
© 2010 Exar Corporation
Fig. 2: XRP7708 Block Diagram
5/27
Rev. 1.0.3
5 Page 
XRP7708www.DataSheet4U.com
Quad Channel Digital PWM Step Down Controller
FEATURES AND BENEFITS
General DPWM Benefits:
• Eliminate temperature and time variations associated
with passive components in:
− Output set point
− Feedback compensation
− Frequency set point
− Under voltage lock out
− Input voltage measurement
− Gate drive dead time
• Tighter parameter tolerances including operating
frequency set point
• Easy configuration and re-configuration for different
Vout, Iout, Cout, and Inductor selection by simply
changing internal PID coefficients. No need to change
external passives for a new output specification.
• Higher integration: Many external circuits can be
handled by monitoring or modifying internal registers
• Selectable DPWM frequency and Controller Clock
Frequency
Other Benefits:
• A single voltage is needed for regulation [no External
LDO required].
• I2C interface allows:
− Communication with a System Controller or other
Power Management devices for optimized system
function
− Access to modify or read internal registers that
control or monitor:
− Output Current
− Input and Output Voltage
− Soft-Start/Soft-Stop Time
− ‘Power Good’
− Part Temperature
− Enable/Disable Outputs
− Over Current
− Over Voltage
− Temperature Faults
− Adjusting fault limits and disabling/enabling
faults
• 6 Configurable GPIO pins, (4 if I2C is in use). Pins can
be configured in several ways:
− Fault reporting (including OCP, OVP, Temperature,
Soft-Start in progress, Power Good)
− Allows a Logic Level interface with other non-digital
IC’s or as logic inputs to other devices
− Possible to configure as traditional ‘enable’ pin for
all 4 outputs
− 2 GPIOs can be dedicated to the I2C Interface as
required by the customers design
• Frequency and Synchronization Capability
− Selectable switching frequency between 300kHz and
1.5MHz
− Each output can be programmed to any one of 4
possible phases
− Both internal clock and DPWM clock can be
synchronized to external sources
− ‘Master’, ‘Slave’ and ‘Stand-alone’ Configurations
are possible
• Internal MOSFET Drivers
− Internal FET drivers (3Ω) for each Channel
− Built-In Automatic Dead-time adjustment
− 30ns Rise and Fall times
− Soft-start into a pre-biased load and Soft-stop with
programmable endpoint voltage
• GUI (Graphical User Interface) Design and
Configuration Software:
− In its simplest form only VIN, VOUT, and Iout for
each channel is required. The XRP7708
Configuration Software can generate all parts for a
system bill of material including: Input Capacitor,
FETs, Inductor and Output Capacitor.
− Tool calculates configuration register content based
upon customer requirements. PID coefficients for
correct loop response (for automatic or customized
designs) can be generated and sent to the device.
− Configurations can be saved and/or recalled
− GPIOs can be configured easily and intuitively
− Synchronization configuration can be adjusted
− Interface can be used for real-time debugging and
optimization
• Customizing XRP7708 with customer parameters
− Once a configuration is finalized it can be sent to
EXAR and can reside in pre-programmed parts that
customers can order with an individual part number.
− Allows parts to be used without I2C interface
System Benefits:
• Reliability is enhanced via communication with the
system controller which can obtain real time data on
an output voltage, input voltage and current.
• System processors can communicate with the
XRP7708 directly to obtain data or make adjustments
to react to circuit conditions
• A system process or could also be configured to log
and analyze operating history, perform diagnostics and
if required, take the supply off-line after making other
system adjustments.
• If customer field service is a possibility for your end
product, parameter reporting and history would
provide additional capabilities for troubleshooting or
aid in future system upgrades.
© 2010 Exar Corporation
11/27
Rev. 1.0.3
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet XRP7708.PDF ] | |
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