XRP7708 Exar Corporation, XRP7708 Datasheet - Page 11

• Manufacturer Part Number: XRP7708
• Description: Quad Channel Digital Pwm Step Down Controller
• Manufacturer: Exar Corporation

FEATURES AND BENEFITS
© 2010 Exar Corporation
• Eliminate temperature and time variations associated
• Tighter
• Easy configuration and re-configuration for different
• Higher integration: Many external circuits can be
• Selectable DPWM frequency and Controller Clock
• A single voltage is needed for regulation [no External
• I
• 6 Configurable GPIO pins, (4 if I
General DPWM Benefits:
Other Benefits:
with passive components in:
− Output set point
− Feedback compensation
− Frequency set point
− Under voltage lock out
− Input voltage measurement
− Gate drive dead time
frequency set point
Vout, Iout, Cout, and Inductor selection by simply
changing internal PID coefficients. No need to change
external passives for a new output specification.
handled by monitoring or modifying internal registers
Frequency
LDO required].
− Communication with a System Controller or other
− Access to modify or read internal registers that
be configured in several ways:
− Fault reporting (including OCP, OVP, Temperature,
− Allows a Logic Level interface with other non-digital
− Possible to configure as traditional ‘enable’ pin for
2
C interface allows:
Power Management devices for optimized system
function
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
Soft-Start in progress, Power Good)
IC’s or as logic inputs to other devices
all 4 outputs
faults
parameter
tolerances
2
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• Frequency and Synchronization Capability
• Internal MOSFET Drivers
• GUI
•
• Reliability is enhanced via communication with the
• System
• A system process or could also be configured to log
• If customer field service is a possibility for your end
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System Benefits:
− 2 GPIOs can be dedicated to the I
− Selectable switching frequency between 300kHz and
− Each output can be programmed to any one of 4
− Both internal clock and DPWM clock can be
− ‘Master’, ‘Slave’ and ‘Stand-alone’ Configurations
− 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
Configuration Software:
− In its simplest form only VIN, VOUT, and Iout for
− Tool calculates configuration register content based
− 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
− Once a configuration is finalized it can be sent to
− Allows parts to be used without I
system controller which can obtain real time data on
an output voltage, input voltage and current.
XRP7708 directly to obtain data or make adjustments
to react to circuit conditions
and analyze operating history, perform diagnostics and
if required, take the supply off-line after making other
system adjustments.
product,
provide additional capabilities for troubleshooting or
aid in future system upgrades.
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required by the customers design
1.5MHz
possible phases
synchronized to external sources
are possible
programmable endpoint voltage
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.
upon customer requirements. PID coefficients for
correct loop response (for automatic or customized
designs) can be generated and sent to the device.
optimization
EXAR and can reside in pre-programmed parts that
customers can order with an individual part number.
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Customizing XRP7708 with customer parameters
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