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XRP7714_11 Datasheet, PDF (11/29 Pages) Exar Corporation – Quad Channel Digital PWM Step Down Controller | |||
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XRP7714
Quad Channel Digital PWM Step Down Controller
FEATURES AND BENEFITS
General DPWM Benefits:
⢠Eliminate temperature and time variations associated
with passive components in:
â Output set point
â Feedback compensation
â Frequency set point
â Under voltage lock out
â Input voltage measurement
â 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:
â Communication with a System Controller or other
Power Management devices for optimized system
function
â Access to modify or read internal registers that
control or monitor:
â Output Current
â Input and Output Voltage
â Soft-Start/Soft-Stop Time
â âPower Goodâ
â Part Temperature
â Enable/Disable Outputs
â Over Current
â Over Voltage
â Temperature Faults
â Adjusting fault limits and disabling/enabling
faults
â Packet Error Checking (PEC) on I2C communication
⢠6 Configurable GPIO pins, (4 if I2C is in use). Pins can
be configured in several ways:
â Fault reporting (including OCP, OVP, Temperature,
Soft-Start in progress, Power Good)
â Allows a Logic Level interface with other non-digital
ICâs or as logic inputs to other devices
â Possible to configure as traditional âenableâ pin for
all 4 outputs
â 2 GPIOs can be dedicated to the I2C Interface as
required by the customers design
⢠Frequency and Synchronization Capability
â Selectable switching frequency between 300kHz and
1.5MHz
â Channel to channel phase relationship is a fixed 90
degrees
â Main oscillator clock and DPWM clock can be
synchronized to external sources
â âMasterâ, âSlaveâ and âStand-aloneâ Configurations
are possible
⢠Internal MOSFET Drivers
â Internal FET drivers (3Ω/6Ω) for each Channel
â Built-In Automatic Dead-time adjustment
â 30ns Rise and Fall times
⢠PowerArchitect⢠Design and Configuration Software:
â In its simplest form only VIN, VOUT, and Iout for
each channel is required.
â The software 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.
â Configurations can be saved and/or recalled
â GPIOs can be configured easily and intuitively
â Synchronization configuration can be adjusted
â Interface can be used for real-time debugging and
optimization
⢠Customizing XRP7714 with customer parameters
â 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.
â 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
XRP7714 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.
© 2011 Exar Corporation
11/29
Rev. 1.1.6
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