XRP7704 Exar Corporation, XRP7704 Datasheet - Page 13

• Manufacturer Part Number: XRP7704
• Description: Quad-output Digital Pwm Buck Controller
• Manufacturer: Exar Corporation

General DPWM Benefits:
Other Benefits:
REV 1.1.0
Features and Benefits
- Eliminate temperature and time variations associated with
- Tighter parameter tolerances including operating frequency set
- Easy configuration and re-configuration for different VOUT, Iout,
- Higher integration: Many external circuits can be handled by
- Selectable DPWM frequency and Controller Clock
- A single voltage is needed for regulation [no External LDO
- I
- 6 Configurable GPIO pins, (4 if I
passive components in:
point
Cout, and Inductor selection by simply changing internal PID
coefficients. No need to change external passives for a new
output specification.
monitoring or modifying internal registers
4 Independent DPWM channels in a small package
Frequency
required].
configured in several ways:
2
C interface allows:
o Output set point
o Feedback compensation
o Frequency set point
o Under voltage lock out
o Input voltage measurement
o Gate drive dead time
o Communication with a System Controller or other Power
o Access to modify or read internal registers that control or
o Fault reporting (including OCP, OVP, Temperature, Soft-
o Allows a Logic Level interface with other non-digital IC’s or
o Possible to configure as traditional ‘enable’ pin for all 4
o 2 GPIOs can be dedicated to the I
Management devices for optimized system function
monitor:
Start in progress, Power Good)
as logic inputs to other devices
outputs
by the customers design
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
EXAR CONFIDENTIAL. PROPRIETARY. DO NOT DISTRIBUTE OR COPY.
2
C is in use). Pins can be
2
C Interface as required
Quad-Output Digital PWM Buck Controller
13
System Benefits:
- Frequency and Synchronization Capability
- Internal MOSFET Drivers
- GUI (Graphical User Interface) Design and Configuration
- Customizing XRP7704 with customer parameters
- Reliability is enhanced via communication with the system
- System processors can communicate with the XRP7704
- A system processor could also be configured to log and
- If customer field service is a possibility for your end product,
programmable endpoint voltage
Software:
controller which can obtain real time data on an output
voltage, input voltage and current.
directly to obtain data or make adjustments to react to circuit
conditions
analyze operating history, perform diagnostics and if required,
take the supply off-line after making other system adjustments.
parameter reporting and history would provide additional
capabilities for troubleshooting or aid in future system
upgrades.
o Selectable switching frequency between 300kHz and
o Each output can be programmed to any one of 4 possible
o Both internal clock and DPWM clock can be synchronized
o ‘Master’, ‘Slave’ and ‘Stand-alone’ Configurations are
o Internal FET drivers (3Ω) for each Channel
o Built-In Automatic Dead-time adjustment
o 30ns Rise and Fall times
o Soft-start into a pre-biased load and Soft-stop with
o In its simplest form only VIN, VOUT, and Iout for each
o Tool calculates configuration register content based upon
o Configurations can be saved and/or recalled
o GPIOs can be configured easily and intuitively
o Synchronization configuration can be adjusted
o Interface can be used for real-time debugging and
o Once a configuration is finalized it can be sent to EXAR
o Allows parts to be used without I
1.5MHz
phases
to external sources
possible
channel is required. The XRP7704 Configuration
Software can generate all parts for a system bill of
material including: Input Capacitor, FETs, Inductor and
Output Capacitor.
customer requirements. PID coefficients for correct loop
response (for automatic or customized designs) can be
generated and sent to the device.
optimization
and can reside in pre-programmed parts that customers
can order with an individual part number.
2
C interface
XRP7704