XRP7708 datasheet(11/27 Pages) EXAR

11 / 27 page

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Rev. 1.0.3

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.

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