XRP7708 datasheet(11/28 Pages) EXAR

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Rev. 1.2.2

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 for each Channel: 3Ω/1.8Ω for

XRP7740 and 5Ω/1.8Ω for XRP7708

−

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

•

PowerArchitect™ Design and Configuration Software:

−

In its simplest form only VIN, VOUT, and Iout for

each channel is required.

−

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.

−

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 XRP7708/40 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

XRP7708/40 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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