SDA datasheet(13/29 Pages) EXAR

13 / 29 page

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Rev. 1.0.1

FUNCTIONAL OVERVIEW

The XRP7724 is a quad-output digital pulse

width modulation (DPWM) controller with

integrated

gate

drivers

for

use

with

synchronous buck switching regulators. Each

output voltage can be programmed from 0.6V

to 5.5V without the need of an external

voltage divider. The wide range of the

programmable DPWM switching frequency

(from 105 kHz to 1.2 MHz) enables the user to

optimize for efficiency or component sizes.

Since the digital regulation loop requires no

external

passive

components,

loop

performance is not compromised due to

external component variation or operating

condition.

The XRP7724 provides a number of critical

safety

features,

such

Over-Current

Protection (OCP), Over-Voltage

Protection

(OVP), Over Temperature Protection (OTP)

plus input Under Voltage Lockout (UVLO). In

addition, a number of key health monitoring

features such as warning level flags for the

safety functions, Power Goods (PGOOD), etc.,

plus full monitoring of system voltages and

currents. The above are all programmable

and/or readable from the SMBus and many

are steerable to the GPIOs for hardware

monitoring.

For hardware communication, the XRP7724

has two logic level General Purpose Input-

Output (GPIO) pins and three, 15V, open

drain, Power System Input-Output (PSIO)

pins. Two pins are dedicated to the SMBus

data (SDA) and clock (SCL). Additional pins

include Chip Enable (Enable), Aux Boost

Feedback (BFB) and External PLL Capacitor

(CPLL).

In addition to providing four switching outputs,

the XRP7724 also provides control for an Aux

boost

supply,

and

two

stand-by

linear

regulators that produce 5V and 3.3V for a total

of 7 customer usable supplies in a single

device.

The 5V LDO is used for internal power and is

also available for customer use to power

external circuitry. The 3.3V LDO is solely for

customer use and is not used by the chip.

There is also a 1.8V linear which is for internal

use only and should not be used externally.

A key feature of the XRP7724 is its powerful

power

management capabilities. All four

outputs are independently programmable and

gives the user not only full control of the

delay, ramp, and sequence during power up

and power down. One can also control of how

the outputs interact and power down in the

event of a fault.

This includes active ramp

down of the output voltages to remove an

output voltage as quickly as possible. Another

nice feature is that the outputs can be defined

and controlled as groups.

The

XRP7724

has

two

main

types

programmable memory. The first types are

runtime registers that contain configuration,

control and monitoring information for the

chip. The second type is rewritable Non-

Volatile Flash Memory (NVFM) that is used for

permanent storage of the configuration data

along with various chip internal functions.

During power up the run time registers are

loaded from the NVFM allowing for standalone

operation.

The XRP7724 brings an extremely high level of

functionality

and

performance

programmable

power

system.

Ever

decreasing

product

budgets

require

the

designer

quickly

make

good

cost/performance

tradeoffs

truly

successful.

incorporating

switching

channels, two user LDOs, a charge pump

boost controller, along with internal gate

drivers, all in a single package, the XRP7724

allows for extremely cost effective power

system designs.

Another key cost factor to

put into the cost tradeoffs, which is often

overlooked, is the unanticipated Engineering

Change Order (ECO). The programmable

versatility of the XRP7724, along with the lack

hard

wired,

board

configuration

components, allows for minor and major

changes to be made, in circuit, on the board

by simple reprogramming.

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