XRP7704 datasheet(7/31 Pages) EXAR

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XRP7704

REV 1.1.0

Quad-Output Digital PWM Buck Controller

PIN DESCRIPTION

QFN

PIN #

PIN NAME

DESCRIPTION

VIN1

Power source for the internal linear regulators to generate VCCA, VDD and the

Standby LDO (LDOOUT). Place a decoupling capacitor close to the controller IC.

Also used in UVLO1 fault generation – if VIN1 falls below the user programmed

limit, all channels are shut down. The VIN1 pin needs to be tied to VIN2 on the

board with a short trace.

VIN2

If the Vin2 pin voltage falls below the user programmed UVLO VIN2 level all

channels are shut down. The VIN2 pin needs to be tied to VIN1 on the board with

a short trace.

VCCA

Output of the internal 5V LDO. This voltage is internally used to power analog

blocks.

Note that a compensation capacitor should be used on this pin [see Application

Note].

VCCD

Gate Drive input voltage. This is not an output voltage. This pin can be connected

to VCCA to provide power for the Gate Drive.

VCCD should be connected to VCCA with the shortest possible trace and

decouple with a minimum 1uF capacitor.

Alternatively, VCCD could be connected to an external supply (not greater than

5V).

36,31,

16,21

PGND1-

PGND4

Power Ground. Ground connection for the low side gate driver.

AVDD

Output of the internal 1.8V LDO. A decoupling capacitor should be placed between

AVDD and AGND close to the chip (with short traces).

DVDD

Input for powering the internal digital logic. This pin should be connected to

AVDD.

DGND

Digital Ground. This pin should be connected to the ground plane at the exposed

pad with a separate trace.

AGND

Analog Ground. This pin should be connected to the ground plane at the exposed

pad with a separate trace.

17,22,

30,55

GL1-GL4

Output pin of the low side gate driver. Connect directly to the respective gate of an

external N-channel MOSFET.

19,24,

28,33

GH1-GH4

Output pin of the high side gate driver. Connect directly to the respective gate of

an external N-channel MOSFET.

34,29,

23,18

LX1-LX4

Lower supply rail for the high-side gate driver (GHx). Connect this pin to the

switching node at the junction between the two external power MOSFETs and the

inductor. These pins are also used to measure voltage drop across bottom

MOSFETs in order to provide output current information to the control engine.

32,27,

20,25

BST1-BST4

High side driver supply pin(s). Connect BST to an external boost diode and a

capacitor as shown in the front page diagram.

The high side driver is connected between the BST pin and LX pin.

EXAR CONFIDENTIAL. PROPRIETARY. DO NOT DISTRIBUTE OR COPY.

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