XRP6142 View Datasheet(PDF) - Exar Corporation

Part Name

Description

Manufacturer

XRP6142

Synchronous Step-Down Controller with DDR Memory Termination

Exar Corporation 

PIN ASSIGNMENT

XRP6142

Synchronous Step-Down Controller with DDR

Memory Termination

Figure. 3: XRP6142 Pin Assignment

PIN DESCRIPTION

Name

AGND

VTTREF

VDDQ/2

VREF

REFIN

FB

CSGND

ILIM

PGND

GL

SW

GH

BST

VIN

Vcc

EN

Thermal pad

Pin Number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

-

Description

Analog Ground

Buffered output of VDDQ/2

VTT reference voltage for DDR applications.

Buffer input voltage.

Voltage used for the input to the VTTREF buffer

Precision reference output

Reference input to the switching-regulator feedback comparator

Feedback input to feedback comparator

Current-sense ground

Connect a resistor between this pin and the low-side current-sense element in order to

set the current-limit-trip threshold. See applications section for instructions on how to

set this resistor

Gate driver GND.

Low-side N-channel MOSFET driver

Switch node for floating-high-side gate drive

High-side N-channel MOSFET driver

Bootstrap capacitor to drive the high-side gate driver, GH

Input voltage for the power train

Input voltage for the XRP6142 internal circuitry and gate drives. VIN and VCC can be tied

together when VIN ≥ 3.0V

Precision enable pin. Pulling this pin above 1.2V will turn the part on

Internally connected to AGND

© 2010 Exar Corporation

Page 4 of 17

Rev. 1.0.0

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