XRP6141

35A Synchronous Step Down COT Controller

© 2015 Exar Corporation

5/14

Rev. 2.0.0

PIN DESCRIPTION

Name

Pin Number

Description

GL

1

Driver output for Low-side N-channel synchronous MOSFET.

NC

2

Internally not connected. Leave this pin floating.

SW

3

Lower supply rail for high-side gate driver GH. Connect this pin to the junction between

the two external N-channel MOSFETs.

GH

4

Driver output for high-side N-channel switching MOSFET.

BST

5

High-side driver supply pin. Connect a 0.1uF bootstrap capacitor between BST and SW.

ILIM

6

Over-current protection programming. Connect with a resistor to the Drain of the low-

side MOSFET.

EN/MODE

7

Precision enable pin. Pulling this pin above 1.9V will turn the IC on and it will operate in

Forced CCM. If the voltage is raised above 3.0V then the IC will operate in DCM or CCM

depending on load.

TON

8

Constant on-time programming pin. Connect with a resistor to AGND.

SS

9

Soft-Start pin. Connect an external capacitor between SS and AGND to program the

soft-start rate based on the 10uA internal source current.

PGOOD

10

regulation.

FB

11

Feedback input to feedback comparator. Connect with a set of resistors to VOUT and

AGND

12, 13

Analog ground. Control circuitry of the IC is referenced to this pin.

VIN

14

IC supply input. Provides power to internal LDO.

VCC

15

The output of LDO. For operation using a 5V rail, VCC should be shorted to VIN.

PGND

16

Low side driver ground

Exposed Pad

Thermal pad for heat dissipation. Connect to AGND with a short trace.

ORDERING INFORMATION

Part Number

Temperature

Range

Marking

Package

Packing

Quantity

Note 1

XRP6141EL-F

6141

YWW

XXXX

3x3mm

QFN16

Tray

Lead Free and/or

Halogen Free

XRP6141ELMTR-F

250/Tape & Reel

XRP6141ELTR-F

3k/Tape & Reel

XRP6141EVB

XRP6141 Evaluation Board

“Y” = Year – “WW” = Work Week – “X” = Lot Number; when applicable.