DIM

SNS

HYS

VIN

HG

GND

ILIM

CS

1

2

3

4

8

7

6

5

LM3401

SNVS516C – AUGUST 2007 – REVISED MAY 2013

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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

CONNECTION DIAGRAM

Figure 1. Top View

8-Lead VSSOP

See DGK Package

PIN DESCRIPTIONS

Pin #

Pin

Description

Name

1

CS

Current sense pin. Connect to the PFET drain

2

DIM

Dimming input pin. When DIM is low, the HG drive is off. Can be connected to a logic level PWM signal

3

SNS

Current feedback pin – to LED cathode. Connect a resistor from this pin to ground to set the DC LED current

4

HYS

Hysteresis adjust pin. Connect a resistor from this pin to GND to set the hysteresis window

5

GND

Ground pin

6

HG

Gate drive output. Connect to the PFET gate

7

VIN

Power supply input

8

ILIM

Current limit adjust pin. Connect a resistor from this pin to the PFET source to set the current limit threshold

2

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