SW

1

RON

2

VIN

3

BOOT

4

VCC

8

GND

7

DIM

6

CS

5

DAP

SW

1

RON

2

VIN

3

BOOT

4

VCC

8

GND

7

DIM

6

CS

5

LM3402, LM3402HV

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SNVS450F – SEPTEMBER 2006 – REVISED OCTOBER 2015

5 Pin Configuration and Functions

DGK Package

DDA Package

8-Pin VSSOP

8-Pin HSOP

Top View

Top View

Pin Functions

PIN

I/O

DESCRIPTION

NO.

NAME

1

SW

O

Switch pin. Connect this pin to the output inductor and Schottky diode.

2

BOOT

O

MOSFET drive bootstrap pin. Connect a 10-nF ceramic capacitor from this pin to SW.

Input for PWM dimming. Connect a logic-level PWM signal to this pin to enable and disable the power

3

DIM

I

MOSFET and reduce the average light output of the LED array.

4

GND

—

Ground pin. Connect this pin to system ground.

Current sense feedback pin. Set the current through the LED array by connecting a resistor from this pin to

5

CS

I

ground.

6

RON

I

ON-time control pin. A resistor connected from this pin to VIN sets the regulator controlled ON-time.

Output of the internal 7-V linear regulator. Bypass this pin to ground with a minimum 0.1-µF ceramic capacitor

7

VCC

O

with X5R or X7R dielectric.

Input voltage pin. Nominal operating input range for this pin is 6 V to 42 V (LM3402) or 6 V to 75 V

8

VIN

I

(LM3402HV).

DAP

—

Thermal Pad. Connect to ground. Place 4-6 vias from DAP to bottom layer ground plane.

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