DAP

SW

SW

BOOT

NC

VOUT

CS

GND

VIN

VIN

VCC

VINS

RON

COMP

DIM

1

2

3

4

5

6

7

14

13

12

11

10

9

8

LM3406, LM3406HV, LM3406HV-Q1

SNVS512E – SEPTEMBER 2008 – REVISED MARCH 2014

www.ti.com

3.1 Electrostatic Discharge Caution

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.

3.1 CONNECTION DIAGRAM

LM3406 family

14-Lead Exposed Pad Plastic TSSOP Package

See Package Number PWP0014A

PIN DESCRIPTIONS

Pin(s)

Name

Description

Application Information

1,2

SW

Switch pin

Connect these pins to the output inductor and Schottky diode.

3

BOOT

MOSFET drive bootstrap pin

Connect a 22 nF ceramic capacitor from this pin to the SW pins.

4

NC

No Connect

No internal connection. Leave this pin unconnected.

5

VOUT

Output voltage sense pin

Connect this pin to the output node where the inductor and the first LED's

anode connect.

6

CS

Current sense feedback pin

Set the current through the LED array by connecting a resistor from this pin

to ground.

7

GND

Ground pin

Connect this pin to system ground.

8

DIM

Input for PWM dimming

Connect a logic-level PWM signal to this pin to enable/disable the power

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

= output on, logic low - output off.

9

COMP

Error amplifier output

Connect a 0.1 µF ceramic capacitor with X5R or X7R dielectric from this pin

to ground.

10

RON

On-time control pin

A resistor connected from this pin to VIN sets the regulator controlled on-

time.

11

VCC

Output of the internal 7V linear

Bypass this pin to ground with a minimum 0.1 µF ceramic capacitor with

regulator

X5R or X7R dielectric.

12

VINS

Input voltage PWM dimming

Connect this pin to the anode of the input diode to allow dimming by PWM

comparator input

of the input voltage

13,14

VIN

Input voltage pin

Nominal operating input range for this pin is 6V to 42V (LM3406) or 6V to

75V (LM3406HV, LM3406HV-Q1).

DAP

DAP

Thermal Pad

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

2

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