GND

DIM

BOOT

SW

VOUT

RON

LM3406/06HV

VIN,VINS

D1

L1

VCC

CS

COMP

LM3406, LM3406HV, LM3406HV-Q1

SNVS512E – SEPTEMBER 2008 – REVISED MARCH 2014

LM3406 1.5-A, Constant Current, Buck Regulator for Driving High Power LEDs

1 FEATURES

3 DESCRIPTION

The

LM3406

family

are

monolithic

switching

1

•

LM3406HV-Q1

regulators designed to deliver constant currents to

–

Automotive Grade Device

high power LEDs. Ideal for automotive, industrial, and

–

AEC-Q100 Grade 1 Qualified

general lighting applications, they contain a high-side

N-channel MOSFET switch with a current limit of

–

Operating Ambient Temperature: –40°C to

2.0A

(typical)

for

step-down

(Buck)

regulators.

125°C

Controlled on-time with true average current and an

•

Integrated 2.0A MOSFET

external current sense resistor allow the converter

•

output voltage to adjust as needed to deliver a

constant

current

to

series

and

series-parallel

•

connected LED arrays of varying number and type.

•

LED dimming via pulse width modulation (PWM) is

•

True Average Output Current Control

achieved using a dedicated logic pin or by PWM of

the power input voltage. The product feature set is

•

1.7A Minimum Output Current Limit Over

rounded out with low-power shutdown and thermal

Temperature

shutdown protection.

•

Cycle-by-Cycle Current Limit

The LM3406HV-Q1 is AEC-Q100 grade 1 qualified.

•

PWM Dimming with Dedicated Logic Input

•

PWM Dimming with Power Input Voltage

•

Simple Control Loop Compensation

•

Low Power Shutdown

•

Supports All-Ceramic Output Capacitors and

Capacitor-less Outputs

•

Thermal Shutdown Protection

•

TSSOP-14 Package

2 APPLICATIONS

•

LED Driver

•

Constant Current Source

•

Automotive Lighting

•

General Illumination

•

Industrial Lighting

3.1 TYPICAL APPLICATION

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.