IADJ

EN

CSN

LM3409/HV

UVLO

D1

L1

VCC

COFF

GND

Q1

CSP

PGATE

DAP

VIN

1

2

3

4

5

6

7

8

9

10

LM3409, LM3409HV, LM3409-Q1

www.ti.com

SNVS602J – MARCH 2009 – REVISED MAY 2013

PFET Buck Controller for High Power LED Drivers

Check for Samples: LM3409, LM3409HV, LM3409-Q1

1

FEATURES

DESCRIPTION

The LM3409/09N/09HV/09Q/09QHV are P-channel

2

•

LM3409Q/LM3409QHV is an Automotive Grade

MosFET (PFET) controllers for step-down (buck)

Product That is AEC-Q100 Grade 1 Qualified

current regulators. They offer wide input voltage

•

2

Ω, 1A Peak MosFET Gate Drive

range, high-side differential current sense with low

•

adjustable

threshold

voltage

and

fast

output

enable/disable function and a thermally enhanced

(LM3409/LM3409Q/LM3409N)

VSSOP-10 package. These features combine to

•

make the LM3409 family of devices ideal for use as

•

Differential, High-side Current Sense

constant current sources for driving LEDs where

•

Cycle-by-Cycle Current Limit

forward currents up to 5A are easily achievable.

•

No Control Loop Compensation Required

The LM3409 devices use Constant Off-Time (COFT)

control to regulate an accurate constant current

•

10,000:1 PWM Dimming Range

without

the

need

for

external

control

loop

•

250:1 Analog Dimming Range

compensation. Analog and PWM dimming are easy to

•

Supports All-Ceramic Output Capacitors and

implement and result in a highly linear dimming range

Capacitor-less Outputs

with

excellent

achievable

contrast

ratios.

Programmable UVLO, low-power shutdown, and

•

Low Power Shutdown and Thermal Shutdown

thermal shutdown complete the feature set.

•

Thermally Enhanced VSSOP-10 Package

The LM3409/09Q/09N have an operational input

•

Dual Inline Package (LM3409N)

voltage range up to 42V, while the LM3409HV/QHV

are high voltage options with an input voltage range

APPLICATIONS

up to 75V. The LM3409/09HV/09Q/09QHV come in a

•

LED Driver

thermally enhanced 10-lead VSSOP package, while

the LM3409N comes in a 14-lead PDIP package. The

•

Constant Current Source

LM3409Q/LM3409QHV

are

automotive

grade

•

Automotive Lighting

products that are AEC-Q100 grade 1 qualified.

•

General Illumination

Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.