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LM3409/HV

UVLO

D1

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Q1

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Design

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.

LM3409, LM3409-Q1, LM3409HV, LM3409HV-Q1

SNVS602L – MARCH 2009 – REVISED JUNE 2016

LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers

1

1 Features

1

•

LM3409-Q1 and LM3409HV-Q1 are Automotive

Grade Products: AEC-Q100 Grade 1 Qualified

•

2-

Ω, 1-A Peak MOSFET Gate Drive

•

•

Q1)

•

Differential, High-Side Current Sense

•

Cycle-by-Cycle Current Limit

•

No Control Loop Compensation Required

•

10,000:1 PWM Dimming Range

•

250:1 Analog Dimming Range

•

Supports All-Ceramic Output Capacitors and

Capacitor-less Outputs

•

Low-Power Shutdown and Thermal Shutdown

•

Thermally Enhanced 10-Pin, HVSSOP Package

2 Applications

•

LED Driver

•

Constant Current Source

•

Automotive Lighting

•

General Illumination

3 Description

The

LM3409,

LM3409-Q1,

LM3409HV,

and

LM3409HV-Q1

are

P-channel

MOSFET

(PFET)

controllers for step-down (buck) current regulators.

They offer wide input voltage range, high-side

differential

current

sense

with

low

adjustable

threshold voltage and fast output enable/disable

function and a thermally enhanced 10-pin, HVSSOP

package. These features combine to make the

LM3409 family of devices ideal for use as constant

current sources for driving LEDs where forward

currents up to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT)

control to regulate an accurate constant current

without

the

need

for

external

control

loop

compensation. Analog and PWM dimming are easy to

implement and result in a highly linear dimming range

with

excellent

achievable

contrast

ratios.

Programmable UVLO, low-power shutdown, and

thermal shutdown complete the feature set.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM3409

HVSSOP (10)

3.00 mm × 3.00 mm

PDIP (14)

19.177 mm × 6.35 mm

LM3409-Q1

HVSSOP (10)

3.00 mm × 3.00 mm

LM3409HV

LM3409HV-Q1

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic