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LM3421-Q1 Datasheet Preview

LM3421-Q1 Datasheet

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LM3421-Q1, LM3423-Q1

SNVSB95 – JULY 2019

LM342x-Q1 N -Channel Controllers for Constant-Current LED Drivers

1 Features

•1 AEC Qualified for Automotive Applications

– Device Temperature Grade 1: −40°C ≤ TA ≤

125°C (LM3421-Q1 and LM3423-Q1)

– Device Temperature Grade 0: −40°C ≤ TA ≤

150°C (LM3421-Q0 and LM3423-Q0)

• VIN Range From 4.5 V to 75 V

• High-Side Adjustable Current Sense

• 2-Ω, 1-A Peak MOSFET Gate Driver

• Input Undervoltage and Output Overvoltage

Protection

• PWM and Analog Dimming

• Cycle-by-Cycle Current Limit

• Programmable Switching Frequency

• Zero Current Shutdown and Thermal Shutdown

• LED Output Status Flag (LM3423-Q1 and

LM3423-Q0 Only)

• Fault Status Flag and Timer(LM3423-Q1 and

LM3423-Q0 Only)

2 Applications

• LED Drivers: Buck, Boost, Buck-Boost, and

SEPIC

• Indoor and Outdoor Area SSL

• Automotive

• General Illumination

• Constant-Current Regulators

3 Description

The LM3421-Q1 and LM3423-Q1 family of devices

are versatile high voltage N-channel MOSFET

controllers for LED drivers. They can be easily

configured in buck, boost, buck-boost and SEPIC

topologies. This flexibility, along with an input voltage

rating of 75 V, makes the these controllers ideal for

illuminating LEDs in a large family of applications.

Adjustable high-side current sense voltage allows for

tight regulation of the LED current with the highest

efficiency possible. The LM3421-Q1 and LM3423-Q1

devices use predictive off-time (PRO) control, which

is a combination of peak current-mode control and a

predictive off-timer. This method of control eases the

design of loop compensation while providing inherent

input voltage feed-forward compensation.

The LM3421-Q1 and LM3423-Q1 devices include a

high-voltage start-up regulator that operates over a

wide input range of 4.5 V to 75 V. The internal PWM

controller is designed for adjustable switching

frequencies of up to 2 MHz, thus enabling compact

solutions.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM3421-Q1

HTSSOP (16)

5.00 mm × 4.40 mm

LM3423-Q1

HTSSOP (20)

6.50 mm × 4.40 mm

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

the end of the data sheet.

Typical Boost Application

VIN

PWM

1 VIN

2 EN

3 COMP

4 CSH

5 RCT

6 AGND

7 OVP

8 nDIM

HSN 16

HSP 15

RPD 14

IS 13

VCC 12

GATE 11

PGND 10

DDRV 9

ILED

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.

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LM3421-Q1 Datasheet Preview

LM3421-Q1 Datasheet

N-Channel Controllers

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LM3421-Q1, LM3423-Q1

SNVSB95 – JULY 2019

www.ti.com

Table of Contents

1 Features .................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Device Comparison ............................................... 3

6 Pin Configuration and Functions ......................... 4

7 Specifications......................................................... 5

7.1 Absolute Maximum Ratings ..................................... 5

7.2 ESD Ratings ............................................................ 6

7.3 Recommended Operating Conditions....................... 6

7.4 Thermal Information .................................................. 6

7.5 Electrical Characteristics .......................................... 7

7.6 Typical Characteristics ........................................... 11

8 Detailed Description ............................................ 13

8.1 Overview ................................................................. 13

8.2 Functional Block Diagram ....................................... 13

8.3 Feature Description................................................. 14

9 Application and Implementation ........................ 28

9.1 Application Information............................................ 28

9.2 Typical Applications ................................................ 32

10 Power Supply Recommendations ..................... 65

10.1 General Recommendations .................................. 65

10.2 Input Supply Current Limit .................................... 65

11 Layout................................................................... 65

11.1 Layout Guidelines ................................................. 65

11.2 Layout Example .................................................... 66

12 Device and Documentation Support ................. 67

12.1 Device Support...................................................... 67

12.2 Related Links ........................................................ 67

12.3 Community Resources.......................................... 67

12.4 Trademarks ........................................................... 67

12.5 Electrostatic Discharge Caution ............................ 67

12.6 Glossary ................................................................ 67

13 Mechanical, Packaging, and Orderable

Information ........................................................... 67

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

DATE

July 2019

REVISION

NOTES

Initial release of separate data sheet for atomotive grade devices. For revision history

before December 2018, see the LM3421 and LM3423 data sheet.

Changed EN Pulldown Resistance maximum value for LM3421-Q1 and LM3423-Q1 from:

1.3 MΩ to: 2.85 MΩ in the table.

Changed EN Pulldown Resistance maximum value for LM3421-Q0 and LM3423-Q0 from:

1.3 MΩ to: 3.15 MΩ in the table.

Changed EN Pulldown Resistance minimum value from: 0.45 MΩ to: 0.245 MΩ in the table.

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