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LM3421-Q1 Datasheet

N-Channel Controllers

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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-, 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
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.




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LM3421-Q1 Datasheet Preview

LM3421-Q1 Datasheet

N-Channel Controllers

No Preview Available !

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.
2 Submit Documentation Feedback
Copyright © 2019, Texas Instruments Incorporated
Product Folder Links: LM3421-Q1 LM3423-Q1


Part Number LM3421-Q1
Description N-Channel Controllers
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