LT3922
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LT3922

36V, 2A Synchronous Step-Up LED Driver

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LTspice LT3922 Demo Circuit - Low EMI, High Efficiency Boost LED Driver (4-28V to 34V LED @330mA) Download 4.00KB LTspice LT3922 - LED Driver IC Download 3.73 KB
Part Models 6
1ku List Price Starting From $3.26
Features
  • ±2.5% LED Current Regulation
  • ±2% Output Voltage Regulation
  • 5000:1 PWM Dimming at 100Hz
  • 128:1 Internal PWM Dimming
  • Spread-Spectrum Frequency Modulation
  • Silent Switcher® Architecture for Low EMI
  • Operates in Boost, Buck Mode and Buck-Boost Mode
  • 2.8V to 36V Input Voltage Range
  • Up to 34V LED String Voltage
  • 2A, 40V Internal Switches
  • 200kHz to 2MHz with SYNC Function
  • Analog or Duty Cycle LED Current Control
  • Open/Short LED Protection and Fault Indication
  • Thermally Enhanced 28-Pin (4mm × 5mm) QFN
Additional Details
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The LT3922 is a monolithic, synchronous, step-up DC/DC converter that utilizes fixed-frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. The LT3922 will maintain ±2.5% current regulation through an external sense resistor over a wide range of output voltages.

The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock applied at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI. The LT3922 also includes a driver for an external high side PMOS for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available.

Additional features include an accurate external reference voltage for use with the CTRL and PWM pins, an LED current monitor, an accurate EN/UVLO pin threshold, open-drain fault reporting for open-circuit and short-circuit load conditions, and thermal shutdown.

APPLICATIONS

  • Automotive and Industrial Lighting
  • Machine Vision
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file View Data Sheet (Rev.B)
Documentation View All Documentation
LTspice LT3922 Demo Circuit - Low EMI, High Efficiency Boost LED Driver (4-28V to 34V LED @330mA) Download 4.00KB LTspice LT3922 - LED Driver IC Download 3.73 KB
Part Models 6
1ku List Price Starting From $3.26
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LT3922

Documentation

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Data Sheet

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UPDATED 02/08/2021
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LT3922: 36V, 2A Synchronous Step-Up LED Driver Data Sheet (Rev.B)

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UPDATED 11/22/2016
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LT3922: 36V、2A同期整流式昇圧LEDドライバ データシート

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Reliability Data

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UPDATED 04/17/2019
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R580 Reliability Data redirect icon

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UPDATED 08/18/2016
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Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM redirect icon

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UPDATED 08/01/2018
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Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM Dimming redirect icon

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UPDATED 08/25/2016
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DC2247A - Demo Manual redirect icon

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Design Note

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UPDATED 10/12/2016
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Design Note 557: Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting redirect icon

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UPDATED 10/12/2016
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设计要点 557: 低 EMI LED 驱动器具有用于汽车照明的 2A、40V、集成型同步开关 redirect icon

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DN-557: 2A、40V 同期スイッチを内蔵した自動車照明向け低 EMI LEDドライバ redirect icon

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Documentation

Technical Documents 6
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Data Sheet 1

LT3922: 36V, 2A Synchronous Step-Up LED Driver Data Sheet (Rev.B)

Reliability Data 1

R580 Reliability Data

User Guide 1

DC2247A - Demo Manual

Design Note 1

Design Note 557: Low EMI LED Driver Features 2A, 40V, Integrated, Synchronous Switches for Automotive Lighting

Technical Articles 2

Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM
Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM Dimming

Rarely Asked Question Page 2

Keeping EMI from LED Drivers Under Control
Mitigation Strategies for Tricky FM Band Conducted EMI

Analog Dialogue 1

Does the Assembly Orientation of an SMPS Inductor Affect Emissions?

Video

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Video

2017-09-18

06:03

Low EMI LED Driver with Synchronous Internal 2A Switches

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3922EUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LT3922EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LT3922HUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LT3922HUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LT3922IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3922IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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Jun 3, 2020

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LT3922 Datasheet Limit Changes

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Datasheet Specification Comparison

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Apr 11, 2019

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Notification of Wafer Fab Location Change for 0.35 BCD Process

LT3922EUFD#PBF

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LT3922EUFD#TRPBF

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LT3922HUFD#PBF

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LT3922HUFD#TRPBF

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LT3922IUFD#TRPBF

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Jun 3, 2020

- 20_0206

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LT3922 Datasheet Limit Changes

LT3922EUFD#PBF

PRODUCTION

LT3922EUFD#TRPBF

PRODUCTION

LT3922HUFD#PBF

PRODUCTION

LT3922HUFD#TRPBF

PRODUCTION

LT3922IUFD#PBF

PRODUCTION

LT3922IUFD#TRPBF

PRODUCTION

pdf

PCN20_0206_Form

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xls

Material_Report

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pdf

Datasheet Specification Comparison

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Apr 11, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT3922EUFD#PBF

PRODUCTION

LT3922EUFD#TRPBF

PRODUCTION

LT3922HUFD#PBF

PRODUCTION

LT3922HUFD#TRPBF

PRODUCTION

LT3922IUFD#PBF

PRODUCTION

LT3922IUFD#TRPBF

PRODUCTION

pdf

PCN19_0067_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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pdf

Qualification Results Summary

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Detailed Parts List

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Other

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Software & Part Ecosystem

Parts Product Life Cycle Description

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Evaluation Kits 1

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DC2247A

LT3922 Demo Board | Synchronous Boost LED Driver, 4V ≤ VIN ≤ 28V, VLED = 34V @ Up to 330mA, 2MHz fSWITCH

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DC2247A

LT3922 Demo Board | Synchronous Boost LED Driver, 4V ≤ VIN ≤ 28V, VLED = 34V @ Up to 330mA, 2MHz fSWITCH

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DC2247A
LT3922 Demo Board | Synchronous Boost LED Driver, 4V ≤ VIN ≤ 28V, VLED = 34V @ Up to 330mA, 2MHz fSWITCH
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Product Detail

Demonstration circuit DC2247A is a synchronous 2MHz boost LED driver featuring the LT®3922. The LT3922 features a low EMI Silent Switcher architecture and an optional spread spectrum frequency modulation (SSFM) that further reduces EMI. It has a 2A/36V internal power switch, but the demo board has been configured to use a 4V to 28V input and thus has input overvoltage lockout set at 28V. It drives a single string of LEDs at 330mA up to 34V when the input voltage is between 7V and 28V.


DC2247A comes with low EMI features including optimized layout, SSFM, and input and output filters. It passes CISPR 25 class 5 conducted and radiated EMI. The LT3922 is protected against both open and short LED conditions and reports these faults. It also includes thermal shutdown. 

Resources

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DC2247A - Design Files Download

922.00K

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DC2247A - Schematic Download

37.00K

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DC2247A - Demo Manual Download

889.00K

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Evaluation Kits1

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DC2247A

LT3922 Demo Board | Synchronous Boost LED Driver, 4V ≤ VIN ≤ 28V, VLED = 34V @ Up to 330mA, 2MHz fSWITCH

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LT3922 Demo Circuit - Low EMI, High Efficiency Boost LED Driver (4-28V to 34V LED @330mA) Download

4.00K

spice tool Lt Spice

LT3922 - LED Driver IC Download

3.73 K

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