LT3922
LT3922
PRODUCTION36V, 2A Synchronous Step-Up LED Driver
- Part Models
- 6
- 1ku List Price
- Starting From $4.13
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Overview
- ±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
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
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 2
Video 1
Rarely Asked Question 2
Analog Dialogue 1
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) | ||
| LT3922EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3922HUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3922HUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3922IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3922IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 3, 2020 - 20_0206 LT3922 Datasheet Limit Changes |
||
| LT3922EUFD#PBF | PRODUCTION | |
| LT3922EUFD#TRPBF | PRODUCTION | |
| LT3922HUFD#PBF | PRODUCTION | |
| LT3922HUFD#TRPBF | PRODUCTION | |
| LT3922IUFD#PBF | PRODUCTION | |
| LT3922IUFD#TRPBF | PRODUCTION | |
|
Apr 11, 2019 - 19_0067 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 | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3922
- LT3922-1
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.
Evaluation Kits
LT3922 Demo Board | Synchronous Boost LED Driver, 4V ≤ VIN ≤ 28V, VLED = 34V @ Up to 330mA, 2MHz fSWITCH