Products
LT3932
LT3932-1
PRODUCTION
36V, 2A Synchronous Step-Down LED Driver
- Part Models
- 18
- 1ku List Price
- Starting From $3.26
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Part Details
- ±1.5% LED Current Regulation
- ±1.2% Output Voltage Regulation
- 5000:1/10000+:1 PWM Dimming at 100Hz (LT3932/LT3932-1)
- 128:1 Internal PWM Dimming
- Spread-Spectrum Frequency Modulation
- Silent Switcher® Architecture for Low EMI
- 3.6V to 36V Input Voltage Range
- 0V to 36V LED String Voltage
- 200kHz to 2MHz with SYNC Function
- 99.9% Maximum Duty Cycle
- 20:1 Analog or Duty Cycle LED Current Control
- Open/Short LED Protection and Fault Indication
- Accurate LED Current Sense with Monitor Output
- Programmable UVLO
- Thermally Enhanced 28-Pin (4mm × 5mm) QFN
- AEC-Q100 Qualified for Automotive Applications
The LT3932, featuring the Silent Switcher® architecture to minimize EMI/EMC emissions, 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. An output voltage limit can be set with a resistor divider to the FB pin.
The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI. The LT3932 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. The LT3932-1 permits higher dimming ratios.
Additional features include 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 Lighting
- Industrial and General Purpose Lighting
- Machine Vision Systems
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
Analog Dialogue 2
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 Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process |
||
| LT3932EUFD#PBF | PRODUCTION | |
| LT3932EUFD#TRPBF | PRODUCTION | |
| LT3932EUFD-1#PBF | PRODUCTION | |
| LT3932EUFD-1#TRPBF | PRODUCTION | |
| LT3932HUFD#PBF | PRODUCTION | |
| LT3932HUFD#TRPBF | PRODUCTION | |
| LT3932HUFD-1#PBF | PRODUCTION | |
| LT3932HUFD-1#TRPBF | PRODUCTION | |
| LT3932IUFD#PBF | PRODUCTION | |
| LT3932IUFD#TRPBF | PRODUCTION | |
| LT3932IUFD-1#PBF | PRODUCTION | |
| LT3932IUFD-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
Tools & Simulations
LTspice 2
- LT3932 - LED Driver IC
- LT3932 Demo Circuit - Low EMI, High Efficiency Step-Down LED Driver (9-36V to 7V Max LED @ 1A)
Models for the following parts are available in LTspice:
- LT3932
- LT3932-1
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
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
LT3932 Demo Board | VIN = 8V to 36V driving two series LEDs (1ALED/6.6VLED) at 2MHz
Resources
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