Overview
Features and Benefits
- 3000:1 External PWM Dimming
- 250:1 Internal PWM Dimming
- Wide VIN Operating Range: 2.5V to 38.5V
- Synchronous Boost Output Voltage up to 60V
- Spread-Spectrum Frequency Modulation for Lower EMI
- PMOS Switch Driver for PWM and Output Disconnect
- Constant Current (±3.5%) Regulation
- Constant Voltage (±2%) Regulation
- Rail-to-Rail LED Current Sense: 0V to 60V
- Programmable VIN Undervoltage Lockout
- Analog Dimming via Two Control Pins
- 100kHz to 1MHz Operation
- Programmable Open LED Protection with OPENLED Flag
- Short-Circuit Protection and SHORTLED Flag
- Drives LEDs in Boost, SEPIC, Buck Mode, or BuckBoost Mode Configurations
- 28 Lead TSSOP and QFN (4mm × 5mm) Exposed Pad Packages
Product Details
The LT3762 is a synchronous DC/DC controller designed to operate as a constant-current source and constant-voltage regulator. It features a programmable internal PWM dimming signal generator and a synchronous gate driver. The LT3762 is ideally suited for driving high current LEDs with high efficiency and reduced power loss. Rail-to-rail switch current sensing enables synchronous boost topologies and nonsynchronous topologies such as SEPIC. A voltage feedback pin serves as the input for several LED protection features and also allows the converter to operate as a constant-voltage source.
A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance and external component size. Adding a capacitor at SSFM pin activates the Spread-Spectrum Modulation feature to reduce EMI. The LT3762 also includes an integrated DC/DC converter to efficiently produce a regulated 7.5V supply for the N-channel MOSFET gate drivers. The PWM pin controls PWMTG to drive the P-channel MOSFET, allowing a high PWM dimming range (3000:1) and providing LED overcurrent protection and short-circuit protected boost capability.
Applications
- Industrial and Automotive Lighting
- Accurate Current-Limited Voltage Regulators
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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Synchronous Boost Converter Powers High Current LEDs Even at Low Input Voltages2/1/2019 Analog Dialogue
Tools & Simulations
LTspice
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.
LTspice Simulations
Models for the following parts are available in LTspice:
LT3762
Design Resources
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PCN-PDN Information
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Sample & Buy
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.