Catalog
60V Synchronous Boost LED Controller
Key Features
• 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 withOPENLEDFlag
• Short-Circuit Protection andSHORTLEDFlag
• Drives LEDs in Boost, SEPIC, Buck Mode, or BuckBoost Mode Configurations
• 28 Lead TSSOP and QFN (4mm × 5mm) Exposed Pad Packages
Description
AI
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.ApplicationsIndustrial and Automotive LightingAccurate Current-Limited Voltage Regulators