Analog Devices Inc. LT3791EFE

Mfr. Part

LT3791EFE

Manufacturer

ADI (Analog Devices, Inc.). Y-IC is a quality distributor for ADI and we are committed to providing you with the best products and services.

Detailed Description

High-voltage LED driver controller with True Color PWM dimming. Drives a single LED string using external MOSFETs in buck, boost, or buck-boost modes. Wide input range 4.7 V to 60 V and output up to 60 V. One output channel, 200 kHz to 700 kHz programmable switching frequency, analog and PWM dimming. 38-pin TSSOP with exposed thermal pad for better heat dissipation. Surface-mount.

Key Features

Wide supply range 4.7 V to 60 V

Output range 0 V to 60 V (controller topology dependent)

Topologies supported: Buck (step-down), Boost (step-up), Buck-Boost

One output channel

External power switches (no internal switch) for flexible power scaling

Dimming methods: Analog and True Color PWM

Switching frequency: 200 kHz to 700 kHz

Operating junction temperature: -40°C to +125°C (TJ)

Series: True Color PWM

Package/case: 38-TSSOP with exposed pad (38-TFSOP, 4.40 mm body width)

Mounting: Surface Mount

Automotive and lighting-ready feature set

Key Advantages

Handles wide input swings (ideal for automotive battery environments) while keeping LED current stable

True Color PWM dimming preserves LED color and brightness accuracy at very low duty cycles

External MOSFET architecture lets you choose FETs to meet power, efficiency, and cost targets

Buck/Boost flexibility simplifies designs where VIN can be above or below LED string voltage

Programmable frequency eases EMI optimization and inductor selection

Exposed pad and TSSOP footprint simplify thermal design in compact PCBs

Packaging

Type: Tube (factory standard)

Package/case: 38-TSSOP-EP (also known as 38-TFSOP Exposed Pad)

Body width: 0.173 in (4.40 mm). Compact footprint saves board space

Leads: 38 pins plus exposed thermal pad

Pin configuration: 38-lead TSSOP layout with an exposed pad that must be soldered to GND for thermal and electrical performance. Refer to the datasheet for the detailed pinout and recommended land pattern

Material: Molded plastic TSSOP with copper leadframe; exposed paddle for heat spreading

Pitch: TSSOP standard lead pitch (refer to datasheet for exact dimensions)

Thermal characteristics: Exposed pad significantly lowers thermal resistance. Actual θJA depends on PCB copper and airflow. TJ operating range -40°C to +125°C

Electrical properties summary: VIN 4.7 V to 60 V, VOUT up to 60 V (topology dependent), 1 output, 200–700 kHz switching, analog/PWM dimming, external MOSFETs, True Color PWM series

Lifecycle

Status: Active and in production based on current public information

Equivalents/alternatives: Direct drop-in or functional equivalents depend on your electrical, thermal, and compliance needs (MOSFET choices, LED current, EMI, protection features). For validated cross-references and second-source options, please contact our sales team via the Y-IC website so we can match your exact design requirements

Key Application Areas

Automotive lighting: headlights, DRL, tail lights, interior lighting

Industrial and commercial lighting: high-bay/low-bay, street lights, signage

Architectural and stage lighting with wide dimming range

Backlighting and display illumination

Battery-powered or wide-input LED systems that need buck/boost operation

LED drivers in environments with large input voltage variations

Datasheet

Our website hosts the most authoritative datasheet for this model. We recommend downloading it from the current product page to get the full specifications, pinout, layout guidance, and thermal data.

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