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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Analog Devices Inc. LT3761EMSE-1#TRPBF

Name: LT3761EMSE-1#TRPBF
Brand: Analog Devices Inc.
SKU: LT3761EMSE-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LT3761EMSE-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: LED Drivers

Package:: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Datasheet:: LT3761EMSE-1#TRPBF.pdf

Description:: IC LED DRIVER CTRLR PWM 16MSOP

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Product details

Overview

LT3761EMSE-1#TRPBF from Analog Devices is a 4.5V–60V input, constant-frequency current-mode DC/DC controller optimized for high-current LED driving in boost, SEPIC, inverting, buck-boost, and flyback topologies. It delivers ±3% constant-current regulation and ±2% constant-voltage regulation, features internal PWM dimming (4–96% duty, 300Hz typical), and supports external clock synchronization via SYNC pin. It is used in automotive headlamps requiring >100V LED strings with grounded-anode configuration.

For engineers reviewing the LT3761EMSE-1#TRPBF datasheet, LT3761EMSE-1#TRPBF pinout, LT3761EMSE-1#TRPBF application, or LT3761EMSE-1#TRPBF equivalent, key selection criteria include its 100kHz–1MHz programmable switching frequency, rail-to-rail 0V–80V high-side/low-side current sense capability, 3000:1 True Color PWM™ dimming ratio, and thermal shutdown protection at 165°C.

Technical Context

The LT3761EMSE-1#TRPBF implements a fixed-frequency current-mode control architecture with integrated gate driver and dual-loop regulation (current via ISP/ISN, voltage via FB). Its error amplifier output (VC) sets peak switch current based on either CTRL-adjusted V_ISP-ISN threshold (250mV full-scale) or FB reference (1.25V), enabling seamless transition between constant-current and constant-voltage modes.

Unlike the LT3761, the LT3761-1 variant replaces OPENLED with SYNC functionality: the SYNC pin accepts external logic-level clocks (100kHz–1MHz), requires RT programming to run 20% slower than sync frequency, and enables precise timing alignment for multi-phase or noise-sensitive systems. The DIM/SS pin simultaneously controls soft-start timing and PWMOUT dimming frequency/duty via internal current sources.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN Range	4.5V to 60V - supports direct connection to automotive battery (cold-crank down to 4.5V) and industrial 48V rails without pre-regulation.
Current Sense Range	0V to 80V rail-to-rail - enables high-side sensing of LED strings exceeding 100V while referenced to ground.
Switching Frequency	100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce inductor size but increase switching losses.
PWM Dimming Ratio	Up to 3000:1 - achieved with external PWM signal; internal generator provides 4–96% duty at ~300Hz for basic dimming.
Regulation Accuracy	±3% CC / ±2% CV - ensures stable LED brightness and battery charging voltage across temperature and line/load variations.
SYNC Input Compatibility	Logic-level sync (1.5V high, 0.4V low) - allows deterministic phase alignment with system clocks or other converters.
Thermal Protection	165°C junction shutdown - latches off GATE and PWMOUT until thermal recovery, preventing MOSFET overstress.

Pinout & Package

LT3761EMSE-1#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17 = GND), requiring soldering to PCB ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
PWMOUT (1)	Buffered PWM output	Drives NMOS disconnect FET or level-shifts PWM signal; toggles low during FB overvoltage (>VFB+60mV) for LED protection.
FB (2)	Voltage feedback input	Sets constant-voltage regulation point at 1.25V; enables open-LED detection when V_ISP-ISN <25mV and FB < VFB−50mV.
ISN (3)	Negative current sense input	Connects to low side of sense resistor; bias current varies with CTRL voltage and ISP/ISN differential.
ISP (4)	Positive current sense input	Connects to high side of sense resistor; overcurrent triggers GATE/PWMOUT shutdown if V_ISP-ISN >600mV.
VC (5)	Error amplifier output	Integrates loop error; RC compensation network here stabilizes both CC and CV loops.
CTRL (6)	Current threshold adjust	Linearly scales V_ISP-ISN threshold from 25mV (0.2V) to 250mV (≥1.2V); enables analog dimming and temperature compensation.
VREF (7)	2.02V reference output	Supplies up to 185µA; used to bias CTRL divider for analog dimming or thermal foldback.
PWM (8)	Digital dimming input	Accepts external PWM (200µA drive capability); self-oscillates when capacitor tied to GND, with duty set by DIM/SS current.
SYNC (9)	External clock input	Replaces OPENLED on -1 variant; synchronizes oscillator to external logic clock; requires RT setting 20% slower than sync frequency.
DIM/SS (10)	Soft-start & dimming control	Charging current (12µA typ.) sets PWMOUT frequency/duty; also resets soft-start on UVLO or fault.
RT (11)	Frequency programming	Resistor to GND sets switching frequency; 95.3kΩ = 100kHz, 8.87kΩ = 1MHz.
EN/UVLO (12)	Enable & undervoltage lockout	1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise hysteresis resistor selection.
INTVCC (13)	Internal LDO output	7.85V regulated supply for gate drivers; requires 1µF ceramic bypass close to pin and exposed pad.
VIN (14)	Main power input	Supplies INTVCC LDO; must be bypassed with ≥0.22µF low-ESR capacitor near pin.
SENSE (15)	Switch current sense	Kelvin-connected to source of external N-FET; senses peak switch current with 105mV limit threshold.
GATE (16)	N-FET gate driver	Drives external power MOSFET between INTVCC and GND; turns off during shutdown/fault/idle.
GND (17)	Power & signal ground	Exposed pad; must be soldered to PCB ground plane for thermal dissipation and current sense return path.

Key Features

Feature	Design Value
True Color PWM™ dimming	3000:1 ratio preserves LED color consistency across dimming range without flicker or color shift.
High-voltage current sense	Rail-to-rail 0V–80V ISP/ISN inputs enable >100V LED strings with grounded-anode topology and no level-shifting circuitry.
Multi-topology support	Configurable for boost, SEPIC, inverting, buck-boost, and flyback - eliminates need for separate controllers per application.
Integrated analog + PWM dimming	CTRL pin enables linear current scaling (0–100%) while PWM input provides high-ratio digital dimming - supports hybrid dimming schemes.
Output short-circuit protection	Automatic GATE/PWMOUT shutdown when V_ISP-ISN >600mV, plus 4µs forced low pulse on DIM/SS and PWM pins to clear latch.
Thermally enhanced MSOP	16-lead MSOP with exposed pad achieves θ_JA = 43°C/W - sustains 125°C ambient operation with minimal heatsinking.

Applications

Automotive Headlamps	Industrial High-Bay Lighting
Use Scenario: Driving 48V–96V white LED strings in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current controller regulating up to 3A LED current in boost configuration; SYNC pin aligns switching with camera frame rate for strobe-free imaging. Use Value: Enables precise 3000:1 dimming without color shift, supports cold-crank operation down to 4.5V, and withstands load-dump transients up to 60V.	Use Scenario: Powering 72V LED arrays in warehouse lighting with DALI-compatible analog dimming interface. IC Role / Device Role / Timing Role: Constant-current regulator with CTRL-based 0–10V analog dimming input; operates in SEPIC mode to maintain regulation during wide input variation (12–57V AC/DC). Use Value: Eliminates need for isolated feedback; 80V ISP/ISN range accommodates string voltage drift over lifetime; ±3% current accuracy ensures uniform luminance across fixtures.
Battery Charging Systems	Medical Endoscopic Illumination
Use Scenario: Charging 24V LiFePO₄ battery packs with C/10 termination and voltage clamp at 28.8V. IC Role / Device Role / Timing Role: Constant-voltage regulator using FB loop; C/10 indication triggered when V_ISP-ISN drops below 25mV during taper charge. Use Value: Integrates charge termination logic without external comparators; open-LED detection repurposed as end-of-charge flag; 125°C operating range supports sealed battery enclosures.	Use Scenario: Driving ultra-bright 36V LED modules in surgical endoscopes requiring flicker-free, low-noise illumination. IC Role / Device Role / Timing Role: Low-noise constant-current source in buck-boost configuration; SYNC pin locks switching to master system clock to suppress EMI in sensitive RF environments. Use Value: 3000:1 True Color PWM™ enables smooth dimming from full intensity to inspection-level low light; 16-lead MSOP fits tight board space; <1µA shutdown current extends portable battery life.

Automotive Headlamps

Industrial High-Bay Lighting

Use Scenario: Driving 48V–96V white LED strings in adaptive front-lighting systems (AFS) with dynamic beam shaping.

IC Role / Device Role / Timing Role: Constant-current controller regulating up to 3A LED current in boost configuration; SYNC pin aligns switching with camera frame rate for strobe-free imaging.

Use Value: Enables precise 3000:1 dimming without color shift, supports cold-crank operation down to 4.5V, and withstands load-dump transients up to 60V.

Use Scenario: Powering 72V LED arrays in warehouse lighting with DALI-compatible analog dimming interface.

IC Role / Device Role / Timing Role: Constant-current regulator with CTRL-based 0–10V analog dimming input; operates in SEPIC mode to maintain regulation during wide input variation (12–57V AC/DC).

Use Value: Eliminates need for isolated feedback; 80V ISP/ISN range accommodates string voltage drift over lifetime; ±3% current accuracy ensures uniform luminance across fixtures.

Battery Charging Systems

Medical Endoscopic Illumination

Use Scenario: Charging 24V LiFePO₄ battery packs with C/10 termination and voltage clamp at 28.8V.

IC Role / Device Role / Timing Role: Constant-voltage regulator using FB loop; C/10 indication triggered when V_ISP-ISN drops below 25mV during taper charge.

Use Value: Integrates charge termination logic without external comparators; open-LED detection repurposed as end-of-charge flag; 125°C operating range supports sealed battery enclosures.

Use Scenario: Driving ultra-bright 36V LED modules in surgical endoscopes requiring flicker-free, low-noise illumination.

IC Role / Device Role / Timing Role: Low-noise constant-current source in buck-boost configuration; SYNC pin locks switching to master system clock to suppress EMI in sensitive RF environments.

Use Value: 3000:1 True Color PWM™ enables smooth dimming from full intensity to inspection-level low light; 16-lead MSOP fits tight board space; <1µA shutdown current extends portable battery life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3783EFE#PBF	Fixed 500kHz frequency; no internal PWM generator; requires external PWM source for dimming.	Lacks self-oscillating dimming and SYNC capability; suited for fixed-frequency systems where external timing is available.	Select when deterministic 500kHz operation is required and external PWM generation is already present.
LT3965EFE#PBF	Integrated 6-channel LED driver with I²C interface; 60V max VIN; no high-side current sense capability.	Designed for multi-string RGBW control with digital addressability; not suitable for single high-power string >100V.	Choose for digitally controlled multi-string architectures where analog high-voltage string control is unnecessary.

Compared with LTC3783EFE#PBF and LT3965EFE#PBF, the LT3761EMSE-1#TRPBF uniquely combines internal PWM generation, external clock synchronization, and 0V–80V rail-to-rail current sense-making it optimal for high-voltage, high-dynamic-range LED systems where timing flexibility and analog simplicity are critical.

Availability

LT3761EMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial high-bay fixtures, medical endoscopic illumination, and battery charging systems requiring stable component supply across extended temperature ranges.

Supply support for LT3761EMSE-1#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LT3761/LT3761-1 product line was designed specifically for high-efficiency, high-voltage LED current regulation with flexible topology support and robust protection-targeting demanding applications like automotive headlamps and industrial solid-state lighting.

FAQ

What is the key functional difference between LT3761EMSE-1#TRPBF and LT3761EMSE#TRPBF?

The LT3761EMSE-1#TRPBF replaces the OPENLED fault indicator pin (Pin 9) with a SYNC input for external clock synchronization, whereas the LT3761EMSE#TRPBF retains OPENLED for open-LED detection. Both share identical current/voltage regulation, dimming, and protection features-but only the -1 variant supports deterministic phase alignment with system clocks, making LT3761EMSE-1#TRPBF essential for noise-sensitive or multi-converter designs.

Can LT3761EMSE-1#TRPBF drive LED strings above 100V?

Yes. LT3761EMSE-1#TRPBF supports rail-to-rail 0V–80V current sensing at ISP/ISN, enabling safe high-side sensing of LED strings exceeding 100V when configured in boost or SEPIC topologies with grounded-anode LEDs. Its 60V VIN rating and 80V ISP/ISN common-mode range eliminate need for level-shifting circuits in high-voltage LED applications.

How does the internal PWM dimming generator work on LT3761EMSE-1#TRPBF?

The internal PWM dimming generator on LT3761EMSE-1#TRPBF uses the DIM/SS pin's 12µA (typical) pull-up current to charge an external capacitor on the PWM pin. The resulting oscillation frequency and duty cycle depend on DIM/SS current magnitude-enabling programmable dimming from 4% to 96% duty at ~300Hz (with 47nF capacitor). This eliminates need for external PWM sources in basic dimming applications.

What protection features are implemented in LT3761EMSE-1#TRPBF?

LT3761EMSE-1#TRPBF integrates open-LED detection (via FB and ISP/ISN monitoring), output short-circuit protection (V_ISP-ISN >600mV triggers shutdown), overtemperature shutdown (165°C), INTVCC undervoltage lockout, and SENSE pin current limiting (105mV threshold). All protections force GATE and PWMOUT low and activate fault pulses on DIM/SS and PWM pins for reliable system-level fault handling.

Is LT3761EMSE-1#TRPBF compatible with both high-side and low-side current sensing?

Yes. LT3761EMSE-1#TRPBF supports configurable high-side or low-side current sensing via ISP/ISN inputs. In high-side configuration, ISP connects to LED string anode and ISN to sense resistor; in low-side, ISN connects to ground and ISP to resistor-enabling layout flexibility and compatibility with grounded-cathode or grounded-anode LED architectures without performance trade-offs.

LT3761EMSE-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: True Color PWM™

Package/Case:: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: DC DC Controller

Topology:: Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 60V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 100kHz ~ 1MHz

Dimming:: Analog, PWM

Applications:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-MSOP-EP

LT3761EMSE-1#TRPBF FAQ

1.How can I place an order for LT3761EMSE-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT3761EMSE-1#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LT3761EMSE-1#TRPBF reliable?

The price and inventory of LT3761EMSE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761EMSE-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LT3761EMSE-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761EMSE-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT3761EMSE-1#TRPBF?

LT3761EMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT3761EMSE-1#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LT3761EMSE-1#TRPBF?

For technical support, including LT3761EMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761EMSE-1#TRPBF requirements.

6.How does Aetrix verify that LT3761EMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT3761EMSE-1#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT3761EMSE-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LT3761EMSE-1#TRPBF?

All LT3761EMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761EMSE-1#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LT3761EMSE-1#TRPBF part is unused and in its original packaging.

Return procedure for LT3761EMSE-1#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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