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Analog Devices Inc. LT3761HMSE#PBF
- Part No.:
- LT3761HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761HMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,378
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Product details
Overview
LT3761HMSE#PBF from Analog Devices (formerly Linear Technology) is a 4.5V to 60V input, constant-current/constant-voltage DC/DC controller optimized for high-current LED driving in boost, SEPIC, buck-boost, and flyback topologies. It integrates a programmable internal PWM dimming generator (4–96% duty), supports high-side or low-side current sensing up to 80V common-mode, delivers ±3% current regulation accuracy, and operates across –40°C to +150°C junction temperature. It is used in automotive headlamps requiring 25:1 internal PWM dimming and robust open-LED protection.
For engineers reviewing the LT3761HMSE#PBF datasheet, LT3761HMSE#PBF pinout, LT3761HMSE#PBF application, or LT3761HMSE#PBF equivalent, key selection criteria include its rail-to-rail 0V–80V current sense range, 100kHz–1MHz adjustable switching frequency, integrated C/10 battery charge indication, thermally enhanced 16-lead MSOP package with exposed pad, and H-grade extended temperature qualification (–40°C to +150°C).
Technical Context
The LT3761HMSE#PBF employs fixed-frequency current-mode control with slope compensation, enabling stable operation across wide VIN (4.5V–60V) and output voltage ranges. Its dual-loop architecture simultaneously regulates LED current via ISP/ISN differential sensing (full-scale threshold 250mV ±3%) and output voltage via FB feedback (1.25V ±2%), with automatic loop dominance management.
It features a programmable internal PWM generator whose duty ratio (4%–96%) and frequency (215Hz–435Hz) are set by DIM/SS pin current and external CPWM capacitor; it also supports external PWM dimming up to 3000:1 true-color ratio. The H-grade variant guarantees full electrical performance over –40°C to +150°C junction temperature, with thermal shutdown at >165°C and exposed-pad GND for enhanced thermal dissipation.
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 common-mode - enables high-side sensing of grounded-anode LED strings >100V without level-shifting circuitry. |
| Regulation Accuracy | ±3% constant-current, ±2% constant-voltage - ensures tight LED brightness consistency and battery charging termination precision. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to balance efficiency, EMI, and external component size (e.g., 350kHz typical for 60W headlamp). |
| Dimming Capability | 3000:1 external PWM + 25:1 internal PWM - provides flicker-free, color-stable dimming for automotive lighting and architectural LED systems. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive applications and high-ambient industrial environments. |
| Shutdown Current | <1µA - enables ultra-low-power standby in always-on vehicle systems. |
Pinout & Package
LT3761HMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17), which must be soldered to PCB ground for thermal and electrical integrity. θJA = 43°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output / FB overvoltage fault indicator | Drives external NMOS disconnect switch; toggles low if FB exceeds VFB + 60mV - provides active LED overvoltage protection. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when ISP–ISN < 25mV and FB < VFB – 50mV. |
| ISN (3) | Negative current sense input | Completes high-side or low-side current sense path; bias current varies with CTRL voltage - critical for accurate analog dimming calibration. |
| ISP (4) | Positive current sense input | Accepts up to 80V common-mode voltage; overcurrent detection triggers at 600mV difference vs ISN - protects against shorted LED strings. |
| VC (5) | Error amplifier output | High-impedance node during PWM low; stores demand state on external RC network - enables seamless transition between PWM dimming cycles. |
| CTRL (6) | Current sense threshold adjust | Linearly scales VISP–ISN threshold from 25mV (0.2V) to 250mV (1.2V); enables precise analog dimming and temperature compensation. |
| VREF (7) | 2.02V reference output | Supplies up to 185µA; drives CTRL divider for analog dimming or LED thermal foldback - eliminates need for external reference. |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external 3000:1 PWM signal or configures internal oscillator with CPWM capacitor - dual-mode dimming flexibility. |
| OPENLED (9) | Open-drain fault indicator (LT3761 only) | Pulls low when open-LED condition detected; requires external pull-up to INTVCC - provides system-level fault signaling without additional logic. |
| DIM/SS (10) | Soft-start / PWM generator programming | 12µA internal pull-up sets PWMOUT duty/frequency; capacitor value determines soft-start time and dimming waveform stability. |
| RT (11) | Frequency adjustment | Resistor to GND programs switching frequency from 100kHz to 1MHz - allows optimization for efficiency (low f) or compact magnetics (high f). |
| EN/UVLO (12) | Enable / input undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise UVLO hysteresis setting with external resistor. |
| INTVCC (13) | Internal LDO output (7.85V) | Supplies GATE/PWMOUT drivers and internal circuits; 30mA current limit and 390mV dropout at –10mA - powers gate drivers directly from VIN. |
| VIN (14) | Main power input | Input for INTVCC LDO and internal logic; requires local 0.22µF ceramic bypass - handles transients up to 60V absolute max. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NFET; 105mV current limit threshold - enables accurate peak-current mode control with minimal noise susceptibility. |
| GATE (16) | N-channel MOSFET driver | Drives external power switch between INTVCC and GND; 25ns rise/fall times support high-frequency operation - reduces switching losses in high-power designs. |
| GND (17) | Power/thermal ground (exposed pad) | Primary current return path and thermal conduction surface; must be soldered to large PCB copper area - critical for achieving 150°C junction rating. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable internal PWM generator | Enables standalone LED dimming without external microcontroller - reduces BOM count and firmware complexity in cost-sensitive lighting modules. |
| Rail-to-rail 0V–80V current sense inputs | Supports grounded-anode LED configurations and high-voltage strings (>100V) without isolated amplifiers - simplifies layout and improves reliability in automotive front-lighting. |
| C/10 battery charge indication | Provides precise end-of-charge signal for Li-ion and lead-acid batteries using same ISP/ISN sense path - enables dual-use in LED driver + charger applications. |
| Output short-circuit protected boost | Automatically disables GATE/PWMOUT and pulls DIM/SS low for 4µs on ISP–ISN > 600mV - prevents catastrophic failure during LED string short events. |
| Thermally enhanced MSOP with exposed pad | Delivers 4°C/W junction-to-case thermal resistance - sustains 60W+ LED loads in compact form factor without heatsink in ambient ≤85°C. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) headlamp with dynamic zone control and high-lumen output. IC Role / Device Role / Timing Role: Constant-current LED controller managing multiple parallel LED strings in boost configuration, with real-time analog dimming via CTRL pin. Use Value: Delivers 94% efficiency at 60W, 25:1 internal PWM dimming for glare-free illumination, and open-LED fault reporting via OPENLED pin - meets ISO 11270 functional safety requirements. | Use Scenario: Smart warehouse lighting with DALI-2 interface and thermal derating based on ambient temperature. IC Role / Device Role / Timing Role: Primary LED current regulator in SEPIC topology, using VREF and CTRL to implement temperature-compensated current reduction. Use Value: Enables ±3% current accuracy over –40°C to +150°C, eliminating need for external temperature sensors and reducing calibration overhead in production. |
| Battery-Powered LED Flashlights | Capacitor Charging Systems |
Use Scenario: High-output tactical flashlight powered by 2S Li-ion battery with runtime optimization. IC Role / Device Role / Timing Role: Buck-boost LED driver maintaining constant luminance as battery discharges from 8.4V to 6V. Use Value: Wide 4.5V–60V VIN range accommodates 1S–4S battery stacks; <1µA shutdown current extends shelf life - achieves >12hr runtime at 1000lm. | Use Scenario: Precision supercapacitor charger for energy harvesting nodes with voltage-clamped constant-current profile. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator in buck configuration, using FB loop for CV termination and ISP/ISN for CC regulation. Use Value: Integrates C/10 charge indication and open-LED protection logic - repurposes same hardware for LED and energy storage applications without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMSE#PBF | Higher VIN max (75V), no integrated PWM generator, requires external PWM source for dimming. | Better suited for ultra-high-input industrial supplies; lacks self-contained dimming capability. | Select when input exceeds 60V and external microcontroller dimming is already present. |
| LT3965EFE#PBF | 8-channel independent LED controller, 40V max VIN, I²C interface, no internal PWM generator. | Designed for multi-zone architectural lighting with digital addressability; not a drop-in replacement. | Select for distributed LED arrays requiring per-channel digital control and diagnostics. |
Compared with LTC3783EMSE#PBF and LT3965EFE#PBF, the LT3761HMSE#PBF uniquely combines 60V operation, integrated PWM dimming, and H-grade temperature qualification - making it optimal for space-constrained, high-reliability automotive LED drivers where self-contained analog/digital dimming and extended thermal margin are mandatory.
Availability
LT3761HMSE#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial LED drivers, and battery-powered portable lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3761HMSE#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3761 product line was developed by Linear Technology specifically for high-efficiency, high-reliability LED current regulation in demanding environments - emphasizing wide input range, precision current sensing, and robust fault protection for automotive and industrial applications.
FAQ
What is the maximum operating junction temperature for LT3761HMSE#PBF?
The LT3761HMSE#PBF is rated for continuous operation up to +150°C junction temperature, with thermal shutdown activating above +165°C. This H-grade qualification distinguishes it from E- and I-grade variants (max 125°C) and enables deployment in under-hood automotive locations where ambient temperatures exceed 105°C. The exposed pad (Pin 17) must be soldered to a thermal pad on the PCB to achieve this rating.
Does LT3761HMSE#PBF support synchronization to an external clock?
No, the LT3761HMSE#PBF does not support external clock synchronization. That feature is exclusive to the LT3761-1 variant (e.g., LT3761HMSE-1#PBF), which replaces the OPENLED pin with a SYNC pin. The LT3761HMSE#PBF retains the OPENLED fault indicator pin and uses only its internal oscillator, adjustable via the RT pin from 100kHz to 1MHz.
How is open-LED protection implemented in LT3761HMSE#PBF?
The LT3761HMSE#PBF implements open-LED protection by monitoring both the FB pin voltage and the ISP–ISN differential. If FB falls below VFB – 50mV (typical) *and* ISP–ISN drops below 25mV (C/10 threshold), the OPENLED pin is actively pulled low. This open-drain signal requires an external pull-up resistor (typically to INTVCC) and can drive a microcontroller interrupt or status LED. The condition is latched during PWM low periods and updated on the next PWM high edge.
Can LT3761HMSE#PBF drive LEDs in buck configuration?
Yes, the LT3761HMSE#PBF supports buck topology for LED driving, as confirmed in its official features list: "Drives LEDs in Boost, SEPIC, Inverting, Buck Mode, Buck-Boost Mode, or Flyback Configuration." In buck mode, the SENSE pin connects to the source of the low-side switch, ISP/ISN senses the LED current via a high-side sense resistor, and the FB loop regulates output voltage while the current loop maintains LED current - enabling efficient low-VF LED operation from high-input rails.
What is the purpose of the DIM/SS pin on LT3761HMSE#PBF?
The DIM/SS pin on LT3761HMSE#PBF serves two critical functions: (1) Soft-start control - its internal 12µA pull-up current charges an external capacitor to ramp up output current gradually, preventing inrush; (2) Internal PWM generator programming - the same current sets the charging/discharging currents for the PWM pin's self-oscillating circuit, determining both dimming frequency and duty ratio. A minimum 560pF capacitor to GND is required when using internal PWM dimming.
LT3761HMSE#PBF 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:
- Tube
- 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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3761HMSE#PBF FAQ
1.How can I place an order for LT3761HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761HMSE#PBF 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 LT3761HMSE#PBF reliable?
The price and inventory of LT3761HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3761HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761HMSE#PBF?
LT3761HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761HMSE#PBF 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 LT3761HMSE#PBF?
For technical support, including LT3761HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761HMSE#PBF requirements.
6.How does Aetrix verify that LT3761HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761HMSE#PBF 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 LT3761HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3761HMSE#PBF?
All LT3761HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761HMSE#PBF, 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 LT3761HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3761HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761HMSE#PBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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