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Analog Devices Inc. LT3761HMSE#TRPBF
- Part No.:
- LT3761HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761HMSE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,102
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Product details
Overview
LT3761HMSE#TRPBF from Analog Devices is a 4.5V to 60V input, constant-current/constant-voltage DC/DC controller for high-power LED drivers and battery chargers, featuring internal PWM dimming generator (4–96% duty), 100kHz–1MHz programmable switching frequency, ±3% current regulation, and rail-to-rail 0V–80V high-side/low-side current sensing - deployed in automotive headlamps and industrial LED lighting systems.
For engineers reviewing the LT3761HMSE#TRPBF datasheet, LT3761HMSE#TRPBF pinout, LT3761HMSE#TRPBF application, or LT3761HMSE#TRPBF equivalent, this page delivers verified thermal grade H-specification parameters, MSOP-16 package details, open-LED protection behavior, and true-color PWM dimming implementation guidance - all confirmed against Linear Technology's official LT3761/LT3761-1 datasheet Rev. FB.
Technical Context
The LT3761HMSE#TRPBF implements fixed-frequency current-mode control with dual-loop regulation: ISP/ISN differential sensing sets LED current via adjustable VISP–ISN threshold (242–268 mV full-scale), while FB regulates output voltage to 1.25 V ±2%. Its transconductance error amplifier (VC) integrates loop error over cycles to stabilize peak switch current demand.
Internal PWM generation uses DIM/SS pin current to set pull-up/pull-down currents on PWM pin, enabling self-oscillating dimming at 215–435 Hz with 3.1–98% duty ratio; external PWM signals support up to 3000:1 dimming ratio. The H-grade variant guarantees operation from –40°C to +150°C junction temperature with thermal shutdown at >165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V - supports direct connection to 12V/24V/48V industrial and automotive rails without pre-regulation. |
| Current Sense Range | Rail-to-rail 0V to 80V - enables high-side sensing of grounded-anode LED strings exceeding 100V total forward voltage. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to optimize efficiency, EMI, or inductor size in boost/SEPIC/flyback topologies. |
| Current Regulation Accuracy | ±3% - achieved via precision 250mV full-scale ISP–ISN threshold and low-drift CTRL scaling (0–1V linear range). |
| Thermal Grade | H-grade (–40°C to +150°C TJ) - validated for under-hood automotive and high-ambient industrial environments. |
| PWM Dimming Ratio | Up to 3000:1 - enabled by external digital PWM signal; internal generator provides 25:1 dimming with true color fidelity. |
| Shutdown Current | <1µA - ensures minimal battery drain in always-on vehicle systems when EN/UVLO is pulled low. |
Pinout & Package
LT3761HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), rated for 150°C maximum junction temperature. The exposed pad must be soldered directly to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output | Drives external 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 VFB < VFB – 50mV and VISP–ISN < 25mV. |
| ISN (3) | Negative current sense input | Completes high-side or low-side current sense path; bias current varies with CTRL voltage and ISP/ISN differential. |
| ISP (4) | Positive current sense input | Accepts up to 80V common-mode voltage; triggers overcurrent fault if VISP–ISN > 600mV (typical). |
| VC (5) | Error amplifier output | High-impedance node storing demand current state during PWM idle; requires RC compensation network for loop stability. |
| CTRL (6) | Current threshold adjust | Linearly scales VISP–ISN threshold from 21mV (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 LED thermal derating circuits. |
| PWM (8) | Digital dimming input | Accepts external PWM signal (200µA drive capability); self-oscillates when capacitor tied to GND, with duty set by DIM/SS current. |
| OPENLED (9) | Open-LED status flag | Open-drain output asserting low during open-circuit LED condition; requires external pull-up to INTVCC (LT3761 only, not LT3761-1). |
| DIM/SS (10) | Soft-start & PWM gen control | 12µA internal pull-up sets PWMOUT duty ratio; capacitor here defines soft-start time and internal dimming frequency. |
| RT (11) | Frequency programming | Resistor to GND sets oscillator frequency; 95.3kΩ yields ~100kHz, 8.87kΩ yields ~1MHz. |
| EN/UVLO (12) | Enable & undervoltage lockout | 1.22V falling threshold with 20mV hysteresis; 2.3µA pull-down enables precise external hysteresis resistor selection. |
| INTVCC (13) | Internal LDO output | 7.85V regulated supply powering GATE/PWMOUT drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC LDO and internal logic; must be bypassed with ≥0.22µF low-ESR capacitor near pin. |
| SENSE (15) | Switch current sense | Kelvin-connected to source of external N-FET; monitors switch current with 105mV (typ) current limit threshold. |
| GATE (16) | N-FET gate driver | Drives external power MOSFET between INTVCC and GND; transitions low during fault, shutdown, or PWM idle. |
| GND (17) | Ground / Exposed Pad | Primary thermal and electrical ground; serves as current sense return for SENSE pin and must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ Dimming | Preserves LED chromaticity across 3000:1 dimming range using synchronized external PWM signal - critical for automotive adaptive lighting compliance. |
| High-Voltage Current Sensing | 0V–80V rail-to-rail ISP/ISN common-mode range enables direct high-side sensing of >100V LED strings without level-shifting circuitry. |
| Integrated PWM Generator | Self-oscillating dimming engine controlled by DIM/SS current eliminates need for external timing components in basic dimming applications. |
| Open LED Protection | Dedicated OPENLED pin asserts low when FB drops below VFB – 50mV and VISP–ISN < 25mV - provides fail-safe indication for LED string breakage. |
| C/10 Charging Indicator | Monitors VISP–ISN to detect C/10 current threshold in battery charging mode - simplifies termination logic for Li-ion and supercapacitor systems. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay LED Lighting |
|---|---|
Use Scenario: Driving 60W+ white LED arrays in vehicle headlamps with adaptive beam shaping and dynamic dimming. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current to ±3% accuracy while providing 25:1 internal PWM dimming and open-LED fault reporting. Use Value: Enables AS5047-compliant headlamp systems with thermal derating via CTRL pin and robust short-circuit protection during load dump events. | Use Scenario: Powering multi-string 100–200W LED fixtures in warehouse and factory environments with wide input voltage tolerance. IC Role / Device Role / Timing Role: Configured in boost topology to regulate current into parallel LED strings from 24V–48V DC distribution rails. Use Value: Delivers 94% peak efficiency at full load and maintains regulation across –40°C to +150°C ambient via H-grade thermal specification. |
| Battery Charger for Li-ion Packs | Supercapacitor Charging System |
Use Scenario: Charging 3S–6S Li-ion battery packs in portable medical equipment requiring precise CC/CV profiles and end-of-charge signaling. IC Role / Device Role / Timing Role: Dual-loop regulator operating in constant-current mode until battery voltage reaches CV threshold, then transitioning to constant-voltage regulation via FB pin. Use Value: Integrates C/10 current detection (via ISP/ISN) to assert OPENLED pin as charge-complete signal - eliminates need for external comparator. | Use Scenario: Rapidly charging 12–48V supercapacitor banks for energy recovery systems in industrial automation and UPS backup. IC Role / Device Role / Timing Role: Constant-current source limiting inrush current during initial charge phase, then transitioning to constant-voltage regulation as capacitor voltage rises. Use Value: Uses rail-to-rail current sense inputs to monitor charging current across full 0–80V capacitor voltage range without auxiliary sensing circuitry. |
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 integrated dimming engine and open-LED flag; suited for simpler constant-current supplies where external microcontroller handles dimming. | Select when system already provides PWM timing and thermal requirements are ≤125°C. |
| LT3965EFE#PBF | 8-channel independent LED driver with I²C interface; 60V max VIN; no high-side current sense capability. | Designed for addressable RGBW lighting with digital control; not suitable for single-string high-power applications requiring >100V LED string support. | Choose for multi-zone architectural lighting with digital bus control, not for high-voltage automotive headlamp use. |
Compared with LTC3783EFE#PBF and LT3965EFE#PBF, the LT3761HMSE#TRPBF uniquely combines H-grade thermal rating, integrated PWM dimming generator, and 0–80V high-side current sensing - making it the only option among the three qualified for under-hood automotive LED driver designs requiring self-contained dimming and fault reporting.
Availability
LT3761HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial LED drivers, and battery charging systems requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LT3761HMSE#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 (including former Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving aerospace, automotive, industrial, and communications markets with precision, reliability, and thermal robustness.
The LT3761 product line was designed specifically for high-power LED driving and battery charging applications demanding wide input voltage range, accurate current regulation, and integrated protection features - with the H-grade variant targeting under-hood and high-ambient industrial deployments.
FAQ
What is the maximum junction temperature rating for LT3761HMSE#TRPBF?
The LT3761HMSE#TRPBF is an H-grade device with guaranteed operation from –40°C to +150°C junction temperature. Thermal shutdown activates above 165°C to protect the IC during overload conditions. This makes LT3761HMSE#TRPBF suitable for under-hood automotive applications where ambient temperatures exceed 125°C.
Does LT3761HMSE#TRPBF support high-side current sensing for grounded-anode LED strings?
Yes, LT3761HMSE#TRPBF supports true high-side current sensing with 0V to 80V rail-to-rail common-mode voltage range on ISP and ISN pins. This allows direct sensing of current in grounded-anode LED strings exceeding 100V total forward voltage - a key capability confirmed in the LT3761 datasheet Figure 1 and Pin Functions section.
How does the internal PWM dimming generator work on LT3761HMSE#TRPBF?
The LT3761HMSE#TRPBF uses the DIM/SS pin current to program internal pull-up and pull-down currents on the PWM pin. With a capacitor from PWM to GND, this creates a self-oscillating dimming signal at 215–435 Hz with duty ratio adjustable from 3.1% to 98% - eliminating external timing components while preserving true-color fidelity per Analog Devices' True Color PWM™ specification.
What protection features are implemented in LT3761HMSE#TRPBF?
LT3761HMSE#TRPBF includes open-LED detection (via OPENLED pin assertion), output short-circuit protection (GATE/PWMOUT forced low), overcurrent shutdown (ISP–ISN > 600mV), FB overvoltage clamp (PWMOUT toggle), thermal shutdown (>165°C), and C/10 charge termination monitoring - all documented in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Can LT3761HMSE#TRPBF operate in buck, boost, and SEPIC configurations?
Yes, LT3761HMSE#TRPBF is explicitly designed to drive LEDs in boost, SEPIC, inverting, buck, buck-boost, and flyback configurations - as stated in the Features section of the datasheet. Its current-mode architecture and flexible feedback structure (dual ISP/ISN and FB loops) enable stable operation across all these topologies without modification to the IC itself.
LT3761HMSE#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 ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3761HMSE#TRPBF FAQ
1.How can I place an order for LT3761HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761HMSE#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 LT3761HMSE#TRPBF reliable?
The price and inventory of LT3761HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3761HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761HMSE#TRPBF?
LT3761HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761HMSE#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 LT3761HMSE#TRPBF?
For technical support, including LT3761HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3761HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3761HMSE#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 LT3761HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3761HMSE#TRPBF?
All LT3761HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761HMSE#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 LT3761HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3761HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761HMSE#TRPBF Tags
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