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Analog Devices Inc. LT3761AEMSE#PBF
- Part No.:
- LT3761AEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3761AEMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:644
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Product details
Overview
LT3761AEMSE#PBF from Analog Devices (formerly Linear Technology) is a 4.5V–60V input, constant-frequency current-mode DC/DC controller optimized for high-current LED driving in boost, SEPIC, buck-boost, inverting, and flyback topologies. It delivers ±3% constant-current regulation and ±2% constant-voltage regulation, features internal PWM dimming with 4%–96% programmable duty cycle, and supports up to 3000:1 True Color PWM™ dimming when driven externally. It is widely deployed in automotive headlamp systems requiring robust open-LED protection and high-side current sensing.
For engineers reviewing the LT3761AEMSE#PBF datasheet, LT3761AEMSE#PBF pinout, LT3761AEMSE#PBF application, or LT3761AEMSE#PBF equivalent, key selection considerations include its rail-to-rail current sense range (0V–80V), 100kHz–1MHz adjustable switching frequency, integrated C/10 battery charge indication, and thermally enhanced 16-lead MSOP package with exposed GND pad.
Technical Context
The LT3761AEMSE#PBF implements a fixed-frequency, current-mode control architecture with dual-loop capability: a current-sense loop (via ISP/ISN) for constant-current regulation and a voltage-feedback loop (via FB) for constant-voltage operation or LED open-circuit detection. Its transconductance error amplifier (VC) integrates over switching cycles to set peak switch current, while slope compensation ensures stability across wide VIN/VOUT ranges.
It integrates a programmable internal PWM generator (47nF capacitor on PWM pin yields ~300Hz output), soft-start via DIM/SS pin with 14µA pull-up current, and fault protection including ISP/ISN overcurrent (600mV threshold), FB overvoltage (VFB + 60mV), and OPENLED reporting (VFB – 50mV + low VISP-ISN). The GATE driver operates from INTVCC (7.85V regulated) and supports fast rise/fall times (25ns typical into 3300pF).
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 grounded-anode LED strings >100V without level-shifting circuitry. |
| Constant Current Accuracy | ±3% - ensures precise LED brightness control across temperature and line variations, critical for automotive lighting compliance. |
| Switching Frequency | 100kHz to 1MHz - adjustable via RT resistor to balance EMI, efficiency, and external component size (e.g., 95.3kΩ sets 350kHz). |
| Internal PWM Dimming | 4% to 96% duty ratio - programmable via DIM/SS current; improves dimming linearity vs. LT3761 baseline with tighter accuracy. |
| Open LED Detection | VFB – 50mV threshold with C/10 confirmation (25mV VISP-ISN) - latched OPENLED assertion prevents false triggers during transient load changes. |
| INTVCC Regulator | 7.85V ±0.2V, 36mA current limit - powers gate driver and internal logic; dropout <390mV at –10mA enables stable operation even near VIN minimum. |
Pinout & Package
LT3761AEMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4mm) with exposed GND pad (Pin 17) that must be soldered to PCB for thermal and electrical performance. 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 FET; toggles low if FB > VFB + 60mV - isolates LED load during overvoltage events. |
| FB (2) | Voltage feedback input | Sets constant-voltage regulation point at 1.25V; enables open-LED detection when combined with low VISP-ISN (<25mV). |
| ISN (3) | Negative current sense input | Kelvin-connected to low side of sense resistor; bias current varies with CTRL voltage - enables accurate high-side sensing. |
| ISP (4) | Positive current sense input | Kelvin-connected to high side of sense resistor; overcurrent detected if VISP–ISN > 600mV - shuts down GATE/PWMOUT. |
| VC (5) | Error amplifier output | High-impedance during PWM low; stores demand state on external RC network for seamless PWM dimming transitions. |
| CTRL (6) | Current threshold adjustment | 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 networks. |
| PWM (8) | Digital dimming input / self-oscillator enable | Accepts external PWM signal (200µA drive capability); with capacitor to GND, generates internal dimming waveform at frequency set by DIM/SS current. |
| OPENLED (9) | Open-drain fault status output | Latches open-LED condition; requires external pull-up to INTVCC; asserts only when PWM is high and FB < VFB – 50mV. |
| DIM/SS (10) | Soft-start / PWM generator programming | 14µA internal pull-up sets PWMOUT duty ratio; capacitor to GND defines soft-start time and dimming frequency. |
| RT (11) | Frequency adjustment | Resistor to GND programs oscillator from 100kHz–1MHz; values specified in datasheet curves (e.g., 95.3kΩ → 350kHz). |
| 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) | Internally regulated supply | 7.85V LDO output; powers GATE/PWMOUT drivers; requires 1µF ceramic bypass close to pin and exposed pad. |
| VIN (14) | Main power input | Supplies INTVCC regulator and internal logic; requires local 0.22µF low-ESR ceramic bypass to exposed GND pad. |
| SENSE (15) | Switch current sense input | Kelvin-connected to source of external NFET; monitors switch current for current-mode control and overcurrent protection. |
| GATE (16) | N-channel MOSFET driver output | Swings between INTVCC and GND; 25ns rise/fall into 3300pF; driven low during shutdown/fault/idle. |
| GND (17) | Power and signal ground | Exposed pad; serves as Kelvin return for SENSE, ISN, and current sense resistor - must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 external dimming ratio with no color shift - achieved via synchronous PWM gating of constant-current source, not analog current reduction. |
| Rail-to-rail current sense | 0V to 80V common-mode range on ISP/ISN - eliminates need for level shifters in high-voltage LED string applications (>100V). |
| Integrated C/10 charge indication | Asserts OPENLED when VISP-ISN drops below 25mV during battery charging - provides reliable end-of-charge signal without external comparators. |
| Output short-circuit protected boost | Automatic hiccup mode on ISP–ISN > 600mV - limits average power dissipation and prevents thermal runaway during sustained short circuits. |
| Thermally enhanced MSOP | 16-lead MSOP with exposed GND pad (θJC = 4°C/W) - enables >3W continuous power dissipation in compact 3mm × 4mm footprint. |
| Programmable internal PWM generator | Duty ratio tunable from 4% to 96% via DIM/SS current - improves dimming linearity and eliminates need for external oscillator in cost-sensitive designs. |
Applications
| Automotive Headlamps | Battery Charging Systems |
|---|---|
Use Scenario: High-intensity LED headlamp module in 12V/24V vehicle platforms requiring adaptive driving beam (ADB) and dynamic dimming. IC Role / Device Role / Timing Role: Constant-current LED driver in boost configuration with True Color PWM™ dimming and open-LED fault reporting. Use Value: Delivers 94% efficiency at 60W output, supports 25:1 internal dimming for glare-free ADB, and meets ISO 11452-2 EMI requirements via adjustable 350kHz switching. |
Use Scenario: Li-ion or lead-acid battery charger for industrial UPS or portable medical equipment with C/10 termination and voltage regulation. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller using FB for voltage regulation and ISP/ISN for current limiting. Use Value: Uses built-in C/10 threshold (25mV VISP-ISN) to assert OPENLED as charge-complete signal; eliminates external comparator and reduces BOM count by 3 components. |
| Industrial LED Lighting | High-Voltage Capacitor Charging |
Use Scenario: Outdoor streetlight with 72V LED string powered from 48V DC microgrid, requiring surge immunity and thermal derating. IC Role / Device Role / Timing Role: SEPIC-mode LED driver with CTRL-based analog dimming and VREF-referenced thermal foldback. Use Value: Rail-to-rail 0V–80V ISP/ISN sensing enables direct 72V string drive; CTRL pin allows linear dimming from 0–100% while maintaining ±3% current accuracy. |
Use Scenario: Precision charging of supercapacitors in energy harvesting systems where voltage ramp rate and end-point accuracy are critical. IC Role / Device Role / Timing Role: Constant-current voltage regulator in buck-boost topology with FB loop controlling capacitor voltage and ISP/ISN limiting charge current. Use Value: ±2% FB regulation accuracy ensures precise 2.7V or 5.5V capacitor endpoint; programmable UVLO prevents charging below safe cell voltage thresholds. |
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 (100V), no integrated PWM generator, requires external oscillator for dimming | Better suited for ultra-high-voltage LED strings (>80V) but lacks internal dimming engine and C/10 indication | Select when input exceeds 60V or when external PWM timing control is preferred over integrated generator |
| LT3965EFE#PBF | 4-channel synchronized LED controller, fixed 200kHz–2MHz frequency, no C/10 function, different package (28-pin TSSOP) | Designed for multi-string RGBW lighting with channel-to-channel current matching; not single-string optimized | Select for multi-LED array systems requiring independent per-channel dimming and synchronization |
Compared with LTC3783EMSE#PBF and LT3965EFE#PBF, the LT3761AEMSE#PBF uniquely combines 60V operation, internal PWM dimming, C/10 charge indication, and rail-to-rail current sensing in a compact MSOP - making it optimal for cost-sensitive, single-string automotive and industrial LED drivers where integration reduces layout complexity and component count.
Availability
LT3761AEMSE#PBF is available at Aetrix Electronics and suitable for automotive lighting, battery charging, and industrial LED driver designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3761AEMSE#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear ICs, including rigorous qualification and long-term product support.
The LT3761AEMSE#PBF belongs to Linear's high-voltage LED controller product line, designed specifically for robust, high-efficiency constant-current power conversion in demanding environments such as automotive exterior lighting and industrial power supplies.
FAQ
What is the maximum input voltage rating for the LT3761AEMSE#PBF?
The LT3761AEMSE#PBF has an absolute maximum VIN rating of 60V, with guaranteed operation from 4.5V to 60V. This makes it suitable for 12V and 24V automotive systems, including cold-crank conditions down to 4.5V. Exceeding 60V on VIN may cause permanent damage per Absolute Maximum Ratings.
How does the LT3761AEMSE#PBF achieve 3000:1 PWM dimming?
The LT3761AEMSE#PBF achieves 3000:1 True Color PWM™ dimming by accepting an external digital PWM signal at the PWM pin capable of sourcing/sinking 200µA. This signal directly gates the constant-current source without modulating analog current, preserving LED color fidelity across the full dimming range.
Can the LT3761AEMSE#PBF drive grounded-anode LED configurations?
Yes - the LT3761AEMSE#PBF supports grounded-anode LEDs via high-side current sensing using the ISP and ISN pins, which feature a 0V–80V rail-to-rail common-mode range. This eliminates the need for level-shifters or floating supplies in high-voltage LED string applications.
What protection features are integrated into the LT3761AEMSE#PBF?
The LT3761AEMSE#PBF integrates open-LED detection (via FB and VISP-ISN thresholds), ISP/ISN overcurrent shutdown (600mV), FB overvoltage protection (VFB + 60mV), thermal shutdown (>165°C), and output short-circuit hiccup mode - all without requiring external components.
Is the LT3761AEMSE#PBF pin-compatible with the original LT3761?
No - the LT3761AEMSE#PBF is an enhanced revision with improved internal PWM dimming accuracy and updated specifications, but it retains identical pinout, package, and functional compatibility with the LT3761. It is a direct drop-in replacement with superior dimming linearity.
LT3761AEMSE#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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3761AEMSE#PBF FAQ
1.How can I place an order for LT3761AEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3761AEMSE#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 LT3761AEMSE#PBF reliable?
The price and inventory of LT3761AEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3761AEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3761AEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3761AEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3761AEMSE#PBF?
LT3761AEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3761AEMSE#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 LT3761AEMSE#PBF?
For technical support, including LT3761AEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3761AEMSE#PBF requirements.
6.How does Aetrix verify that LT3761AEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3761AEMSE#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 LT3761AEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3761AEMSE#PBF?
All LT3761AEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3761AEMSE#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 LT3761AEMSE#PBF part is unused and in its original packaging.
Return procedure for LT3761AEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3761AEMSE#PBF Tags
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