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Analog Devices Inc. LT3755JMSE-2#PBF
- Part No.:
- LT3755JMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3755JMSE-2#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,686
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Product details
Overview
LT3755JMSE-2#PBF from Analog Devices is a high-voltage, constant-current LED controller optimized for automotive headlamp and industrial high-power lighting. It operates from 4.5V to 40V input, delivers up to 75V output, supports 3000:1 PWM dimming, drives external N-channel MOSFETs via 7.15V gate drive, and features high-side current sensing for boost/buck/buck-boost topologies.
For engineers reviewing the LT3755JMSE-2#PBF datasheet, LT3755JMSE-2#PBF pinout, LT3755JMSE-2#PBF application, or LT3755JMSE-2#PBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, 100mV high-side current sense threshold, open LED protection with OPENLED status pin, and programmable 100kHz–1MHz switching frequency.
Technical Context
The LT3755JMSE-2#PBF implements fixed-frequency current-mode control with internal 7.15V LDO for gate driver and logic supply. Its dual-loop architecture simultaneously regulates LED current via ISP/ISN differential sensing (100mV full-scale) and output voltage via FB pin (1.25V reference), with priority logic preventing overvoltage during open-circuit faults.
It integrates dedicated protection circuitry: OPENLED pin asserts when FB falls 50mV below regulation threshold (indicating open LED), while PWMOUT forces low if FB exceeds regulation by 60mV (overvoltage shutdown). The CTRL pin enables analog dimming by scaling the current sense threshold from 0V to 1.1V, and RT pin sets oscillator frequency with external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery range including cold-crank and load-dump transients. |
| Output Voltage Capability | Up to 75V - enables driving long LED strings in boost configuration without cascading stages. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side current sensing with minimal power dissipation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT pin to balance efficiency, EMI, and magnetic component size. |
| Operating Junction Temp | –40°C to +150°C - J-grade rating meets AEC-Q100 Grade 0 requirements for under-hood automotive use. |
| Open LED Detection | FB threshold = VFB – 50mV - provides reliable fault reporting without external comparators or timing delays. |
| Shutdown Current | <1µA - enables ultra-low power standby in always-on vehicle systems. |
Pinout & Package
LT3755JMSE-2#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) soldered to PCB ground for thermal and electrical integrity. Pin count and layout match industry-standard MSOP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 11) | Buffered PWM output / Overvoltage fault signal | Drives NMOS disconnect switch; forced low during FB overvoltage (>VFB+60mV) to isolate LED string. |
| FB (Pin 12) | Voltage feedback input | Regulates output voltage to 1.25V reference; triggers OPENLED assertion when < VFB–50mV (open LED). |
| ISN (Pin 13) | Negative current sense input | High-side current sense return; enables short-circuit detection when ISN < 3V and ISP–ISN > 150mV. |
| ISP (Pin 14) | Positive current sense input | High-side current sense input; common-mode range extends to 75V for boost topology compatibility. |
| VC (Pin 15) | Error amplifier output | Integrates current/voltage loop error; high-impedance during PWM low to retain state across dimming cycles. |
| CTRL (Pin 16) | Analog dimming control | Scales current sense threshold from 0V to 1.1V; enables 10:1 analog dimming alongside 3000:1 PWM dimming. |
| VREF (Pin 1) | 2.0V precision reference | Stable 2.0V output (±2% over temp); supplies bias for CTRL divider and temperature compensation networks. |
| PWM (Pin 2) | Digital dimming input | Active-high enable; internal pull-down allows direct MCU GPIO connection without external resistor. |
| OPENLED (Pin 3) | Open LED status indicator | Open-collector output; pulls low when FB < VFB–50mV - signals microcontroller or dashboard warning system. |
| SS (Pin 4) | Soft-start timing input | 10µA internal current source charges external capacitor; controls ramp rate of VC and oscillator startup. |
| RT (Pin 5) | Frequency programming input | Resistor-to-GND sets oscillator frequency; 100kΩ yields ~375kHz, enabling optimal trade-off between efficiency and EMI. |
| SHDN/UVLO (Pin 6) | Enable & undervoltage lockout | 1.22V falling threshold with programmable hysteresis; resets soft-start and disables GATE/PWMOUT on brownout. |
| INTVCC (Pin 7) | Internal 7.15V regulator output | Supplies gate driver and logic; requires 4.7µF ceramic bypass close to pin; UVLO protects FETs if INTVCC < 4.1V. |
| VIN (Pin 8) | Main input supply | Accepts 4.5V–40V; must be bypassed with ≥0.22µF ceramic capacitor near IC for stability and transient response. |
| SENSE (Pin 9) | Low-side current sense input | Kelvin-connected to source of external sense resistor; used only in buck/buck-boost configurations (not high-side). |
| GATE (Pin 10) | N-channel MOSFET driver output | Swings rail-to-rail between INTVCC and GND; capable of driving QG ≤ 50nC FETs at 1MHz with fast rise/fall times (~35ns). |
| Exposed Pad (Pin 17) | Thermal & electrical ground | Must be soldered to PCB ground plane; provides primary thermal path and low-inductance return for high-side sensing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (Grade 0) | Validated for automotive under-hood operation up to 150°C junction temperature with zero defects per billion hours MTBF. |
| High-side current sensing | Enables flexible topology selection (boost, buck, buck-boost, SEPIC, flyback) without compromising ground-referenced LED cathode. |
| True Color PWM™ dimming | 3000:1 dimming ratio preserves LED color point across full brightness range - critical for automotive adaptive front lighting (AFS). |
| Integrated open LED & overvoltage protection | Dual-threshold FB monitoring (VFB–50mV and VFB+60mV) eliminates need for external fault comparators and reduces BOM count. |
| Programmable soft-start | External capacitor on SS pin controls inrush current and prevents output overshoot during cold-start or hot-plug conditions. |
| Low shutdown IQ & fast wake-up | <1µA shutdown current enables always-on vehicle modules; resumes regulation within microseconds after PWM assertion. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 50W white LED arrays in adaptive front-lighting systems requiring dynamic beam shaping and instant dimming. IC Role / Device Role / Timing Role: Constant-current controller managing high-side sensed LED current while coordinating with vehicle CAN bus for real-time dimming commands. Use Value: AEC-Q100 qualification ensures reliability in under-hood environments; 3000:1 PWM dimming enables smooth glare-free transitions between low/high beams. |
Use Scenario: Powering multi-string 100W+ LED fixtures in warehouse and factory settings with 0–10V or DALI dimming interfaces. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating constant current across parallel LED strings with integrated open-circuit fault detection. Use Value: 75V output capability supports long LED strings without intermediate converters; programmable frequency minimizes audible noise in quiet industrial zones. |
| Battery-Powered Emergency Lighting | UV-C LED Disinfection Systems |
|
Use Scenario: Maintaining regulated LED current during lithium-ion battery discharge from 4.2V down to 3.0V cutoff in exit sign and egress lighting. IC Role / Device Role / Timing Role: Wide-input buck-boost controller delivering stable current despite collapsing input voltage, with automatic fallback to constant-voltage mode. Use Value: 4.5V minimum VIN enables operation down to deeply discharged batteries; <1µA shutdown current extends backup runtime significantly. |
Use Scenario: Driving high-efficiency 275nm UV-C LEDs requiring precise current regulation and thermal derating to maintain germicidal efficacy. IC Role / Device Role / Timing Role: Constant-current source with CTRL-based analog dimming for intensity control and thermal foldback based on external NTC feedback to VREF/CTRL network. Use Value: High-side sensing avoids ground loop interference in isolated UV chamber designs; 100mV sense threshold minimizes power loss and heat generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IMSE-2#PBF | Higher 60V ISP/ISN common-mode range (vs 75V), identical pinout and feature set; rated for –40°C to 125°C (I-grade only). | Lacks J-grade 150°C rating; suitable for non-under-hood industrial lighting but not automotive engine bay deployment. | Select when AEC-Q100 and 150°C operation are unnecessary - offers cost advantage with same layout compatibility. |
| LM3410XMY/NOPB | Single-ended boost-only controller; no high-side sensing, no OPENLED status, no CTRL analog dimming; 40V max VIN. | Designed for low-power portable LED flashlights; lacks fault reporting, thermal robustness, and topology flexibility. | Choose only for cost-sensitive, low-power (<10W), non-automotive applications where simplified design outweighs missing safety features. |
Compared with LT3755JMSE-2#PBF, LT3756IMSE-2#PBF shares identical functionality but sacrifices automotive temperature rating and absolute maximum ISP/ISN voltage, while LM3410XMY/NOPB omits critical protections and dimming modes required for high-reliability lighting systems.
Availability
LT3755JMSE-2#PBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay luminaires, and battery-backed emergency lighting requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LT3755JMSE-2#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT3755 family was designed specifically for high-reliability, high-power LED lighting systems demanding precise current regulation, robust fault protection, and automotive-grade thermal performance - exemplified by the LT3755JMSE-2#PBF's J-grade 150°C rating and AEC-Q100 qualification.
FAQ
What is the maximum operating junction temperature for LT3755JMSE-2#PBF?
The LT3755JMSE-2#PBF is rated for a maximum junction temperature of +150°C, meeting AEC-Q100 Grade 0 requirements. This J-grade specification ensures reliable operation in under-hood automotive environments where ambient temperatures exceed 105°C. Thermal derating curves in the datasheet define safe operating area limits above 125°C, and the exposed pad must be soldered to a sufficient copper area to maintain θJA ≤ 43°C/W.
Does LT3755JMSE-2#PBF support both constant-current and constant-voltage regulation?
Yes, LT3755JMSE-2#PBF supports dual-loop regulation: constant-current via ISP/ISN differential sensing (100mV threshold) and constant-voltage via FB pin (1.25V reference). The two loops interact - current regulation dominates during normal operation, while voltage regulation activates during open-LED faults to prevent overvoltage. Connecting FB to GND disables voltage regulation entirely, forcing pure constant-current mode.
How does the OPENLED pin function on LT3755JMSE-2#PBF?
The OPENLED pin on LT3755JMSE-2#PBF is an open-collector output that pulls low when the FB voltage drops below VFB – 50mV (typically 1.20V), indicating an open LED string. It requires an external pull-up resistor (<1mA current) and latches its state during PWM low periods. Unlike the LT3755-1 variant, LT3755JMSE-2#PBF retains this dedicated fault pin instead of SYNC, making it ideal for safety-critical lighting diagnostics.
Can LT3755JMSE-2#PBF drive a buck-boost LED topology?
Yes, LT3755JMSE-2#PBF explicitly supports buck-boost, boost, buck, SEPIC, and flyback topologies due to its high-side current sensing architecture. In buck-boost mode, ISP connects to the LED anode, ISN connects to the current sense resistor's high-side terminal, and the converter regulates LED current regardless of whether output voltage is higher or lower than input. Layout must maintain Kelvin connections to minimize noise coupling into the 100mV sense node.
What is the purpose of the CTRL pin on LT3755JMSE-2#PBF?
The CTRL pin on LT3755JMSE-2#PBF adjusts the current sense threshold from 0V to 1.1V: below 1V, threshold scales linearly as (VCTRL – 100mV)/10•RLED; above 1.2V, it holds at full-scale 100mV. This enables analog dimming that complements 3000:1 PWM dimming, allowing smooth brightness control without color shift. A resistor divider from VREF (2.0V) to GND sets the analog dimming range, and CTRL must never be left floating.
LT3755JMSE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3755JMSE-2#PBF FAQ
1.How can I place an order for LT3755JMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3755JMSE-2#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 LT3755JMSE-2#PBF reliable?
The price and inventory of LT3755JMSE-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3755JMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3755JMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3755JMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3755JMSE-2#PBF?
LT3755JMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3755JMSE-2#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 LT3755JMSE-2#PBF?
For technical support, including LT3755JMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3755JMSE-2#PBF requirements.
6.How does Aetrix verify that LT3755JMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3755JMSE-2#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 LT3755JMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3755JMSE-2#PBF?
All LT3755JMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3755JMSE-2#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 LT3755JMSE-2#PBF part is unused and in its original packaging.
Return procedure for LT3755JMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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