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Analog Devices Inc. LT3755JMSE-2#TRPBF
- Part No.:
- LT3755JMSE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3755JMSE-2#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
LT3755JMSE-2#TRPBF from Analog Devices is a constant-frequency, current-mode DC/DC LED controller driving external N-channel MOSFETs in boost, buck, buck-boost, SEPIC, or flyback topologies. It delivers up to 75V output, supports 4.5V–40V input, provides 100mV high-side current sensing, enables 3000:1 PWM dimming, and operates with AEC-Q100 qualification for automotive headlamp drivers.
For engineers reviewing the LT3755JMSE-2#TRPBF datasheet, LT3755JMSE-2#TRPBF pinout, LT3755JMSE-2#TRPBF application, or LT3755JMSE-2#TRPBF equivalent, key selection criteria include its J-grade (–40°C to +150°C) thermal rating, MSOP-16 package with exposed pad, open LED protection via OPENLED pin, adjustable 100kHz–1MHz switching frequency, and dual regulation capability (constant-current and constant-voltage).
Technical Context
The LT3755JMSE-2#TRPBF implements a fixed-frequency current-mode control architecture with internal 7.15V INTVCC regulator powering gate and PWMOUT drivers. Its high-side current sense inputs (ISP/ISN) support flexible topology configuration and enable accurate LED current regulation independent of output voltage polarity.
It integrates dedicated protection circuitry including open LED detection (FB threshold –50mV), short-circuit detection (ISP–ISN >150mV when ISN <3V), programmable undervoltage lockout with hysteresis, and thermal shutdown at 165°C. The CTRL pin adjusts current sense threshold from 0V to 1.1V, enabling analog dimming and temperature compensation.
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 conditions. |
| Output Voltage Capability | Up to 75V - enables driving long LED strings in automotive headlamps and industrial lighting. |
| Current Sense Threshold | 100mV (typical) - sets LED current via external sense resistor; J-grade ensures stability across –40°C to +150°C. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT pin resistor; allows optimization of efficiency, EMI, and magnetics size. |
| Operating Junction Temp | –40°C to +150°C - J-grade qualification enables use in under-hood automotive environments. |
| Dimming Ratio | 3000:1 PWM - achieves precise color-stable brightness control without flicker in display and lighting systems. |
| Package | 16-Lead MSOP with exposed pad - thermally enhanced for high-power LED driver applications; requires soldered GND pad. |
Pinout & Package
LT3755JMSE-2#TRPBF uses a 16-lead plastic MSOP package (3mm × 4.9mm) with exposed thermal pad (Pin 17 = GND). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output | Drives NMOS disconnect switch; toggles low during FB overvoltage (>VFB +60mV) to protect LEDs. |
| FB (Pin 2) | Voltage feedback input | Regulates output voltage to 1.25V; triggers OPENLED pull-down when below VFB –50mV (open LED fault). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; enables short-circuit detection when ISN <3V and ISP–ISN >150mV. |
| ISP (Pin 4) | Positive current sense input | High-side current sense high terminal; bias current varies with CTRL voltage per datasheet TPC. |
| VC (Pin 5) | Error amplifier output | Integrates error signal for loop stability; high-impedance during PWM low to retain state. |
| CTRL (Pin 6) | Current threshold adjust | Sets LED current sense threshold: 100mV (VCTRL ≥1.2V); linear scaling (0.1×VCTRL) below 1V. |
| VREF (Pin 7) | 2.0V reference output | Supplies ≤100µA; used to bias CTRL divider for analog dimming or thermal compensation. |
| PWM (Pin 8) | Digital dimming input | Active-low shutdown; disables oscillator, forces GATE/PWMOUT low, and resets soft-start. |
| OPENLED (Pin 9) | Open LED status output | Open-collector pull-down asserted when FB < VFB –50mV; latched during PWM low. |
| SS (Pin 10) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets ramp time; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets oscillator frequency; 100kΩ yields ~375kHz (see Fig. G07). |
| SHDN/UVLO (Pin 12) | Shutdown & UVLO input | 1.159V falling threshold (J-grade); hysteresis set by external divider and 2.1µA internal pull-down. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply for gate driver; requires 4.7µF ceramic bypass; UVLO at 4.1V protects FETs. |
| VIN (Pin 14) | Main power input | 4.5V–40V operation; local 0.22µF+ ceramic bypass required; powers INTVCC LDO. |
| SENSE (Pin 15) | Low-side current sense | Kelvin-connected to source of external sense resistor; limits peak switch current at 108mV (typ). |
| GATE (Pin 16) | MOSFET gate driver | Drives external N-FET between INTVCC and GND; fast rise/fall (<35ns into 3.3nF). |
| Exposed Pad (Pin 17) | Thermal & electrical GND | Must be soldered to PCB ground plane; serves as current sense return path. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost/SEPIC/flyback) without ground-referenced LED string constraints. |
| AEC-Q100 qualified (J-grade) | Validated for automotive under-hood operation from –40°C to +150°C junction temperature. |
| Integrated open LED protection | OPENLED pin asserts when FB drops below VFB –50mV, providing fault signaling without external circuitry. |
| Programmable switching frequency | 100kHz–1MHz via RT pin resistor - balances efficiency, EMI, and magnetic component size. |
| Dual regulation mode | Simultaneous constant-current (via ISP/ISN) and constant-voltage (via FB) control with priority logic. |
| Low shutdown current | <1µA shutdown IQ - preserves battery life in always-on automotive lighting systems. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 50W white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current LED controller regulating 1.5A string current at up to 75V with 3000:1 PWM dimming. Use Value: J-grade thermal rating ensures reliable operation at 150°C junction temperature under hood; OPENLED fault reporting enables ASIL-B compliant diagnostics. | Use Scenario: Powering multi-string 100W+ LED fixtures in warehouse and factory environments with 0–10V analog dimming. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver supporting universal 90–305VAC input via offline PFC front-end. Use Value: 40V max input withstands 305VAC rectified surges; 100mV current sense enables ±3% LED current accuracy over line/load/temp. |
| Battery-Powered Emergency Lighting | Medical Surgical Lighting |
Use Scenario: LED driver for UL924-compliant emergency exit signs powered by 12V/24V lead-acid or LiFePO₄ batteries. IC Role / Device Role / Timing Role: Boost-mode controller delivering regulated 48V to parallel LED strings with automatic test-mode activation. Use Value: 4.5V min VIN supports deep battery discharge down to 10.5V; programmable UVLO prevents battery over-discharge. | Use Scenario: Precision dimmable light engine for shadowless surgical lamps requiring flicker-free, color-stable illumination. IC Role / Device Role / Timing Role: Dual-loop controller maintaining constant current (±0.5%) while suppressing 100Hz ripple via FB feedback. Use Value: 3000:1 true-color PWM dimming eliminates chromatic shift; CTRL pin enables smooth 0–10V analog dimming integration. |
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#TRPBF | Same pinout, identical J-grade temp range, but adds spread-spectrum frequency modulation for lower EMI. | Better suited for EMI-sensitive medical or avionics lighting where conducted emissions must meet CISPR-25 Class 5. | Select LT3756IMSE-2#TRPBF if EMI reduction is prioritized over cost; otherwise LT3755JMSE-2#TRPBF offers proven reliability at lower BOM cost. |
| LM3410XSDX/NOPB | Single-stage buck-only controller; 32V max VIN; no high-side sensing; no OPENLED pin; not AEC-Q100 qualified. | Limited to low-voltage LED strips (<32V) in non-automotive consumer lighting with basic protection only. | Choose LM3410XSDX/NOPB only for cost-sensitive, non-automotive, low-power (<25W) applications where topology and qualification requirements are relaxed. |
Compared with LT3756IMSE-2#TRPBF, LT3755JMSE-2#TRPBF lacks spread-spectrum modulation but maintains identical thermal, dimming, and protection specs; versus LM3410XSDX/NOPB, it supports higher voltage, multiple topologies, and automotive qualification - making it the only viable option for 50W+ AEC-Q100-compliant headlamp designs.
Availability
LT3755JMSE-2#TRPBF is available at Aetrix Electronics and suitable for automotive LED headlamps, industrial high-bay lighting, and battery-powered emergency lighting requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for LT3755JMSE-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3755 family is designed specifically for high-power, high-reliability LED driver applications demanding wide input range, flexible topology support, and robust fault protection - especially in automotive lighting systems.
FAQ
What is the maximum operating junction temperature for LT3755JMSE-2#TRPBF?
The LT3755JMSE-2#TRPBF is rated for a maximum junction temperature of +150°C, consistent with its J-grade qualification per AEC-Q100. This specification is validated across the full –40°C to +150°C operating range and enables deployment in under-hood automotive environments where ambient temperatures exceed 105°C. Thermal derating above 125°C is recommended for long-term reliability.
How does the OPENLED pin function on LT3755JMSE-2#TRPBF?
The OPENLED pin on LT3755JMSE-2#TRPBF is an open-collector output that pulls down when the FB pin voltage falls below VFB –50mV (typical), indicating an open LED string. It remains latched during PWM low periods and updates when PWM goes high. This feature provides real-time fault signaling without external comparators, and is specific to LT3755 and LT3755-2 variants - absent in LT3755-1.
Can LT3755JMSE-2#TRPBF operate in buck mode with high-side current sensing?
Yes, LT3755JMSE-2#TRPBF supports buck-mode operation using high-side current sensing via ISP/ISN pins. This configuration isolates the LED string from ground, enabling direct connection to chassis ground in automotive systems and simplifying EMI filtering. The controller maintains constant-current regulation regardless of topology, and the 100mV sense threshold ensures accuracy across the full J-grade temperature range.
What is the purpose of the CTRL pin on LT3755JMSE-2#TRPBF?
The CTRL pin on LT3755JMSE-2#TRPBF adjusts the LED current sense threshold: for VCTRL ≥1.2V, the threshold is fixed at 100mV; for 0V < VCTRL < 1V, it scales linearly as 0.1×VCTRL. This enables analog dimming, temperature compensation (e.g., using NTC bias from VREF), and current derating. Leaving CTRL unconnected is prohibited - it must be tied to a defined voltage or grounded.
Is LT3755JMSE-2#TRPBF pin-compatible with other LT3755 variants in MSOP package?
Yes, LT3755JMSE-2#TRPBF shares identical MSOP-16 pinout and footprint with all LT3755-xMSE variants (e.g., LT3755EMSE-2#TRPBF, LT3755IMSE-2#TRPBF). Functionally, it matches LT3755-2 specifications - including OPENLED pin behavior and J-grade thermal rating - but differs from LT3755-1 (which substitutes SYNC for OPENLED) and base LT3755 (no -1/-2 suffix).
LT3755JMSE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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):
- 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#TRPBF FAQ
1.How can I place an order for LT3755JMSE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3755JMSE-2#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 LT3755JMSE-2#TRPBF reliable?
The price and inventory of LT3755JMSE-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3755JMSE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3755JMSE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3755JMSE-2#TRPBF?
LT3755JMSE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3755JMSE-2#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 LT3755JMSE-2#TRPBF?
For technical support, including LT3755JMSE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3755JMSE-2#TRPBF requirements.
6.How does Aetrix verify that LT3755JMSE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3755JMSE-2#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 LT3755JMSE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3755JMSE-2#TRPBF?
All LT3755JMSE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3755JMSE-2#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 LT3755JMSE-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3755JMSE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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