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Analog Devices Inc. LT3756IMSE-1#TRPBF
- Part No.:
- LT3756IMSE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE-1#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,055
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Product details
Overview
LT3756IMSE-1#TRPBF from Analog Devices is a constant-current, constant-voltage DC/DC LED controller designed for high-power automotive and industrial lighting. It drives external N-channel MOSFETs in boost, buck, buck-boost, SEPIC, or flyback topologies; supports 6V–100V input, up to 100V output, 100mV high-side current sense threshold, and 100kHz–1MHz adjustable switching frequency. Used in 30W white LED headlamp drivers with 3000:1 PWM dimming.
For engineers reviewing the LT3756IMSE-1#TRPBF datasheet, LT3756IMSE-1#TRPBF pinout, LT3756IMSE-1#TRPBF application, or LT3756IMSE-1#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, frequency synchronization capability (LT3756-1 variant), open LED protection, programmable undervoltage lockout with hysteresis, and thermally enhanced 16-lead MSOP package rated for –40°C to 125°C.
Technical Context
The LT3756IMSE-1#TRPBF implements fixed-frequency current-mode control with internal 7.15V regulated INTVCC supply for gate driving. Its high-side current sensing architecture enables flexible topology selection and eliminates ground loop interference in LED string current measurement.
As the -1 variant, it features dedicated SYNC pin (replacing OPENLED) for external oscillator synchronization - requiring internal frequency programming 20% slower than sync signal - and retains all core protections: open LED detection (via FB pin), overvoltage shutdown (FB > VFB + 60mV), short-circuit detection (ISP–ISN > 150mV at low common-mode), and thermal fault latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range automotive battery systems including cold-crank and load-dump transients. |
| Output Voltage Capability | Up to 100V - enables driving long series strings of high-brightness LEDs without cascading stages. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT resistor; higher frequencies reduce magnetic size but increase switching losses. |
| Current Sense Threshold | 100mV nominal - high-side sensing with 98–103mV tolerance over temperature ensures accurate LED current regulation. |
| Operating Temperature Range | –40°C to 125°C - industrial-grade junction rating suitable for under-hood automotive environments. |
| Package | 16-Lead MSOP - thermally enhanced plastic package with exposed pad soldered to PCB ground for improved heat dissipation. |
| SYNC Function | Yes (LT3756-1 variant) - allows precise timing alignment with system clocks or other converters to minimize EMI peaks. |
Pinout & Package
LT3756IMSE-1#TRPBF uses a 16-lead MSOP package (3mm × 4.9mm) with exposed thermal pad (Pin 17 = GND). The package is RoHS-compliant, lead-free, and qualified per AEC-Q100 Grade I.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output | Drives external NMOS disconnect switch; toggles low during FB overvoltage (> VFB + 60mV) to isolate LED load. |
| FB (Pin 2) | Voltage feedback input | Ground-referenced node for CV regulation or open-LED detection; regulates to 1.25V nominal; asserts OPENLED when FB < VFB – 50mV (not available on -1). |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current ≤25µA; enables short-circuit detection when ISN < 3V. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; common-mode range up to 100V; bias current varies with CTRL voltage. |
| VC (Pin 5) | Error amplifier output | Transconductance amplifier output; high-impedance during PWM low; used with RC network for loop compensation. |
| CTRL (Pin 6) | Current threshold adjust | Sets ISP–ISN threshold from 0–100mV linearly (0–1V) or fixed full-scale (≥1.2V); enables analog dimming and thermal compensation. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V ±1.75% reference; supplies ≤100µA; used to bias CTRL or external temperature-sensing networks. |
| PWM (Pin 8) | Digital dimming input | Active-high enable; internal pull-down; controls switching, oscillator, and VC clamping; supports 3000:1 true-color PWM dimming. |
| SS (Pin 10) | Soft-start control | 10µA pull-up to 2.5V rail; external capacitor sets soft-start time; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming | Resistor-to-GND sets switching frequency; 100kΩ → ~100kHz, 10kΩ → ~1MHz; no internal pull-up/down. |
| SHDN/UVLO (Pin 12) | Enable & undervoltage detect | 1.22V falling threshold with programmable hysteresis; sub-µA bias above threshold; pulls down 2.1µA below threshold. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V ±3% regulated supply for gate driver and logic; requires 4.7µF local ceramic bypass; current-limited to 17mA typical. |
| VIN (Pin 14) | Main power input | Accepts 6–100V; must be bypassed with ≥0.22µF ceramic capacitor near IC; powers INTVCC LDO. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current; clamp at 108mV prevents overcurrent. |
| GATE (Pin 16) | MOSFET gate driver | Drives external N-channel FET between INTVCC and GND; rise/fall time ≤35ns into 3300pF; disabled during shutdown/fault. |
| GND (Pin 17) | Power & signal ground | Exposes thermal pad; connects to negative terminal of RSENSE; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost/SEPIC/flyback) without compromising LED string ground reference. |
| Frequency synchronization | SYNC pin (replaces OPENLED on LT3756-1) allows deterministic EMI reduction and multi-converter coordination. |
| True-color PWM dimming | 3000:1 dimming ratio achieved without color shift, using clean digital PWM control independent of analog current regulation. |
| Programmable open-LED protection | FB-based detection (VFB – 50mV threshold) signals disconnection before overvoltage damage occurs in CV mode. |
| AEC-Q100 Grade I qualification | Validated for automotive use across –40°C to +125°C junction temperature, supporting headlamp, DRL, and interior lighting applications. |
Applications
| Automotive Headlamp Driver | Industrial High-Bay Lighting |
|---|---|
Use Scenario: 30W white LED headlamp system powered from 8–60V automotive battery with 100V transient tolerance. IC Role / Device Role / Timing Role: Constant-current controller regulating LED string current while synchronizing switching frequency to vehicle clock to suppress conducted EMI. Use Value: Enables AEC-Q100-compliant design with 3000:1 dimming, open-LED fault reporting, and thermal derating via CTRL pin. | Use Scenario: 100W+ high-bay LED fixture operating from 24–48V DC distribution bus in warehouse or factory setting. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver managing variable input due to long cable drops and load transients. Use Value: Delivers stable current regulation across wide VIN range with programmable UVLO hysteresis and robust short-circuit protection. |
| Battery-Powered Emergency Light | UV-C LED Disinfection Module |
Use Scenario: Portable emergency light using Li-ion battery pack (10–26V) driving multiple parallel LED strings. IC Role / Device Role / Timing Role: Dual-loop controller maintaining constant current during battery discharge while enabling analog dimming via CTRL for runtime extension. Use Value: Combines low shutdown current (<1µA), programmable soft-start, and 100mV current sense for precision at low LED currents. | Use Scenario: Pulsed UV-C LED array (275nm) requiring precise current pulses and fast fault response to prevent LED degradation. IC Role / Device Role / Timing Role: Fast-response current controller with <170ns minimum off-time and ISP/ISN short-circuit detection at <3V common-mode. Use Value: Prevents catastrophic failure during UV LED forward-voltage drift by detecting early short conditions before thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#TRPBF | Four-switch buck-boost controller; no integrated high-side current sense amplifier; requires external op-amp for LED current feedback. | Designed for wide-input, wide-output voltage regulation-not optimized for constant-current LED drive; lacks PWM dimming interface. | Select only if topology requires four-switch buck-boost and LED current sensing is implemented externally with precision amplifiers. |
| LM3410XSDX/NOPB | Fixed-frequency 1.6MHz boost controller; single-stage only; max 40V output; no high-side sensing; no SYNC or OPENLED functionality. | Targeted at low-power portable LED lighting (<5W); not AEC-Q100 qualified; limited thermal rating (–40°C to 125°C ambient, not junction). | Choose only for cost-sensitive, low-power consumer lighting where 100V capability and automotive qualification are unnecessary. |
Compared with LTC3789EMSE#TRPBF and LM3410XSDX/NOPB, the LT3756IMSE-1#TRPBF uniquely integrates high-side current sensing, AEC-Q100 qualification, frequency synchronization, and dual-loop (CC/CV) control in a single 16-pin MSOP package - making it the only option for high-reliability, high-power automotive LED drivers requiring precise dimming and fault management.
Availability
LT3756IMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-bay lighting, battery-powered emergency lights, and UV-C disinfection modules requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT3756IMSE-1#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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive safety systems.
The LT3756 product line was engineered specifically for high-reliability, high-power LED lighting applications - delivering robust current-mode control, wide input/output voltage capability, and automotive-grade reliability in compact packages.
FAQ
What is the key functional difference between LT3756IMSE-1#TRPBF and the base LT3756IMSE#TRPBF?
The LT3756IMSE-1#TRPBF replaces the OPENLED status pin with a SYNC input pin, enabling external oscillator synchronization for EMI reduction and multi-converter timing coordination. Unlike the base LT3756IMSE#TRPBF, it does not provide open-LED fault indication via a dedicated pin - that function is instead managed through FB pin monitoring and system-level interpretation. All other electrical specifications, pinout (except Pin 3), and thermal ratings remain identical.
Does LT3756IMSE-1#TRPBF support both constant-current and constant-voltage regulation simultaneously?
Yes, LT3756IMSE-1#TRPBF supports dual-loop regulation: the ISP/ISN inputs regulate LED string current (constant-current mode), while the FB pin regulates output voltage (constant-voltage mode). The controller prioritizes current regulation under normal operation; voltage feedback becomes active only during open-LED or overvoltage conditions. This dual functionality enables safe fallback behavior and protects against LED string failure.
What is the maximum recommended switching frequency for LT3756IMSE-1#TRPBF in a thermally constrained automotive headlamp design?
For automotive headlamp applications with ambient temperatures up to 85°C and PCB copper area limited to 2 oz/in², Analog Devices recommends limiting LT3756IMSE-1#TRPBF switching frequency to ≤500kHz. This balances magnetic size reduction against increased switching losses and INTVCC loading - especially critical given the 17mA INTVCC current limit and 7.15V LDO dropout constraints at high duty cycles.
Can LT3756IMSE-1#TRPBF drive a buck-boost LED topology with input voltage exceeding output voltage?
Yes, LT3756IMSE-1#TRPBF supports true buck-boost operation where VIN > VOUT, VIN < VOUT, or VIN ≈ VOUT - enabled by its high-side current sense architecture and ability to regulate based on ISP–ISN differential voltage regardless of topology. In buck-boost configurations, the external power stage must use a coupled inductor or four-switch implementation; the controller itself imposes no restriction on relative VIN/VOUT magnitude.
How is undervoltage lockout hysteresis programmed on LT3756IMSE-1#TRPBF?
Undervoltage lockout hysteresis on LT3756IMSE-1#TRPBF is programmed using an external resistor divider from VIN to SHDN/UVLO, leveraging the internal 2.1µA pull-down current active below the 1.22V falling threshold. The rising threshold is set by the divider ratio plus hysteresis current × lower resistor value. For example, with R1 = 1MΩ from VIN to SHDN/UVLO and R2 = 100kΩ from SHDN/UVLO to GND, hysteresis ≈ 210mV.
LT3756IMSE-1#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):
- 6V
- Voltage - Supply (Max):
- 100V
- Voltage - Output:
- 100V
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3756IMSE-1#TRPBF FAQ
1.How can I place an order for LT3756IMSE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE-1#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 LT3756IMSE-1#TRPBF reliable?
The price and inventory of LT3756IMSE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756IMSE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE-1#TRPBF?
LT3756IMSE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE-1#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 LT3756IMSE-1#TRPBF?
For technical support, including LT3756IMSE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE-1#TRPBF requirements.
6.How does Aetrix verify that LT3756IMSE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE-1#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 LT3756IMSE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE-1#TRPBF?
All LT3756IMSE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE-1#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 LT3756IMSE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3756IMSE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756IMSE-1#TRPBF Tags
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