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Analog Devices Inc. LT3756IMSE-2#TRPBF
- Part No.:
- LT3756IMSE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE-2#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
LT3756IMSE-2#TRPBF from Analog Devices is a constant-current, constant-voltage LED controller IC designed for high-power LED drivers in automotive and industrial lighting. It supports 6V–100V input, delivers up to 100V output, senses current on the high side (100mV threshold), operates at 100kHz–1MHz adjustable frequency, and drives external N-channel MOSFETs via a 7.15V regulated gate driver. It enables true-color PWM dimming up to 3000:1 in boost, buck, or buck-boost topologies.
For engineers reviewing the LT3756IMSE-2#TRPBF datasheet, LT3756IMSE-2#TRPBF pinout, LT3756IMSE-2#TRPBF application, or LT3756IMSE-2#TRPBF equivalent, key selection considerations include high-side current sensing architecture, AEC-Q100 qualification, open-LED fault reporting via OPENLED pin, programmable undervoltage lockout with hysteresis, and thermal shutdown protection at 165°C.
Technical Context
The LT3756IMSE-2#TRPBF implements fixed-frequency current-mode control with internal slope compensation, enabling stable regulation across wide VIN (6V–100V) and VOUT (up to 100V) ranges. Its dual-loop architecture simultaneously manages LED current via ISP/ISN differential sensing and voltage regulation via FB, with automatic loop dominance arbitration.
It features an improved OPENLED status pin (vs. LT3756/LT3756-1), asserting a pull-down when FB falls 50mV below 1.25V reference-indicating open-circuit LED conditions-while de-asserting during overvoltage events (>1.31V). The CTRL pin linearly adjusts current-sense threshold from 0V to 1V (10× scaling), then holds at 100mV above 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports 12V/24V/48V systems and handles 100V transients common in automotive load-dump scenarios. |
| Output Voltage Capability | Up to 100V - enables driving long LED strings (e.g., 30+ white LEDs) without cascading converters. |
| Current Sense Threshold | 100mV (typical) at ISP–ISN - enables precise, low-loss high-side sensing with minimal resistor power dissipation. |
| Switching Frequency Range | 100kHz to 1MHz - adjustable via RT pin resistor; higher frequencies reduce inductor size but increase switching losses. |
| FB Regulation Voltage | 1.25V (nominal) - ground-referenced feedback node enabling constant-voltage operation and open-LED detection. |
| INTVCC Regulator | 7.15V (typical), 17mA current limit - powers gate driver and internal logic; dropout <1V ensures robustness down to ~7V VIN. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| Shutdown Current | <1µA - achieved by pulling SHDN/UVLO ≤ 0.4V; critical for battery-powered or always-on lighting systems. |
Pinout & Package
LT3756IMSE-2#TRPBF is housed in a thermally enhanced 16-lead MSOP package (3mm × 4.9mm) with exposed pad (Pin 17) soldered to PCB ground for thermal and electrical integrity. θJA = 43°C/W, θJC = 4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (Pin 1) | Buffered PWM output / Overvoltage protection signal | Drives NMOS disconnect switch; pulled low if FB > 1.31V to isolate LED load during overvoltage faults. |
| FB (Pin 2) | Voltage feedback / Open-LED detection input | Regulated to 1.25V; OPENLED asserts when FB drops to 1.20V (–4%), signaling open-circuit condition. |
| 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 high terminal; combined ISP/ISN bias <0.1µA in standby; supports 2.9V–100V common-mode range. |
| VC (Pin 5) | Error amplifier output | Integrates difference between ISP–ISN and CTRL-set threshold; high-impedance during PWM low for state retention. |
| CTRL (Pin 6) | Current threshold programming input | Linearly scales ISP–ISN threshold from 0V to 1V (10×), then clamps at 100mV; max 1.1V input for full-scale operation. |
| VREF (Pin 7) | 2.0V reference output | Stable 2.0V source (±20mV) for CTRL divider or temperature compensation networks; supplies ≤100µA. |
| PWM (Pin 8) | Digital dimming enable input | Active-high; internal pull-down; disables switching and idles oscillator when low; PWMOUT follows synchronously. |
| OPENLED (Pin 9) | Open-LED fault indicator | Open-collector output; pulls down when FB < 1.20V (LT3756-2 only); requires external pull-up <1mA. |
| SS (Pin 10) | Soft-start timing input | 10µA internal pull-up to 2.5V rail; soft-start time set by external capacitor; reset by UVLO or thermal fault. |
| RT (Pin 11) | Frequency programming input | Resistor-to-GND sets oscillator frequency; 100kΩ → ~100kHz, 10kΩ → ~1MHz per datasheet curve. |
| SHDN/UVLO (Pin 12) | Enable / Undervoltage lockout input | Falling threshold 1.22V ±15mV; 2.1µA internal pull-down enables hysteresis programming with external resistors. |
| INTVCC (Pin 13) | Internal LDO output | 7.15V regulated supply for gate driver and logic; bypass with ≥4.7µF ceramic capacitor near pin. |
| VIN (Pin 14) | Main power input | Accepts 6V–100V; must be bypassed with ≥0.22µF ceramic capacitor close to pin; powers INTVCC LDO. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current for cycle-by-cycle limiting (108mV threshold). |
| GATE (Pin 16) | N-MOSFET gate driver output | Swings between GND and INTVCC (7.15V); drives external FET gate; forced low during shutdown/fault/idle. |
| GND (Pin 17) | Power and signal ground / Exposed pad | Reference for SENSE, ISN, and all analog circuitry; exposed pad must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables flexible topology selection (boost/buck/buck-boost/SEPIC/flyback) without compromising ground-referenced LED cathode/anode configuration. |
| True Color PWM™ dimming | 3000:1 dimming ratio achieved without color shift, enabled by precise timing control and fast gate drive (<35ns rise/fall). |
| Integrated open-LED detection | Uses FB pin voltage deviation (−50mV from 1.25V) to assert OPENLED pin-no external comparator or circuitry required. |
| Programmable undervoltage lockout | Accurate 1.22V falling threshold with user-defined hysteresis via external resistor divider, ensuring reliable startup under varying battery conditions. |
| AEC-Q100 Grade I qualification | Validated for automotive applications across −40°C to +125°C junction temperature, including HTOL, TC, and ESD testing per AEC standard. |
| Thermal shutdown protection | 165°C junction limit with automatic recovery; prevents permanent damage during overload or poor heatsinking conditions. |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Driving 30W+ white LED arrays in vehicle forward lighting with dynamic dimming and fault monitoring. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter topology; regulates LED current while detecting open-circuit faults via OPENLED pin. Use Value: Enables AEC-Q100-compliant, 94% efficient headlamp designs with 3000:1 PWM dimming and load-disconnect safety during overvoltage events. | Use Scenario: Powering multi-string 100W+ LED fixtures in warehouses and factories requiring long service life and thermal resilience. IC Role / Device Role / Timing Role: High-voltage constant-current source operating in buck-boost mode to maintain regulation across wide input (24V–72V DC) and LED string voltage variations. Use Value: Delivers stable current despite line fluctuations and ambient temperature swings (−40°C to +125°C), reducing field failure rates in unconditioned environments. |
| UV-C Disinfection Systems | Battery-Powered Emergency Lighting |
Use Scenario: Driving high-voltage UV-C LED strings (365nm, 40V+ forward) used in medical sterilization equipment. IC Role / Device Role / Timing Role: High-side current controller supporting up to 100V output in boost configuration; provides precise current regulation critical for germicidal efficacy. Use Value: Ensures consistent optical output over lifetime by maintaining ±1% current accuracy and rejecting input ripple through current-mode control. | Use Scenario: LED lighting for emergency exit signs powered by sealed lead-acid or LiFePO₄ batteries with wide discharge range (10V–14V). IC Role / Device Role / Timing Role: Wide-input (6V–100V) constant-current controller with <1µA shutdown current, enabling multi-year standby life on backup power. Use Value: Extends battery runtime by minimizing quiescent loss and enabling deep sleep modes without sacrificing fast wake-up response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Fixed 200kHz frequency; no adjustable RT; lacks OPENLED pin; uses external VREF for current sense. | Targeted at lower-cost, fixed-frequency LED drivers where programmability and fault reporting are secondary. | Select when system-level fault signaling is not required and board space allows larger passive components due to fixed lower frequency. |
| MAX16834ATI+T | Supports only boost topology; 4.5V–65V input; no high-side current sensing; integrated gate driver rated for 1.5A peak. | Optimized for cost-sensitive AC/DC offline LED drivers with limited input range and single-topology constraint. | Choose for simpler boost-only designs with lower input voltage ceilings and no need for buck/buck-boost flexibility or AEC-Q100 compliance. |
Compared with LTC3783EFE#TRPBF and MAX16834ATI+T, the LT3756IMSE-2#TRPBF offers superior topology flexibility (boost/buck/buck-boost/SEPIC/flyback), AEC-Q100 qualification, programmable frequency, and dedicated OPENLED fault reporting-making it optimal for mission-critical, high-reliability LED systems demanding design adaptability and diagnostics.
Availability
LT3756IMSE-2#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, UV-C disinfection systems, and battery-powered emergency lighting requiring stable component supply, extended temperature operation, and AEC-Q100 reliability.
Supply support for LT3756IMSE-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT3756 family is part of Analog Devices' Power by Linear portfolio, engineered specifically for high-efficiency, high-reliability LED driver applications requiring wide input/output voltage capability, flexible topology support, and robust fault protection in automotive and industrial environments.
FAQ
What is the key functional difference between LT3756IMSE-2#TRPBF and the base LT3756IMSE#TRPBF?
The LT3756IMSE-2#TRPBF includes an improved OPENLED status pin that re-asserts after an overvoltage event subsides, whereas the base LT3756IMSE#TRPBF does not re-assert OPENLED until FB drops below both the open-LED and overvoltage thresholds. This makes LT3756IMSE-2#TRPBF more responsive to transient fault recovery in safety-critical LED systems like automotive lighting.
Can LT3756IMSE-2#TRPBF operate in buck mode with input voltage lower than output voltage?
No - buck mode requires VIN > VOUT. The LT3756IMSE-2#TRPBF supports buck mode only when input exceeds output voltage. For VIN < VOUT, it must be configured in boost mode. Its ability to operate in buck, boost, buck-boost, SEPIC, or flyback topologies depends entirely on external component selection and layout-not internal architecture limitations.
What is the maximum recommended switching frequency for LT3756IMSE-2#TRPBF in a 125°C ambient environment?
At 125°C junction temperature, the maximum recommended switching frequency is 800kHz. While the datasheet specifies up to 1MHz at 25°C, thermal derating reduces practical upper limit due to increased INTVCC power dissipation and gate driver self-heating. Use RT = 12.4kΩ for ~800kHz to ensure margin under worst-case thermal conditions.
How does the CTRL pin affect LED current regulation in LT3756IMSE-2#TRPBF?
The CTRL pin sets the ISP–ISN current-sense threshold: for 0V < VCTRL < 1V, threshold = 10 × VCTRL; above 1.2V, threshold is fixed at 100mV. At VCTRL = 0.5V, for example, the controller regulates LED current to produce 50mV across the sense resistor - enabling precise analog dimming or temperature-compensated current limiting without modifying hardware.
Is LT3756IMSE-2#TRPBF pin-compatible with LT3756IMSE-1#TRPBF?
No - LT3756IMSE-2#TRPBF and LT3756IMSE-1#TRPBF are not pin-compatible. The LT3756IMSE-1#TRPBF substitutes SYNC for OPENLED on Pin 9, while LT3756IMSE-2#TRPBF retains OPENLED on Pin 9. Swapping them requires PCB redesign to route SYNC functionality or repurpose the OPENLED signal externally.
LT3756IMSE-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):
- 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-2#TRPBF FAQ
1.How can I place an order for LT3756IMSE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE-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 LT3756IMSE-2#TRPBF reliable?
The price and inventory of LT3756IMSE-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 LT3756IMSE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE-2#TRPBF?
LT3756IMSE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE-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 LT3756IMSE-2#TRPBF?
For technical support, including LT3756IMSE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE-2#TRPBF requirements.
6.How does Aetrix verify that LT3756IMSE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE-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 LT3756IMSE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE-2#TRPBF?
All LT3756IMSE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE-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 LT3756IMSE-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3756IMSE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756IMSE-2#TRPBF Tags
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