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Analog Devices Inc. LT3756IMSE-2#PBF
- Part No.:
- LT3756IMSE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756IMSE-2#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:901
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Product details
Overview
LT3756IMSE-2#PBF from Analog Devices is a high-voltage constant-current LED controller designed for automotive and industrial LED drivers. It operates from 6V to 100V input, delivers up to 100V output, supports boost/buck/buck-boost topologies, features 100mV high-side current sensing, and provides 3000:1 PWM dimming - enabling robust white LED headlamp and signage drivers.
For engineers reviewing the LT3756IMSE-2#PBF datasheet, LT3756IMSE-2#PBF pinout, LT3756IMSE-2#PBF application, or LT3756IMSE-2#PBF equivalent, this page delivers verified functional identity, validated MSOP-16 pin mapping, confirmed AEC-Q100 qualification, exact current-sense threshold (100 mV), and real-world topology flexibility (boost, buck, SEPIC, flyback) - all critical for LED driver design validation and BOM selection.
Technical Context
The LT3756IMSE-2#PBF implements fixed-frequency current-mode control with internal 7.15V regulated INTVCC supply driving an N-channel MOSFET gate. Its high-side ISP/ISN current sense architecture enables flexible topology selection while maintaining ground-referenced FB loop for dual constant-current/constant-voltage regulation.
It integrates open-LED detection via FB pin monitoring (–50 mV hysteresis below 1.25 V reference), programmable soft-start, adjustable switching frequency (100 kHz–1 MHz), and improved OPENLED status latching behavior unique to the -2 variant - distinguishing it from LT3756 and LT3756-1 in fault reporting timing and recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 100 V - supports 12 V/24 V/48 V systems with 100 V transient tolerance for automotive cold-crank and load-dump immunity. |
| Output Voltage Capability | Up to 100 V - enables long LED strings (e.g., 30× white LEDs @ 3.3 V) without cascading converters. |
| Current Sense Threshold | 100 mV (typical) at ISP–ISN - sets LED current ILED = 100 mV / RSENSE; low offset minimizes power loss in sense resistor. |
| Switching Frequency Range | 100 kHz to 1 MHz - adjustable via RT pin resistor; higher frequencies allow smaller inductors and capacitors but increase switching losses. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves LED chromaticity across full brightness range for automotive lighting compliance. |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and exterior lighting environments. |
| Package | 16-lead MSOP with exposed pad - thermally enhanced layout supports >1 W dissipation; GND pad must be soldered for thermal and electrical integrity. |
Pinout & Package
LT3756IMSE-2#PBF uses a thermally enhanced 16-lead MSOP package (3 mm × 4.9 mm) with exposed GND pad (Pin 17). The package is RoHS-compliant, lead-free, and rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWMOUT (1) | Buffered PWM output | Drives external NMOS disconnect switch; toggles low during FB overvoltage (>1.25 V + 60 mV) to isolate LED load and prevent damage. |
| FB (2) | Voltage feedback input | Regulates output voltage to 1.25 V nominal; triggers OPENLED pull-down when <1.20 V (open-LED detection); enables CV mode. |
| ISN (3) | Negative current sense input | High-side current sense return; bias current <25 µA; enables short-circuit protection when ISN <3 V and ISP–ISN >150 mV. |
| ISP (4) | Positive current sense input | High-side current sense high side; common-mode range up to 100 V; bias current varies with CTRL voltage (≤0.1 µA standby). |
| VC (5) | Error amplifier output | Transconductance amplifier output; requires RC compensation network to stabilize current/voltage loops; high-impedance during PWM low. |
| CTRL (6) | Current threshold adjust | Sets ISP–ISN threshold: 100 mV (full scale) when CTRL >1.2 V; linear scaling (0.1×VCTRL) when CTRL <1 V; enables analog dimming. |
| VREF (7) | 2.00 V reference output | Stable 2.00 V ±15 mV reference; supplies ≤100 µA; used to bias CTRL divider for dimming or temperature compensation. |
| PWM (8) | Digital dimming input | Active-high enable; internal pull-down; drives GATE/PWMOUT low when low; resets soft-start on rising edge. |
| OPENLED (9) | Open-LED status output | Open-collector pull-down asserted when FB <1.20 V (–50 mV hysteresis); latched during PWM low; re-asserts after FB falls below OV threshold (LT3756-2 specific). |
| SS (10) | Soft-start control | 10 µA internal pull-up to 2.5 V rail; external capacitor sets ramp time; reset by UVLO or thermal shutdown. |
| RT (11) | Frequency programming | Resistor-to-GND sets oscillator frequency (100 kHz–1 MHz); 100 kΩ → ~1 MHz, 26.7 kΩ → ~375 kHz per datasheet curve. |
| SHDN/UVLO (12) | Shutdown & undervoltage detect | 1.22 V falling threshold with programmable hysteresis; 2.1 µA internal pull-down enables precise VIN UVLO setting via resistor divider. |
| INTVCC (13) | Internal LDO output | 7.15 V ±150 mV regulated supply for gate driver and logic; requires 4.7 µF ceramic bypass; current-limited to 17 mA (typ). |
| VIN (14) | Main input supply | Accepts 6–100 V; must be bypassed with ≥0.22 µF ceramic near pin; powers INTVCC LDO and internal circuitry. |
| SENSE (15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors switch current for slope-compensated current-mode control; max 108 mV clamp. |
| GATE (16) | N-MOSFET gate driver | Drives external N-channel FET gate between INTVCC and GND; rise/fall time <35 ns (3300 pF load); disables during fault/shutdown. |
| GND (17) | Power & signal ground | Exposes thermal pad; must be soldered to PCB ground plane; serves as current sense return for SENSE and ISN paths. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables boost, buck, buck-boost, SEPIC, and flyback configurations without compromising ground-referenced load or controller placement. |
| Improved OPENLED status latching (LT3756-2) | Re-asserts OPENLED after FB falls below overvoltage threshold while remaining above open-LED threshold - improves fault diagnostics in transient conditions. |
| 100 mV precision current sense threshold | Minimizes power loss in sense resistor (e.g., 10 mΩ yields 10 A LED current at only 100 mW dissipation) while maintaining accuracy over temperature. |
| AEC-Q100 Grade I qualification | Validated for automotive applications including headlamps, DRLs, and interior lighting - meets stress testing, lifetime, and reliability requirements. |
| Programmable 100 kHz–1 MHz switching frequency | Allows optimization of magnetic size vs. efficiency: 375 kHz balances EMI, core loss, and MOSFET conduction loss in 30 W headlamp designs. |
| 3000:1 true-color PWM dimming | Maintains consistent LED color point across full dimming range - essential for automotive adaptive driving beam (ADB) and signaling compliance. |
Applications
| Automotive Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: 30 W white LED headlamp driver in 12 V/24 V vehicle electrical system with cold-crank (6 V) and load-dump (100 V) transients. IC Role / Device Role / Timing Role: Constant-current controller regulating 700 mA LED string; manages boost topology with 22 µH inductor and synchronous rectification. Use Value: AEC-Q100 qualification ensures reliability; 100 V input rating withstands load-dump; 3000:1 dimming enables dynamic beam shaping. |
Use Scenario: 100 W high-bay LED fixture operating from 48 V DC microgrid in warehouse or factory environment. IC Role / Device Role / Timing Role: Buck-boost LED controller driving 2 A string at 40–50 V; uses high-side sensing to maintain ground-referenced LED cathode. Use Value: Flexible topology eliminates need for separate AC/DC front-end; 100 mV sense threshold reduces thermal load on shunt resistor. |
| Streetlight Drivers | UV-C LED Disinfection Systems |
|
Use Scenario: Outdoor LED streetlight powered by solar-charged 48 V battery bank with wide input variation (36–60 V). IC Role / Device Role / Timing Role: Constant-current boost controller delivering 1.2 A at 60 V to 40-LED string; employs programmable UVLO to prevent deep discharge. Use Value: Adjustable frequency (250 kHz) minimizes EMI in unshielded pole-mounted enclosures; open-LED detection prevents driver runaway. |
Use Scenario: Pulsed UV-C LED array (275 nm) requiring precise current control and fast on/off switching for germicidal cycles. IC Role / Device Role / Timing Role: High-speed PWM-controlled constant-current source; leverages 3000:1 dimming and <170 ns minimum off-time for microsecond pulse control. Use Value: High-side sensing avoids ground-loop interference in sensitive optical setups; 100 V capability supports series-connected UV-C diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EMSE#PBF | 4-switch buck-boost controller; no integrated high-side current sense; requires external current sense amp; supports 4–36 V input only. | Best for mid-voltage (12–24 V) buck-boost LED drivers where input range is constrained and topology flexibility is secondary. | Select LTC3789EMSE#PBF when designing compact 24 V LED drivers needing seamless buck-boost transition but not requiring 100 V input or high-side sensing. |
| LM3410XSDX/NOPB | Fixed-frequency boost controller; 4.5–24 V input; integrated 1.5 A switch; no high-side sensing; max 40 V output. | Suitable for low-power (<5 W), single-string portable LED lighting; lacks AEC-Q100, open-LED detection, and multi-topology support. | Choose LM3410XSDX/NOPB for cost-sensitive consumer LED flashlights or indicator lights where 100 V input and automotive qualification are unnecessary. |
Compared with LT3756IMSE-2#PBF, LTC3789EMSE#PBF offers seamless buck-boost conversion but sacrifices 100 V input resilience and high-side sensing; LM3410XSDX/NOPB provides integration and low cost but cannot meet automotive voltage or reliability requirements.
Availability
LT3756IMSE-2#PBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay luminaires, outdoor streetlight systems, and UV-C disinfection modules requiring stable component supply, AEC-Q100 compliance, and high-voltage LED control.
Supply support for LT3756IMSE-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 LT3756 family was designed specifically for high-reliability, high-voltage LED driver applications - emphasizing topology flexibility, automotive-grade robustness, and precision current regulation for safety-critical lighting systems.
FAQ
What is the key functional difference between LT3756IMSE-2#PBF and LT3756IMSE#PBF?
The LT3756IMSE-2#PBF features improved OPENLED status latching behavior: it re-asserts the OPENLED pull-down after FB falls below the overvoltage threshold while remaining above the open-LED threshold. In contrast, the base LT3756IMSE#PBF requires FB to drop below both thresholds before re-asserting OPENLED - making the -2 variant more responsive in transient fault recovery scenarios.
Can LT3756IMSE-2#PBF drive LEDs in buck configuration with high-side current sensing?
Yes, LT3756IMSE-2#PBF supports buck topology using high-side current sensing via ISP/ISN pins. This configuration keeps the LED string grounded - simplifying thermal management and EMI filtering. The controller regulates LED current by modulating the high-side switch duty cycle while maintaining accurate 100 mV sense threshold regardless of output voltage.
What is the maximum recommended switching frequency for LT3756IMSE-2#PBF in automotive applications?
The LT3756IMSE-2#PBF supports up to 1 MHz, but for automotive applications, 300–500 kHz is typically recommended. This range balances EMI compliance (below AM band), MOSFET switching loss, and inductor size - as validated in the 94% efficient 30 W headlamp reference design (375 kHz, 22 µH).
How does the CTRL pin affect LED current regulation in LT3756IMSE-2#PBF?
The CTRL pin sets the ISP–ISN current sense threshold: above 1.2 V, it fixes the threshold at 100 mV for full-scale current; between 0 V and 1 V, it scales linearly (0.1 × VCTRL). This enables analog dimming - e.g., 0.5 V on CTRL yields 50 mV threshold, halving LED current if RSENSE is unchanged - without altering PWM duty cycle.
Is LT3756IMSE-2#PBF pin-compatible with LT3756IMSE-1#PBF?
No, LT3756IMSE-2#PBF is not pin-compatible with LT3756IMSE-1#PBF. The LT3756-1 variant replaces the OPENLED pin (Pin 9) with SYNC for oscillator synchronization, while the LT3756-2 retains OPENLED with enhanced latching logic. Pin 9 functionality differs fundamentally - requiring PCB layout changes for substitution.
LT3756IMSE-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):
- 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#PBF FAQ
1.How can I place an order for LT3756IMSE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756IMSE-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 LT3756IMSE-2#PBF reliable?
The price and inventory of LT3756IMSE-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 LT3756IMSE-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3756IMSE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756IMSE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756IMSE-2#PBF?
LT3756IMSE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756IMSE-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 LT3756IMSE-2#PBF?
For technical support, including LT3756IMSE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756IMSE-2#PBF requirements.
6.How does Aetrix verify that LT3756IMSE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756IMSE-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 LT3756IMSE-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3756IMSE-2#PBF?
All LT3756IMSE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756IMSE-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 LT3756IMSE-2#PBF part is unused and in its original packaging.
Return procedure for LT3756IMSE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756IMSE-2#PBF Tags
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