My Inquiry
My Account
Analog Devices Inc. LT3756EMSE#PBF
- Part No.:
- LT3756EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3756EMSE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:235
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3756EMSE#PBF from Analog Devices is a high-voltage DC/DC LED controller IC designed to drive high-current LEDs in boost, buck, or buck-boost topologies. It features 100V input and output capability, 100 mV high-side current sense threshold, adjustable switching frequency (100 kHz–1 MHz), and integrated 7.15 V gate driver supply. It delivers constant-current regulation for automotive headlamps and industrial lighting systems requiring robust open-LED protection and true-color PWM dimming up to 3000:1.
For engineers reviewing the LT3756EMSE#PBF datasheet, LT3756EMSE#PBF pinout, LT3756EMSE#PBF application, or LT3756EMSE#PBF equivalent, key selection considerations include its 16-lead MSOP package with exposed thermal pad, AEC-Q100 qualification for automotive use, high-side current sensing architecture, and dual-loop (constant-current + constant-voltage) regulation capability.
Technical Context
The LT3756EMSE#PBF implements fixed-frequency current-mode control with internal slope compensation and a transconductance error amplifier (VC pin). Its high-side ISP/ISN current sense inputs enable flexible topology support-boost, buck, buck-boost, SEPIC, or flyback-without requiring ground-referenced sensing.
It integrates an internal 7.15 V LDO for gate driving and logic, programmable UVLO with hysteresis via SHDN/UVLO pin, soft-start via external capacitor on SS pin, and dual-dimming control: digital PWM (3000:1) and analog CTRL-pin adjustment of current threshold from 0 to 100 mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 100 V - supports wide-range industrial and automotive battery inputs including 12 V, 24 V, and 48 V systems with 100 V transient tolerance. |
| Output Voltage Capability | Up to 100 V - enables direct driving of long LED strings without intermediate voltage conversion. |
| Current Sense Threshold | 100 mV (typical) at ISP–ISN - enables precise, low-loss high-side current sensing with minimal power dissipation in sense resistor. |
| Switching Frequency Range | 100 kHz to 1 MHz - allows optimization of magnetic size, efficiency, and EMI performance via RT resistor selection. |
| Dimming Ratio | 3000:1 true-color PWM dimming - preserves LED chromaticity across full brightness range for display and architectural lighting. |
| Package & Thermal Rating | 16-lead MSOP with exposed pad; rated –40°C to +125°C junction - suitable for under-hood automotive and high-temperature industrial environments. |
| Regulated INTVCC | 7.15 V ±150 mV - powers gate driver and internal circuitry independently of VIN, ensuring stable FET enhancement even during input dips. |
Pinout & Package
LT3756EMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3 mm × 4.9 mm) with exposed GND pad (Pin 17) that must be soldered to PCB 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 / FB overvoltage fault signal | Drives external NMOS disconnect switch; pulled low when FB exceeds VFB + 60 mV to protect LEDs from overvoltage events. |
| FB (Pin 2) | Voltage feedback input | Ground-referenced input for constant-voltage regulation or open-LED detection; regulates to 1.25 V nominal; asserts OPENLED when below VFB − 50 mV. |
| ISN (Pin 3) | Negative current sense input | High-side current sense return; bias current <25 µA; enables short-circuit detection when ISN < 3 V and |ISP−ISN| > 150 mV. |
| ISP (Pin 4) | Positive current sense input | High-side current sense input; common-mode range up to 100 V; bias current varies with CTRL voltage (≤0.1 µA at standby). |
| VC (Pin 5) | Error amplifier output | Transconductance amplifier output used for loop compensation; high-impedance during PWM low to retain state; requires RC network to GND. |
| CTRL (Pin 6) | Analog dimming / current threshold control | Adjusts ISP–ISN threshold from 0 to 100 mV linearly (0–1 V) then clamped; enables temperature-compensated LED current programming. |
| VREF (Pin 7) | 2 V reference output | Stable 2.00 V ±35 mV reference; supplies ≤100 µA; used to bias CTRL divider or implement thermal foldback. |
| PWM (Pin 8) | Digital dimming input | Active-high PWM enable; internal pull-down; toggles GATE and PWMOUT; enables 3000:1 dimming with minimal color shift. |
| OPENLED (Pin 9) | Open-LED status indicator | Open-collector output asserted when FB < VFB − 50 mV; requires external pull-up <1 mA; latched during PWM low. |
| SS (Pin 10) | Soft-start timing input | 10 µA internal pull-up to 2.5 V rail; soft-start duration set by external capacitor; reset by UVLO or thermal shutdown. |
| RT (Pin 11) | Frequency programming input | Resistor-to-GND sets oscillator frequency (100 kHz–1 MHz); 100 kΩ yields ~1 MHz, 1 MΩ yields ~100 kHz. |
| SHDN/UVLO (Pin 12) | Shutdown and undervoltage lockout | Falling threshold 1.22 V ±35 mV; rising hysteresis programmable via external divider and 2.1 µA internal pull-down current. |
| INTVCC (Pin 13) | Internal regulated supply | 7.15 V LDO output; requires 4.7 µF ceramic bypass close to pin; shuts down if INTVCC drops below 4.1 V. |
| VIN (Pin 14) | Main input supply | Accepts 6–100 V; must be bypassed with ≥0.22 µF ceramic capacitor near pin; powers INTVCC regulator and internal logic. |
| SENSE (Pin 15) | Low-side switch current sense | Kelvin-connected to source of external N-MOSFET; monitors peak switch current; clamped at 108 mV to prevent overcurrent. |
| GATE (Pin 16) | N-channel MOSFET gate driver | Drives external NFET between INTVCC and GND; rise/fall time <35 ns into 3300 pF; disabled during shutdown/fault. |
| GND (Pin 17) | Power and signal ground / exposed pad | Reference for all analog circuits and current sense; exposed thermal pad must be soldered to PCB ground plane for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Enables topology flexibility (boost/buck/buck-boost/SEPIC/flyback) without compromising ground-referenced load or controller isolation. |
| True-color PWM dimming (3000:1) | Maintains consistent LED chromaticity across full dimming range by preserving constant current per PWM cycle, critical for automotive and display lighting. |
| Dual-loop regulation (CC + CV) | Simultaneously regulates LED string current and output voltage-supports both constant-brightness operation and safe open-circuit protection. |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including headlamps and interior lighting; operates reliably from –40°C to +125°C junction temperature. |
| Programmable open-LED detection | Uses FB pin voltage drop (VFB − 50 mV) to assert OPENLED output, enabling system-level fault reporting without additional sensors. |
| Integrated 7.15 V gate driver supply | Eliminates need for external bias supply; ensures full enhancement of external N-MOSFET across wide VIN range, improving efficiency and reliability. |
Applications
| Automotive LED Headlamps | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 30W white LED arrays in vehicle forward lighting with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Constant-current controller managing boost converter with 100V transient tolerance and synchronized PWM dimming. Use Value: Enables 3000:1 true-color dimming for adaptive driving beams while maintaining AEC-Q100 compliance and open-LED fault signaling. |
Use Scenario: Powering multi-string high-lumen LED fixtures in warehouses and factories using 24–48 V DC distribution. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver supporting variable input and long LED strings up to 100 V. Use Value: Delivers >94% efficiency at 30W with programmable UVLO and thermal foldback, reducing heatsink requirements and system cost. |
| UV-C Disinfection Systems | Stage & Architectural Lighting |
|
Use Scenario: Driving high-voltage UV-C LED arrays (e.g., 365 nm, 275 nm) requiring precise current control and rapid on/off cycling. IC Role / Device Role / Timing Role: Constant-current source with fast PWM response (<200 ns delay) and high-side sensing for isolated LED string operation. Use Value: Ensures accurate dose delivery via stable current regulation and eliminates current drift during thermal transients. |
Use Scenario: RGBW tunable luminaires requiring independent channel dimming and color consistency across brightness levels. IC Role / Device Role / Timing Role: Per-channel LED controller supporting analog (CTRL) and digital (PWM) dimming with matched current accuracy. Use Value: Achieves Δu'v' < 0.003 across 0.1–100% dimming via true-color PWM and tight current matching (±1.5% typical). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3756IMSE#PBF | Same functionality and pinout; rated for –40°C to +125°C (I-grade), identical electrical specs but wider production screening. | No functional difference; selected when extended reliability testing or higher confidence in parametric stability across temperature is required. | Choose LT3756IMSE#PBF for industrial or extended-temperature designs where long-term parameter drift must be minimized. |
| LT3756EMSE-2#PBF | Includes improved OPENLED status pin behavior (re-asserts after overvoltage clears) and same package/temp grade; otherwise identical. | Preferred for new designs requiring enhanced open-LED fault recovery logic without changing layout or BOM footprint. | Use LT3756EMSE-2#PBF when system-level fault handling demands automatic OPENLED re-assertion after transient overvoltage events. |
Compared with LT3756IMSE#PBF, the LT3756EMSE#PBF offers identical performance at lower cost for commercial-temperature applications, while LT3756EMSE-2#PBF adds deterministic fault-state recovery-making it optimal for safety-critical lighting where open-LED reporting integrity is essential.
Availability
LT3756EMSE#PBF is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, and UV-C disinfection systems requiring stable component supply, AEC-Q100 compliance, and high-voltage LED control.
Supply support for LT3756EMSE#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 global leader in high-performance analog, mixed-signal, and digital signal processing technologies) designs precision power management ICs for demanding applications.
The LT3756 product line was developed specifically for high-reliability, high-voltage LED driver applications-including automotive forward lighting and industrial solid-state illumination-where topology flexibility, dimming fidelity, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for the LT3756EMSE#PBF?
The LT3756EMSE#PBF has an absolute maximum input voltage rating of 100 V on the VIN pin, and it is specified to operate continuously from 6 V to 100 V. This makes the LT3756EMSE#PBF suitable for 12 V, 24 V, and 48 V battery systems with transient suppression, including automotive applications with load-dump protection.
Does the LT3756EMSE#PBF support both constant-current and constant-voltage regulation?
Yes, the LT3756EMSE#PBF supports dual-loop regulation: constant-current via ISP/ISN high-side sensing and constant-voltage via the FB pin. When FB is used, the device regulates output voltage to 1.25 V (nominal); when ISP/ISN is active, it regulates LED current. Both loops interact to ensure safe operation during open-LED or overvoltage conditions.
What package type and thermal characteristics does the LT3756EMSE#PBF use?
The LT3756EMSE#PBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 4°C/W. The exposed pad must be soldered to the PCB ground plane to achieve rated performance and meet the –40°C to +125°C operating junction temperature specification.
How does the LT3756EMSE#PBF implement open-LED detection?
The LT3756EMSE#PBF detects open-LED conditions by monitoring the FB pin voltage. When FB falls below VFB − 50 mV (i.e., ~1.20 V), the OPENLED pin is actively pulled low. This signal remains latched during PWM low periods and updates only when PWM goes high again-enabling reliable fault reporting in pulsed dimming applications.
Can the LT3756EMSE#PBF drive a buck-boost LED topology?
Yes, the LT3756EMSE#PBF is explicitly designed to support buck-boost configurations, along with boost, buck, SEPIC, and flyback topologies. Its high-side current sensing architecture (via ISP/ISN) decouples the LED string from ground, allowing flexible placement of the LED load relative to the switching node and input/output rails.
LT3756EMSE#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
LT3756EMSE#PBF FAQ
1.How can I place an order for LT3756EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3756EMSE#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 LT3756EMSE#PBF reliable?
The price and inventory of LT3756EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3756EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3756EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3756EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3756EMSE#PBF?
LT3756EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3756EMSE#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 LT3756EMSE#PBF?
For technical support, including LT3756EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3756EMSE#PBF requirements.
6.How does Aetrix verify that LT3756EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3756EMSE#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 LT3756EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3756EMSE#PBF?
All LT3756EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3756EMSE#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 LT3756EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3756EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3756EMSE#PBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
