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Analog Devices Inc. LT3754EUH#TRPBF
- Part No.:
- LT3754EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3754EUH#TRPBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 50MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
LT3754EUH#TRPBF from Analog Devices (formerly Linear Technology) is a 16-channel, ±2.8% current-matched LED driver IC with integrated step-up DC/DC controller, capable of driving up to 45V LED strings at 10mA–50mA per channel. It features true-color PWM dimming up to 3000:1, programmable switching frequency (100kHz–1MHz), and adaptive VOUT regulation for optimal efficiency in automotive backlighting systems.
For engineers reviewing the LT3754EUH#TRPBF datasheet, LT3754EUH#TRPBF pinout, LT3754EUH#TRPBF application, or LT3754EUH#TRPBF equivalent, key selection criteria include LED current matching accuracy, open-LED fault tolerance, thermal derating capability via TSET/CTRL pins, and compatibility with external N-channel MOSFETs for high-efficiency boost conversion.
Technical Context
The LT3754EUH#TRPBF implements a current-mode boost topology with dual transconductance error amplifiers-one regulating LED string voltage (to maintain ≥1.1V at each LEDx pin), the other enforcing programmable overvoltage protection (OVP) when all strings open. Its VC pin controls peak inductor current and duty cycle, while SENSE monitors MOSFET source current for cycle-by-cycle limiting.
It integrates a 7V INTVCC LDO for gate drive, a precision 1.485V VREF for programming CTRL/OVPSET/TSET, and a 1.476V SHDN/UVLO threshold with 2.4µA hysteresis current for programmable input undervoltage lockout. Fault detection is latched during PWM low time and reported on the active-low FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 independent current sinks, each programmable 10–50mA via single ISET resistor |
| Current Matching | ±2.8% max deviation across channels at 20mA; enables uniform brightness in multi-string displays |
| PWM Dimming Range | 3000:1 true-color ratio; preserves color fidelity without current-stepping artifacts |
| Switching Frequency | Programmable 100kHz–1MHz via RT resistor or external SYNC clock; supports EMI optimization |
| VOUT Capability | Up to 60V absolute max; regulates adaptively to lowest LEDx pin voltage (≥1.1V) for efficiency |
| Operating Temp | –40°C to +125°C junction; validated for automotive cabin and display module environments |
| OVP Protection | User-programmable via OVPSET pin (0.22V–1V → 12.5V–57V); prevents damage during LED reconnection |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad; θJC = 3°C/W for high-power thermal management |
Pinout & Package
LT3754EUH#TRPBF is housed in a thermally enhanced 32-pin plastic QFN (UH package), 5mm × 5mm body with exposed GND pad (Pin 33) requiring PCB soldering for thermal and electrical integrity. The package supports high-current LED driving with low thermal resistance (θJC = 3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED8, LED17–LED24 (Pins 1–8, 17–24) | 16 LED current sink outputs | Open-collector constant-current sinks; cathodes connect here, anodes to VOUT; paralleling allowed for >50mA/channel |
| SENSE (Pin 9) | Inductor current sense input | Connects to source resistor of external N-MOSFET; sets peak current limit and enables cycle-by-cycle protection |
| GATE (Pin 10) | N-MOSFET gate driver output | ±0.8A peak drive into 3300pF load; 30ns rise/fall times; rail-to-rail swing (0V to INTVCC) |
| INTVCC (Pin 11) | Internal 7V LDO output | Supplies GATE driver and internal circuitry; requires 4.7µF ceramic bypass; UVLO+ = 3.8V, UVLO− = 3.4V |
| SHDN/UVLO (Pin 13) | Shutdown and input UVLO control | 1.476V threshold with 2.4µA hysteresis; enables programmable VIN turn-on/off using resistor divider |
| FAULT (Pin 14) | Open-LED fault indicator | Active-low open-drain flag; asserted only during PWM high time; latched until next PWM high |
| SYNC (Pin 15) | External clock synchronization input | Accepts 0.12–1.5MHz clock; RT must be set for fOSC 20% below SYNC frequency |
| VOUT (Pin 16) | Boost converter output node | Connects to LED string anodes and output capacitor; maximum regulated voltage set by OVPSET |
| RT (Pin 25) | Oscillator frequency programming | Resistor to GND sets fOSC from 100kHz (523kΩ) to 1MHz (39.2kΩ); line regulation <0.2%/V |
| VC (Pin 26) | Error amplifier output | Drives external RC compensation network; controls peak inductor current and loop stability |
| PWM (Pin 27) | PWM dimming control input | Logic-level interface (0.7V low / 1.4V high); disables switching when <0.7V; leakage <24µA at 6V |
| OVPSET (Pin 28) | OVP regulation reference | 0.22V–1V input sets VOUT clamp from 12.5V–57V; input current <200nA ensures stable programming |
| CTRL (Pin 29) | Analog dimming and thermal derating control | 0–1V input scales LED current linearly; negative TC resistor dividers enable ambient temperature derating |
| TSET (Pin 30) | Junction temperature derating trigger | 630mV threshold; initiates LED current reduction when die temperature exceeds programmed breakpoint |
| VREF (Pin 31) | 1.485V precision reference | Stable 1.45–1.524V output; supplies ≤150µA; used to bias CTRL/OVPSET/TSET resistor networks |
| ISET (Pin 32) | LED current programming input | Resistor to GND sets master current (14.7kΩ = 20mA, 5.76kΩ = 50mA); 1.00V nominal pin voltage |
| Exposed Pad (Pin 33) | Thermal and power ground | Must be soldered to continuous PCB copper plane; primary heat path; electrically GND |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio with no color shift-achieved via precise current-source modulation rather than duty-cycle-only control |
| Adaptive VOUT regulation | VOUT dynamically tracks the minimum required voltage across active LED strings (≥1.1V at each LEDx), minimizing power loss and heat |
| Open-LED fault resilience | Single or multiple open strings do not disrupt operation of remaining channels; FAULT pin signals failure without system shutdown |
| Programmable thermal derating | Two independent derating paths: ambient (via CTRL) and junction (via TSET), enabling robust LED lifetime management |
| Integrated protection suite | Includes overvoltage (OVP), overcurrent (SENSE), open-LED (FAULT), short-circuit (VOUT–LEDx), and INTVCC UVLO with hiccup-mode recovery |
| Flexible frequency control | Single-resistor programming or external SYNC; supports EMI spread-spectrum design and noise-sensitive applications |
Applications
| Automotive Instrument Cluster Backlighting | Notebook Display Edge-Lighting |
|---|---|
Use Scenario: Driving 16 parallel LED strings behind TFT LCD in vehicle instrument clusters, operating continuously under wide ambient temperature swings (–40°C to +85°C). IC Role / Device Role / Timing Role: Primary LED current controller and boost converter supervisor; regulates per-string current while adapting VOUT to varying LED forward voltage due to temperature drift. Use Value: ±2.8% current matching ensures uniform panel luminance; TSET-triggered derating prevents thermal runaway during prolonged high-brightness operation. | Use Scenario: Powering ultra-thin edge-lit LED arrays in 13–15" notebook displays, where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Single-chip solution integrating boost controller, 16-channel current sinks, and fault diagnostics-replacing discrete drivers and controllers. Use Value: 5mm × 5mm QFN package enables compact layout; 3000:1 PWM dimming meets HDR UI requirements without color distortion. |
| Industrial HMI Panel Lighting | Medical Imaging Display Backlight |
Use Scenario: Illuminating ruggedized human-machine interface panels in factory automation equipment, requiring long-term reliability and EMC compliance. IC Role / Device Role / Timing Role: High-efficiency LED driver with programmable frequency (100kHz–1MHz) to avoid sensitive bands in industrial noise environments. Use Value: SYNC input allows locking to system clock for deterministic EMI; open-LED fault reporting enables predictive maintenance alerts. | Use Scenario: Backlighting diagnostic-grade grayscale medical displays demanding precise luminance stability and zero flicker across clinical viewing angles. IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming (25:1) and PWM dimming (3000:1) for seamless brightness transitions during image review. Use Value: VREF-stabilized CTRL and ISET references ensure <±0.7% typical current matching-critical for DICOM calibration consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3761EUFD#TRPBF | Single-channel, 100V boost LED driver; higher VOUT capability but no multi-string current matching | Suitable for high-voltage single-string applications (e.g., street lighting), not for uniform multi-string backlighting | Select when driving one high-VF string >45V; avoid for 16-channel matched-current needs |
| TPS68402RHBR | 4-channel, 40V LED driver with I²C interface; lacks programmable OVP, thermal derating, and >1000:1 PWM | Targeted at space-constrained consumer displays with digital control; no automotive temp grade or fault flag | Choose for I²C-configurable designs with lower channel count; not drop-in for LT3754EUH#TRPBF's analog control and robustness |
Compared with LT3754EUH#TRPBF, LT3761EUFD#TRPBF offers higher voltage headroom but no multi-channel matching or FAULT signaling, while TPS68402RHBR provides digital configurability at the cost of reduced dimming range, thermal management, and automotive qualification.
Availability
LT3754EUH#TRPBF is available at Aetrix Electronics and suitable for automotive instrument clusters, notebook display backlighting, industrial HMI panels, and medical imaging displays requiring stable component supply, extended temperature operation, and high-reliability LED current regulation.
Supply support for LT3754EUH#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management product lines with rigorous automotive and industrial qualification standards.
The LT3754EUH#TRPBF belongs to Linear's high-efficiency LED driver family, designed specifically for multi-string backlighting in safety-critical and visually demanding applications where current matching, thermal resilience, and fault transparency are essential.
FAQ
What is the maximum LED string voltage supported by the LT3754EUH#TRPBF?
The LT3754EUH#TRPBF supports up to 45V of LEDs per string, with an absolute maximum VOUT rating of 60V. Its adaptive regulation ensures VOUT remains just above the minimum required to maintain 1.1V at the lowest LEDx pin, optimizing efficiency across varying LED forward voltages and temperatures. This makes LT3754EUH#TRPBF ideal for multi-LED automotive and display applications where VF drift must be accommodated without overvoltage stress.
How does the LT3754EUH#TRPBF handle open-LED faults without disrupting other channels?
The LT3754EUH#TRPBF monitors each LEDx pin voltage independently; if any string opens (VLEDx < 0.5V), the FAULT pin asserts low but the remaining channels continue regulated operation. The control loop ignores open pins and regulates VOUT based only on active strings. When all strings open, VOUT rises until limited by the OVPSET-programmed ceiling. This behavior ensures LT3754EUH#TRPBF delivers fail-operational reliability critical in automotive and medical displays.
Can the LT3754EUH#TRPBF achieve both analog and PWM dimming simultaneously?
No-the LT3754EUH#TRPBF uses separate control paths: analog dimming via the CTRL pin (0–1V, 25:1 range) and PWM dimming via the PWM pin (0.7V/1.4V logic thresholds, 3000:1 range). Simultaneous use is not supported; applying analog dimming while PWM is active results in undefined behavior. For hybrid dimming schemes, LT3754EUH#TRPBF requires external sequencing-e.g., setting CTRL for coarse level and PWM for fine adjustment in non-overlapping phases.
What thermal management requirements apply to the LT3754EUH#TRPBF's exposed pad?
The LT3754EUH#TRPBF's exposed pad (Pin 33) must be soldered to a continuous, low-impedance PCB copper ground plane to achieve its specified θJC = 3°C/W. Insufficient thermal vias or isolated pad connection causes junction temperature rise, triggering TSET-based current derating or thermal shutdown. A minimum of 9 thermal vias (0.3mm diameter, spaced ≤1mm apart) under the pad is recommended for sustained 50mA/channel operation. This ensures LT3754EUH#TRPBF maintains performance across its full –40°C to +125°C junction range.
Is the LT3754EUH#TRPBF pin-compatible with other variants like LT3754IUH#TRPBF?
Yes-LT3754EUH#TRPBF and LT3754IUH#TRPBF share identical pinout, package (32-pin 5mm × 5mm QFN), and electrical interface. The 'E' grade is specified for –40°C to +125°C operation and is fully compatible with 'I' grade designs, though the 'I' grade undergoes additional characterization across the full range. No PCB changes are needed when substituting LT3754EUH#TRPBF into an LT3754IUH#TRPBF layout, making LT3754EUH#TRPBF suitable for automotive and industrial upgrades requiring guaranteed extended-temperature validation.
LT3754EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LT3754EUH#TRPBF FAQ
1.How can I place an order for LT3754EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3754EUH#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 LT3754EUH#TRPBF reliable?
The price and inventory of LT3754EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3754EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3754EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3754EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3754EUH#TRPBF?
LT3754EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3754EUH#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 LT3754EUH#TRPBF?
For technical support, including LT3754EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3754EUH#TRPBF requirements.
6.How does Aetrix verify that LT3754EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3754EUH#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 LT3754EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3754EUH#TRPBF?
All LT3754EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3754EUH#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 LT3754EUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3754EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3754EUH#TRPBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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