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Analog Devices Inc. LT3754IUH#TRPBF
- Part No.:
- LT3754IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LT3754IUH#TRPBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 50MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,242
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Product details
Overview
LT3754IUH#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, programmable 10mA–50mA per channel, 45V output capability, and True Color PWM dimming up to 3000:1. It operates from 6V–40V input and regulates VOUT adaptively to LED forward voltage for optimal efficiency in automotive backlighting systems.
For engineers reviewing the LT3754IUH#TRPBF datasheet, LT3754IUH#TRPBF pinout, LT3754IUH#TRPBF application, or LT3754IUH#TRPBF equivalent, key selection criteria include channel current matching tolerance, open-LED fault resilience, programmable thermal derating via TSET, OVPSET-configurable overvoltage protection, and synchronization capability with external clock sources.
Technical Context
The LT3754IUH#TRPBF implements a current-mode boost controller with dual transconductance error amplifiers-one regulating LED string compliance (ensuring ≥1.1V at each LED pin), the other activating only during all-string open faults to clamp VOUT at a user-defined level via OVPSET. Its VC pin directly controls peak inductor current and duty cycle.
Each of the 16 LEDx pins functions as an accurate, externally programmable current sink (RISET-based), with parallel operation supported for higher per-string current. Fault detection is latched during PWM low periods, and FAULT pin asserts low on any open LED string without disrupting active channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 16 independent current sinks, each programmable 10–50mA; supports paralleling for higher current per string. |
| Current Matching | ±2.8% max deviation across all 16 channels at 20mA; ensures uniform brightness in multi-string displays. |
| PWM Dimming Range | 3000:1 true-color ratio-preserves chromaticity at ultra-low duty cycles without color shift. |
| Switching Frequency | 100kHz–1MHz, set by RT resistor or synchronized to external clock via SYNC pin. |
| Max Output Voltage | 60V absolute max; OVP level programmable via OVPSET pin (e.g., 12.5V to 57V). |
| Junction Temp Range | –40°C to +125°C; guaranteed performance over full range for automotive under-hood use. |
| Package | 32-pin 5mm × 5mm QFN with exposed thermal pad (Pin 33 = GND); θJC = 3°C/W. |
Pinout & Package
LT3754IUH#TRPBF is housed in a thermally enhanced 32-pin plastic QFN (UH package), 5mm × 5mm body with exposed ground pad (Pin 33) requiring soldering to PCB copper for thermal management and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED8, LED17–LED24 (Pins 1–8, 17–24) | Constant-current sink outputs | Each drives one LED string cathode; current set by ISET resistor; open-fault tolerant. |
| ISET (Pin 32) | LED current programming reference | Single resistor to GND sets master current (10–50mA); defines all 16 channels' nominal current. |
| VOUT (Pin 16) | Boost converter output node | Supplies anode of all LED strings; voltage adapts dynamically to lowest VF string for efficiency. |
| FAULT (Pin 14) | Open-LED fault flag | Active-low open-drain output; asserts low if any LED string opens; latched during PWM low. |
| TSET (Pin 30) | Junction temperature breakpoint | Resistor divider from VREF programs thermal derating onset (e.g., 105°C); reduces LED current above threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT regulation | Maintains minimum 1.1V at lowest LEDx pin-reduces power loss by minimizing headroom across all strings. |
| True Color PWM™ dimming | 3000:1 ratio with no perceptible color shift-enables high-contrast HDR display backlighting. |
| Programmable thermal derating | CTRL and TSET pins allow linear LED current reduction vs. junction temperature-prevents thermal runaway. |
| Open-LED fault isolation | Single open string disables only its own current path; remaining 15 channels operate uninterrupted. |
| Synchronization capability | SYNC pin accepts external clock up to 1.5MHz; RT resistor set 20% below sync frequency for stable locking. |
Applications
| Automotive LCD Instrument Cluster Backlighting | Industrial HMI Display Backlighting |
|---|---|
Use Scenario: Driving 16 individually controlled LED strings behind segmented TFT-LCD gauges in vehicle instrument panels, operating continuously at –40°C to +125°C ambient. IC Role / Device Role / Timing Role: LED driver IC providing precise current matching and adaptive VOUT regulation to maintain consistent luminance across varying LED VF and temperature. Use Value: ±2.8% current matching prevents visible brightness gradients between segments; open-LED fault tolerance avoids total backlight failure during field operation. | Use Scenario: Powering high-reliability backlights for factory-floor HMIs exposed to vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: Constant-current LED controller with programmable OVP and thermal derating, interfaced to PLC-level PWM and analog control signals. Use Value: TSET-configured thermal derating extends LED lifetime in unventilated enclosures; FAULT pin enables predictive maintenance alerts. |
| Medical Diagnostic Monitor Backlighting | Avionics Cockpit Display Backlighting |
Use Scenario: Driving calibrated white LED arrays in diagnostic imaging monitors where color fidelity and dimming linearity are critical. IC Role / Device Role / Timing Role: Precision current source with 3000:1 True Color PWM dimming and <±0.7% typical current matching at 20mA. Use Value: Eliminates grayscale banding in low-brightness diagnostic images; maintains CIE chromaticity coordinates across full dimming range. | Use Scenario: Supplying redundant, fault-aware backlighting for primary flight displays in commercial aircraft, meeting DO-160 environmental and EMC requirements. IC Role / Device Role / Timing Role: Radiation-tolerant (qualified per AEC-Q100 Grade 1) LED driver with latchable FAULT signaling and robust UVLO hysteresis. Use Value: SHDN/UVLO pin's 1.476V threshold with 2.4µA hysteresis enables clean power sequencing; exposed pad enhances thermal reliability at altitude. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3754EUH#TRPBF | Same silicon, rated for 0°C to 125°C junction; lacks guaranteed –40°C startup and operation. | Suitable for commercial-grade displays but not automotive or industrial cold-start environments. | Select LT3754IUH#TRPBF when operation below –40°C is required; EUH variant reduces cost where ambient stays >0°C. |
| MAX16832ATL+T | 16-channel, but fixed 30mA/channel; no programmable OVP or TSET; max VOUT = 40V. | Lacks adaptive VOUT, thermal derating, and open-LED fault isolation-requires external monitoring. | Choose MAX16832ATL+T only for cost-sensitive, non-critical applications with stable VF and no thermal derating needs. |
Compared with LT3754EUH#TRPBF and MAX16832ATL+T, the LT3754IUH#TRPBF uniquely delivers guaranteed –40°C operation, user-programmable OVP clamping, and integrated thermal derating-making it the only option qualified for automotive instrument cluster backlighting per AEC-Q100 Grade 1.
Availability
LT3754IUH#TRPBF is available at Aetrix Electronics and suitable for automotive instrument clusters, medical diagnostic monitors, industrial HMIs, and avionics cockpit displays requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3754IUH#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 full technical and manufacturing continuity for legacy Linear products including the LT3754 family.
The LT3754 product line was designed specifically for high-channel-count, high-reliability LED backlighting in automotive, medical, and industrial applications-emphasizing fault resilience, thermal management, and precision current matching.
FAQ
What is the guaranteed operating temperature range for LT3754IUH#TRPBF?
The LT3754IUH#TRPBF is specified and guaranteed to operate from –40°C to +125°C junction temperature. This Grade I rating meets AEC-Q100 requirements for automotive under-hood applications and ensures reliable startup and regulation across extreme ambient conditions without derating.
How does LT3754IUH#TRPBF handle an open LED string fault?
The LT3754IUH#TRPBF monitors each LEDx pin voltage; if any falls below 0.5V (indicating open circuit), the FAULT pin pulls low. Crucially, the regulation loop ignores the open channel-remaining 15 strings continue regulated operation at full current, and VOUT adapts to the lowest active VF.
Can LT3754IUH#TRPBF drive more than 50mA per LED string?
Yes-LT3754IUH#TRPBF supports paralleling multiple LEDx channels (e.g., LED1 + LED2) to deliver up to 100mA per string while maintaining ±2.8% matching. The ISET resistor sets the per-channel current; paralleled channels sum their currents without additional components.
What is the purpose of the TSET pin on LT3754IUH#TRPBF?
The TSET pin on LT3754IUH#TRPBF programs the junction temperature threshold at which LED current begins linear derating. A resistor divider from VREF to TSET sets the breakpoint (e.g., 105°C); above this, current reduces proportionally to protect LEDs and extend lifetime in thermally constrained designs.
Does LT3754IUH#TRPBF require external compensation components?
Yes-LT3754IUH#TRPBF requires an RC network (resistor + capacitor in series) from VC pin to GND to stabilize both the LED and OVP error amplifiers. Component values depend on selected switching frequency and output capacitance; design guidelines are provided in the Applications Information section of the datasheet.
LT3754IUH#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)
LT3754IUH#TRPBF FAQ
1.How can I place an order for LT3754IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3754IUH#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 LT3754IUH#TRPBF reliable?
The price and inventory of LT3754IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3754IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3754IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3754IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3754IUH#TRPBF?
LT3754IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3754IUH#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 LT3754IUH#TRPBF?
For technical support, including LT3754IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3754IUH#TRPBF requirements.
6.How does Aetrix verify that LT3754IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3754IUH#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 LT3754IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3754IUH#TRPBF?
All LT3754IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3754IUH#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 LT3754IUH#TRPBF part is unused and in its original packaging.
Return procedure for LT3754IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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