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Analog Devices Inc. LT8374RUFM-1#WTRPBF
- Part No.:
- LT8374RUFM-1#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT8374RUFM-1#WTRPBF.pdf
- Description:
- 60V 1A SIMPLE LED DRIVER - 2MHz
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
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Product details
Overview
LT8374RUFM-1#WTRPBF from Analog Devices is a 60V, 1.2A synchronous step-down LED driver IC with fixed-frequency peak-current control, ±3% LED current regulation, and AEC-Q100 qualification for automotive matrix lighting. It supports 2MHz switching, 0V–59V LED string voltage, and analog/PWM/duty-cycle LED current control via the CTRL pin.
For engineers reviewing the LT8374RUFM-1#WTRPBF datasheet, LT8374RUFM-1#WTRPBF pinout, LT8374RUFM-1#WTRPBF application, or LT8374RUFM-1#WTRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 16-pin QFN package mapping, and two confirmed automotive-grade alternatives with documented functional and application-level differences.
Technical Context
The LT8374RUFM-1#WTRPBF implements a monolithic synchronous buck topology with integrated high-side and low-side MOSFETs (350mΩ/375mΩ RDS(on)), peak-current mode control, and dual regulation loops: current regulation via ISP/ISN sense amplifier (33µA/V transconductance) and voltage regulation via FB pin (1.04V reference). Its 2MHz internal oscillator enables compact magnetics and low output ripple.
It features programmable LED current control through three independent methods: analog voltage (250mV–1.25V) on CTRL, digital duty-cycle input (12.5%–62.5%), or 100Hz–200Hz PWM dimming (1%–90% duty). Spread-spectrum frequency modulation (SSFM) reduces EMI by varying switching frequency from 100% to 125% of nominal 2MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2MHz fixed - enables small inductors (e.g., 68µH) and tight layout for high-density automotive PCBs. |
| LED Current Regulation Accuracy | ±3% - ensures consistent brightness across LED strings in matrix lighting without per-channel calibration. |
| Input Voltage Range | 6.5V to 60V - supports 12V/24V/48V automotive battery rails including cold-crank and load-dump transients. |
| LED String Voltage Range | 0V to 59V - accommodates single-LED to 12-LED strings (≈36V) with headroom for sensing and margin. |
| CTRL Pin Current Source | 20µA ±0.6µA - allows precise analog current programming using a single resistor (e.g., 37.4kΩ → 748mV → 49.8mV sense voltage). |
| Internal Compensation Options | 0.2nF or 0.9nF selectable via CAP pin - eliminates external compensation components for most matrix LED designs. |
| AEC-Q100 Grade | Grade 1 (–40°C to +150°C junction) - qualified for under-hood and headlamp applications requiring automotive reliability. |
Pinout & Package
LT8374RUFM-1#WTRPBF is housed in a 4mm × 4mm, 16-pin plastic side-solderable QFN package (UFM) with exposed thermal pad (Pin 17 = GND). The package supports automated optical inspection (AOI) and reflow-compatible side-wettable flanks for solder joint quality verification in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/SPRD (1) | Frequency control input | Accepts 2MHz external clock or enables SSFM when tied to INTVCC; must be grounded if unused to prevent noise coupling. |
| FB (2) | Voltage regulation feedback | Compares output voltage to 1.04V reference; used with ISP to limit max LED string voltage and prevent overvoltage failure. |
| ISP (3) / ISN (4) | Differential current sense inputs | Measure voltage across external sense resistor (e.g., 100mΩ); wide 0V–VIN common-mode range enables high-side or low-side sensing in matrix configurations. |
| CTRL (5) | LED current programming interface | Accepts analog voltage (250mV–1.25V), digital duty cycle (12.5%–62.5%), or 100Hz PWM - enables multi-mode dimming and system-level brightness control. |
| CAP (6) | Compensation capacitor select | Ground = 0.2nF internal cap; float = 0.9nF internal cap; INTVCC = external compensation - simplifies loop stability across load/temperature. |
| VC (7) | Loop compensation node | Connects to internal or external RC network; floating VC enables use of internal compensation - reduces BOM count in cost-sensitive designs. |
| GND (8,11,17) | Power and signal ground | Pins 8/11/17 are internally connected; exposed pad (17) must be soldered to PCB thermal plane for 32°C/W θJA performance. |
| AVIN (9) | Analog supply input | Separate 6.5V–60V rail for precision analog circuitry; improves PSRR and thermal performance vs. shared VIN in high-power matrix drivers. |
| INTVCC (10) | Internally regulated 3.3V supply | Powers gate drivers; requires 2.2µF ceramic bypass to GND near pin - critical for robust high-side switch turn-on during transients. |
| VIN (12) | Main power input | Supplies inductor current during high-side conduction; requires local 0.47µF ceramic + bulk capacitance to handle high di/dt switching currents. |
| BST (13) | Bootstrap supply for high-side driver | Requires 22nF ceramic capacitor to SW; internal diode charges BST during SW low phase - enables efficient 100% duty-cycle capability. |
| SW (14,15,16) | Power switch node | Internally paralleled pins drive external inductor; must be shorted together on PCB; voltage swings between VIN and GND at 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| 20:1 analog, duty-cycle, or PWM LED current control | Enables seamless integration with microcontroller GPIO, DAC outputs, or dedicated PWM generators - no external DAC or logic required. |
| Spread-spectrum frequency modulation (SSFM) | Reduces peak conducted EMI by >20dB at 2MHz and harmonics - helps pass CISPR 25 Class 5 without added ferrites or shielding. |
| 0V to 59V LED string voltage support | Allows direct driving of long LED strings (e.g., 12×3V) without intermediate boost stages - lowers system cost and improves efficiency. |
| Internal 0.2nF/0.9nF compensation capacitors | Eliminates need for external compensation components in >90% of matrix LED designs - accelerates layout, reduces debug time, and cuts BOM cost. |
| Wide common-mode ISP/ISN sense range (0V to VIN) | Permits flexible current sense placement - high-side sensing avoids ground contamination in multi-string matrix layouts with shared return paths. |
| AEC-Q100 Grade 1 qualification | Validated for operation from –40°C to +150°C junction temperature - meets automotive headlamp thermal requirements without derating. |
Applications
| Automotive Adaptive Front Lighting (AFS) | Matrix LED Headlamp Modules |
|---|---|
|
Use Scenario: Dynamic beam shaping in OEM headlamps using individually addressable LED segments to avoid glare while illuminating road signs and pedestrians. IC Role / Device Role / Timing Role: Primary LED current regulator per segment, providing fast (<100ns) current response and ±3% matching across 12+ channels. Use Value: Enables pixel-level beam control without external current DACs or op-amps - reduces channel count, PCB area, and thermal footprint per segment. |
Use Scenario: High-resolution lighting arrays in premium vehicle front fascias, where each LED string requires independent current regulation and fault reporting. IC Role / Device Role / Timing Role: Synchronous buck controller with ISP/ISN differential sensing and SSFM - delivers stable current under battery voltage transients (e.g., 6.5V cold crank). Use Value: Maintains consistent lumen output across 12V–48V input range and –40°C to +125°C ambient - eliminates brightness drift in extreme environments. |
| Commercial Vehicle Signage | Industrial Area Lighting Control |
|
Use Scenario: Redundant brake/tail light modules in trucks and buses requiring fail-safe current regulation and thermal shutdown under sustained overloads. IC Role / Device Role / Timing Role: AEC-Q100-compliant LED driver with 1.65A peak current limit and thermal shutdown - ensures compliance with FMVSS 108 and ECE R7. Use Value: Integrates protection functions (OVLO, UVLO, thermal shutdown) without external ICs - simplifies safety certification and reduces bill-of-materials. |
Use Scenario: Programmable high-bay lighting in warehouses where LED current must scale dynamically with occupancy sensor input or daylight harvesting signals. IC Role / Device Role / Timing Role: Analog/digital/PWM-controllable current source with 20:1 dimming range - accepts 0–10V, DALI, or microcontroller PWM inputs directly. Use Value: Eliminates need for external dimming interface ICs - supports multiple control protocols with one hardware design and firmware configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | 40V max input, 1.5A peak, no internal SSFM, requires external compensation | Targeted at industrial DC-DC conversion; lacks AEC-Q100 rating and matrix-specific ISP/ISN architecture | Choose for non-automotive, lower-voltage (<40V) constant-current supplies where SSFM is not required. |
| MAX20050ATP/V+T | 42V max input, 1.2A, 2.2MHz, AEC-Q100 Grade 1, but only analog CTRL (no PWM/duty-cycle modes) | Designed for single-string automotive lighting; lacks differential ISP/ISN sensing for matrix topologies | Choose when only analog dimming is needed and matrix-level differential sensing is unnecessary. |
Compared with LTC3783EFE#PBF and MAX20050ATP/V+T, the LT8374RUFM-1#WTRPBF uniquely combines 60V operation, AEC-Q100 Grade 1, 2MHz switching, and triple-mode (analog/PWM/duty-cycle) control in a single 16-pin QFN - making it the only option qualified for high-voltage matrix LED headlamps with multi-protocol dimming.
Availability
LT8374RUFM-1#WTRPBF is available at Aetrix Electronics and suitable for automotive adaptive lighting, matrix LED headlamp modules, and commercial vehicle signage requiring stable component supply, AEC-Q100 traceability, and long-term production continuity.
Supply support for LT8374RUFM-1#WTRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.
The LT8374RUFM-1#WTRPBF belongs to Analog Devices' Power by Linear™ LED driver product line, engineered specifically for automotive-grade matrix lighting systems requiring high accuracy, wide input range, and robust EMI performance in space-constrained packages.
FAQ
What is the key difference between LT8374RUFM-1#WTRPBF and the standard LT8374RUFM#WTRPBF?
The LT8374RUFM-1#WTRPBF is the -1 variant with a 2MHz internal switching frequency, whereas the base LT8374RUFM#WTRPBF operates at 330kHz. This higher frequency enables smaller external inductors and capacitors, reducing solution size and improving transient response - critical for compact automotive headlamp modules. Both share identical pinout, package, and AEC-Q100 qualification.
Does LT8374RUFM-1#WTRPBF support PWM dimming at frequencies other than 100Hz?
Yes, the LT8374RUFM-1#WTRPBF supports PWM dimming from 100Hz to 200Hz with 1%–90% duty cycle. At 100Hz, it achieves fine brightness resolution; at 200Hz, it eliminates visible flicker in fast-motion scenarios. The CTRL pin's 1.6V VIH and 400mV VIL thresholds ensure reliable detection across temperature and voltage variations in automotive environments.
How does the LT8374RUFM-1#WTRPBF handle short-circuit conditions in the LED string?
Under LED string short-circuit, the LT8374RUFM-1#WTRPBF limits inductor current using its 1.65A–2.35A peak current comparator. When current exceeds the limit, the device extends off-time until inductor current decays below 0.5A (recovery current), preventing thermal runaway. This behavior is documented in Figure 4 of the datasheet and ensures safe operation during fault conditions without external circuitry.
Can LT8374RUFM-1#WTRPBF drive multiple LED strings independently?
No - the LT8374RUFM-1#WTRPBF regulates current for a single LED string via its ISP/ISN sense inputs. However, multiple LT8374RUFM-1#WTRPBF devices can be synchronized using the SYNC/SPRD pin to eliminate beat frequencies in multi-string matrix systems. Each IC requires its own sense resistor and inductor, enabling true per-string control.
What is the role of the AVIN pin on LT8374RUFM-1#WTRPBF, and when should it be separated from VIN?
The AVIN pin powers the precision analog circuitry (error amplifiers, references, CTRL buffer), while VIN supplies the power switches. Separating AVIN from VIN - e.g., tying AVIN to a clean 12V rail - reduces noise coupling into the current regulation loop, improving LED current accuracy during high di/dt switching events. This separation is recommended for high-precision matrix lighting where current matching <±3% is critical.
LT8374RUFM-1#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 0V ~ 59V
- Current - Output / Channel:
- 1.2A
- Frequency:
- 2MHz
- Dimming:
- Analog, PWM
- Applications:
- General Purpose
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 16-QFN (4x4)
LT8374RUFM-1#WTRPBF FAQ
1.How can I place an order for LT8374RUFM-1#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8374RUFM-1#WTRPBF 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 LT8374RUFM-1#WTRPBF reliable?
The price and inventory of LT8374RUFM-1#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8374RUFM-1#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8374RUFM-1#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8374RUFM-1#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8374RUFM-1#WTRPBF?
LT8374RUFM-1#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8374RUFM-1#WTRPBF 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 LT8374RUFM-1#WTRPBF?
For technical support, including LT8374RUFM-1#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8374RUFM-1#WTRPBF requirements.
6.How does Aetrix verify that LT8374RUFM-1#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8374RUFM-1#WTRPBF 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 LT8374RUFM-1#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8374RUFM-1#WTRPBF?
All LT8374RUFM-1#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8374RUFM-1#WTRPBF, 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 LT8374RUFM-1#WTRPBF part is unused and in its original packaging.
Return procedure for LT8374RUFM-1#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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