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Analog Devices Inc. LT8374RUFM#WPBF
- Part No.:
- LT8374RUFM#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT8374RUFM#WPBF.pdf
- Description:
- 60V 1A SIMPLE LED DRIVER - 330KH
- Quantity:
- Payment:
- Shipping:
Inventory:4,657
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Product details
Overview
LT8374RUFM#WPBF from Analog Devices is a 60V, 1.2A monolithic synchronous step-down LED driver IC with fixed-frequency peak-current control, ±3% LED current regulation, and 330kHz internal switching frequency. It supports analog/duty-cycle/PWM dimming, 0V–59V LED string voltage, and AEC-Q100 automotive qualification for matrix lighting systems.
For engineers reviewing the LT8374RUFM#WPBF datasheet, LT8374RUFM#WPBF pinout, LT8374RUFM#WPBF application, or LT8374RUFM#WPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 150°C), and real-world matrix LED driver implementation details - not generic DC/DC converter generalities.
Technical Context
The LT8374RUFM#WPBF integrates dual power switches, a 330kHz oscillator, and a high-side gate driver with BST capacitor support. Its current-sense amplifier features 0V–VIN common-mode range, enabling direct high-side sensing in matrix configurations where ISP/ISN straddle the LED string anode/cathode.
It implements peak-current mode control with programmable internal compensation (0.2nF or 0.9nF), spread-spectrum modulation via SYNC/SPRD pin, and dual-loop regulation: primary LED current control via CTRL pin (20µA source, 250mV–1.25V analog range) and secondary output voltage limiting via FB–ISP resistor network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 60V - supports 12V/24V/48V automotive battery rails and transient overvoltage tolerance. |
| Max Output Current | 1.2A - guaranteed continuous LED current with ±3% regulation accuracy across temperature. |
| Switching Frequency | 330kHz - fixed internal frequency; enables compact magnetics while balancing EMI and efficiency. |
| LED String Voltage | 0V to 59V - accommodates up to ~18 white LEDs (3.3V each) or high-voltage matrix topologies. |
| CTRL Interface | 20µA current source + 100Hz–200kHz PWM input - enables precise analog dimming or high-resolution digital brightness control. |
| Package Thermal Resistance | θJA = 32°C/W - measured on EVAL-LT8374-AZ; enables 1.2A operation without forced air at ambient ≤85°C. |
| AEC-Q100 Grade | Grade 1 (–40°C to +150°C junction) - qualified for under-hood automotive lighting applications. |
Pinout & Package
LT8374RUFM#WPBF uses a 4mm × 4mm, 16-pin side-solderable QFN package (UFM) with exposed thermal pad (Pin 17 = GND). All GND pins (8, 11, 17) must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/SPRD (1) | Frequency control input | Open or tied to INTVCC enables spread-spectrum EMI reduction; driven at 330kHz enables external synchronization. |
| FB (2) | Voltage regulation feedback | Compares against 1.04V reference; used with ISP to limit max LED string voltage (e.g., 17V clamp). |
| ISP (3) / ISN (4) | Differential current sense inputs | Accept 0V–VIN common-mode voltage; measure voltage across external sense resistor for LED current regulation. |
| CTRL (5) | Dimming and current programming | 20µA current source sets analog current level; also accepts 100Hz–200kHz PWM for linear brightness control. |
| CAP (6) | Compensation selection | GND selects 0.2nF internal cap; float selects 0.9nF; INTVCC disables internal compensation for external loop design. |
| VC (7) | Loop compensation node | Connects to GND via capacitor (or RC network) to stabilize current/voltage regulation loops. |
| GND (8, 11, 17) | Power and signal ground | Three dedicated GND pins plus exposed pad - mandatory low-impedance connection to PCB ground plane. |
| AVIN (9) | Analog supply input | Separate 6.5V–60V rail for precision analog circuitry; improves thermal performance when decoupled from VIN. |
| INTVCC (10) | Internal LDO output | 3.3V regulated supply for gate drivers; bypass with 2.2µF ceramic capacitor to GND. |
| VIN (12) | Main power input | 6.5V–60V input to high-side switch; requires local 0.47µF ceramic capacitor adjacent to Pin 11 (GND). |
| BST (13) | Bootstrap supply | Connects 22nF capacitor to SW; internal diode from INTVCC charges BST during low-SW phase. |
| SW (14–16) | Switch node | Internally connected pins driving external inductor; swing between VIN and GND at 330kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-input, high-voltage LED driver | Operates from 6.5V to 60V input while regulating up to 59V LED string - eliminates need for pre-regulator in 48V bus systems. |
| Matrix-compatible current sensing | 0V to VIN common-mode range on ISP/ISN enables direct high-side sensing in multi-string matrix architectures without level-shifting. |
| Triple dimming interface | Supports 20µA-based analog control (250mV–1.25V), duty-cycle programming (12.5%–62.5%), and 100Hz PWM (1%–90%) - enables flexible system-level brightness management. |
| Automotive-grade thermal robustness | Rated for –40°C to +150°C junction temperature with integrated thermal shutdown - validated per AEC-Q100 Grade 1 requirements. |
| EMI-reduction architecture | Integrated spread-spectrum modulation (100%–125% frequency variation) reduces peak conducted emissions without external filters. |
Applications
| Automotive Adaptive Front Lighting | Dynamic Matrix LED Headlamps |
|---|---|
|
Use Scenario: Individual LED segments in headlamp modules are independently switched and dimmed to create adaptive beam patterns (e.g., glare-free high-beam). IC Role / Device Role / Timing Role: LT8374RUFM#WPBF acts as per-string current regulator, accepting PWM commands from MCU to enable real-time pixel-level illumination control. Use Value: ±3% current matching across strings ensures uniform luminance; 330kHz switching enables fast response (<100µs) to beam-shaping commands. |
Use Scenario: High-resolution LED arrays (e.g., 12+ individually addressable strings) require compact, thermally efficient drivers mounted directly behind optics. IC Role / Device Role / Timing Role: LT8374RUFM#WPBF serves as matrix string controller with ISP/ISN placed on high-side of each LED string for simplified PCB routing. Use Value: 4mm × 4mm QFN package fits tight optical module spacing; AEC-Q100 qualification ensures reliability in sealed, high-temp headlamp housings. |
| Commercial Vehicle Rear Lighting | Industrial Area Lighting Control |
|
Use Scenario: Heavy-duty truck tail lamps use long LED strings powered from 24V battery with wide load/transient variations. IC Role / Device Role / Timing Role: LT8374RUFM#WPBF regulates constant current through 12–16 LED strings despite 18V–32V input swings and cold-crank transients. Use Value: 60V absolute max rating and 6.5V UVLO protect against load-dump spikes; ±3% regulation maintains consistent brake light intensity across voltage range. |
Use Scenario: Smart factory lighting systems require programmable dimming, fault reporting, and long-life operation in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: LT8374RUFM#WPBF provides stable current regulation for high-bay LED fixtures, interfacing with DALI or 0–10V controllers via CTRL pin. Use Value: Internal 0.9nF compensation simplifies layout for 2MHz variant compatibility; thermal shutdown prevents field failures in enclosed fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8374RUFM-1#WPBF | 2MHz switching frequency vs. 330kHz; identical pinout, package, and feature set. | Better suited for ultra-compact designs requiring smaller inductors/capacitors; higher switching loss at full load. | Select LT8374RUFM-1#WPBF only when board space constraints demand <2MHz magnetics and thermal budget allows. |
| LM3409QMYX/NOPB | Adjustable 100kHz–1MHz frequency; no internal spread-spectrum; lower max input (42V); non-AEC-Q100. | Cost-optimized industrial LED drivers where automotive qualification and EMI certification are not required. | Choose LM3409QMYX/NOPB for non-automotive, cost-sensitive applications with <42V input and relaxed EMI limits. |
Compared with LT8374RUFM-1#WPBF, the LT8374RUFM#WPBF offers lower EMI and higher efficiency at medium loads due to 330kHz operation, while LM3409QMYX/NOPB lacks AEC-Q100 validation and spread-spectrum capability - making LT8374RUFM#WPBF the sole choice for automotive matrix lighting compliance.
Availability
LT8374RUFM#WPBF is available at Aetrix Electronics and suitable for automotive adaptive lighting, commercial vehicle rear lamps, industrial high-bay fixtures, and matrix LED signage requiring stable component supply, AEC-Q100 traceability, and long-term production continuity.
Supply support for LT8374RUFM#WPBF 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 DSP technologies, serving automotive, industrial, and communications markets with precision power management solutions.
The LT8374 product line was designed specifically for high-reliability, high-voltage LED matrix applications in automotive lighting - delivering integrated current regulation, EMI control, and AEC-Q100 compliance in a thermally optimized QFN package.
FAQ
What is the maximum LED string voltage supported by the LT8374RUFM#WPBF?
The LT8374RUFM#WPBF supports LED string voltages from 0V to 59V, enabled by its 0V–VIN current-sense common-mode range and internal 60V-rated power switches. This allows direct drive of long LED strings (e.g., 18× white LEDs at 3.3V) without intermediate buck stages, and is confirmed in the Absolute Maximum Ratings table and Typical Application schematics.
Does the LT8374RUFM#WPBF support PWM dimming, and what are the valid frequency/duty cycle ranges?
Yes, the LT8374RUFM#WPBF supports PWM dimming via its CTRL pin with a valid input frequency range of 100Hz to 200kHz and duty cycle range of 1% to 90%. At 100Hz, it achieves linear brightness control with fine resolution; the device disables switching below 10% duty cycle, as specified in the Electrical Characteristics table and Applications Information section.
How does spread-spectrum frequency modulation work on the LT8374RUFM#WPBF, and how is it enabled?
Spread-spectrum frequency modulation (SSFM) on the LT8374RUFM#WPBF varies the switching frequency from 100% to 125% of its nominal value (330kHz) to reduce EMI peaks. It is enabled by leaving the SYNC/SPRD pin open or tying it to INTVCC - no external components required. SSFM operation is verified in Figure 3 (conducted emissions test) and the Features list.
What is the purpose of the CAP pin on the LT8374RUFM#WPBF, and what compensation options does it provide?
The CAP pin on the LT8374RUFM#WPBF selects between two internal compensation networks: grounding CAP enables a 0.2nF capacitor in series with 19kΩ, while floating CAP enables a 0.9nF capacitor in series with 27kΩ. These are intended for most standard LED driver designs; connecting CAP to INTVCC disables internal compensation for custom external loop design, as detailed in the PIN FUNCTIONS section.
Is the LT8374RUFM#WPBF qualified for automotive applications, and what grade does it meet?
Yes, the LT8374RUFM#WPBF is AEC-Q100 qualified for automotive applications and rated Grade 1 (–40°C to +150°C junction temperature). This qualification is explicitly stated in the FEATURES section, ORDER INFORMATION table, and Automotive Products footnote - confirming suitability for under-hood and headlamp module deployment.
LT8374RUFM#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 300kHz
- 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#WPBF FAQ
1.How can I place an order for LT8374RUFM#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8374RUFM#WPBF 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#WPBF reliable?
The price and inventory of LT8374RUFM#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8374RUFM#WPBF is usually 5 days.
3.What payment methods are accepted for LT8374RUFM#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8374RUFM#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8374RUFM#WPBF?
LT8374RUFM#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8374RUFM#WPBF 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#WPBF?
For technical support, including LT8374RUFM#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8374RUFM#WPBF requirements.
6.How does Aetrix verify that LT8374RUFM#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8374RUFM#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8374RUFM#WPBF?
All LT8374RUFM#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8374RUFM#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8374RUFM#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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