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Analog Devices Inc. LT8374RUFM-1#WPBF
- Part No.:
- LT8374RUFM-1#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT8374RUFM-1#WPBF.pdf
- Description:
- 60V 1A SIMPLE LED DRIVER - 2MHz
- Quantity:
- Payment:
- Shipping:
Inventory:172
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Product details
Overview
LT8374RUFM-1#WPBF from Analog Devices is a 60V, 1.2A synchronous step-down LED driver IC with fixed-frequency peak-current control, designed for automotive matrix LED lighting. It delivers ±3% LED current regulation across 0V–59V LED string voltage, supports 20:1 analog/duty-cycle/PWM dimming, and operates at 2MHz switching frequency. Its wide 6.5V–60V input range and AEC-Q100 qualification make it suitable for high-reliability vehicle front lighting systems.
For engineers reviewing the LT8374RUFM-1#WPBF datasheet, LT8374RUFM-1#WPBF pinout, LT8374RUFM-1#WPBF application, or LT8374RUFM-1#WPBF equivalent, key selection criteria include its 2MHz internal frequency (vs. 330kHz in LT8374), 16-pin 4mm × 4mm side-solderable QFN package, spread-spectrum EMI reduction, internal 0.2nF/0.9nF compensation options, and dual-mode CTRL pin interface for analog voltage or digital duty-cycle programming of LED current.
Technical Context
The LT8374RUFM-1#WPBF implements a synchronous buck topology with integrated top/bottom MOSFETs (350mΩ/375mΩ RDS(on)) and a precision current-sense amplifier featuring 0V–VIN common-mode range-enabling high-side, low-side, or floating LED string configurations. Its peak-current control loop uses a 20µA accurate CTRL pin current source and a VC-compensation node supporting internal (0.2nF or 0.9nF) or external compensation networks.
Switching is governed by a 2MHz oscillator (LT8374-1 variant), synchronizable via SYNC/SPRD pin or configurable for spread-spectrum modulation (100%–125% frequency variation). Overvoltage protection triggers at FB = 1.1V, while thermal shutdown protects operation up to 150°C junction temperature. The device supports analog dimming (250mV–1.25V CTRL), digital duty-cycle control (12.5%–62.5%), and 100Hz–200Hz PWM dimming (1%–90% duty).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 60V - supports 12V/24V/48V automotive battery rails with transient tolerance. |
| LED Current Accuracy | ±3% - ensures consistent luminance across temperature and line/load variations. |
| Switching Frequency | 2MHz (fixed) - enables compact magnetics and reduces output ripple without sacrificing efficiency. |
| Current Sense Range | 0V to 59V LED string voltage - allows direct sensing in high-side, low-side, or matrix configurations. |
| CTRL Interface Modes | Analog (250mV–1.25V), duty-cycle (12.5%–62.5%), or PWM (100Hz–200Hz) - provides flexible dimming architecture. |
| Package & Thermal | 16-pin 4mm × 4mm side-solderable QFN with exposed GND pad (θJA = 32°C/W) - optimized for automotive thermal cycling and reflow compatibility. |
| AEC-Q100 Grade | Grade 1 (–40°C to +150°C TJ) - qualified for under-hood and headlamp module deployment. |
Pinout & Package
LT8374RUFM-1#WPBF is housed in a 16-pin, 4mm × 4mm plastic side-solderable QFN package (UFM) with an exposed GND pad (Pin 17) that must be soldered to the PCB for thermal and electrical integrity. Pin pitch is 0.5mm; side-solderable leads enable automated optical inspection (AOI) and high-reliability automotive assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/SPRD (1) | Synchronization & Spread-Spectrum Control | Drives external clock (2MHz) for synchronization; open or tied to INTVCC enables SSFM (100%–125% frequency dither). |
| FB (2) | Voltage Regulation Feedback | Monitors output voltage via resistor divider; trips OVLO at 1.1V to protect LED string from overvoltage. |
| ISP (3) / ISN (4) | Current Sense Inputs | Differential inputs to current-sense amplifier; support 0V–VIN common-mode range for flexible LED placement. |
| CTRL (5) | LED Current Programming | Accepts analog voltage (250mV–1.25V), digital duty cycle, or PWM signal to set regulated LED current. |
| CAP (6) | Compensation Capacitor Selection | GND selects 0.2nF/19kΩ internal network; float selects 0.9nF/27kΩ; INTVCC disables internal compensation. |
| VC (7) | Loop Compensation Node | Connects to external capacitor (or floats for internal compensation); stabilizes both current and voltage regulation loops. |
| GND (8,11,17) | Ground Terminals | Three dedicated GND pins plus exposed pad ensure low-impedance return path and thermal dissipation. |
| AVIN (9) | Analog Supply Input | Separate 6.5V–60V supply for precision analog circuitry; improves noise immunity vs. shared VIN rail. |
| INTVCC (10) | Internal Regulated Supply | Internally generated ~3.3V supply for gate drivers; bypassed with 2.2µF ceramic capacitor to GND. |
| VIN (12) | Main Power Input | High-current input for power switch conduction; requires local 0.47µF ceramic capacitor to adjacent GND. |
| BST (13) | Bootstrap Supply | Charged via internal diode from INTVCC; drives high-side MOSFET gate with 22nF BST–SW capacitor. |
| SW (14,15,16) | Power Switch Node | Internally paralleled switch outputs; connect directly to inductor; swing between VIN and GND at 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| 2MHz Fixed Switching Frequency | Enables use of sub-10µH inductors and <100µF ceramic output capacitors, reducing board area by >40% vs. 330kHz designs. |
| Spread-Spectrum Frequency Modulation | Reduces peak conducted EMI by >20dB at fundamental and harmonics-critical for CISPR 25 Class 5 compliance. |
| 20:1 Dimming Range via CTRL Pin | Supports seamless transition between analog voltage, digital duty-cycle, and PWM dimming without external logic. |
| 0V–59V LED String Voltage Range | Eliminates need for level-shifting circuits in high-side/matrix configurations; simplifies PCB layout and BOM. |
| Internal Compensation Options | Selectable 0.2nF or 0.9nF networks reduce component count and design iteration time for most LED loads. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive under-hood environments including thermal cycling, vibration, and long-term reliability testing. |
Applications
| Adaptive Front Lighting System (AFS) | Matrix LED Headlamp Module |
|---|---|
|
Use Scenario: Dynamic beam shaping in automotive headlamps using individually addressable LED segments. IC Role / Device Role / Timing Role: Primary LED current regulator per segment, enabling real-time on/off and dimming control via PWM or analog signals. Use Value: Delivers ±3% current matching across 12+ segments at 2MHz switching, minimizing visible flicker and enabling pixel-level beam control. |
Use Scenario: High-resolution glare-free headlight with 256+ controllable zones for highway and urban driving. IC Role / Device Role / Timing Role: Synchronous buck controller managing current in parallel LED strings with independent ISP/ISN sensing per zone. Use Value: 0V–59V sense range allows direct high-side sensing; spread-spectrum mode meets strict EMI limits for in-cabin RF-sensitive systems. |
| Commercial Vehicle Stop/Tail Light | Automotive Interior Ambient Lighting |
|
Use Scenario: High-brightness, thermally robust stop/tail lamp for trucks and buses operating at 24V nominal. IC Role / Device Role / Timing Role: Constant-current driver powering multiple parallel LED strings with overvoltage protection against load dump transients. Use Value: 60V absolute max rating and AEC-Q100 qualification ensure survival during ISO 7637-2 pulse 5a (75V/350ms) events. |
Use Scenario: Soft, uniform ambient lighting in instrument clusters and door panels requiring smooth dimming. IC Role / Device Role / Timing Role: Low-noise current source delivering stable illumination across temperature with 20:1 analog dimming resolution. Use Value: Internal 0.2nF compensation and 2MHz operation minimize audible noise and ripple, eliminating visible shimmer in diffused light guides. |
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 switches, requires external MOSFETs; 100kHz–1MHz adjustable frequency. | Used in non-automotive industrial LED drivers where board space is less constrained and external FETs are acceptable. | Select LTC3783EFE#PBF only when higher input voltage (>40V) is not required and discrete power stage optimization is prioritized. |
| LT3965EFE#PBF | 60V input, 1.2A, 4-channel matrix LED driver with I²C interface; 2MHz fixed frequency; includes fault reporting and channel enable. | Targeted at multi-string matrix systems requiring digital control and diagnostics-not single-string replacement. | Choose LT3965EFE#PBF for scalable multi-channel architectures; LT8374RUFM-1#WPBF remains optimal for cost-sensitive, single-string AFS modules. |
Compared with LTC3783EFE#PBF and LT3965EFE#PBF, the LT8374RUFM-1#WPBF offers superior integration (monolithic synchronous switches), tighter current regulation (±3% vs. ±5%), and automotive-grade qualification out-of-box-making it the preferred choice for production-ready matrix LED headlamp designs requiring minimal external components and guaranteed AEC-Q100 compliance.
Availability
LT8374RUFM-1#WPBF is available at Aetrix Electronics and suitable for automotive lighting, matrix LED headlamps, and commercial vehicle stop/tail lamp applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for LT8374RUFM-1#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 digital signal processing semiconductors, serving automotive, industrial, and communications markets with precision power and signal chain solutions.
The LT8374 product line was developed specifically for high-reliability, high-efficiency LED current regulation in automotive lighting systems-emphasizing AEC-Q100 compliance, EMI robustness, and simplified matrix implementation without external gate drivers or complex compensation.
FAQ
What is the key functional difference between LT8374RUFM-1#WPBF and LT8374RUFM#WPBF?
The LT8374RUFM-1#WPBF operates at a fixed 2MHz switching frequency, while the LT8374RUFM#WPBF runs at 330kHz. This higher frequency enables smaller passive components and reduced output ripple, making LT8374RUFM-1#WPBF ideal for space-constrained automotive headlamp modules. Both share identical pinout, package, and feature set-including AEC-Q100 qualification, spread-spectrum modulation, and CTRL pin dimming modes.
Does LT8374RUFM-1#WPBF support high-side current sensing in matrix LED configurations?
Yes, LT8374RUFM-1#WPBF supports true high-side current sensing due to its ISP/ISN amplifier's 0V to VIN common-mode input range. This allows direct placement of the sense resistor between the LED anode and ISP, with ISN tied to the LED cathode-eliminating level shifters and enabling precise per-string current control in multi-zone matrix layouts.
How does the CAP pin affect compensation network selection in LT8374RUFM-1#WPBF?
The CAP pin on LT8374RUFM-1#WPBF selects between two internal compensation networks: grounding CAP enables a 0.2nF capacitor in series with 19kΩ, while leaving CAP floating activates a 0.9nF/27kΩ network. These options cover typical LED loads without external components; connecting CAP to INTVCC disables internal compensation and requires external RC on VC.
Can LT8374RUFM-1#WPBF be synchronized to an external clock, and what are the timing requirements?
Yes, LT8374RUFM-1#WPBF accepts external synchronization on the SYNC/SPRD pin at exactly 2MHz. The input clock must have a high-level voltage ≥1.4V and fall within ±5% frequency tolerance. If the external clock stops, the device automatically reverts to its internal 2MHz oscillator-ensuring uninterrupted operation during transient sync loss.
What thermal derating guidance applies to LT8374RUFM-1#WPBF in automotive under-hood environments?
LT8374RUFM-1#WPBF is rated for –40°C to +150°C junction temperature. At 150°C, maximum continuous output current derates to 1.0A (from 1.2A at 25°C). To maintain full 1.2A capability, PCB layout must achieve ≤32°C/W θJA via adequate copper area, thermal vias under the exposed pad, and proper airflow-verified per JEDEC JESD51-2 standards.
LT8374RUFM-1#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:
- 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#WPBF FAQ
1.How can I place an order for LT8374RUFM-1#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8374RUFM-1#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-1#WPBF reliable?
The price and inventory of LT8374RUFM-1#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-1#WPBF is usually 5 days.
3.What payment methods are accepted for LT8374RUFM-1#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8374RUFM-1#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8374RUFM-1#WPBF?
LT8374RUFM-1#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8374RUFM-1#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-1#WPBF?
For technical support, including LT8374RUFM-1#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8374RUFM-1#WPBF requirements.
6.How does Aetrix verify that LT8374RUFM-1#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8374RUFM-1#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-1#WPBF meets industry standards.
7.What is the process for return or replacement of LT8374RUFM-1#WPBF?
All LT8374RUFM-1#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8374RUFM-1#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-1#WPBF part is unused and in its original packaging.
Return procedure for LT8374RUFM-1#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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