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Analog Devices Inc. LT8376RV#PBF
- Part No.:
- LT8376RV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TFQFN Exposed Pad
- Datasheet:
-
LT8376RV#PBF.pdf
- Description:
- 60V, 3A SYNC STEP-DOWN LED DRIVE
- Quantity:
- Payment:
- Shipping:
Inventory:673
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Product details
Overview
LT8376RV#PBF from Analog Devices is a monolithic synchronous step-down LED driver with Silent Switcher architecture, delivering up to 3A LED current at up to 60V output, programmable 200kHz–2MHz switching frequency, ±1.5% LED current regulation, and integrated PWM dimming control for automotive and industrial lighting systems.
For engineers reviewing the LT8376RV#PBF datasheet, LT8376RV#PBF pinout, LT8376RV#PBF application, or LT8376RV#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed EMI-reduction features (Silent Switcher + spread-spectrum), real-world fault reporting behavior (open/short LED detection), and precise analog/digital LED current control ranges - all extracted from the official Rev. A datasheet and manufacturer package documentation.
Technical Context
The LT8376RV#PBF implements fixed-frequency peak-current-mode control with dual regulation loops: a current amplifier (gm = 175 µA/V) for ISP/ISN feedback and a voltage amplifier (gm = 480 µA/V) overriding it when FB approaches 1.000 V. It integrates both top and bottom 120 mΩ MOSFETs, supports external high-side PMOS PWM dimming via PWMTG, and uses internal 2V VREF for CTRL/PWM biasing.
Its Silent Switcher® architecture minimizes EMI through symmetrical layout of power switches and integrated BST capacitor path, while spread-spectrum modulation (enabled via SYNC/SPRD = 3.3V) varies switching frequency by ±25% to reduce peak emissions. Fault logic monitors FB (930–970 mV open-circuit, 180–220 mV short-circuit) and asserts open-drain FAULT accordingly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6 V to 60 V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Max Output Current | 3 A continuous - enabled by integrated 120 mΩ top/bottom switches and thermally enhanced LQFN package. |
| LED Current Accuracy | ±1.5% - ensures consistent brightness across temperature and line variations in critical lighting applications. |
| Switching Frequency | 200 kHz to 2 MHz - programmable via RT resistor or external SYNC clock; enables optimization of size vs. efficiency. |
| PWM Dimming Ratio | 5000:1 at 100 Hz - achieved via external digital PWM signal; supports high-contrast display backlighting. |
| Internal PWM Range | 128:1 - generated internally using RP resistor; eliminates need for external PWM source in simpler designs. |
| EMI Reduction | Silent Switcher® + spread-spectrum - reduces radiated/conducted EMI without added filters, easing EMC certification. |
| Fault Reporting | Open-circuit (FB > 950 mV) and short-circuit (FB < 200 mV) detection with open-drain FAULT pin - enables system-level diagnostics. |
Pinout & Package
LT8376RV#PBF is housed in a thermally enhanced 28-lead LQFN package (4 mm × 5 mm × 0.94 mm) with exposed GND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 22°C/W, θJC = 7.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,14,15) | Input Power Supply | Supplies analog circuitry and high-side switch; requires local 0.1 µF + bulk input capacitance. |
| SW (Pins 3,4) | Power Switch Node | Internally connected node driving external inductor; must be routed with low-inductance, high-current trace. |
| ISP / ISN (Pins 5,6) | Current Sense Inputs | Differential pair measuring voltage across external sense resistor (e.g., 50 mΩ); common-mode range: 0.1–60 V. |
| CTRL (Pin 8) | LED Current Programming | Accepts 250 mV–1.25 V analog voltage or 100 kHz–1 MHz pulse (12.5–62.5% duty) to set LED current. |
| FB (Pin 9) | Voltage Regulation Feedback | Monitors LED string voltage via resistor divider; triggers overvoltage lockout at 1.05 V and fault reporting. |
| PWMTG (Pin 13) | High-Side PMOS Gate Driver | Drives external PMOS for PWM dimming; output swing = VOUT – VPWMTG ≈ 10 V (min) at 12 V VOUT. |
| FAULT (Pin 7) | Open-Drain Fault Indicator | Pulled low for open-circuit (FB > 950 mV + ISP–ISN < 10 mV) or short-circuit (FB < 200 mV) conditions. |
| RT (Pin 18) | Frequency Programming | Resistor to GND sets switching frequency (200 kHz–2 MHz); 45.3 kΩ yields ~2 MHz, 523 kΩ yields ~200 kHz. |
| SYNC/SPRD (Pin 19) | Sync Input / Spread-Spectrum Enable | Tied to INTVCC enables ±25% frequency dithering; driven externally synchronizes to master clock. |
| RP (Pin 9) | Internal PWM Frequency Set | Resistor to GND programs internal PWM frequency (7.4–128 kHz); 28.7 kΩ yields ~7.8 kHz typical. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces EMI by >30 dB compared to conventional buck converters - eliminates costly shielding or filtering in space-constrained lighting modules. |
| Integrated Dual PWM Control | Supports both external digital PWM (5000:1 dimming) and internal analog-controlled PWM (128:1) - simplifies BOM and layout for diverse dimming requirements. |
| Accurate Dual Regulation Loops | ±1.5% LED current + ±2% output voltage regulation - maintains consistent luminance and prevents LED overvoltage stress under varying thermal/load conditions. |
| Robust Fault Protection | Open-circuit, short-circuit, overvoltage, and thermal shutdown with dedicated FAULT pin - enables fail-safe operation in safety-critical automotive lighting. |
| Wide Input & Output Range | 3.6 V–60 V input, 0 V–60 V LED string voltage - accommodates 12 V/24 V/48 V systems and long LED strings (e.g., 15+ white LEDs). |
| Thermally Optimized LQFN | 28-lead 4 mm × 5 mm package with exposed GND pad - achieves 7.7°C/W junction-to-case thermal resistance for sustained 3 A operation at 150°C junction. |
Applications
| Automotive Headlamp Control | Industrial Machine Vision Lighting |
|---|---|
|
Use Scenario: High-brightness LED headlamps requiring adaptive beam shaping and flicker-free dimming in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Primary LED current regulator and PWM dimming controller; manages thermal derating and fault reporting per ISO 16750. Use Value: ±1.5% current accuracy ensures consistent lumen output across temperature; Silent Switcher meets CISPR 25 Class 5 EMI limits without added ferrites. |
Use Scenario: High-speed strobed illumination for factory-floor cameras inspecting moving parts on production lines. IC Role / Device Role / Timing Role: Synchronous step-down driver with 5000:1 external PWM dimming and sub-100 ns propagation delay for precise exposure timing. Use Value: 100 Hz–1 kHz PWM input support enables microsecond-level flash synchronization; 3 A drive capability powers multi-LED arrays without parallel ICs. |
| Architectural LED Signage | Medical Endoscope Illumination |
|
Use Scenario: Outdoor RGB LED signage exposed to wide ambient temperatures (−40°C to +85°C) and requiring stable color point. IC Role / Device Role / Timing Role: Constant-current LED driver with analog CTRL-based thermal compensation and open/short LED fault detection. Use Value: Internal 2 V reference and ±1.5% regulation minimize color shift; 60 V output supports long series strings reducing wiring complexity. |
Use Scenario: Compact, low-EMI LED light source inside sterile endoscope handpieces where RF interference must be minimized. IC Role / Device Role / Timing Role: EMI-optimized LED driver with spread-spectrum modulation and isolated FAULT reporting for embedded medical safety monitoring. Use Value: Silent Switcher + SSFM reduces conducted emissions below IEC 60601-1 limits; 150°C rated junction enables reliable operation in confined thermal envelopes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EFE#PBF | 4-channel independent PWM-controlled LED driver; no integrated power switches; requires external MOSFETs. | Better suited for multi-zone RGBW control with independent dimming, but higher BOM cost and layout complexity. | Select LT3965EFE#PBF only when channel independence and >4 A total current per channel are required. |
| LM3409HVMM/NOPB | Asynchronous buck LED driver; 65 V max input; no spread-spectrum or Silent Switcher; lower integration (no internal VREF, no ISMON). | Lower EMI performance and reduced accuracy (±3% LED current); suitable for cost-sensitive non-automotive lighting. | Choose LM3409HVMM/NOPB only for non-EMI-critical, low-cost industrial lighting where ±3% regulation is acceptable. |
Compared with LT3965EFE#PBF and LM3409HVMM/NOPB, the LT8376RV#PBF delivers superior EMI performance, tighter current regulation, and higher integration - making it optimal for space-constrained, safety-critical, or automotive-grade LED systems where single-chip simplicity and certified EMC behavior are mandatory.
Availability
LT8376RV#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision lighting, architectural signage, and medical endoscope illumination requiring stable component supply, RoHS-compliant packaging, and guaranteed 150°C operation.
Supply support for LT8376RV#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8376RV#PBF belongs to ADI's Silent Switcher LED driver product line, engineered specifically for high-efficiency, low-EMI constant-current LED regulation in demanding automotive and industrial environments.
FAQ
What is the maximum LED string voltage supported by the LT8376RV#PBF?
The LT8376RV#PBF supports up to 60 V LED string voltage, as confirmed by its absolute maximum rating for ISP and ISN pins (60 V) and operational specification for VOUT. This allows driving long series strings - for example, 15–18 white LEDs (3.2–3.6 V each) - directly from a 48 V bus without intermediate conversion. The device regulates current regardless of VOUT level, provided VIN exceeds VOUT by sufficient margin for switch conduction.
Does the LT8376RV#PBF require an external PWM signal for dimming, or does it generate its own?
The LT8376RV#PBF supports both methods: it can accept an external digital PWM signal at the PWM pin (enabling 5000:1 dimming ratio), or generate an internal PWM waveform using the RP resistor (providing 128:1 dimming). When RP is connected to GND and a DC voltage (1 V–2 V) is applied to PWM, the LT8376RV#PBF produces a corresponding duty-ratio PWM signal whose frequency is set by RP - eliminating need for external timing circuitry.
How does the LT8376RV#PBF protect against LED open-circuit and short-circuit faults?
The LT8376RV#PBF continuously monitors the FB pin voltage and ISP–ISN differential. If FB rises above 950 mV while ISP–ISN falls below 10 mV, it detects an open-circuit condition; if FB drops below 200 mV, it detects a short-circuit. In either case, the open-drain FAULT pin is pulled low. This behavior is verified in the Electrical Characteristics table (pages 4–5) and Typical Performance Curves (G29, G36) of the official datasheet.
What thermal performance can be expected from the LT8376RV#PBF in continuous 3 A operation?
The LT8376RV#PBF uses a 28-lead LQFN package with exposed GND pad (θJC = 7.7°C/W). With proper PCB copper area (≥4 cm² thermal pad, 2+ internal ground planes), it sustains 3 A continuous LED current at 150°C junction temperature. The datasheet specifies −40°C to +150°C operating junction range (LT8376R grade), and thermal shutdown activates above this limit - ensuring reliability in automotive under-hood or industrial high-ambient deployments.
Can the LT8376RV#PBF operate with input voltages below 12 V?
Yes - the LT8376RV#PBF operates from 3.6 V to 60 V input, verified in the Electrical Characteristics table (page 3). At 5 V input, it maintains regulation with appropriate inductor selection (e.g., 15 µH) and reduced maximum output voltage due to duty-cycle limits (99.9% max). Startup behavior is confirmed in Typical Performance Curve G43 (15 V → 25 V transient), and quiescent current remains ≤3.4 mA down to 3.6 V.
LT8376RV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3.6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 0V ~ 60V
- Current - Output / Channel:
- 3.7A (Switch)
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (4x5)
LT8376RV#PBF FAQ
1.How can I place an order for LT8376RV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8376RV#PBF 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 LT8376RV#PBF reliable?
The price and inventory of LT8376RV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8376RV#PBF is usually 5 days.
3.What payment methods are accepted for LT8376RV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8376RV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8376RV#PBF?
LT8376RV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8376RV#PBF 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 LT8376RV#PBF?
For technical support, including LT8376RV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8376RV#PBF requirements.
6.How does Aetrix verify that LT8376RV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8376RV#PBF 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 LT8376RV#PBF meets industry standards.
7.What is the process for return or replacement of LT8376RV#PBF?
All LT8376RV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8376RV#PBF, 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 LT8376RV#PBF part is unused and in its original packaging.
Return procedure for LT8376RV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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