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Analog Devices Inc. LT8386JV#PBF
- Part No.:
- LT8386JV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TFQFN Exposed Pad, 26 Leads
- Datasheet:
-
LT8386JV#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 3A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:446
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Product details
Overview
LT8386JV#PBF from Analog Devices is a monolithic, synchronous step-up LED driver IC with Silent Switcher® architecture, delivering 3A output current at up to 52V LED string voltage, 2% LED current regulation accuracy, and programmable 200kHz–2MHz switching frequency. It supports analog/digital CTRL input, internal PWM dimming (1%/5%/10%), and AEC-Q100 Grade 1 qualification for automotive lighting systems.
For engineers reviewing the LT8386JV#PBF datasheet, LT8386JV#PBF pinout, LT8386JV#PBF application, or LT8386JV#PBF equivalent, key selection considerations include its 60V absolute max input/output rating, integrated high-side PMOS gate driver (PWMTG), open/short LED fault detection with FAULT pin assertion, and compatibility with 4mm × 5mm LQFN-28 package layouts used in space-constrained HUD and headlamp modules.
Technical Context
The LT8386JV#PBF implements fixed-frequency peak-current-mode control with dual error amplifiers: a 140µA/V transconductance current amplifier (ISP/ISN feedback) and a 1000µA/V voltage amplifier (FB loop). Its oscillator supports RT-resistor programming or external SYNC clock injection, with optional spread-spectrum modulation via SYNC/SPRD pin biasing to reduce EMI peaks.
It integrates adaptive peak switch current limiting (up to 5A at low VIN), internal 2V reference (VREF), and a dedicated ISMON pin providing 10mV/mV buffered sense voltage for real-time LED current monitoring. The PWMTG driver delivers 10.5–12.5V gate drive relative to VOUT for external high-side PMOS dimming switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 56V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (56V) conditions |
| Max Output LED Voltage | 52V - enables driving up to 16 white LEDs (3.2V each) in series without overvoltage risk |
| LED Current Regulation Accuracy | ±2% - ensures consistent luminance across temperature (−40°C to +150°C junction) |
| Switching Frequency Range | 200kHz to 2MHz - allows EMI-sensitive designs to shift above AM band or optimize efficiency vs. size trade-off |
| Junction Temperature Range | −40°C to +150°C - qualified per AEC-Q100 Grade 1 for under-hood and headlamp applications |
| Package | 28-Lead 4mm × 5mm LQFN - exposes thermal pad (Pin 29) for direct PCB soldering to manage 3A power dissipation |
| PWM Dimming Resolution | 50,000:1 at 100Hz - enables ultra-fine brightness control in machine vision and adaptive lighting |
Pinout & Package
LT8386JV#PBF uses a 28-lead LQFN package (4mm × 5mm) with exposed thermal pad (Pin 29 = GND). All GND pins (22, 23, 29) must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1, 27, 28) | Power Switch Node | Internally connected high-side/low-side switch terminals; ties inductor to GND or VOUT; must be shorted together on PCB |
| BST (2) | Bootstrap Supply | Drives top switch gate via 33nF capacitor to SW; internal diode charges capacitor during low-SW phase |
| ISP / ISN (9, 10) | Differential Current Sense Inputs | Kelvin-connected across external sense resistor; enables ±2% LED current regulation independent of VOUT |
| CTRL (8) | Analog/Digital Current Setpoint | Accepts 0.25–1.25V analog voltage or 12.5–62.5% duty-cycle pulses to program LED current without external DAC |
| PWMTG (20) | High-Side PMOS Gate Driver | Provides 10.5–12.5V gate drive referenced to VOUT; drives external PMOS for PWM dimming with <140ns propagation delay |
| FAULT (15) | Open/Short LED Fault Indicator | Active-low open-drain output asserting on VFB >1.14V + (ISP−ISN)<10mV (open) or (ISP−ISN)>150mV (short) |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Ultralow EMI emissions achieved via symmetrical layout, integrated hot-loop capacitors, and balanced switching node routing - reduces need for shielding or ferrites |
| Spread Spectrum Frequency Modulation | 125% frequency dithering (SYNC/SPRD = 3V) spreads EMI energy across bandwidth, easing CISPR 25 Class 5 compliance |
| Adaptive Peak Switch Current Limit | Up to 5A at VIN = 5V - maintains full LED current during cold-start while preventing inductor saturation |
| Internal PWM Dimming Presets | Factory-trimmed 1%, 5%, and 10% duty cycles (via RP resistor + PWM pin voltage) eliminate external timing components for precise low-duty dimming |
| AEC-Q100 Grade 1 Qualification | Validated for −40°C to +150°C operation with HTOL, TC, and ESD testing - suitable for front-end automotive lighting without derating |
Applications
| Automotive Headlamps | Heads-Up Display (HUD) |
|---|---|
Use Scenario: High-brightness LED arrays in adaptive driving beam (ADB) headlamps requiring precise current matching and thermal stability across engine bay temperatures. IC Role / Device Role / Timing Role: Primary boost LED driver regulating 3A through 12–16 LED strings, with FAULT pin interfacing to vehicle CAN bus diagnostics. Use Value: ±2% current regulation and AEC-Q100 Grade 1 qualification ensure consistent lumen output and functional safety compliance over lifetime. |
Use Scenario: Compact projection-based HUDs using RGB LED sources where space constraints demand minimal external components and low EMI. IC Role / Device Role / Timing Role: Synchronous boost controller generating stable 45V/300mA for green LED string, with 2MHz switching enabling tiny 4.7µH inductor. Use Value: Silent Switcher architecture eliminates radiated noise that would distort projected imagery; 50,000:1 PWM dimming enables seamless brightness adaptation to ambient light. |
| Industrial Machine Vision | Aviation Exterior Lighting |
Use Scenario: Stroboscopic LED illuminators for high-speed inspection systems requiring microsecond-level PWM timing accuracy and repeatable intensity. IC Role / Device Role / Timing Role: LED current source with internal 125Hz PWM generator (RP = 332kΩ) and 100ns PWMTG propagation delay for precise flash synchronization. Use Value: Internal PWM presets eliminate jitter from external clock sources; ISMON pin provides real-time current telemetry for closed-loop intensity calibration. |
Use Scenario: Wingtip/navigation lights in commercial aircraft requiring DO-160G Section 20 Level A EMC compliance and extended temperature operation. IC Role / Device Role / Timing Role: Boost converter powering 52V LED strings with spread spectrum enabled (SYNC/SPRD = INTVCC) to suppress narrowband emissions in avionics bands. Use Value: 125% frequency modulation and integrated EMI filtering reduce conducted emissions below 150kHz limit; 150°C junction rating supports uncooled mounting near fuselage skin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3922EFE#PBF | Same pinout, 40V max output, no spread spectrum, lower 125°C junction rating | Lacks SSFM and AEC-Q100 qualification; suited for non-automotive industrial LED drivers | Select when EMI requirements are less stringent and ambient temperature stays below 125°C |
| MAX20050ATC+T | 3.5A, 65V, I²C-programmable, no internal PWM presets, different 20-pin TQFN package | Requires MCU interface for dimming; supports diagnostic registers but adds firmware overhead | Select when digital configurability and fault logging outweigh need for analog simplicity and pin compatibility |
Compared with LT3922EFE#PBF and MAX20050ATC+T, the LT8386JV#PBF uniquely combines AEC-Q100 Grade 1 qualification, Silent Switcher EMI reduction, and factory-trimmed internal PWM dimming in a drop-in compatible 4mm × 5mm LQFN - making it optimal for automotive and high-reliability embedded lighting where layout reuse and regulatory certification are critical.
Availability
LT8386JV#PBF is available at Aetrix Electronics and suitable for automotive headlamps, HUD systems, machine vision illuminators, and aviation exterior lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8386JV#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 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 and signal chain solutions.
The LT8386JV#PBF belongs to Analog Devices' Silent Switcher LED driver product line, engineered specifically for high-efficiency, low-EMI automotive and industrial lighting applications demanding robust thermal performance and diagnostic capability.
FAQ
What is the maximum LED string voltage supported by the LT8386JV#PBF?
The LT8386JV#PBF supports up to 52V LED string voltage, verified across its full operating junction temperature range (−40°C to +150°C). This enables driving strings of up to 16 white LEDs (3.2V typical forward voltage) while maintaining regulation margin below the device's 60V absolute maximum rating on VOUT and ISP/ISN pins.
Does the LT8386JV#PBF require an external PMOS for PWM dimming?
Yes, the LT8386JV#PBF requires an external high-side PMOS transistor driven by its PWMTG pin. The IC provides gate drive referenced to VOUT (10.5–12.5V swing) and fast turn-on/turn-off propagation (<140ns), but does not integrate the PMOS switch itself - enabling flexible selection of voltage/current-rated MOSFETs for specific thermal or fault-handling needs.
How does the LT8386JV#PBF achieve AEC-Q100 Grade 1 qualification?
The LT8386JV#PBF achieves AEC-Q100 Grade 1 qualification through rigorous stress testing including HTOL (high-temperature operating life), temperature cycling (−40°C to +150°C), and ESD (HBM ≥2kV), all performed on the actual LT8386JV#PBF silicon and 4mm × 5mm LQFN package. Its guaranteed operation from −40°C to +150°C junction temperature meets Grade 1 requirements for under-hood automotive use.
Can the LT8386JV#PBF operate in buck mode?
Yes, the LT8386JV#PBF supports buck, boost, and buck-boost configurations per its datasheet description. In buck mode, it regulates LED current using the same current-sense architecture (ISP/ISN), but requires external configuration of feedback and power path - distinct from its default boost topology. Application circuits for buck operation are documented in Analog Devices' design notes.
What is the purpose of the RP pin on the LT8386JV#PBF?
The RP pin on the LT8386JV#PBF sets the frequency of the internal PWM dimming signal when using preset dimming ratios (1%, 5%, 10%). Connecting a resistor (e.g., 332kΩ) between RP and GND configures the internal oscillator; the PWM pin voltage (0.3V/0.5V/0.7V) then selects the corresponding duty cycle. If external PWM is used, RP must be tied to GND.
LT8386JV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TFQFN Exposed Pad, 26 Leads
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 56V
- Voltage - Output:
- 1.2V ~ 56V
- Current - Output / Channel:
- 3A
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (4x5)
LT8386JV#PBF FAQ
1.How can I place an order for LT8386JV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8386JV#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 LT8386JV#PBF reliable?
The price and inventory of LT8386JV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8386JV#PBF is usually 5 days.
3.What payment methods are accepted for LT8386JV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8386JV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8386JV#PBF?
LT8386JV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8386JV#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 LT8386JV#PBF?
For technical support, including LT8386JV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8386JV#PBF requirements.
6.How does Aetrix verify that LT8386JV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8386JV#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 LT8386JV#PBF meets industry standards.
7.What is the process for return or replacement of LT8386JV#PBF?
All LT8386JV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8386JV#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 LT8386JV#PBF part is unused and in its original packaging.
Return procedure for LT8386JV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8386JV#PBF Tags
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