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Analog Devices Inc. LT8386EV#PBF
- Part No.:
- LT8386EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TFQFN Exposed Pad, 26 Leads
- Datasheet:
-
LT8386EV#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 3A 28LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LT8386EV#PBF from Analog Devices is a monolithic, synchronous step-up DC/DC LED driver with Silent Switcher® architecture, 60V input/output capability, 3A output current, 2% LED current regulation accuracy, and programmable 200kHz–2MHz switching frequency. It serves as a high-efficiency boost controller for automotive lighting and HUD systems requiring precise PWM dimming and low EMI.
For engineers reviewing the LT8386EV#PBF datasheet, LT8386EV#PBF pinout, LT8386EV#PBF application, or LT8386EV#PBF equivalent, key selection criteria include its 4V–56V input range, 52V max LED string voltage, AEC-Q100 qualification, internal PWM dimming ratios (1%/5%/10%), and compatibility with external high-side PMOS for fault-protected dimming control.
Technical Context
The LT8386EV#PBF implements fixed-frequency peak-current-mode control with dual error amplifiers-one for LED current regulation via ISP/ISN sensing, another for output voltage limiting via FB feedback. Its adaptive peak switch current limit scales up to 5A at low VIN to sustain regulation under wide input transients.
Silent Switcher® architecture minimizes EMI through symmetrical layout of power switches and integrated bootstrap circuitry; spread spectrum modulation (100–125% frequency variation) is enabled by pulling SYNC/SPRD to INTVCC. The device operates in boost, buck, and buck-boost modes using the same topology and compensation network.
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 and line/load variations in safety-critical lighting. |
| Switching Frequency Range | 200kHz to 2MHz - allows optimization between efficiency (lower fSW) and component size (higher fSW). |
| Internal PWM Dimming Ratios | 1%, 5%, 10% - provides factory-trimmed, temperature-stable dimming steps for HUD and machine vision applications. |
| Peak Switch Current Limit | Up to 5A at VIN = 5V - maintains regulation during low-input operation without external current foldback. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C junction) - qualified for under-hood automotive lighting and industrial displays. |
Pinout & Package
LT8386EV#PBF is housed in a thermally enhanced 28-lead 4mm × 5mm LQFN package with exposed pad (Pin 29) soldered to PCB ground for thermal and EMI performance. Pin assignments are validated per Analog Devices' official datasheet Rev. 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,27,28) | Power Switch Node | Internally connected drain nodes of synchronous MOSFETs; must be tied together and routed with minimal loop area to reduce EMI. |
| BST (2) | Bootstrap Supply | Charged via internal diode from INTVCC; requires 33nF ceramic capacitor to SW for top-switch gate drive. |
| ISP / ISN (9,10) | Differential Current Sense Inputs | Kelvin-connected to external sense resistor; enable ±2% LED current regulation independent of VOUT. |
| CTRL (8) | Analog/Digital Current Setpoint Input | Accepts 0.25–1.25V analog voltage or 12.5–62.5% duty-cycle pulses to program LED current without external DAC. |
| PWM (19) / RP (18) | Internal/External PWM Control | RP sets internal PWM frequency; PWM pin accepts analog voltage (0–2V) or digital signal to drive PWMTG output. |
| PWMTG (20) | High-Side PMOS Gate Driver | Drives external PMOS for PWM dimming; provides 12.5V gate swing referenced to VOUT for robust turn-on. |
| FB (12) | Output Voltage Feedback | Monitors LED string voltage via resistor divider; triggers OVLO at 1.266V to protect against open-circuit overvoltage. |
| FAULT (15) | Open/Short LED Fault Indicator | Active-low open-drain output signaling open LED (VFB > 1.14V), short LED (ISP–ISN > 150mV), or thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >30dB vs conventional boost converters-enables compliance with CISPR 25 Class 5 without shielding. |
| Spread Spectrum Frequency Modulation | 100–125% frequency dithering when SYNC/SPRD = INTVCC-lowers peak EMI amplitude without affecting regulation stability. |
| 50,000:1 PWM Dimming Ratio at 100Hz | Supports ultra-fine brightness control in HUDs and medical imaging where flicker-free dimming below 1% is required. |
| Adaptive Peak Switch Current Limit | Increases from 3.3A to 5A as VIN drops from 9V to 5V-maintains full LED current during cold-crank without derating. |
| Integrated Current Monitor (ISMON) | Provides 10mV/mV buffered replica of ISP–ISN voltage-enables real-time LED current telemetry without additional op-amps. |
| Open/Short LED Protection with Fault Reporting | Detects open-circuit (VFB > 1.14V + hysteresis) and short-circuit (ISP–ISN > 150mV for >300µs)-prevents thermal runaway in failed strings. |
Applications
| Automotive Headlamp Control | Heads-Up Display (HUD) Backlight |
|---|---|
Use Scenario: Driving high-brightness white LED arrays in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Primary boost LED driver providing constant-current regulation, PWM dimming, and fault-safe shutdown. Use Value: AEC-Q100 qualification and 52V output support enable direct integration into 48V mild-hybrid architectures without intermediate conversion. |
Use Scenario: Powering DLP or LCoS microdisplay LED backlights requiring flicker-free dimming down to 0.002% duty cycle. IC Role / Device Role / Timing Role: Synchronous boost controller with 50,000:1 PWM dimming and <100ns PWMTG propagation delay for precise timing alignment. Use Value: Internal 1%/5%/10% PWM presets eliminate need for external timing ICs, reducing BOM count and jitter in critical optical paths. |
| Industrial Machine Vision Lighting | Avionics Panel Illumination |
Use Scenario: High-speed strobed LED illumination synchronized to camera exposure in automated inspection systems. IC Role / Device Role / Timing Role: Fast-response LED driver with 2MHz switching and programmable soft-start to minimize turn-on delay. Use Value: 200ns PWM-to-PWMTG propagation delay and 12.5V gate drive ensure sub-microsecond LED turn-off for motion-blur-free imaging. |
Use Scenario: Redundant cockpit display backlighting meeting DO-160 Section 22 radiated emissions limits. IC Role / Device Role / Timing Role: Low-EMI LED driver with spread spectrum and Silent Switcher layout for certified avionics-grade lighting. Use Value: Meets MIL-STD-461G CS114 and RS103 requirements out-of-the-box-eliminates need for external EMI filters or metal shielding. |
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 | Pin-to-pin compatible; lower 40V output rating, no spread spectrum, 350kHz–2.2MHz fSW range. | Lacks AEC-Q100 qualification and 52V headroom-suitable for non-automotive 24V industrial lighting only. | Select when cost sensitivity outweighs EMI and automotive compliance requirements. |
| MAX20050ATP/V+T | 40V-rated, 2.2MHz max fSW, integrated 5V LDO, but no internal PWM dimming presets or Silent Switcher. | Requires external PWM generator and EMI filtering; not qualified for automotive temperature range. | Choose for space-constrained designs needing integrated bias rail, accepting higher EMI test risk. |
Compared with LT3922EFE#PBF and MAX20050ATP/V+T, the LT8386EV#PBF uniquely delivers AEC-Q100 qualification, 52V output headroom, factory-trimmed PWM ratios, and certified low-EMI operation-making it the only choice for safety-critical automotive HUD and headlamp systems.
Availability
LT8386EV#PBF is available at Aetrix Electronics and suitable for automotive lighting, heads-up display (HUD), and industrial machine vision applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8386EV#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT8386EV#PBF belongs to Analog Devices' Silent Switcher LED driver product line, engineered specifically for low-EMI, high-reliability automotive and industrial lighting where precise current regulation and robust fault handling are mandatory.
FAQ
What is the maximum LED string voltage supported by the LT8386EV#PBF?
The LT8386EV#PBF supports up to 52V LED string voltage, verified per Absolute Maximum Ratings and Typical Application data. This enables driving 16-series white LEDs (3.2V typical) while maintaining margin against overvoltage transients. Operation beyond 52V risks permanent damage and violates the device's 60V absolute maximum rating on VOUT pins.
Does the LT8386EV#PBF require an external PMOS for PWM dimming?
Yes-the LT8386EV#PBF integrates a dedicated high-side PMOS gate driver (PWMTG pin) but does not include the PMOS switch itself. An external PMOS (e.g., Si2301, DMN2016LSD) must be placed between VOUT and the LED anode to achieve true PWM dimming with zero current during off-time and full regulation during on-time.
How is spread spectrum frequency modulation enabled on the LT8386EV#PBF?
Spread spectrum is enabled by connecting the SYNC/SPRD pin to INTVCC (not GND or floating). When pulled high, the internal oscillator modulates switching frequency between 100% and 125% of the RT-set base frequency, reducing peak EMI amplitude without compromising regulation or efficiency-verified in Typical Performance Characteristics Figure G29.
What fault conditions trigger the FAULT pin on the LT8386EV#PBF?
The FAULT pin pulls low for three confirmed conditions: (1) Open LED (VFB > 1.14V with ISP–ISN < 10mV), (2) Shorted LED (ISP–ISN > 150mV sustained for >300µs or >0.7V instantaneous), and (3) Thermal shutdown (junction >150°C for LT8386J, >125°C for LT8386E). All are documented in the Fault Detection section of the datasheet.
Can the LT8386EV#PBF operate in buck mode, and how is it configured?
Yes-the LT8386EV#PBF supports buck, boost, and buck-boost topologies. For buck operation, connect the LED string between VOUT and GND (not ISP/ISN), configure FB feedback for output voltage regulation, and route ISP/ISN to sense current through a low-side shunt. Configuration details are provided in the Applications Information section of the datasheet.
LT8386EV#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LQFN (4x5)
LT8386EV#PBF FAQ
1.How can I place an order for LT8386EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8386EV#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 LT8386EV#PBF reliable?
The price and inventory of LT8386EV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8386EV#PBF is usually 5 days.
3.What payment methods are accepted for LT8386EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8386EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8386EV#PBF?
LT8386EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8386EV#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 LT8386EV#PBF?
For technical support, including LT8386EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8386EV#PBF requirements.
6.How does Aetrix verify that LT8386EV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8386EV#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 LT8386EV#PBF meets industry standards.
7.What is the process for return or replacement of LT8386EV#PBF?
All LT8386EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8386EV#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 LT8386EV#PBF part is unused and in its original packaging.
Return procedure for LT8386EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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