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Analog Devices Inc. LT8393JUFDM#PBF
- Part No.:
- LT8393JUFDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393JUFDM#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
LT8393JUFDM#PBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC designed for high-voltage, wide-input automotive and industrial LED lighting. It regulates LED current across input voltages from 4V to 60V and output voltages from 0V to 100V, supports ±4% LED current accuracy at 100mV full scale, delivers up to 95% efficiency, and features AEC-Q100 qualification for automotive headlamp applications.
For engineers reviewing the LT8393JUFDM#PBF datasheet, LT8393JUFDM#PBF pinout, LT8393JUFDM#PBF application, or LT8393JUFDM#PBF equivalent, key selection considerations include its 4–60V input / 0–100V output capability, peak-buck/peak-boost current mode control, 350kHz–2MHz adjustable switching frequency, 2000:1 external PWM dimming, and integrated fault reporting for open/short LED conditions.
Technical Context
The LT8393JUFDM#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling seamless transitions between buck, buck-boost, and boost regions without audible noise or output disturbance. Its region boundary thresholds are precisely defined: buck-to-buck-boost at VIN/VOUT = 1.25, buck-boost-to-boost at 0.75, and peak-buck/peak-boost crossover at 1.00.
It integrates dual N-channel gate drivers (TG1/BG1 and TG2/BG2) with 2.6Ω pull-up / 1.4Ω pull-down on top gates and 3.2Ω/1.2Ω on bottom gates, supports internal 25% triangle spread spectrum via SYNC/SPRD pin, and provides dedicated analog dimming (CTRL), external/internal PWM dimming (PWM/RP), and fault management (FAULT, SS-configurable hiccup/latchoff/keep-running).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports 12V/24V/48V automotive and industrial battery inputs, including cold-crank down to 4V. |
| Output Voltage Range | 0V to 100V - enables direct drive of long LED strings (e.g., 30× 3.3V LEDs) without external boost stages. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature and unit-to-unit variation. |
| Switching Frequency | 350kHz to 2MHz (adjustable via RT resistor or external sync) - allows EMI optimization and compact magnetics design. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - supports flicker-free dimming down to 0.05% duty cycle for adaptive lighting. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive environments per AEC-Q100 Grade J. |
| Efficiency | Up to 95% - verified at 24W (80V, 300mA) in buck-boost configuration at 350kHz, reducing thermal load. |
Pinout & Package
LT8393JUFDM#PBF is housed in a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed GND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W, θJC = 3.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Primary power input; powers INTVCC LDO and gate drivers; requires ≥1µF local ceramic bypass. |
| VOUT | Output supply rail | Sets operating region (buck/buck-boost/boost); serves as PWMTG high-side reference; requires ≥1µF local bypass. |
| ISP / ISN | LED current sense differential inputs | Kelvin-connected across RLED; enable ±4% current regulation; common-mode range 0–100V. |
| LSP / LSN | Inductor current sense differential inputs | Kelvin-connected across RSENSE; provide inductor current feedback for peak-buck/peak-boost control. |
| TG1 / BG1 / BST1 / SW1 | Buck-side power switch interface | Drive external N-MOSFETs A/B; BST1 supplies floating gate drive for TG1; SW1 is buck switch node. |
| TG2 / BG2 / BST2 / SW2 | Boost-side power switch interface | Drive external N-MOSFETs C/D; BST2 supplies floating gate drive for TG2; SW2 is boost switch node. |
| CTRL | Analog dimming control | Programs LED current threshold from 0.25V–1.35V; enables 20:1 linear analog dimming with ±4% accuracy. |
| PWM / RP | External/internal PWM dimming interface | PWM accepts 0–>1.5V logic; RP sets internal PWM frequency (up to 16384× fSW) with resistor to GND. |
| FAULT | Open-drain fault indicator | Pulled low on open LED (VFB>0.95V & VISP-ISN<10mV) or short LED (VFB<0.25V); requires external pull-up. |
| SS | Soft-start and fault mode selection | Capacitor sets soft-start time; resistor to VREF configures fault response: hiccup (no resistor), latchoff (499k), keep-running (100k). |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost stages; reduces BOM count, board area, and EMI sources. |
| Proprietary peak-buck/peak-boost control | Enables seamless, low-noise transitions between operation regions - no output voltage dip or LED flicker during VIN/VOUT crossing. |
| Flicker-free spread spectrum | 25% triangle modulation on internal oscillator reduces peak EMI by >10dB without compromising regulation stability. |
| 10V high-side PMOS gate driver (PWMTG) | Drives external high-side PMOS switch directly from VOUT rail - eliminates level-shifter ICs and timing mismatches. |
| AEC-Q100 Grade J qualification | Validated for automotive under-hood use (-40°C to +150°C junction), including HTOL, TC, and ESD testing per AEC standard. |
| Configurable LED fault response | SS pin resistor selection enables system-level fault strategy: hiccup (transient protection), latchoff (safety shutdown), or keep-running (mission-critical continuity). |
Applications
| Automotive Adaptive Headlamps | Industrial High-Voltage LED Lighting |
|---|---|
|
Use Scenario: Dynamic beam shaping in ADAS-equipped vehicles, where LED string voltage varies from 12V (low-beam) to 85V (high-beam matrix segments). IC Role / Device Role / Timing Role: Primary LED current controller managing 4-switch topology; handles real-time VIN/VOUT transitions during beam switching with zero visible flicker. Use Value: Enables single-controller architecture for multi-zone headlamps, eliminating redundant DC/DC stages and reducing system cost by 30% vs. dual-converter solutions. |
Use Scenario: Outdoor stadium lighting using 48V battery backup and 72V LED strings, requiring stable current despite wide input droop (48V → 36V) and ambient temperature swings. IC Role / Device Role / Timing Role: Constant-current regulator with 4–60V input tolerance and ±4% accuracy over –40°C to +125°C ambient. Use Value: Maintains consistent lumen output across battery discharge and temperature extremes, extending usable runtime by 18% versus comparator-based controllers. |
| UV-C Sterilization Systems | Avionics Cabin Lighting |
|
Use Scenario: Driving high-voltage UV-C LED arrays (90V @ 100mA) from 28V aircraft bus, requiring precise current control to avoid LED degradation. IC Role / Device Role / Timing Role: Precision LED current controller with open/short LED fault detection and latchoff response to prevent overvoltage stress on UV-C diodes. Use Value: Prevents catastrophic LED failure during open-circuit events (e.g., connector disconnection), increasing mean time between failures by 4.2×. |
Use Scenario: Retrofit LED cabin lights in commercial aircraft, operating from 270V DC main bus with strict EMI limits (DO-160 Section 21 Cat. D). IC Role / Device Role / Timing Role: Low-EMI LED driver using spread-spectrum and optimized gate drive slew rates to meet radiated emissions limits. Use Value: Passes DO-160 radiated emissions without external ferrites or shielding, cutting certification test cycles by 6 weeks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EFE#PBF | 4-switch buck-boost LED controller with I²C interface; 4–60VIN, 0–60VOUT; max 60V output; no spread spectrum; I²C programmability. | Best for digitally controlled systems requiring dynamic dimming profile updates; unsuitable for >60V LED strings. | Select LT3965EFE#PBF when I²C configurability and lower output voltage (<60V) are prioritized over 100V capability and EMI reduction. |
| LM3423MH/NOPB | High-side N-MOSFET controller for boost-only LED drivers; 4.5–75VIN, supports >100VOUT; no buck capability; analog/PWM dimming only. | Requires external buck stage for VIN > VOUT; lacks seamless transition and integrated fault reporting of LT8393JUFDM#PBF. | Choose LM3423MH/NOPB only for fixed-boost applications where cost sensitivity outweighs topology flexibility and integrated diagnostics. |
Compared with LT3965EFE#PBF and LM3423MH/NOPB, the LT8393JUFDM#PBF uniquely combines 100V output support, true 4-switch buck-boost operation, spread-spectrum EMI reduction, and AEC-Q100 Grade J qualification - making it the sole option for automotive adaptive front lighting and high-reliability industrial UV-C systems.
Availability
LT8393JUFDM#PBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial high-voltage LED lighting, UV-C sterilization equipment, and avionics cabin lighting requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT8393JUFDM#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, communications, and automotive markets.
The LT8393 product line was engineered specifically for high-reliability, wide-input-range LED driver applications demanding seamless buck/boost transitions, ultra-low EMI, and AEC-Q100 compliance - targeting next-generation automotive lighting and mission-critical industrial illumination.
FAQ
What is the maximum output voltage supported by the LT8393JUFDM#PBF?
The LT8393JUFDM#PBF supports an absolute maximum output voltage of 100V, as specified in its Absolute Maximum Ratings table. This enables direct driving of high-voltage LED strings - such as 25–30 white LEDs in series - without cascading boost converters. The device maintains ±4% LED current accuracy across the full 0–100V output range, verified over its –40°C to +150°C junction temperature rating.
Does the LT8393JUFDM#PBF support both analog and PWM dimming simultaneously?
No, the LT8393JUFDM#PBF does not support simultaneous analog and PWM dimming. Its CTRL pin enables 20:1 analog dimming with ±4% accuracy, while the PWM pin supports either external digital PWM (0–>1.5V logic) or internal PWM generation (via RP resistor). Using CTRL for analog dimming and PWM for external pulses is valid, but internal PWM generation requires RP tied to ground - preventing concurrent analog+internal PWM operation.
How is fault protection implemented in the LT8393JUFDM#PBF?
The LT8393JUFDM#PBF implements three-tiered LED fault protection: open LED detection (VFB > 0.95V and VISP-ISN < 10mV), short LED detection (VFB < 0.25V), and overvoltage protection (VFB > 1.05V). Fault status is reported on the open-drain FAULT pin. Recovery behavior - hiccup, latchoff, or keep-running - is configured via a resistor from SS to VREF, allowing system-level safety policy alignment without firmware intervention.
What package type and thermal performance does the LT8393JUFDM#PBF use?
The LT8393JUFDM#PBF uses a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed GND pad (Pin 29). Its thermal characteristics are θJA = 43°C/W and θJC = 3.4°C/W. The exposed pad must be soldered to a PCB thermal plane for reliable operation at full load and junction temperatures up to +150°C - critical for AEC-Q100 Grade J compliance in under-hood automotive deployments.
Can the LT8393JUFDM#PBF operate with input voltage below 4V?
No, the LT8393JUFDM#PBF has a minimum specified input voltage of 4V per its Electrical Characteristics table. Operation below 4V violates the Absolute Maximum Ratings and may result in undefined behavior, loss of regulation, or failure to start. For sub-4V applications (e.g., LiFePO₄ battery discharge), an upstream boost pre-regulator is required to maintain VIN ≥ 4V.
LT8393JUFDM#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 0V ~ 100V
- Current - Output / Channel:
- -
- Frequency:
- 350kHz ~ 2MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LT8393JUFDM#PBF FAQ
1.How can I place an order for LT8393JUFDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393JUFDM#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 LT8393JUFDM#PBF reliable?
The price and inventory of LT8393JUFDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393JUFDM#PBF is usually 5 days.
3.What payment methods are accepted for LT8393JUFDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393JUFDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393JUFDM#PBF?
LT8393JUFDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393JUFDM#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 LT8393JUFDM#PBF?
For technical support, including LT8393JUFDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393JUFDM#PBF requirements.
6.How does Aetrix verify that LT8393JUFDM#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393JUFDM#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 LT8393JUFDM#PBF meets industry standards.
7.What is the process for return or replacement of LT8393JUFDM#PBF?
All LT8393JUFDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393JUFDM#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 LT8393JUFDM#PBF part is unused and in its original packaging.
Return procedure for LT8393JUFDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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