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Analog Devices Inc. LT8393JFE#TRPBF
- Part No.:
- LT8393JFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393JFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,665
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Product details
Overview
LT8393JFE#TRPBF 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, enables 2000:1 external PWM dimming, and features AEC-Q100 qualification for automotive headlamp applications.
For engineers reviewing the LT8393JFE#TRPBF datasheet, LT8393JFE#TRPBF pinout, LT8393JFE#TRPBF application, or LT8393JFE#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed operating regions (buck/buck-boost/boost), real-world efficiency data (up to 95%), and precise fault protection behavior - all aligned with Rev. B datasheet specifications.
Technical Context
The LT8393JFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor and dual current sense paths (ISP/ISN for LED, LSP/LSN for inductor). It dynamically transitions between buck (VIN/VOUT ≤ 0.75), buck-boost (0.75 < VIN/VOUT < 1.33), and boost (VIN/VOUT ≥ 1.33) regions with seamless low-noise mode switching and built-in hysteresis to prevent chattering.
It integrates dual 5V-integrated gate drivers (TG1/BG1 and TG2/BG2), a 2V reference (VREF), 1.00V FB regulation, soft-start (SS) with programmable fault response (hiccup/latchoff/keep-running), and spread-spectrum operation via SYNC/SPRD pin. The J-grade variant operates from –40°C to +150°C junction temperature with guaranteed performance over full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V automotive and industrial rails, including cold-crank down to 4V. |
| VOUT Range | 0V to 100V - enables direct drive of multi-string high-voltage LED arrays without external boost stages. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature and unit-to-unit variation. |
| Dimming Ratio | 2000:1 external PWM, 128:1 internal PWM - meets stringent flicker-free requirements for adaptive driving beams. |
| Switching Frequency | 350kHz to 2MHz (adjustable via RT resistor or external sync) - allows EMI optimization and compact magnetics design. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1, enabling under-hood deployment without derating. |
| Efficiency | Up to 95% - verified at 24W (80V, 300mA) in buck-boost mode at 350kHz, minimizing thermal load in sealed enclosures. |
Pinout & Package
LT8393JFE#TRPBF is packaged in a 28-lead plastic TSSOP (FE package) with exposed GND pad (Pin 29), θJA = 30°C/W. Pin functions are validated per Rev. B datasheet and confirmed for J-grade operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED; enable ±4% current regulation and open/short LED fault detection. |
| LSP / LSN | Inductor current sense differential inputs | Provide inductor current feedback for peak-buck/peak-boost mode control and reverse-current protection. |
| TG1 / BG1 / BST1 / SW1 | Buck-side power switch interface | Drive external N-MOSFETs A/B in buck region; BST1 requires external bootstrap capacitor to SW1. |
| TG2 / BG2 / BST2 / SW2 | Boost-side power switch interface | Drive external N-MOSFETs C/D in boost region; BST2 requires Schottky diode + bootstrap capacitor to SW2. |
| VOUT | Output voltage sensing and PWMTG rail | Sets operating region (buck/buck-boost/boost); supplies VOUT–10V to 100V swing for external PMOS PWM switch drive. |
| CTRL | Analog dimming control input | Programs LED current threshold from 0–100mV linearly (0.25V–1.35V input); 20:1 analog dimming range. |
| FAULT | Open-drain fault reporting output | Pulled low on open LED (VFB > 0.95V & VISP-ISN < 10mV) or short LED (VFB < 0.25V); latched during PWM low state. |
| EN/UVLO | Enable and input UVLO input | Shuts down device below 0.3V; enables at 1.220V falling threshold; 2.5µA pull-down enables precise resistor-divider UVLO setting. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary peak-buck/peak-boost control | Enables single-inductor operation across VIN < VOUT, VIN ≈ VOUT, and VIN > VOUT - eliminates need for separate buck/boost controllers. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD pin reduces peak EMI by >10dB without compromising dimming fidelity. |
| 10V high-side PMOS gate driver (PWMTG) | Drives external high-side PMOS with rail-to-rail swing up to VOUT, enabling true high-side PWM dimming without level shifters. |
| Three-mode fault response | Configurable via SS-to-VREF resistor: hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) - matches system-level safety requirements. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +150°C junction, including HTOL, TC, and ESD testing - supports ASIL-B system integration. |
Applications
| Automotive Head Lamps | Industrial High-Voltage LED Lighting |
|---|---|
Use Scenario: Adaptive front-lighting systems (AFS) requiring dynamic beam shaping, matrix dimming, and cold-crank operation down to 4V. IC Role / Device Role / Timing Role: Primary LED current controller managing up to 100V string voltage with seamless buck-boost transitions during rapid VIN transients. Use Value: Eliminates separate buck + boost stages; ±4% current accuracy ensures consistent photometric output across ambient temperature swings. |
Use Scenario: High-bay warehouse lighting with 48–72V DC microgrids powering 40–80V LED strings. IC Role / Device Role / Timing Role: Constant-current regulator supporting wide input (4–60V) and output (0–100V) ranges while maintaining 95% peak efficiency. Use Value: Enables single-controller scalability across multiple fixture SKUs; 2000:1 PWM dimming meets DALI-2 and Zhaga-compliant control standards. |
| Off-Highway Vehicle Lighting | Battery-Powered Emergency Lighting |
Use Scenario: Construction and agricultural equipment with 24V nominal battery systems subject to load-dump (60V+) and cranking dips (4V). IC Role / Device Role / Timing Role: Robust LED driver sustaining regulation across extreme input transients while providing open/short LED fault reporting. Use Value: AEC-Q100 qualification ensures reliability in harsh vibration/temperature environments; latch-off fault mode prevents thermal runaway. |
Use Scenario: Portable safety lights powered by Li-ion packs (10–28V) driving high-lumen LED arrays requiring >80V compliance. IC Role / Device Role / Timing Role: Wide-input buck-boost controller enabling direct battery-to-LED conversion without intermediate DC/DC stages. Use Value: Reduces bill-of-materials count and PCB area; 2µA shutdown quiescent current extends runtime in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EFE#TRPBF | 4-switch buck-boost LED controller with integrated MOSFETs (60V max VOUT), fixed 2MHz frequency, no spread spectrum. | Lower component count but limited to ≤60V output; lacks programmable fault modes and 100V capability. | Select when board space is critical and VOUT ≤60V; avoid for 80–100V automotive headlamps. |
| LM3423MH/NOPB | High-side N-channel controller with external FETs; 60V max VOUT; no buck-boost topology - requires separate boost stage for VIN < VOUT. | Requires additional inductor and controller for boost operation; no seamless transition between modes. | Select only for fixed-buck or fixed-boost designs where VIN always > VOUT or VIN always < VOUT. |
Compared with LT3965EFE#TRPBF and LM3423MH/NOPB, the LT8393JFE#TRPBF uniquely supports 100V output, AEC-Q100 Grade 1 operation, programmable spread spectrum, and three configurable fault responses - making it the only option for high-reliability, high-voltage, automotive-grade adaptive lighting.
Availability
LT8393JFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, off-highway vehicle lighting, and battery-powered emergency lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8393JFE#TRPBF 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 industrial, automotive, communications, and healthcare markets.
The LT8393 product line was engineered specifically for high-reliability, wide-input-range LED driver applications demanding seamless buck-boost operation, ultra-low EMI, and AEC-Q100 compliance - targeting next-generation adaptive automotive lighting and robust industrial illumination.
FAQ
What is the maximum output voltage supported by the LT8393JFE#TRPBF?
The LT8393JFE#TRPBF supports a VOUT range of 0V to 100V, as specified in the Absolute Maximum Ratings table (VOUT, ISP, ISN = 100V). This enables direct drive of high-voltage LED strings without cascaded boost converters, and is validated across the full –40°C to +150°C junction temperature range for the J-grade variant.
Does the LT8393JFE#TRPBF support spread-spectrum operation, and how is it enabled?
Yes, the LT8393JFE#TRPBF supports flicker-free triangle spread spectrum. It is enabled by tying the SYNC/SPRD pin to INTVCC, which activates internal 25% frequency modulation above the base oscillator frequency set by the RT resistor. This reduces peak EMI without affecting PWM dimming performance or current regulation accuracy.
How does the LT8393JFE#TRPBF handle LED open and short circuit faults?
The LT8393JFE#TRPBF detects open LED conditions when VFB > 0.95V and V(ISP–ISN) < 10mV, and short LED conditions when VFB < 0.25V. Upon detection, it pulls the FAULT pin low and enters one of three user-configurable responses - hiccup, latch-off (via 499kΩ SS-to-VREF), or keep-running (via 100kΩ SS-to-VREF) - all confirmed in the Rev. B datasheet.
What is the purpose of the PWMTG pin on the LT8393JFE#TRPBF, and what voltage swing does it provide?
The PWMTG pin on the LT8393JFE#TRPBF is a buffered, inverted PWM output that drives an external high-side PMOS switch. Its voltage swing ranges from (VOUT –10V) to VOUT, enabling true high-side PWM dimming without level-shifting circuitry. This is explicitly defined in the PIN FUNCTIONS section and validated for operation up to 100V VOUT.
Is the LT8393JFE#TRPBF AEC-Q100 qualified, and what grade does it meet?
Yes, the LT8393JFE#TRPBF is AEC-Q100 qualified per Grade 1 requirements (–40°C to +150°C junction temperature), as stated in the FEATURES and ORDER INFORMATION sections. The "J" suffix denotes the automotive-grade temperature rating, and the datasheet confirms guaranteed performance over the full range with HTOL, TC, and ESD validation.
LT8393JFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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
- Supplier Device Package:
- 28-TSSOP-EP
LT8393JFE#TRPBF FAQ
1.How can I place an order for LT8393JFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393JFE#TRPBF 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 LT8393JFE#TRPBF reliable?
The price and inventory of LT8393JFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393JFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393JFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393JFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393JFE#TRPBF?
LT8393JFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393JFE#TRPBF 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 LT8393JFE#TRPBF?
For technical support, including LT8393JFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393JFE#TRPBF requirements.
6.How does Aetrix verify that LT8393JFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393JFE#TRPBF 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 LT8393JFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393JFE#TRPBF?
All LT8393JFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393JFE#TRPBF, 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 LT8393JFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8393JFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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