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Analog Devices Inc. LT8393EUFDM#TRPBF
- Part No.:
- LT8393EUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393EUFDM#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,786
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Product details
Overview
LT8393EUFDM#TRPBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC designed for wide-input, high-output LED driver applications. It regulates constant LED current across input voltages from 4V to 60V and output voltages from 0V to 100V, supports 350kHz–2MHz adjustable switching frequency, achieves ±4% LED current accuracy at 100mV full scale, and integrates open/short LED fault detection with configurable retry/latch-off behavior - used in automotive headlamps and industrial high-voltage lighting systems.
For engineers reviewing the LT8393EUFDM#TRPBF datasheet, LT8393EUFDM#TRPBF pinout, LT8393EUFDM#TRPBF application, or LT8393EUFDM#TRPBF equivalent, key selection considerations include its 4-switch single-inductor architecture enabling seamless VIN-above/VIN-below/VIN-equal-VOUT operation, AEC-Q100 qualification for automotive use, 10V high-side PMOS gate drive capability, 2000:1 external PWM dimming ratio, and side-wettable 28-pin QFN (4mm × 5mm) package with exposed thermal pad.
Technical Context
The LT8393EUFDM#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control, using a single inductor current sense resistor (LSP/LSN) and dual LED current sense inputs (ISP/ISN) to maintain regulation across buck, buck-boost, and boost regions. Its region transitions are defined by precise VIN/VOUT ratios - e.g., buck-to-buck-boost at 1.25 and buck-boost-to-boost at 0.75 - with hysteresis to prevent mode chattering.
It features dual independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), integrated 5V INTVCC LDO, 2V VREF reference, and dedicated PWM dimming circuitry supporting both internal (RP-set) and external (PWM pin) modulation. The SS pin enables soft-start timing and three fault response modes (hiccup, latch-off, keep-running) via resistor configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V automotive and industrial battery inputs without pre-regulation. |
| VOUT Range | 0V to 100V - enables direct drive of multi-string high-voltage LED arrays up to 100V. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature and line/load variations. |
| Switching Frequency | 350kHz to 2MHz - adjustable via RT resistor; supports EMI-sensitive designs and compact magnetics. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for premium lighting control. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
| Package | 28-pin side-wettable QFN (4mm × 5mm) - enables automated optical inspection (AOI) and robust thermal performance via exposed GND pad. |
Pinout & Package
LT8393EUFDM#TRPBF uses a 28-lead plastic side-wettable QFN package (4mm × 5mm) with exposed thermal pad (Pin 29 = GND). Thermal resistance θJA = 43°C/W, θJC = 3.4°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED for ±4% current regulation accuracy independent of trace resistance. |
| LSP / LSN | Inductor current sense differential inputs | Provide single-resistor inductor current feedback for peak-buck/peak-boost mode control and reverse-current protection. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Drive four external power switches in synchronized 4-switch buck-boost topology; TG1/TG2 swing from SWx to BSTx. |
| BST1 / BST2 | Bootstrap floating supplies | Enable high-side N-MOSFET drive; BST1 includes integrated Schottky diode; BST2 requires external diode. |
| VOUT / VIN | Output and input voltage sensing nodes | Determine operating region (buck/buck-boost/boost) and enable seamless transitions without discontinuity. |
| CTRL | Analog dimming input | Sets LED current threshold from 0.25V–1.35V; provides 20:1 analog dimming with ±4% accuracy at full scale. |
| PWM / RP | External/internal PWM dimming interface | PWM pin accepts 0–5V logic; RP resistor sets internal dimming frequency (1024× to 16384× fSW). |
| FAULT | Open-drain fault reporting | Asserts low on open LED (VFB > 0.95V & VISP-ISN < 10mV) or short LED (VFB < 0.25V); supports system-level fault handling. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost stages; reduces BOM count, board area, and EMI vs cascaded solutions. |
| Flicker-free spread spectrum (SSFM) | 25% triangle modulation on SYNC/SPRD pin reduces peak EMI by >10dB without compromising regulation stability. |
| AEC-Q100 Grade E qualification | Validated for automotive headlamp and DRL applications per stress test requirements (–40°C to +125°C). |
| 10V high-side PMOS gate drive (PWMTG) | Directly controls external high-side PMOS switch for PWM dimming without level-shifting circuitry. |
| Configurable fault response | SS pin resistor selection enables hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) behavior during LED faults. |
| Seamless region transition | No current discontinuity or audible noise at VIN/VOUT crossover points (e.g., 0.75, 0.98, 1.02, 1.25) due to overlapping control law. |
Applications
| Automotive Headlamps | Industrial High-Voltage Lighting |
|---|---|
Use Scenario: Adaptive front-lighting systems (AFS) requiring dynamic beam shaping and wide dimming range across 12V–48V vehicle architectures. IC Role / Device Role / Timing Role: Primary LED current controller managing up to 100V string voltage while maintaining ±4% current accuracy during engine cranking transients. Use Value: Enables compliance with UNECE R149 photometric stability requirements via seamless buck-boost transitions and low-noise spread spectrum operation. |
Use Scenario: Factory floor high-bay LED fixtures powered from 48V DC microgrids, requiring 80V+ output for series-connected LED strings. IC Role / Device Role / Timing Role: Constant-current buck-boost controller regulating 300mA at 80V output from 24V–60V input with 93% efficiency at 350kHz. Use Value: Reduces thermal derating and heatsink size through 95% peak efficiency and 3.4°C/W junction-to-case thermal resistance. |
| UV-C Sterilization Systems | Avionics Cabin Lighting |
Use Scenario: Portable UV-C LED modules (275nm) requiring precise current control and overtemperature-safe shutdown in battery-powered enclosures. IC Role / Device Role / Timing Role: LED driver with integrated open/short LED fault detection and thermal foldback, interfacing with MCU via FAULT pin and CTRL analog dimming. Use Value: Prevents LED degradation and system failure via real-time ISP/ISN monitoring and latch-off fault mode during open-circuit conditions. |
Use Scenario: DO-160-compliant cabin lighting with stringent conducted/radiated EMI limits and wide input range (18V–32V DC). IC Role / Device Role / Timing Role: Low-EMI LED controller using SSFM and optimized layout guidance to meet MIL-STD-461 RS103 Class B limits. Use Value: Achieves flicker-free dimming down to 0.05% via 2000:1 external PWM ratio, meeting FAA Advisory Circular 20-173 visual comfort requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | 4-switch buck-boost controller without integrated LED-specific features: no ISP/ISN inputs, no CTRL-based analog dimming, no FAULT reporting, max VOUT = 36V. | General-purpose DC/DC conversion only; not qualified for LED current regulation or automotive lighting. | Select only if designing non-LED power supplies where LED-specific functions are unnecessary. |
| LM3423MH/NOPB | High-side N-MOSFET LED controller with 60V max VOUT, no buck-boost capability, fixed 500kHz frequency, no spread spectrum, no AEC-Q100 rating. | Limited to boost-only LED drivers; unsuitable for VIN > VOUT or automotive under-hood use. | Choose only for cost-sensitive, low-voltage boost LED applications without EMI or automotive qualification requirements. |
Compared with LTC3789EFE#TRPBF and LM3423MH/NOPB, the LT8393EUFDM#TRPBF uniquely combines 100V output capability, AEC-Q100 qualification, integrated LED fault protection, and seamless 4-switch region transitions - making it the only option qualified for high-reliability automotive headlamp and industrial high-voltage LED systems.
Availability
LT8393EUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage lighting, and UV-C sterilization systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8393EUFDM#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 LT8393EUFDM#TRPBF belongs to Analog Devices' Power by Linear™ LED controller product line, engineered specifically for high-efficiency, low-EMI, wide-input-range LED driver applications in demanding automotive and industrial environments.
FAQ
What is the maximum output voltage supported by the LT8393EUFDM#TRPBF?
The LT8393EUFDM#TRPBF supports a maximum output voltage of 100V, as specified in its absolute maximum ratings and validated across all operating regions (buck, buck-boost, and boost). This enables direct driving of high-voltage LED strings without external step-up stages, and is confirmed in the Electrical Characteristics table (VOUT Voltage Range: 0V to 100V).
Does the LT8393EUFDM#TRPBF support analog dimming, and what is its accuracy?
Yes, the LT8393EUFDM#TRPBF supports analog dimming via its CTRL pin, providing a 20:1 dimming range with ±4% LED current accuracy at full scale (100mV sense threshold). This accuracy is guaranteed over the full –40°C to +125°C junction temperature range and is explicitly stated in the Features list and Electrical Characteristics table under "CTRL Dim-Off Threshold" and "Full Scale LED Current Regulation".
How does the LT8393EUFDM#TRPBF handle LED open-circuit and short-circuit faults?
The LT8393EUFDM#TRPBF detects open LED faults when VFB > 0.95V and V(ISP–ISN) < 10mV, and short LED faults when VFB < 0.25V. Upon detection, it asserts the open-drain FAULT pin low and enters a user-configurable response mode (hiccup, latch-off, or keep-running) set by the resistor on the SS pin - details confirmed in the PIN FUNCTIONS section and Typical Application schematic.
What package type and thermal characteristics does the LT8393EUFDM#TRPBF use?
The LT8393EUFDM#TRPBF uses a 28-lead side-wettable QFN package measuring 4mm × 5mm with an exposed thermal pad (Pin 29 = GND). Its thermal performance is characterized as θJA = 43°C/W and θJC = 3.4°C/W, enabling efficient heat dissipation in space-constrained automotive and industrial layouts - data sourced from the ORDER INFORMATION and ABSOLUTE MAXIMUM RATINGS sections.
Is the LT8393EUFDM#TRPBF qualified for automotive applications?
Yes, the LT8393EUFDM#TRPBF is AEC-Q100 qualified for automotive applications. The "E" grade denotes operation from –40°C to +125°C junction temperature, and the device is explicitly listed under "AUTOMOTIVE PRODUCTS" in the ORDER INFORMATION table with #W suffix variants available. Its qualification is further reinforced by inclusion in automotive headlamp application examples and design guidelines.
LT8393EUFDM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LT8393EUFDM#TRPBF FAQ
1.How can I place an order for LT8393EUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393EUFDM#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 LT8393EUFDM#TRPBF reliable?
The price and inventory of LT8393EUFDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393EUFDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393EUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393EUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393EUFDM#TRPBF?
LT8393EUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393EUFDM#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 LT8393EUFDM#TRPBF?
For technical support, including LT8393EUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393EUFDM#TRPBF requirements.
6.How does Aetrix verify that LT8393EUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393EUFDM#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 LT8393EUFDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393EUFDM#TRPBF?
All LT8393EUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393EUFDM#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 LT8393EUFDM#TRPBF part is unused and in its original packaging.
Return procedure for LT8393EUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8393EUFDM#TRPBF Tags
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