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Analog Devices Inc. LT8393HUFDM#TRPBF
- Part No.:
- LT8393HUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393HUFDM#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,556
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Product details
Overview
LT8393HUFDM#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 constant 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 LT8393HUFDM#TRPBF datasheet, LT8393HUFDM#TRPBF pinout, LT8393HUFDM#TRPBF application, or LT8393HUFDM#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating regions (buck/buck-boost/boost), real-world dimming performance (2000:1 external PWM), and fault protection behavior under open/short LED conditions.
Technical Context
The LT8393HUFDM#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, buck-boost, and boost operation based on VIN/VOUT ratio - with defined thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75, peak-buck to peak-boost at 0.98–1.00) and hysteresis to prevent mode chattering.
It integrates two independent gate driver stages (TG1/BG1 for buck side; TG2/BG2 for boost side), 5V INTVCC LDO, 2V VREF reference, and dedicated analog (CTRL) and digital (PWM/RP) dimming interfaces. Fault detection includes open LED (VFB > 0.95V & V(ISP−ISN) < 10mV), short LED (VFB < 0.25V), and overvoltage (VFB > 1.05V), with configurable FAULT response via SS pin resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V battery systems and cold-crank transients up to 60V without external protection. |
| VOUT Range | 0V to 100V - enables direct drive of multi-string high-voltage LED arrays (e.g., 30–90V automotive headlamps) without intermediate converters. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature and unit-to-unit variation in production lighting modules. |
| Dimming Ratio | 2000:1 external PWM / 128:1 internal PWM - meets stringent flicker-free requirements for adaptive driving beam (ADB) and DLP projection systems. |
| Switching Frequency | 350kHz to 2MHz (adjustable via RT) - allows EMI optimization and compact magnetics design while maintaining >93% efficiency at 350kHz (80V/300mA). |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H, enabling placement near hot engine compartments or under-hood LED drivers. |
| Fault Protection | Open/short LED detection with programmable response (hiccup/latch-off/keep-running) - eliminates need for external monitoring circuitry in safety-critical lighting. |
Pinout & Package
LT8393HUFDM#TRPBF uses a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed thermal pad (Pin 29 = GND). The package supports high-power dissipation (θJC = 3.4°C/W) and automated optical inspection (AOI) via side-wettable leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED for ±4% current regulation accuracy; rejects PCB trace resistance and noise. |
| LSP / LSN | Inductor current sense differential inputs | Enables single-inductor 4-switch topology; provides reverse-current detection and seamless region transition control. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Independent buck-side (TG1/BG1) and boost-side (TG2/BG2) drivers with integrated bootstrap diodes (BST1/BST2) and dead-time control. |
| PWMTG | High-side PMOS PWM switch driver | Inverted buffered PWM output referenced to VOUT; drives external high-side PMOS for true high-side dimming with 10V swing capability. |
| CTRL | Analog dimming control input | Linearly sets LED current threshold from 0–100mV (0.25V–1.35V input); enables 20:1 analog dimming with ±4% accuracy at full scale. |
| FAULT | Open-drain fault reporting output | Pulled low during open/short LED faults; updated only during PWM high state and latched during low state for reliable system-level fault capture. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary peak-buck/peak-boost control | Enables smooth, low-noise transitions between buck, buck-boost, and boost modes without audible artifacts or output voltage glitches. |
| Flicker-free spread spectrum (SSFM) | 25% triangle modulation reduces peak EMI by >10dB at fundamental switching frequency - critical for automotive EMC compliance (CISPR 25 Class 5). |
| 10V high-side PMOS gate drive (PWMTG) | Directly drives external high-side PMOS switches without level-shifting circuitry, simplifying layout and improving dimming timing fidelity. |
| Configurable fault response via SS pin | Single resistor (499k = latch-off, 100k = keep-running, no resistor = hiccup) replaces complex fault-handling logic in MCU-based systems. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data - meets functional safety requirements for ASIL-B automotive lighting. |
Applications
| Automotive Adaptive Headlamps | Industrial High-Voltage LED Lighting |
|---|---|
Use Scenario: Dynamic beam shaping in ADB systems requiring precise, flicker-free dimming of multiple high-voltage LED segments. IC Role / Device Role / Timing Role: Primary LED current controller managing up to 100V output with synchronized 2MHz switching and 2000:1 PWM dimming. Use Value: Eliminates need for multiple DC/DC stages; achieves <1µs PWM propagation delay to PWMTG for sub-millisecond beam updates. |
Use Scenario: Outdoor area lighting (e.g., streetlights, tunnel lights) powered from 48V DC microgrids with variable string configurations. IC Role / Device Role / Timing Role: Wide-input buck-boost LED driver supporting 4V–60V input and 0V–100V output to accommodate aging batteries and long LED strings. Use Value: Maintains >93% efficiency across all operating regions, reducing thermal load and enabling passive cooling in IP66 enclosures. |
| Avionics Cabin Lighting | Medical Surgical Lighting |
Use Scenario: DALI-compatible cabin lighting with strict EMI limits and wide dimming range for passenger comfort and crew visibility. IC Role / Device Role / Timing Role: Low-EMI LED controller with spread-spectrum operation and analog dimming interface for smooth 0–100% light ramping. Use Value: Meets DO-160 Section 20 Level A conducted/radiated emissions without added filtering; ±4% current accuracy ensures color consistency. |
Use Scenario: Shadowless surgical lamps requiring ultra-stable, ripple-free illumination with instant-on capability and fail-safe fault reporting. IC Role / Device Role / Timing Role: Safety-critical LED driver with open/short LED detection, latch-off fault mode, and AEC-Q100 reliability validation. Use Value: FAULT pin provides immediate hardware-level alert to lamp controller MCU, enabling automatic backup activation within 10ms. |
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 I²C interface; 60V max VIN, 80V max VOUT; no spread spectrum; lower dimming resolution (1000:1 PWM). | Best suited for digitally controlled lighting where I²C telemetry and diagnostics are required; lacks AEC-Q100 qualification. | Select when system-level digital control and fault logging outweigh need for automotive qualification and ultra-low EMI. |
| LM34927QMH/NOPB | 2-switch buck-boost LED controller; 6.5V–75V VIN; 0V–60V VOUT; fixed 500kHz fSW; no analog dimming; requires external PWM generator. | Targeted at cost-sensitive industrial lighting; lacks seamless region transition and high-side PMOS drive (PWMTG). | Select for non-automotive applications where VOUT ≤ 60V and simplified BOM justifies loss of analog dimming and advanced fault handling. |
Compared with LT3965EFE#TRPBF and LM34927QMH/NOPB, the LT8393HUFDM#TRPBF uniquely combines AEC-Q100 Grade H qualification, 100V output capability, flicker-free spread spectrum, and integrated high-side PMOS drive - making it the only option for high-reliability, high-voltage, low-EMI automotive headlamp designs.
Availability
LT8393HUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, avionics cabin systems, and medical surgical lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8393HUFDM#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 automotive, industrial, communications, and healthcare 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 automotive-grade robustness - targeting next-generation adaptive lighting and safety-critical illumination systems.
FAQ
What is the maximum output voltage supported by the LT8393HUFDM#TRPBF?
The LT8393HUFDM#TRPBF supports a maximum output voltage of 100V, as specified in its absolute maximum ratings and electrical characteristics. This enables direct drive of high-voltage LED strings common in automotive headlamps and industrial area lighting. Operation up to 100V is guaranteed across the full –40°C to +150°C junction temperature range for the H-grade variant.
Does the LT8393HUFDM#TRPBF support analog dimming, and what is its accuracy?
Yes, the LT8393HUFDM#TRPBF supports analog dimming via its CTRL pin, providing 20:1 dimming range with ±4% LED current accuracy at full scale (100mV sense threshold). The CTRL pin accepts an external voltage (0.25V–1.35V) to linearly set the current sense threshold, enabling smooth, flicker-free brightness control without PWM artifacts.
How does the LT8393HUFDM#TRPBF handle LED open-circuit and short-circuit faults?
The LT8393HUFDM#TRPBF detects open LED conditions (VFB > 0.95V & V(ISP−ISN) < 10mV) and short LED conditions (VFB < 0.25V) and asserts the open-drain FAULT pin low. Its response-hiccup, latch-off, or keep-running-is configured via a resistor on the SS pin. This hardware-level fault handling eliminates reliance on external monitoring circuits or firmware intervention.
What package type and thermal performance does the LT8393HUFDM#TRPBF use?
The LT8393HUFDM#TRPBF uses a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed thermal pad (Pin 29 = GND). It achieves θJC = 3.4°C/W and θJA = 43°C/W, enabling efficient heat transfer to the PCB ground plane. This package supports automated optical inspection and is qualified for reflow soldering per J-STD-020 moisture sensitivity level 3.
Is the LT8393HUFDM#TRPBF AEC-Q100 qualified, and for which grade?
Yes, the LT8393HUFDM#TRPBF is AEC-Q100 qualified for Grade H, covering an operating junction temperature range of –40°C to +150°C. This qualification includes stress testing for temperature cycling, humidity bias, and high-temperature operating life - confirming suitability for under-hood automotive LED driver applications.
LT8393HUFDM#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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LT8393HUFDM#TRPBF FAQ
1.How can I place an order for LT8393HUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393HUFDM#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 LT8393HUFDM#TRPBF reliable?
The price and inventory of LT8393HUFDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393HUFDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393HUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393HUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393HUFDM#TRPBF?
LT8393HUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393HUFDM#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 LT8393HUFDM#TRPBF?
For technical support, including LT8393HUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393HUFDM#TRPBF requirements.
6.How does Aetrix verify that LT8393HUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393HUFDM#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 LT8393HUFDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393HUFDM#TRPBF?
All LT8393HUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393HUFDM#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 LT8393HUFDM#TRPBF part is unused and in its original packaging.
Return procedure for LT8393HUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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