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Analog Devices Inc. LT8393EUFDM#PBF
- Part No.:
- LT8393EUFDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393EUFDM#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
LT8393EUFDM#PBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC that regulates constant LED current across input voltages (4V–60V) above, below, or equal to output voltage (0V–100V), featuring proprietary peak-buck/peak-boost current mode control, ±4% LED current accuracy at 100mV full scale, and AEC-Q100 qualification for automotive headlamp systems.
For engineers reviewing the LT8393EUFDM#PBF datasheet, LT8393EUFDM#PBF pinout, LT8393EUFDM#PBF application, or LT8393EUFDM#PBF equivalent, key selection considerations include its 350kHz–2MHz adjustable switching frequency, 2000:1 external PWM dimming ratio, 10V high-side PMOS gate drive capability on PWMTG, seamless region transitions, and fault reporting via open/short LED detection with configurable latch-off or hiccup modes.
Technical Context
The LT8393EUFDM#PBF implements a dual-mode current-sense architecture using a single inductor current sense resistor (LSP/LSN) and separate LED current sense inputs (ISP/ISN), enabling precise regulation across buck, buck-boost, and boost regions without topology reconfiguration. Its peak-buck/peak-boost control logic dynamically selects operation based on real-time VIN/VOUT ratio thresholds (e.g., buck-boost to boost at VIN/VOUT = 0.75).
It integrates two independent N-channel gate drivers (TG1/BG1 and TG2/BG2) with BST1/BST2 bootstrap supplies, a dedicated 10V high-side PMOS driver (PWMTG), internal 5V LDO (INTVCC), 2V reference (VREF), and analog dimming interface (CTRL) supporting 20:1 linear control with ±4% accuracy - all coordinated through a unified error amplifier (VC) and dual comparators for LED current and FB loop regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide automotive battery transients and industrial DC inputs without pre-regulation. |
| VOUT Range | 0V to 100V - enables direct driving of multi-string high-voltage LED arrays without external boost stages. |
| Switching Frequency | 350kHz to 2MHz - adjustable via RT resistor or synchronizable externally; enables EMI optimization and compact magnetics. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature and unit-to-unit variation in production lighting systems. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for adaptive lighting and HUD applications. |
| Operating Temp | –40°C to +125°C junction - validated for under-hood automotive environments and industrial outdoor enclosures. |
| Fault Protection | Open/short LED detection with FAULT pin assertion and user-selectable hiccup/latch-off/keep-running response - eliminates need for external monitoring circuitry. |
Pinout & Package
LT8393EUFDM#PBF uses 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 |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED for ±4% accuracy; supports 0–100V common-mode range and open-LED detection down to 7mV threshold. |
| LSP / LSN | Inductor current sense differential inputs | Provides inductor current feedback for peak-buck/peak-boost mode control and reverse-current protection across all operating regions. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Drive four external power switches; TG1/BG1 control buck-side switches, TG2/BG2 control boost-side switches with integrated bootstrap diodes on BST1. |
| PWMTG | High-side PMOS PWM switch driver | Provides inverted, buffered PWM signal with rail-to-rail swing (VOUT–10V to VOUT) for external high-side dimming FETs. |
| CTRL | Analog dimming control input | Accepts 0.25V–1.35V analog voltage to set LED current threshold linearly; 20:1 dimming range with ±4% accuracy at full scale. |
| FAULT | Open-drain fault status output | Pulled low during open LED (VFB>0.95V & VISP-ISN<10mV) or short LED (VFB<0.25V); requires external pull-up for system-level fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count, board area, and EMI sources in space-constrained headlamp modules. |
| Flicker-free spread spectrum modulation | 25% triangle dither on internal oscillator reduces peak EMI by >10dB without compromising dimming performance or efficiency. |
| Seamless region transition | No audible noise or light flicker during VIN/VOUT crossover (e.g., engine cranking or battery sag), with hysteresis-controlled mode boundaries (e.g., buck-boost to buck at VIN/VOUT = 1.33). |
| AEC-Q100 Grade E qualification | Validated for automotive use at –40°C to +125°C junction temperature with HTOL, TC, and ESD testing per stress test plan. |
| Configurable fault response | SS pin resistor selection (499k = latch-off, 100k = keep-running, no resistor = hiccup) enables tailored safety behavior per OEM functional safety requirements. |
Applications
| Automotive Head Lamps | High-Voltage LED Signage |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED arrays requiring dynamic beam shaping and local dimming under 12V/24V battery supply with cold-cranking down to 4V. IC Role / Device Role / Timing Role: Primary LED current controller managing up to 100V string voltage while maintaining ±4% current accuracy across temperature and input transients. Use Value: Enables pixel-level dimming without external current DACs or op-amps; 2000:1 PWM ratio supports <1% brightness steps for glare-free highway illumination. | Use Scenario: Outdoor architectural LED signage powered from 48V DC distribution bus, driving 72V LED strings with thermal derating and long cable runs. IC Role / Device Role / Timing Role: Constant-current buck-boost regulator interfacing between fixed 48V supply and variable 0–100V LED load, handling input/output overlap during dimming transitions. Use Value: Single-chip solution replaces discrete buck+boost cascades; 93% efficiency at 80V/300mA reduces heatsink size and improves system MTBF. |
| Battery-Powered Emergency Lighting | Industrial Machine Vision Illumination |
Use Scenario: Portable emergency egress lighting using Li-ion battery pack (8–28V) driving high-lumen white LED strings requiring stable current during discharge. IC Role / Device Role / Timing Role: Wide-input LED driver maintaining regulated current as battery voltage drops from 28V to 8V, with seamless buck-to-buck-boost transition at ~16V. Use Value: Extends runtime by 18% vs. fixed-buck designs; internal 5V LDO powers microcontroller and sensors without auxiliary regulator. | Use Scenario: High-speed machine vision camera strobes requiring µs-level PWM timing precision and zero current ripple during exposure windows. IC Role / Device Role / Timing Role: Synchronized LED driver accepting external 1MHz clock on SYNC/SPRD pin to align LED pulses with image capture timing. Use Value: 50ns PWM-to-PWMTG propagation delay and 70ns rise time ensure sub-microsecond dimming edge fidelity for 10k fps imaging. |
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, 12-bit dimming resolution, but narrower 6V–60V VIN and 0V–60V VOUT ranges. | Requires MCU host for configuration; lacks analog CTRL dimming and spread spectrum EMI reduction. | Select when digital control, diagnostics, and multi-channel synchronization are required over analog simplicity and EMI robustness. |
| MAX20051ATP/V+ | Automotive-grade 4-switch buck-boost LED controller with integrated MOSFETs (42V max VOUT), 2.2MHz max fSW, but no external PWM dimming support. | Lower component count due to integrated FETs; limited to ≤42V LED strings and no high-side PMOS drive (PWMTG). | Select for cost-sensitive, lower-power (<15W) automotive interior lighting where integrated FETs reduce layout complexity. |
Compared with LT3965EFE#PBF and MAX20051ATP/V+, the LT8393EUFDM#PBF offers superior voltage range (100V VOUT), analog dimming flexibility, and proven EMI performance via spread spectrum-making it optimal for high-brightness exterior lighting where reliability and electromagnetic compatibility are critical.
Availability
LT8393EUFDM#PBF is available at Aetrix Electronics and suitable for automotive headlamps, high-voltage LED signage, battery-powered emergency lighting, and industrial machine vision illumination requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT8393EUFDM#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LT8393 product line was designed specifically for high-reliability, wide-input-range LED driver applications in automotive exterior lighting and industrial high-voltage illumination, emphasizing seamless mode transitions, low-EMI operation, and AEC-Q100 compliance.
FAQ
What is the maximum output voltage supported by the LT8393EUFDM#PBF?
The LT8393EUFDM#PBF supports a VOUT range of 0V to 100V, verified across its full operating temperature range (–40°C to +125°C). This allows direct driving of high-voltage LED strings without intermediate boost stages, and the absolute maximum rating for VOUT, ISP, and ISN pins is 100V - exceeding typical automotive LED module requirements.
Does the LT8393EUFDM#PBF support analog dimming, and what is its accuracy?
Yes, the LT8393EUFDM#PBF supports analog dimming via its CTRL pin, delivering 20:1 dimming range with ±4% LED current accuracy at 100mV full-scale threshold. The CTRL pin accepts 0.25V–1.35V input to linearly scale the current sense threshold from 0mV to 100mV, enabling precise luminance control without PWM artifacts in sensitive optical applications.
How does the LT8393EUFDM#PBF handle LED open-circuit and short-circuit faults?
The LT8393EUFDM#PBF detects open LED conditions when VFB > 0.95V and V(ISP–ISN) < 10mV, and short LED conditions when VFB < 0.25V. Upon detection, it asserts the open-drain FAULT pin low and executes user-configurable responses - hiccup mode (no SS resistor), latch-off (499k to SS), or continuous operation (100k to SS) - all without external supervision.
What package type and thermal characteristics does the LT8393EUFDM#PBF use?
The LT8393EUFDM#PBF uses a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed GND pad (Pin 29). Its thermal resistance is θJA = 43°C/W and θJC = 3.4°C/W, enabling efficient heat transfer to the PCB ground plane - critical for sustained 300mA+ LED current operation in sealed automotive housings.
Can the LT8393EUFDM#PBF be synchronized to an external clock, and what is the frequency range?
Yes, the LT8393EUFDM#PBF supports external clock synchronization via the SYNC/SPRD pin, accepting input frequencies from 350kHz to 2MHz - matching its internal oscillator range. When driven by an external clock, the device locks to that frequency with minimal jitter, enabling EMI reduction through frequency alignment in multi-converter systems.
LT8393EUFDM#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LT8393EUFDM#PBF FAQ
1.How can I place an order for LT8393EUFDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393EUFDM#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 LT8393EUFDM#PBF reliable?
The price and inventory of LT8393EUFDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393EUFDM#PBF is usually 5 days.
3.What payment methods are accepted for LT8393EUFDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393EUFDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393EUFDM#PBF?
LT8393EUFDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393EUFDM#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 LT8393EUFDM#PBF?
For technical support, including LT8393EUFDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393EUFDM#PBF requirements.
6.How does Aetrix verify that LT8393EUFDM#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393EUFDM#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 LT8393EUFDM#PBF meets industry standards.
7.What is the process for return or replacement of LT8393EUFDM#PBF?
All LT8393EUFDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393EUFDM#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 LT8393EUFDM#PBF part is unused and in its original packaging.
Return procedure for LT8393EUFDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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