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Analog Devices Inc. LT8393HUFDM#PBF
- Part No.:
- LT8393HUFDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393HUFDM#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8393HUFDM#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 systems. 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 350kHz–2MHz adjustable switching frequency, and features AEC-Q100 qualification for automotive headlamp applications.
For engineers reviewing the LT8393HUFDM#PBF datasheet, LT8393HUFDM#PBF pinout, LT8393HUFDM#PBF application, or LT8393HUFDM#PBF equivalent, key selection criteria include its 4-switch single-inductor architecture enabling seamless VIN-above/VIN-below/VIN-equal-VOUT operation, integrated 10V high-side PMOS gate driver (PWMTG), proprietary peak-buck/peak-boost current mode control, and fault reporting via open/short LED detection with configurable retry/latch-off behavior.
Technical Context
The LT8393HUFDM#PBF implements a proprietary peak-buck/peak-boost current mode control scheme using a single inductor current sense resistor (LSP/LSN) and dual current comparators (A3/A4) to enable smooth transitions between buck, buck-boost, and boost regions without audible noise or output disturbance. Its region transition 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 two independent N-channel gate drivers (TG1/BG1 and TG2/BG2) with matched on-resistances (2.6Ω pull-up / 1.4Ω pull-down for TG1/TG2; 3.2Ω/1.2Ω for BG1/BG2), internal 5V INTVCC LDO (4.85–5.15V, 150mA limit), and 2V VREF reference (±2% over temperature). The VC error amplifier output interfaces directly with external RC compensation to set inductor current comparator thresholds.
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. |
| 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 line/load variations. |
| Switching Frequency | 350kHz to 2MHz - adjustable via RT resistor; supports EMI reduction via spread spectrum (SYNC/SPRD = INTVCC). |
| Dimming Ratio | 2000:1 external PWM, 128:1 internal PWM - meets stringent flicker-free dimming requirements in automotive lighting. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood and headlamp module deployment. |
| Package | 28-pin 4mm × 5mm side-wettable QFN (UFDM) - exposes thermal pad for enhanced PCB heat dissipation (θJC = 3.4°C/W). |
Pinout & Package
LT8393HUFDM#PBF uses a 28-lead (4mm × 5mm) plastic side-wettable QFN package with exposed GND pad (Pin 29) requiring soldering to PCB 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; must be bypassed with ≥1µF ceramic capacitor. |
| VOUT | Output supply rail | Determines operating region (buck/buck-boost/boost); serves as positive rail for PWMTG driver. |
| ISP / ISN | LED current sense inputs | Kelvin-connected across RLED to achieve ±4% current regulation accuracy; common-mode range 0–100V. |
| LSP / LSN | Inductor current sense inputs | Kelvin-connected across RSENSE to enable single-inductor 4-switch operation and reverse-current detection. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Drive external high-side/low-side switches; TG1/TG2 swing SWx-to-BSTx; BG1/BG2 swing GND-to-INTVCC. |
| PWMTG | High-side PMOS PWM switch driver | Inverted buffered PWM output; swing from (VOUT –10V) to VOUT; drives external PMOS for analog/digital dimming. |
| CTRL | Analog dimming control | Sets LED current threshold (0–100mV) with 20:1 linear range; 0.25V–1.15V yields 0–90mV; ≥1.35V fixes at 100mV. |
| FAULT | Open-drain fault indicator | Pulled low on open LED (VFB > 0.95V & V(ISP-ISN) < 10mV) or short LED (VFB < 0.25V); requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck and boost converters; reduces BOM count, board space, and EMI sources. |
| Flicker-free spread spectrum modulation | 25% triangle dither on internal oscillator when SYNC/SPRD tied to INTVCC - lowers peak EMI by >10dB without affecting regulation. |
| Configurable fault response | SS pin resistor selection (499k = latch-off, 100k = keep-running, no resistor = hiccup) enables system-level safety compliance. |
| 10V high-side PMOS gate driver (PWMTG) | Drives external PMOS switch directly - avoids level-shifter ICs and enables fast, low-loss PWM dimming up to 2000:1. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data - suitable for front-end automotive lighting modules. |
Applications
| Automotive Head Lamps | Industrial High-Voltage LED Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) and matrix LED headlamps requiring precise current control across 12V–48V battery inputs and 30–80V LED string outputs. IC Role / Device Role / Timing Role: Primary LED current controller managing four external MOSFETs and coordinating PWM dimming for individual pixel zones. Use Value: Seamless buck-boost transitions prevent visible light flicker during engine start/cranking; ±4% current accuracy ensures consistent photometric output across temperature. |
Use Scenario: Factory floor high-bay lighting powered from 48V DC microgrids, driving 100V LED strings with programmable dimming profiles. IC Role / Device Role / Timing Role: Constant-current buck-boost controller interfacing with DALI or 0–10V analog dimming inputs via CTRL and PWM pins. Use Value: 2000:1 external PWM dimming eliminates low-frequency ripple; 100V VOUT capability removes need for cascaded converters in high-lumen fixtures. |
| Battery-Powered Emergency Lighting | UV-C LED Disinfection Systems |
Use Scenario: Portable emergency exit signs using Li-ion packs (3.7V–12.6V) powering 24V–48V white LED arrays with runtime-optimized efficiency. IC Role / Device Role / Timing Role: Wide-input buck-boost LED driver maintaining constant current while battery voltage decays from 12.6V to 3.7V. Use Value: 93% peak efficiency at 350kHz extends battery life; 4V minimum VIN enables deep discharge utilization without shutdown. |
Use Scenario: Pulsed UV-C LED arrays (275nm, 30–60V forward voltage) requiring precise current pulses for germicidal efficacy and thermal management. IC Role / Device Role / Timing Role: Fast-response current controller synchronizing LED pulses with external timing signals via SYNC/SPRD pin. Use Value: 2MHz max switching frequency enables narrow pulse widths (<500ns); open/short LED fault detection prevents catastrophic failure of expensive UV-C diodes. |
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 integrated 40V MOSFETs; fixed 2MHz frequency; no external PWM dimming support. | Targeted at lower-power (<15W), space-constrained designs where integrated FETs reduce layout complexity. | Select LT3965EFE#PBF only if output current ≤ 1.2A and VOUT ≤ 40V; LT8393HUFDM#PBF remains preferred for >40V, >2A, or automotive-grade thermal robustness. |
| LM3423MH/NOPB | External N-channel controller supporting up to 60V VOUT; lacks buck-boost topology - requires separate buck+boost stages for wide VIN/VOUT ratios. | Suitable for cost-sensitive industrial lighting where VIN always > VOUT or VIN always < VOUT, not both. | Choose LM3423MH/NOPB only when system architecture mandates discrete buck and boost sections; LT8393HUFDM#PBF provides superior integration and efficiency in mixed-ratio applications. |
Compared with LT3965EFE#PBF and LM3423MH/NOPB, the LT8393HUFDM#PBF uniquely delivers 100V output capability, seamless 4-switch buck-boost operation, AEC-Q100 Grade H qualification, and 2000:1 external PWM dimming - making it the only option for high-reliability, high-voltage automotive and industrial LED systems requiring single-stage wide-ratio regulation.
Availability
LT8393HUFDM#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, and battery-powered emergency signage requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.
Supply support for LT8393HUFDM#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. (ADI) 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 developed specifically for high-efficiency, wide-input-range LED driver applications demanding seamless buck-boost operation, ultra-low EMI, and automotive-grade reliability - targeting next-generation adaptive lighting and smart illumination systems.
FAQ
What is the maximum output voltage supported by the LT8393HUFDM#PBF?
The LT8393HUFDM#PBF supports a maximum output voltage of 100V, as confirmed by its absolute maximum rating for VOUT, ISP, and ISN pins. This allows direct driving of high-voltage LED strings without intermediate boost stages, and is validated across the full –40°C to +150°C junction temperature range for the H-grade device.
Does the LT8393HUFDM#PBF support spread spectrum frequency modulation?
Yes, the LT8393HUFDM#PBF supports flicker-free spread spectrum modulation. When the SYNC/SPRD pin is tied to INTVCC, the internal oscillator adds 25% triangle dither to the switching frequency - reducing peak EMI emissions without compromising LED current regulation stability or dimming performance.
How does the LT8393HUFDM#PBF handle LED open-circuit faults?
The LT8393HUFDM#PBF detects open LED conditions when VFB exceeds 0.95V while V(ISP-ISN) falls below 10mV. Upon detection, it pulls the FAULT pin low and enters a user-configurable response mode - hiccup, latch-off (via 499k SS-to-GND resistor), or keep-running (via 100k SS-to-GND resistor) - as defined in the datasheet's fault protection section.
What is the purpose of the PWMTG pin on the LT8393HUFDM#PBF?
The PWMTG pin on the LT8393HUFDM#PBF is a buffered, inverted PWM output that drives an external high-side PMOS transistor. It swings from (VOUT –10V) to VOUT, enabling efficient analog or digital PWM dimming up to 2000:1 without requiring external level shifters or gate driver ICs - a key enabler for automotive-grade flicker-free lighting.
Is the LT8393HUFDM#PBF qualified for automotive applications?
Yes, the LT8393HUFDM#PBF is AEC-Q100 qualified for automotive applications. It is rated for a junction temperature range of –40°C to +150°C (Grade H), includes overtemperature protection, and is manufactured with controlled processes to meet automotive reliability and quality standards - making it suitable for headlamp, DRL, and interior lighting modules.
LT8393HUFDM#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)
LT8393HUFDM#PBF FAQ
1.How can I place an order for LT8393HUFDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393HUFDM#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 LT8393HUFDM#PBF reliable?
The price and inventory of LT8393HUFDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393HUFDM#PBF is usually 5 days.
3.What payment methods are accepted for LT8393HUFDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393HUFDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393HUFDM#PBF?
LT8393HUFDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393HUFDM#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 LT8393HUFDM#PBF?
For technical support, including LT8393HUFDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393HUFDM#PBF requirements.
6.How does Aetrix verify that LT8393HUFDM#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393HUFDM#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 LT8393HUFDM#PBF meets industry standards.
7.What is the process for return or replacement of LT8393HUFDM#PBF?
All LT8393HUFDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393HUFDM#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 LT8393HUFDM#PBF part is unused and in its original packaging.
Return procedure for LT8393HUFDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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