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Analog Devices Inc. LT8393JUFDM#TRPBF
- Part No.:
- LT8393JUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT8393JUFDM#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,985
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Product details
Overview
LT8393JUFDM#TRPBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC designed for high-voltage, wide-input automotive and industrial LED driver applications. It supports 4V–60V input, 0V–100V output, ±4% LED current accuracy, 350kHz–2MHz adjustable switching frequency, and operates across buck, buck-boost, and boost regions with seamless low-noise transitions - enabling stable current regulation in headlamp and high-brightness lighting systems.
For engineers reviewing the LT8393JUFDM#TRPBF datasheet, LT8393JUFDM#TRPBF pinout, LT8393JUFDM#TRPBF application, or LT8393JUFDM#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, 28-pin side-wettable QFN (4mm × 5mm) package, 128:1 internal / 2000:1 external PWM dimming capability, integrated 5V INTVCC LDO, and proprietary peak-buck/peak-boost current mode control architecture.
Technical Context
The LT8393JUFDM#TRPBF implements a proprietary dual-mode current-mode control scheme that dynamically selects between peak-buck and peak-boost operation based on real-time VIN/VOUT ratio - with defined transition thresholds at 0.75 (buck-boost→boost), 0.85 (boost→buck-boost), 1.25 (buck→buck-boost), and 1.33 (buck-boost→buck). It uses a single inductor current sense resistor (LSP/LSN) and dual LED current sense inputs (ISP/ISN) to maintain precise regulation across all three operating regions.
Its fault protection includes open-LED detection (VFB > 0.95V & V(ISP−ISN) < 10mV), short-LED detection (VFB < 0.25V), overvoltage shutdown (VFB > 1.05V), and configurable FAULT response modes (hiccup, latch-off, or keep-running) set via external resistor on SS pin - all while maintaining AEC-Q100 Grade J (−40°C to +150°C junction) reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports 12V/24V/48V battery systems and cold-crank transients up to 60V. |
| Output Voltage Range | 0V to 100V - enables direct drive of long LED strings without external boost stages. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent brightness across temperature and line/load variations. |
| Switching Frequency | 350kHz to 2MHz (adjustable via RT pin) - allows EMI optimization and compact magnetics design. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for adaptive lighting. |
| Junction Temperature | −40°C to +150°C - qualified per AEC-Q100 Grade J for under-hood automotive use. |
| Package | 28-pin side-wettable QFN (4mm × 5mm) - supports automated optical inspection (AOI) and high-reliability solder joints. |
Pinout & Package
LT8393JUFDM#TRPBF is housed in a 28-lead plastic side-wettable QFN package (4mm × 5mm) with exposed thermal pad (Pin 29 = GND), 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 |
|---|---|---|
| VIN | Power input supply | Accepts 4V–60V input; powers internal LDO and gate drivers; requires ≥1µF local ceramic bypass. |
| VOUT | Output voltage sensing & PWMTG rail | Determines operating region (buck/buck-boost/boost); supplies high-side PMOS gate drive for PWMTG. |
| ISP / ISN | LED current sense differential inputs | Kelvin-connected across RLED; enable ±4% current regulation with 0–100mV full-scale range. |
| LSP / LSN | Inductor current sense differential inputs | Provide single-resistor inductor current feedback for peak-buck/peak-boost mode control and reverse-current detection. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Drive four external power switches; TG1/TG2 swing from SWx to BSTx; BG1/BG2 swing from GND to INTVCC. |
| BST1 / BST2 | Bootstrap floating supplies | BST1 integrates Schottky diode from INTVCC; BST2 requires external Schottky + capacitor to SW2. |
| CTRL | Analog dimming control input | Sets LED current threshold (0.25V–1.35V → 0–100mV); enables 20:1 analog dimming with ±4% accuracy. |
| PWM / RP | External/internal PWM dimming interface | PWM accepts 0–2V logic; RP sets internal dimming frequency (51kΩ → 1024× fSW). |
| FAULT | Open-drain fault reporting | Pulled low on open/short LED; status updated only during PWM high; requires external pull-up. |
| SS | Soft-start & fault mode configuration | Capacitor sets soft-start time; resistor to VREF configures fault response: hiccup (open), latch-off (499k), keep-running (100k). |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary peak-buck/peak-boost control | Enables continuous, low-noise transitions between buck, buck-boost, and boost regions without mode-hopping artifacts. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD = INTVCC reduces peak EMI by >10dB without affecting regulation stability. |
| 10V high-side PMOS gate drive (PWMTG) | Drives external high-side PWM switch with rail-to-rail swing (VOUT–10V to VOUT), eliminating need for level-shifting circuitry. |
| AEC-Q100 Grade J qualification | Guaranteed operation from −40°C to +150°C junction temperature with automotive-grade reliability testing and traceable lot control. |
| Configurable fault response | Three distinct LED fault behaviors (hiccup, latch-off, keep-running) selected via single resistor on SS pin - no firmware required. |
Applications
| Automotive Head Lamps | High-Voltage Industrial Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) systems requiring dynamic, high-precision LED current control across varying battery voltages (9V–16V) and string voltages (up to 80V). IC Role / Device Role / Timing Role: Primary LED current controller managing four external MOSFETs in 4-switch buck-boost topology with seamless region transitions. Use Value: Maintains ±4% LED current accuracy despite cold-crank (60V) and load-dump transients, enabling consistent photometric output and ASIL-B compliant safety monitoring via FAULT pin. | Use Scenario: High-bay LED fixtures powered from 48V DC microgrids, driving 100V LED strings in warehouse or factory environments. IC Role / Device Role / Timing Role: Constant-current LED driver supporting wide VIN/VOUT ratios and delivering 2000:1 PWM dimming for daylight harvesting and occupancy-based control. Use Value: Eliminates need for separate boost pre-regulators; achieves >93% efficiency at 80V/300mA (350kHz), reducing thermal stress and system footprint. |
| Battery-Powered Emergency Lighting | UV-C Sterilization Systems |
Use Scenario: Portable emergency egress lighting using Li-ion (3.0–4.2V/cell) or lead-acid (10–15V) batteries powering 36V–72V LED arrays. IC Role / Device Role / Timing Role: Wide-input buck-boost controller sustaining regulated LED current as battery discharges below LED forward voltage. Use Value: Single-inductor architecture avoids magnetic coupling issues; 4V minimum VIN enables deep discharge utilization while maintaining dimming fidelity down to 0.05% duty cycle. | Use Scenario: Pulsed UV-C LED arrays (36–100V, 350–700mA) used in medical sterilization devices requiring precise current pulses and thermal derating. IC Role / Device Role / Timing Role: High-accuracy current source with fast fault detection (open/short LED) and programmable thermal foldback via VC loop compensation. Use Value: ±4% current accuracy ensures repeatable germicidal dose delivery; FAULT pin integration simplifies safety interlock design per IEC 62471. |
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 5V/200mA boost regulator; fixed 2MHz switching; no spread spectrum; 40V max VOUT. | Targeted at lower-voltage LED arrays (<40V); lacks 100V output capability and AEC-Q100 qualification. | Select when VOUT ≤ 40V and integrated boost bias is preferred over external INTVCC management. |
| LM34927QMH/NOPB | 2-switch buck-boost LED controller; max 42V VOUT; no ISP/ISN differential sensing; ±8% current accuracy; no spread spectrum. | Designed for cost-sensitive, non-automotive applications; limited to simpler topologies and lower accuracy requirements. | Select for non-automotive, sub-42V LED systems where ±8% current tolerance is acceptable and AEC-Q100 is not required. |
Compared with LT3965EFE#TRPBF and LM34927QMH/NOPB, the LT8393JUFDM#TRPBF uniquely supports 100V output, ±4% LED current accuracy, AEC-Q100 Grade J operation, and flicker-free spread spectrum - making it the only option qualified for high-brightness automotive headlamps and industrial UV-C systems demanding precision and reliability.
Availability
LT8393JUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp designs, high-voltage industrial lighting systems, and battery-powered emergency lighting requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8393JUFDM#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 is engineered specifically for high-voltage, wide-input LED driver applications - emphasizing seamless buck/buck-boost/boost region transitions, ultra-low EMI, and AEC-Q100-compliant reliability in harsh environments.
FAQ
What is the maximum output voltage supported by the LT8393JUFDM#TRPBF?
The LT8393JUFDM#TRPBF supports a maximum output voltage of 100V, as specified in its absolute maximum ratings and confirmed across electrical characteristics tables. This enables direct drive of long LED strings without intermediate boost stages, and is validated for operation up to 100V under all operating conditions including transient surges and thermal extremes within its −40°C to +150°C junction temperature range.
Does the LT8393JUFDM#TRPBF include integrated gate drivers for external MOSFETs?
Yes, the LT8393JUFDM#TRPBF integrates four independent N-channel MOSFET gate drivers: TG1/BG1 for the buck-side switches and TG2/BG2 for the boost-side switches. TG1/TG2 provide high-side drive referenced to BST1/BST2 (up to 66V and 106V respectively), while BG1/BG2 provide low-side drive referenced to GND. These drivers eliminate the need for external driver ICs in 4-switch buck-boost LED applications.
How does the LT8393JUFDM#TRPBF achieve seamless transitions between buck, buck-boost, and boost operating regions?
The LT8393JUFDM#TRPBF uses a proprietary peak-buck/peak-boost current mode control architecture that continuously monitors the VIN/VOUT ratio and dynamically adjusts switching states. Transition thresholds are precisely defined (e.g., buck→buck-boost at VIN/VOUT = 1.25, buck-boost→boost at 0.75), with built-in hysteresis to prevent chattering. This ensures smooth, low-noise transitions without output disturbance or regulation loss - verified in typical performance waveforms across all three regions.
What fault protection features are implemented in the LT8393JUFDM#TRPBF?
The LT8393JUFDM#TRPBF provides open-LED detection (VFB > 0.95V & V(ISP−ISN) < 10mV), short-LED detection (VFB < 0.25V), and overvoltage shutdown (VFB > 1.05V). Fault status is reported on the open-drain FAULT pin, and response behavior (hiccup, latch-off, or keep-running) is configured via an external resistor on the SS pin - enabling robust, hardware-based safety compliance without software intervention.
Is the LT8393JUFDM#TRPBF qualified for automotive applications?
Yes, the LT8393JUFDM#TRPBF is AEC-Q100 qualified for automotive applications at Grade J (−40°C to +150°C junction temperature). Its datasheet explicitly lists "AEC-Q100 Qualified for Automotive Applications" under FEATURES, and the ordering table confirms LT8393JUFDM#TRPBF as a standard-grade part meeting this qualification - making it suitable for under-hood and headlamp systems requiring automotive reliability and traceability.
LT8393JUFDM#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)
LT8393JUFDM#TRPBF FAQ
1.How can I place an order for LT8393JUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393JUFDM#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 LT8393JUFDM#TRPBF reliable?
The price and inventory of LT8393JUFDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393JUFDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393JUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393JUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393JUFDM#TRPBF?
LT8393JUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393JUFDM#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 LT8393JUFDM#TRPBF?
For technical support, including LT8393JUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393JUFDM#TRPBF requirements.
6.How does Aetrix verify that LT8393JUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393JUFDM#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 LT8393JUFDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393JUFDM#TRPBF?
All LT8393JUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393JUFDM#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 LT8393JUFDM#TRPBF part is unused and in its original packaging.
Return procedure for LT8393JUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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