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Analog Devices Inc. LT8393HFE#PBF
- Part No.:
- LT8393HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393HFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT8393HFE#PBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC designed for wide-input, high-output LED current regulation in automotive and industrial lighting. It supports 4V–60V input, 0V–100V output, ±4% LED current accuracy, 350kHz–2MHz adjustable switching frequency, and AEC-Q100 Grade H (–40°C to +150°C) operation - enabling headlamp and high-voltage LED driver designs with seamless mode transitions.
For engineers reviewing the LT8393HFE#PBF datasheet, LT8393HFE#PBF pinout, LT8393HFE#PBF application, or LT8393HFE#PBF equivalent, key selection criteria include VIN/VOUT overlap capability, internal/external PWM dimming ratio (128:1 / 2000:1), high-side PMOS gate drive (10V), open/short LED fault reporting, and spread-spectrum EMI reduction - all validated for automotive-grade thermal reliability.
Technical Context
The LT8393HFE#PBF 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 selects between four operating states - peak-buck in buck, peak-buck in buck-boost, peak-boost in buck-boost, and peak-boost in boost - based on real-time VIN/VOUT ratio, with hysteresis to prevent chattering.
Its control architecture integrates two error amplifiers (EA1 for LED current, EA2 for VOUT regulation), dual current comparators (A3 for buck, A4 for boost), synchronized oscillator with RT/SYNC/SPRD interface, and independent gate drivers (TG1/BG1/TG2/BG2) with 2.6Ω/3.2Ω pull-up and 1.4Ω/1.2Ω pull-down RDS(on), enabling efficient 4-switch operation without top MOSFET refresh noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V automotive battery rails including cold-crank and load-dump transients. |
| VOUT Range | 0V to 100V - enables direct driving 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) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI compliance. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for adaptive lighting control. |
| Operating Temp | –40°C to +150°C (Junction) - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Efficiency | Up to 95% - achieved in buck-boost region with low RDS(on) gate drivers and seamless region transitions minimizing switching loss. |
Pinout & Package
LT8393HFE#PBF uses a 28-lead plastic TSSOP package (FE) with exposed GND pad (Pin 29), θJA = 30°C/W, θJC = 5°C/W. Pin functions are validated per Analog Devices Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to sense resistor for ±4% LED current regulation accuracy across temperature. |
| LSP / LSN | Inductor current sense differential inputs | Enable single-inductor 4-switch operation and reverse-current detection in all regions. |
| TG1 / BG1 / TG2 / BG2 | N-channel MOSFET gate drivers | Drive external high-side/low-side switches with 2.6Ω/1.4Ω (TG) and 3.2Ω/1.2Ω (BG) RDS(on) for low conduction loss. |
| PWMTG | Inverted PWM top-gate driver | Drives external high-side PMOS switch with rail-to-rail swing (VOUT –10V to VOUT) for precise PWM dimming control. |
| CTRL | Analog dimming threshold input | Sets LED current via 0.25V–1.35V analog voltage; provides 20:1 linear dimming range with ±4% accuracy. |
| FAULT | Open-drain fault status output | Asserts low on open LED (VFB > 0.95V & V(ISP-ISN) < 10mV) or short LED (VFB < 0.25V); configurable latch/hiccup behavior. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck/boost converters; supports VIN above, below, or equal to VOUT with no topology change. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD pin reduces peak EMI by >10dB without affecting dimming performance. |
| Seamless region transition | Hysteresis-controlled mode switching (e.g., buck-boost → boost at VIN/VOUT = 0.72–0.78) prevents output disturbance during input transients. |
| AEC-Q100 Grade H qualification | Validated for continuous operation at 150°C junction temperature - suitable for engine compartment headlamp modules. |
| Integrated 5V LDO (INTVCC) | Supplies internal logic and gate drivers from VIN; 150mA current limit and 3.54V UVLO enable robust startup under low-VIN conditions. |
Applications
| Automotive Head Lamps | Industrial High-Voltage Lighting |
|---|---|
Use Scenario: Adaptive front-lighting systems (AFS) requiring dynamic beam shaping and high-luminance output in compact form factor. IC Role / Device Role / Timing Role: Primary LED current controller regulating up to 100V string voltage from 12V/24V battery with AEC-Q100-compliant thermal margin. Use Value: Seamless buck-boost transitions maintain stable LED current during engine start-stop cycles and load-dump events. | Use Scenario: Factory floor high-bay LED fixtures powered from 48V DC microgrids with stringent EMI limits. IC Role / Device Role / Timing Role: Synchronous 4-switch buck-boost controller enabling single-stage 48V-to-80V conversion with spread-spectrum EMI suppression. Use Value: 95% peak efficiency and 25% triangle spread spectrum meet CISPR-11 Class B conducted/radiated emission requirements. |
| Battery-Powered Emergency Lighting | UV-C LED Disinfection Systems |
Use Scenario: Portable emergency exit signs using Li-ion (3.7V–4.2V/cell) or lead-acid (12V) batteries powering multi-string white LEDs. IC Role / Device Role / Timing Role: Wide-input LED driver supporting 4V–60V VIN range and delivering constant current across full battery discharge curve. Use Value: 2000:1 external PWM dimming enables ultra-low standby power (<2µA shutdown current) and smooth brightness ramping. | Use Scenario: Pulsed UV-C LED arrays (365nm/275nm) requiring precise current control and fast PWM dimming for germicidal dose management. IC Role / Device Role / Timing Role: High-accuracy LED current controller with ±4% regulation and 128:1 internal PWM dimming for calibrated irradiance output. Use Value: ISP/ISN Kelvin sensing and dedicated current comparator ensure stable UV output despite forward voltage drift over lifetime. |
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, lower max VOUT (60V), same 4V–60V VIN, but no spread spectrum. | Targeted at digitally controlled lighting systems requiring addressable channel management, not analog-dimming-focused headlamps. | Select when system-level digital control and channel synchronization outweigh need for analog dimming fidelity and EMI reduction. |
| LM3423MH/NOPB | High-side N-channel controller with external FETs; supports up to 75V VOUT, but only buck-boost (no pure buck/boost), no integrated gate drivers. | Used in cost-sensitive industrial LED drivers where discrete FET selection and layout flexibility are prioritized over integration. | Select when design requires custom MOSFET optimization or operates exclusively in buck-boost region with lower VOUT ceiling. |
Compared with LT3965EFE#PBF and LM3423MH/NOPB, the LT8393HFE#PBF uniquely combines AEC-Q100 Grade H qualification, 100V VOUT capability, integrated spread spectrum, and seamless 4-region operation - making it the only option qualified for automotive headlamp use with full VIN/VOUT overlap and analog dimming precision.
Availability
LT8393HFE#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 reliability.
Supply support for LT8393HFE#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8393 product line was engineered specifically for high-reliability, wide-input-range LED current regulation in harsh environments - emphasizing seamless buck/buck-boost/boost transitions, automotive-grade thermal robustness, and low-EMI operation.
FAQ
What is the maximum output voltage supported by the LT8393HFE#PBF?
The LT8393HFE#PBF supports a VOUT range of 0V to 100V, verified per Absolute Maximum Ratings (VOUT, ISP, ISN ≤ 100V) and Electrical Characteristics tables. This enables direct driving of high-voltage LED strings without cascaded converters, and is confirmed in both typical application schematics and thermal derating curves across the full –40°C to +150°C junction temperature range.
Does the LT8393HFE#PBF support spread-spectrum frequency modulation?
Yes, the LT8393HFE#PBF supports flicker-free spread-spectrum operation: tying the SYNC/SPRD pin to INTVCC activates a 25% triangle modulation centered on the internal oscillator frequency. This feature is explicitly documented in the FEATURES section and validated in Typical Performance Characteristics (Figure G30), reducing peak EMI without compromising PWM dimming integrity.
How does the LT8393HFE#PBF handle open or short LED faults?
The LT8393HFE#PBF detects open LED (VFB > 0.95V & V(ISP-ISN) < 10mV) and short LED (VFB < 0.25V) conditions via dedicated comparators. The FAULT pin pulls low, and behavior (retry/hiccup, latch-off, or keep-running) is configured via resistor values on the SS pin - 499k for latch-off, 100k for keep-running, and open for hiccup - as detailed in the PIN FUNCTIONS section.
What is the operating temperature grade of the LT8393HFE#PBF?
The LT8393HFE#PBF is rated for –40°C to +150°C junction temperature and is AEC-Q100 qualified as Grade H. This is confirmed in the ORDER INFORMATION table (LT8393H part marking) and Electrical Characteristics notes, distinguishing it from LT8393E (–40°C to +125°C) and LT8393J (–40°C to +150°C, non-AEC-Q100).
Can the LT8393HFE#PBF operate with input voltage equal to output voltage?
Yes, the LT8393HFE#PBF is explicitly designed for VIN = VOUT operation within its buck-boost region, with seamless transitions confirmed at VIN/VOUT ratios from 0.72 to 1.36. The block diagram, OPERATION section, and Figure F03 (Operation Region vs VIN/VOUT) confirm stable regulation at unity ratio - critical for automotive applications where battery voltage closely matches LED string voltage.
LT8393HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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
- Supplier Device Package:
- 28-TSSOP-EP
LT8393HFE#PBF FAQ
1.How can I place an order for LT8393HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393HFE#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 LT8393HFE#PBF reliable?
The price and inventory of LT8393HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8393HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393HFE#PBF?
LT8393HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393HFE#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 LT8393HFE#PBF?
For technical support, including LT8393HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393HFE#PBF requirements.
6.How does Aetrix verify that LT8393HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393HFE#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 LT8393HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8393HFE#PBF?
All LT8393HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393HFE#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 LT8393HFE#PBF part is unused and in its original packaging.
Return procedure for LT8393HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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