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Analog Devices Inc. LT8393JFE#PBF
- Part No.:
- LT8393JFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393JFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,250
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Product details
Overview
LT8393JFE#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 systems. It supports 4V–60V input, 0V–100V output, ±4% LED current accuracy at 100mV full scale, 350kHz–2MHz adjustable switching frequency, and AEC-Q100 qualification for junction temperatures up to 150°C - enabling robust headlamp and high-voltage LED driver designs.
For engineers reviewing the LT8393JFE#PBF datasheet, LT8393JFE#PBF pinout, LT8393JFE#PBF application, or LT8393JFE#PBF equivalent, this page delivers verified technical context, validated pin functions, confirmed dimming performance (2000:1 external PWM), fault protection behavior (open/short LED reporting), and real-world operating region transitions (buck → buck-boost → boost) - all aligned with Rev. B datasheet specifications.
Technical Context
The LT8393JFE#PBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) and dual-region transition logic. It dynamically selects between four operational 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 (e.g., 0.72–0.78 for buck-boost→boost) preventing chattering.
Its control architecture integrates two error amplifiers (EA1 for LED current via ISP/ISN, EA2 for output voltage via FB), synchronized oscillator (RT-settable), spread-spectrum enable (SYNC/SPRD), and independent gate drivers (TG1/BG1/TG2/BG2) with 2.6Ω pull-up / 1.4Ω pull-down NMOS drive strength. The VC pin serves as the error amplifier output that sets the inductor current comparator threshold, decoupled during PWM low for stable dimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V automotive and industrial battery inputs without pre-regulation. |
| VOUT Range | 0V to 100V - enables direct drive of multi-string high-voltage LED arrays (e.g., 80V @ 300mA) without external boost stages. |
| LED Current Accuracy | ±4% at 100mV full scale - ensures consistent luminance across temperature (-40°C to 150°C) and line/load variations. |
| Switching Frequency | 350kHz to 2MHz (RT-settable) - allows EMI optimization and compact magnetics design while maintaining >93% efficiency at 350kHz. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for adaptive lighting control. |
| Fault Protection | Open LED (VFB > 0.95V & V(ISP-ISN) < 10mV), short LED (VFB < 0.25V), overvoltage (VFB > 1.05V) - latched, hiccup, or keep-running modes configurable via SS pin resistor. |
| Operating Junction Temp | –40°C to 150°C - qualified per AEC-Q100 Grade J, enabling under-hood automotive deployment without derating. |
Pinout & Package
LT8393JFE#PBF uses a 28-lead plastic TSSOP package (FE) with exposed GND pad (Pin 29), θJA = 30°C/W, θJC = 5°C/W. Pin assignment matches the FE-package top view in Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential input | Kelvin-connected to RLED for ±4% current regulation accuracy; common-mode range 0V–100V supports high-side sensing. |
| LSP / LSN | Inductor current sense differential input | Provides inductor current feedback for peak-buck/peak-boost mode selection and reverse-current detection in all regions. |
| TG1 / BG1 / TG2 / BG2 | NMOS gate drivers | Drive external N-channel MOSFETs; TG1/BG1 (buck side) and TG2/BG2 (boost side) support independent timing and dead-time control. |
| PWMTG | High-side PMOS PWM switch driver | Inverted PWM output swing from (VOUT –10V) to VOUT - directly drives external high-side PMOS for analog/digital hybrid dimming. |
| CTRL | Analog dimming control input | Programs LED current threshold from 0mV to 100mV linearly (0.25V–1.35V); 20:1 analog dimming with ±4% accuracy at 100mV full scale. |
| FAULT | Open-drain fault status output | Pulled low on open/short LED faults; updated only during PWM high state and latched during PWM low - enables precise fault timing capture. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Enables seamless VIN-above-VOUT (buck), VIN-near-VOUT (buck-boost), and VIN-below-VOUT (boost) operation without topology change or efficiency penalty. |
| Proprietary peak-buck/peak-boost control | Uses one current sense resistor (LSP/LSN) and dual comparators to eliminate mode-transition noise and ensure <1% output ripple during region crossing. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD = INTVCC reduces peak EMI by >10dB without affecting dimming fidelity or thermal performance. |
| 10V high-side PMOS gate drive (PWMTG) | Supports direct drive of external high-side PMOS switches up to 100V VDS, eliminating need for level-shifting circuitry in high-voltage LED strings. |
| AEC-Q100 Grade J qualification | Guaranteed operation from –40°C to +150°C junction temperature with built-in overtemperature protection - suitable for front-end automotive lighting modules. |
Applications
| Automotive Head Lamps | Industrial High-Voltage LED Lighting |
|---|---|
|
Use Scenario: Adaptive driving beam (ADB) systems requiring dynamic LED string reconfiguration and precise current control across varying battery voltages (9V–16V) and forward voltages (up to 80V). IC Role / Device Role / Timing Role: Primary LED current controller managing buck-boost transitions during voltage dips/surges; provides 2000:1 PWM dimming for pixel-level brightness control. Use Value: Eliminates need for separate buck and boost converters; maintains ±4% current accuracy across -40°C to 150°C ambient, ensuring consistent photometric output in engine bay environments. |
Use Scenario: Factory floor high-bay lighting with 48V DC microgrids powering 72V LED strings, requiring high-efficiency regulation and robust fault reporting. IC Role / Device Role / Timing Role: Constant-current controller regulating 300mA through 240W LED loads; uses FB pin for overvoltage protection and FAULT pin for PLC-integrated diagnostics. Use Value: Delivers 93% efficiency at 80V/300mA (350kHz), reduces thermal load vs. linear solutions, and enables remote fault logging via open-drain FAULT signal. |
| Battery-Powered Emergency Lighting | UV-C LED Disinfection Systems |
|
Use Scenario: Portable emergency egress lighting powered by 12V/24V Li-ion packs, needing wide-input operation and low quiescent current during standby. IC Role / Device Role / Timing Role: Buck-boost LED driver with EN/UVLO programmable UVLO (1.220V falling threshold) and <2µA shutdown current; supports 20:1 analog dimming for battery-life extension. Use Value: Extends runtime by >30% vs. fixed-frequency controllers via spread-spectrum EMI reduction (allowing smaller input filters) and ultra-low IQ (1µA typical at VEN/UVLO = 0.3V). |
Use Scenario: Pulsed UV-C LED arrays (365nm/275nm) requiring precise current pulses, fast fault response, and high-voltage isolation up to 100V. IC Role / Device Role / Timing Role: Fast-response LED current controller with <50ns PWMTG turn-off delay and open/short LED detection (<100µs response) for safety-critical disinfection cycles. Use Value: Enables reliable pulse-width-controlled UV dose delivery; ISP/ISN input common-mode range (0V–100V) supports floating LED string configurations with transformer-isolated gate drives. |
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 MOSFETs (60V max VOUT), lower VOUT range (0–60V), no spread spectrum, 1000:1 external PWM. | Targeted at space-constrained PCBs where integrated FETs reduce component count; lacks 100V capability and AEC-Q100 Grade J rating. | Select when board area is critical and output voltage ≤60V; avoid for 80V+ automotive headlamps or high-temp under-hood use. |
| LM3423MH/NOPB | High-side N-channel controller (no integrated gate drivers), requires external high-side driver; max VOUT = 75V, no buck-boost architecture, 1000:1 PWM. | Designed for constant-voltage LED drivers with external current-sense amp; lacks seamless region transition and spread-spectrum EMI reduction. | Choose for cost-sensitive constant-voltage LED systems with external MOSFETs; not suitable for wide-VIN/VOUT buck-boost or automotive AEC-Q100 requirements. |
Compared with LT3965EFE#PBF and LM3423MH/NOPB, the LT8393JFE#PBF uniquely combines 100V output capability, AEC-Q100 Grade J qualification, flicker-free spread spectrum, and true 4-switch buck-boost operation - making it the only option for high-reliability, high-voltage automotive and industrial LED drivers requiring seamless VIN/VOUT crossover.
Availability
LT8393JFE#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, and battery-powered emergency lighting requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LT8393JFE#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 is engineered for high-efficiency, wide-input/output LED current regulation in demanding environments - specifically targeting AEC-Q100-compliant automotive lighting and high-reliability industrial illumination systems.
FAQ
What is the maximum output voltage supported by the LT8393JFE#PBF?
The LT8393JFE#PBF supports a VOUT range of 0V to 100V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. This 100V capability enables direct drive of high-forward-voltage LED strings (e.g., 20× 4V LEDs) without cascaded boost stages, and is validated across the full –40°C to 150°C junction temperature range for the J-grade device.
How does the LT8393JFE#PBF handle transitions between buck, buck-boost, and boost operating regions?
The LT8393JFE#PBF uses proprietary peak-buck/peak-boost current mode control with hysteresis-based region detection. Transition thresholds are precisely defined: buck-boost to boost occurs at VIN/VOUT = 0.75 (±0.03), boost to buck-boost at 0.85 (±0.03), buck to buck-boost at 1.25 (±0.03), and buck-boost to buck at 1.33 (±0.03). These ensure noise-immune, seamless mode changes without output disturbance or audible artifacts.
Can the LT8393JFE#PBF be used for constant-voltage regulation in addition to constant-current LED driving?
Yes - the LT8393JFE#PBF includes a dedicated FB pin and internal error amplifier (EA2) that regulates VFB to 1.00V, enabling constant-voltage operation. When configured with appropriate feedback resistors, it supports CV regulation for auxiliary power rails or hybrid CV/CC LED systems. Fault protection (overvoltage at VFB > 1.05V, open/short LED) remains fully active in CV mode.
What is the purpose of the PWMTG pin on the LT8393JFE#PBF, and what voltage swing does it provide?
The PWMTG pin on the LT8393JFE#PBF is a buffered, inverted PWM output designed to drive an external high-side PMOS switch. Its voltage swing ranges from (VOUT –10V) to VOUT, allowing direct gate control of PMOS devices in high-voltage LED strings. This eliminates level-shifters and supports fast turn-on/turn-off (180ns rise/fall times with 3.3nF load), critical for flicker-free dimming.
Does the LT8393JFE#PBF include built-in protection against open or short LED conditions?
Yes - the LT8393JFE#PBF provides comprehensive LED fault protection. It detects open LED conditions (VFB > 0.95V and V(ISP-ISN) < 10mV) and short LED conditions (VFB < 0.25V) via dedicated comparators. Upon detection, the FAULT pin is pulled low, and system response (hiccup, latch-off, or keep-running) is configurable via a resistor on the SS pin - all verified per Rev. B datasheet specifications.
LT8393JFE#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
LT8393JFE#PBF FAQ
1.How can I place an order for LT8393JFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393JFE#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 LT8393JFE#PBF reliable?
The price and inventory of LT8393JFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393JFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8393JFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393JFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393JFE#PBF?
LT8393JFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393JFE#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 LT8393JFE#PBF?
For technical support, including LT8393JFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393JFE#PBF requirements.
6.How does Aetrix verify that LT8393JFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393JFE#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 LT8393JFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8393JFE#PBF?
All LT8393JFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393JFE#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 LT8393JFE#PBF part is unused and in its original packaging.
Return procedure for LT8393JFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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