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Analog Devices Inc. LT8393EFE#PBF
- Part No.:
- LT8393EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393EFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,165
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Product details
Overview
LT8393EFE#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 seamless transitions between buck/buck-boost/boost regions. It is used in automotive headlamps where VIN may vary from cold-crank (6V) to load-dump (60V) while driving 80V LED strings.
For engineers reviewing the LT8393EFE#PBF datasheet, LT8393EFE#PBF pinout, LT8393EFE#PBF application, or LT8393EFE#PBF equivalent, key selection considerations include its peak-buck/peak-boost current mode architecture, 10V high-side PMOS gate drive (PWMTG), AEC-Q100 qualification (E-grade: –40°C to 125°C), open/short LED fault reporting via FAULT pin, and support for both internal (2000:1) and external (128:1) PWM dimming.
Technical Context
The LT8393EFE#PBF implements a proprietary dual-mode current sensing scheme using a single inductor sense resistor (LSP/LSN) and dual comparators (A3 for peak-buck, A4 for peak-boost) to maintain stable regulation across VIN/VOUT ratios from 0.72 to 1.36. Its control logic dynamically selects operation region-buck (VIN/VOUT ≥ 1.33), buck-boost (0.75 ≤ VIN/VOUT ≤ 1.28), or boost (VIN/VOUT ≤ 0.78)-with hysteresis to prevent mode chattering.
It integrates two independent bootstrap drivers (BST1/BST2) with dedicated top-gate (TG1/TG2) and bottom-gate (BG1/BG2) outputs, enabling efficient N-channel MOSFET control in all regions. The VC error amplifier output sets the current comparator threshold, while FB monitors output voltage for overvoltage, open-LED, and short-LED protection with configurable latch/hiccup modes via SS pin resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports automotive cold-crank (6V) and load-dump (60V) transients without external protection. |
| VOUT Range | 0V to 100V - enables direct drive of multi-string high-voltage LED arrays up to 80V typical. |
| 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 pin; allows EMI optimization and inductor size reduction. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for adaptive lighting. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade E for under-hood automotive use. |
| Efficiency | Up to 95% - achieved at 24W (80V, 300mA) in buck-boost region, minimizing thermal design burden. |
Pinout & Package
LT8393EFE#PBF is housed in a 28-lead plastic TSSOP package (FE) with exposed GND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 30°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED for ±4% current regulation accuracy; common-mode range 0V–100V. |
| LSP / LSN | Inductor current sense differential inputs | Single-resistor sensing for peak-buck/peak-boost mode detection and reverse-current protection. |
| TG1 / BG1 / TG2 / BG2 | N-MOSFET gate drivers | Independent high-side (TG1/TG2) and low-side (BG1/BG2) drivers with integrated bootstrap diodes (BST1) and external bootstrap caps (BST2). |
| PWMTG | Inverted PWM top-gate driver | Drives external high-side PMOS switch with rail-to-rail swing (VOUT–10V to VOUT) for precise LED string shutoff. |
| FAULT | Open-drain fault status output | Pulled low on open LED (VFB > 0.95V & VISP-ISN < 10mV) or short LED (VFB < 0.25V); latched or hiccup configurable via SS pin. |
| CTRL | Analog dimming input | Programs LED current threshold from 0mV to 100mV linearly (0.25V–1.15V); 20:1 analog dimming with ±4% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary peak-buck/peak-boost control | Enables single-inductor, seamless transition between buck/buck-boost/boost without audible noise or regulation dropout. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD pin reduces peak EMI by >10dB without compromising regulation stability. |
| Integrated 5V LDO (INTVCC) | Supplies internal circuitry and gate drivers; 150mA current limit and 3.54V UVLO ensure robust startup under low-VIN conditions. |
| AEC-Q100 Grade E qualification | Validated for automotive applications including headlamps, DRLs, and fog lamps with guaranteed operation from –40°C to 125°C. |
| Configurable fault response | SS pin resistor selects open/short LED behavior: 499kΩ = latch-off, 100kΩ = keep-running, no resistor = hiccup retry. |
Applications
| Automotive Headlamps | Industrial High-Voltage LED Lighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED array requiring dynamic voltage scaling from 12V battery to 80V string during beam shaping. IC Role / Device Role / Timing Role: Primary LED current controller managing 4-switch power stage; regulates current while transitioning between buck (engine running) and boost (cold crank) as VIN varies from 6V–16V. Use Value: Eliminates need for separate buck and boost controllers; maintains ±4% current accuracy across 13.3:1 VIN range and 0–100V VOUT. |
Use Scenario: Outdoor stadium lighting using 48–96V LED strings powered from 48V DC microgrids with variable solar input. IC Role / Device Role / Timing Role: Constant-current buck-boost controller enabling single-stage conversion from 24–60V input to regulated 80V/350mA output. Use Value: Achieves 93% efficiency at 24W (80V, 300mA) with low EMI spread-spectrum mode meeting CISPR-15 Class B limits. |
| Automotive Running Lamps (DRL) | Battery-Powered Emergency Lighting |
Use Scenario: Daytime running lamp with 32V LED string powered from 12V vehicle bus, requiring stable brightness during engine start (6.5V) and alternator regulation (14.5V). IC Role / Device Role / Timing Role: Wide-VIN LED driver operating in buck-boost region; uses CTRL pin for 20:1 analog dimming synchronized to ambient light sensor. Use Value: Maintains constant luminance across 6.5V–14.5V input with <1% current variation; fault reporting prevents thermal runaway during LED open-circuit. |
Use Scenario: Portable emergency beacon using Li-ion battery (3.0–4.2V/cell × 3) to drive 36V LED string with 2000:1 PWM dimming for battery-life extension. IC Role / Device Role / Timing Role: Boost-mode LED controller with internal PWM dimming; RP pin sets 2000:1 dimming ratio without external MCU timing. Use Value: Enables ultra-low standby current (<2µA shutdown) and extends runtime by dimming to 0.05% duty cycle without visible flicker. |
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 DAC dimming, and built-in fault diagnostics; lower max VOUT (60V) and narrower VIN (4.5V–60V). | Requires digital control infrastructure; suited for smart lighting with telemetry, not standalone analog systems. | Select LT3965EFE#PBF when I²C configurability, fault logging, or tighter dimming resolution (0.1%) is required over analog simplicity. |
| LM3423MH/NOPB | High-side N-MOSFET controller for boost-only LED drivers; supports up to 75V VOUT but lacks buck/buck-boost capability and integrated current sense amplifiers. | Needs external current sense amp and separate buck converter for VIN > VOUT; no seamless region transition. | Select LM3423MH/NOPB only for fixed-boost applications with existing buck pre-regulation and minimal BOM cost priority. |
Compared with LT3965EFE#PBF and LM3423MH/NOPB, the LT8393EFE#PBF uniquely combines analog simplicity, 100V VOUT capability, and true 4-switch buck-boost operation in a single IC-enabling compact, high-reliability designs for automotive and industrial LED systems without digital overhead or topology limitations.
Availability
LT8393EFE#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage LED lighting, and battery-powered emergency beacons requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8393EFE#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 LT8393EFE#PBF belongs to Analog Devices' Power by Linear™ LED controller product line, engineered specifically for high-reliability, wide-input-range LED driver applications demanding seamless buck-boost operation and automotive-grade robustness.
FAQ
What is the maximum output voltage supported by the LT8393EFE#PBF?
The LT8393EFE#PBF supports a VOUT range of 0V to 100V, as specified in its absolute maximum ratings and electrical characteristics. This enables direct drive of high-voltage LED strings-such as 80V automotive headlamp arrays-without cascaded converters. Operation above 80V requires careful layout for voltage stress and creepage, and the IC maintains regulation integrity up to its 100V limit.
Does the LT8393EFE#PBF support both analog and PWM dimming simultaneously?
No-the LT8393EFE#PBF supports analog dimming via the CTRL pin (20:1 range, ±4% accuracy) or PWM dimming via the PWM pin (2000:1 external, 128:1 internal), but not concurrently. When PWM dimming is active (PWM pin driven), the CTRL pin is overridden. For hybrid control, external logic must gate the PWM signal based on CTRL-derived brightness level, as the IC does not internally combine both methods.
How is fault protection configured on the LT8393EFE#PBF?
Fault protection on the LT8393EFE#PBF-covering open LED, short LED, and overvoltage-is configured via the SS pin. A 499kΩ resistor to GND enables latch-off mode; 100kΩ enables keep-running; no resistor enables hiccup retry. The FAULT pin reports status as an open-drain output, updated only during PWM high time and latched low during PWM low time, ensuring reliable fault capture in dimmed states.
What package type and thermal performance does the LT8393EFE#PBF use?
The LT8393EFE#PBF uses a 28-lead plastic TSSOP package (FE) with exposed GND pad (Pin 29). Its thermal resistance is θJA = 30°C/W and θJC = 5°C/W when mounted on a 2-layer PCB with 1-in² 2-oz copper pour under the exposed pad. This enables operation up to 125°C junction temperature with appropriate heatsinking, satisfying AEC-Q100 Grade E requirements.
Can the LT8393EFE#PBF operate in boost-only mode without buck functionality?
Yes-the LT8393EFE#PBF automatically operates in boost mode when VIN/VOUT ≤ 0.78, as defined by its region transition thresholds. However, it cannot be forced into *exclusive* boost-only operation; if VIN rises above ~0.85×VOUT, it transitions into buck-boost mode. For pure boost applications with no risk of VIN exceeding VOUT, external enable logic or VIN clamping may be used-but the IC's architecture inherently supports all three regions.
LT8393EFE#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8393EFE#PBF FAQ
1.How can I place an order for LT8393EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393EFE#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 LT8393EFE#PBF reliable?
The price and inventory of LT8393EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8393EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393EFE#PBF?
LT8393EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393EFE#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 LT8393EFE#PBF?
For technical support, including LT8393EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393EFE#PBF requirements.
6.How does Aetrix verify that LT8393EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8393EFE#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 LT8393EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8393EFE#PBF?
All LT8393EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393EFE#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 LT8393EFE#PBF part is unused and in its original packaging.
Return procedure for LT8393EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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