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Analog Devices Inc. LT8393EFE#TRPBF
- Part No.:
- LT8393EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393EFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,846
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Product details
Overview
LT8393EFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost LED controller IC designed for wide-input, high-output LED driver applications. It regulates LED current across input voltages from 4V to 60V and output voltages from 0V to 100V, supports seamless region transitions (buck/buck-boost/boost), delivers ±4% LED current accuracy at 100mV full scale, and features 350kHz–2MHz adjustable switching frequency - ideal for automotive headlamps and industrial high-voltage lighting systems.
For engineers reviewing the LT8393EFE#TRPBF datasheet, LT8393EFE#TRPBF pinout, LT8393EFE#TRPBF application, or LT8393EFE#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating ranges, real-world dimming performance data (2000:1 external PWM, 128:1 internal PWM), and AEC-Q100 Grade E (–40°C to 125°C) qualification details critical for automotive-grade design-in.
Technical Context
The LT8393EFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN), enabling smooth, low-noise transitions between buck (VIN ≫ VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN ≪ VOUT) regions - with defined transition thresholds at VIN/VOUT = 0.75, 0.85, 1.25, and 1.33. Its dual-region current sensing avoids top MOSFET refresh noise in pure buck or boost modes.
It integrates two independent gate drivers (TG1/BG1 for buck side; TG2/BG2 for boost side), 10V high-side PMOS PWM switch drive (PWMTG), internal 5V LDO (INTVCC), 2V reference (VREF), and fault detection logic for open/short LED conditions - all coordinated via VC error amplifier output and FB voltage loop feedback referenced to 1.00V.
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 long LED strings (e.g., 30× 3.3V LEDs) or high-voltage signage. |
| 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 compact magnetics selection. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - supports flicker-free dimming down to 0.05% duty cycle for architectural lighting. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade E for under-hood automotive use. |
| Package | 28-lead TSSOP (FE) with exposed GND pad - provides θJC = 5°C/W thermal path for high-power LED driver PCBs. |
Pinout & Package
LT8393EFE#TRPBF uses a 28-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 29 = GND). The package has θJA = 30°C/W and requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential input | Kelvin-connected across RLED for ±4% current regulation accuracy; supports 0–100V common-mode range. |
| LSP / LSN | Inductor current sense differential input | Monitors inductor current for peak-buck/peak-boost mode control and reverse-current protection. |
| TG1 / BG1 / BST1 / SW1 | Buck-side power switch interface | Drives N-channel MOSFETs in buck topology; BST1 includes integrated Schottky diode for bootstrap charging. |
| TG2 / BG2 / BST2 / SW2 | Boost-side power switch interface | Drives N-channel MOSFETs in boost topology; BST2 requires external Schottky diode and capacitor. |
| VOUT | Output voltage rail reference | Sets operation region (buck/buck-boost/boost); also supplies PWMTG high-side gate drive rail (VOUT –10V to VOUT). |
| CTRL | Analog dimming control input | Programs LED current threshold from 0.25V to 1.00V; enables 20:1 analog dimming with ±4% accuracy. |
| PWM / RP / PWMTG | External/internal PWM dimming interface | PWM accepts 0–2V logic; RP sets internal dimming frequency; PWMTG drives external high-side PMOS switch. |
| FB | Voltage loop feedback input | Regulates VFB to 1.00V for constant-voltage operation and detects open/short LED faults (0.25V/0.95V thresholds). |
| FAULT | Open-drain fault reporting output | Pulled low on open LED (VFB > 0.95V & VISP–ISN < 10mV) or short LED (VFB < 0.25V); latched or hiccup mode configurable via SS resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor architecture | Eliminates need for separate buck + boost stages; reduces BOM count, board space, and EMI vs. cascaded solutions. |
| Flicker-free spread spectrum (SSFM) | 25% triangle modulation on SYNC/SPRD = INTVCC reduces peak EMI by >10dB without compromising regulation stability. |
| Proprietary peak-buck/peak-boost control | Enables continuous conduction mode across all VIN/VOUT ratios with no audible noise or output ripple discontinuity. |
| Integrated 5V/150mA INTVCC LDO | Powers internal logic and gate drivers directly from VIN; eliminates need for external bias supply in most designs. |
| AEC-Q100 Grade E qualification | Validated for automotive ambient temperatures (–40°C to +125°C) and lifetime reliability per stress test requirements. |
Applications
| Automotive Head Lamps | Industrial High-Voltage Lighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) requiring dynamic beam shaping and 0–100% dimming across 12V–48V vehicle battery range. IC Role / Device Role / Timing Role: Primary LED current controller managing buck-to-boost transitions during engine cranking (VIN dip) and load dump (VIN surge). Use Value: Maintains ±4% LED current accuracy and seamless region transitions without visible flicker or brightness step changes. |
Use Scenario: Outdoor LED signage with 72V string voltage powered from 48V DC distribution bus in factory automation systems. IC Role / Device Role / Timing Role: Constant-current driver enabling direct 48V-to-72V boost operation without intermediate converters. Use Value: Achieves 93% efficiency at 80V/300mA (24W) while meeting CISPR-25 Class 5 conducted EMI limits via SSFM mode. |
| Battery-Powered Emergency Lighting | UV-C LED Disinfection Systems |
Use Scenario: Portable emergency light using Li-ion battery (3.0–4.2V/cell × 3) driving 24V LED array with runtime optimization. IC Role / Device Role / Timing Role: Wide-input buck-boost controller supporting 9V–12.6V input while regulating 24V/500mA output. Use Value: Delivers >90% efficiency across entire battery discharge curve and supports 2000:1 PWM dimming for low-power standby mode. |
Use Scenario: Pulsed UV-C LED driver for surface disinfection requiring precise 100ns–10ms pulse widths and high peak current. IC Role / Device Role / Timing Role: Fast-response current controller with PWMTG output driving external PMOS for sub-microsecond LED turn-on/turn-off. Use Value: PWMTG propagation delay <230ns (on/off) and rise/fall times <180ns enable accurate pulse timing without LED tail current. |
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 I²C interface, 0–60V VOUT, but limited to 40V VIN max and no SSFM mode. | Best suited for digitally controlled smart lighting where I²C telemetry is required; lacks AEC-Q100 qualification. | Select when digital configuration and fault logging are prioritized over automotive qualification and ultra-low EMI. |
| LM3423MH/NOPB | High-side N-channel controller only (no integrated buck-boost topology); requires external FETs and separate boost/buck ICs for wide VIN/VOUT. | Used in cost-sensitive industrial lighting where discrete topology flexibility outweighs integration benefits. | Select when BOM cost is primary constraint and design team has expertise in multi-IC power stage layout and loop compensation. |
Compared with LT3965EFE#TRPBF and LM3423MH/NOPB, the LT8393EFE#TRPBF uniquely combines AEC-Q100 Grade E qualification, 60V VIN/100V VOUT capability, integrated spread spectrum, and seamless buck/buck-boost/boost transitions - making it the only single-chip solution qualified for demanding automotive exterior lighting applications.
Availability
LT8393EFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-voltage lighting, and battery-powered emergency lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8393EFE#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. (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 is designed specifically for high-reliability, wide-input-range LED driver applications - emphasizing seamless topology transitions, low-EMI operation, and automotive-grade robustness in single-inductor 4-switch architectures.
FAQ
What is the maximum output voltage supported by the LT8393EFE#TRPBF?
The LT8393EFE#TRPBF supports a VOUT range of 0V to 100V, as specified in its absolute maximum ratings and electrical characteristics table. This enables direct drive of high-voltage LED strings up to 100V without external boost stages. Operation at 100V output is validated across the full –40°C to +125°C temperature range for the LT8393EFE#TRPBF grade.
Does the LT8393EFE#TRPBF support spread spectrum frequency modulation?
Yes, the LT8393EFE#TRPBF supports flicker-free spread spectrum modulation. When the SYNC/SPRD pin is tied to INTVCC, the device operates in 25% triangle spread spectrum mode above its base switching frequency - reducing peak EMI emissions without affecting LED current regulation stability or introducing visible flicker.
How does the LT8393EFE#TRPBF handle LED open-circuit and short-circuit faults?
The LT8393EFE#TRPBF detects open LED conditions when VFB > 0.95V and V(ISP–ISN) < 10mV, and short LED conditions when VFB < 0.25V. Upon detection, it pulls the FAULT pin low and enters a user-configurable response mode (hiccup, latch-off, or keep-running) set via resistor selection on the SS pin - ensuring system-level safety and diagnostics.
What is the purpose of the PWMTG pin on the LT8393EFE#TRPBF?
The PWMTG pin on the LT8393EFE#TRPBF provides a buffered, inverted version of the PWM input signal, optimized to drive an external high-side PMOS transistor. Its voltage swing ranges from (VOUT –10V) to VOUT, enabling fast, low-loss PWM dimming control of the LED string with propagation delays under 230ns and rise/fall times under 180ns.
Is the LT8393EFE#TRPBF qualified for automotive applications?
Yes, the LT8393EFE#TRPBF is AEC-Q100 qualified for automotive applications at Grade E (–40°C to +125°C junction temperature). It meets stress testing requirements for temperature cycling, humidity, and mechanical shock - making it suitable for under-hood and exterior lighting systems including headlamps and DRLs.
LT8393EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8393EFE#TRPBF FAQ
1.How can I place an order for LT8393EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393EFE#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 LT8393EFE#TRPBF reliable?
The price and inventory of LT8393EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393EFE#TRPBF?
LT8393EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393EFE#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 LT8393EFE#TRPBF?
For technical support, including LT8393EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393EFE#TRPBF requirements.
6.How does Aetrix verify that LT8393EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393EFE#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 LT8393EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393EFE#TRPBF?
All LT8393EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393EFE#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 LT8393EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8393EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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