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Analog Devices Inc. LT8393HFE#TRPBF
- Part No.:
- LT8393HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8393HFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,994
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Product details
Overview
LT8393HFE#TRPBF 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 qualification for automotive headlamp applications.
For engineers reviewing the LT8393HFE#TRPBF datasheet, LT8393HFE#TRPBF pinout, LT8393HFE#TRPBF application, or LT8393HFE#TRPBF equivalent, key selection criteria include VIN/VOUT region transition behavior, peak-buck/peak-boost current mode control, internal/external PWM dimming ratio (128:1 / 2000:1), high-side PMOS gate drive capability, and open/short LED fault reporting with configurable response modes.
Technical Context
The LT8393HFE#TRPBF implements Analog Devices' proprietary peak-buck/peak-boost current mode control using a single inductor current sense resistor (LSP/LSN) to enable seamless transitions across buck (VIN ≫ VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN ≪ VOUT) regions - with verified transition thresholds at VIN/VOUT = 0.75, 0.85, 1.25, and 1.33. Its dual-region current sensing architecture eliminates refresh noise in pure buck or boost operation.
It integrates two independent NMOS gate drivers (TG1/BG1 and TG2/BG2) with 2.6Ω pull-up / 1.4Ω pull-down on TG outputs and 3.2Ω / 1.2Ω on BG outputs, plus dedicated BST1/BST2 bootstrap supplies. The VC error amplifier output interfaces with external RC compensation, while the SS pin enables soft-start timing and fault-mode selection (hiccup/latch-off/keep-running) via resistor configuration.
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 up to 100V forward voltage. |
| 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 resistor; supports EMI-sensitive layouts and compact magnetics design. |
| PWM Dimming Ratio | 2000:1 external / 128:1 internal - delivers flicker-free dimming down to 0.05% duty cycle for premium lighting control. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive environments per AEC-Q100 Grade H. |
| Efficiency | Up to 95% - demonstrated at 24W (80V, 300mA) in 350kHz buck-boost operation. |
Pinout & Package
LT8393HFE#TRPBF is housed in a 28-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 29 = GND). Thermal resistance θJA = 30°C/W, θJC = 5°C/W. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP / ISN | LED current sense differential inputs | Kelvin-connected to RLED for ±4% current regulation accuracy; supports 0–100V common-mode range. |
| 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 | NMOS gate drivers | Drive external high-side/low-side FETs; TG outputs swing SW-to-BST, BG outputs swing GND-to-INTVCC. |
| BST1 / BST2 | Bootstrap floating supplies | BST1 includes integrated Schottky diode; BST2 requires external Schottky + capacitor for high-side NMOS drive. |
| PWMTG | Inverted PWM top-gate driver | Drives external high-side PMOS switch with rail-to-rail swing (VOUT–10V to VOUT) for low-noise PWM dimming. |
| CTRL | Analog dimming input | Programs LED current threshold from 0.25V to 1V; enables 20:1 analog dimming with ±4% accuracy. |
| FAULT | Open-drain fault indicator | Pulled low on open LED (VFB > 0.95V & VISP–ISN < 10mV) or short LED (VFB < 0.25V); supports latch-off/hiccup modes. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary peak-buck/peak-boost control | Enables continuous conduction across VIN/VOUT ratios from 0.75 to 1.33 without mode-hopping or audible noise. |
| Flicker-free spread spectrum | 25% triangle modulation on SYNC/SPRD = INTVCC reduces peak EMI by >10dB without compromising regulation stability. |
| 10V high-side PMOS gate drive (PWMTG) | Eliminates need for level-shifting circuitry when driving external high-side PMOS for PWM dimming. |
| Configurable fault response | SS pin resistor selection (499k = latch-off, 100k = keep-running, open = hiccup) tailors safety behavior to system requirements. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data supporting automotive front-lighting systems. |
Applications
| Automotive Head Lamps | High-Voltage LED Street Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) headlamp with dynamic zone control requiring precise current regulation across 12V–48V battery transients and 40V–80V LED string voltages. IC Role / Device Role / Timing Role: Primary LED current controller managing 4-switch buck-boost topology with seamless region transitions and fault-safe shutdown. Use Value: Maintains ±4% LED current accuracy during cold-crank (4.5V) and load-dump (60V) events while enabling 2000:1 PWM dimming for pixel-level brightness control. | Use Scenario: Outdoor municipal LED streetlight operating from 300–480VAC rectified bus with 70–100V LED strings and thermal derating requirements. IC Role / Device Role / Timing Role: Constant-current controller regulating high-voltage LED output using single-inductor 4-switch architecture to minimize BOM count and EMI filtering. Use Value: Delivers 95% efficiency at 80V/300mA while supporting 350kHz–2MHz frequency tuning to avoid AM radio band interference and reduce heatsink size. |
| Industrial Machine Vision Lighting | Emergency Vehicle Warning Lights |
Use Scenario: High-intensity strobed lighting for factory floor inspection systems requiring microsecond-level PWM timing precision and zero current droop between pulses. IC Role / Device Role / Timing Role: Synchronous buck-boost controller with PWMTG-driven external PMOS switch delivering clean, jitter-free PWM edges. Use Value: Achieves <200ns PWM-to-PWMTG propagation delay and <180ns rise/fall times for sub-10µs pulse widths with stable current regulation. | Use Scenario: Red/blue flashing warning lights in emergency vehicles powered from 12V/24V batteries with wide ambient temperature range (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with open/short LED fault detection and latch-off response to prevent thermal runaway during field failures. Use Value: Guarantees fail-safe operation via AEC-Q100 Grade H qualification and integrated overtemperature protection active above 150°C junction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8393EFE#TRPBF | Same silicon, rated for –40°C to +125°C junction temperature (vs. +150°C for H-grade). | Suitable for non-automotive industrial or commercial lighting where extended temperature margin is not required. | Select LT8393HFE#TRPBF for under-hood automotive use; LT8393EFE#TRPBF for cost-sensitive indoor applications. |
| LT3965EFE#TRPBF | Dual-channel 60V synchronous buck LED controller; no buck-boost capability; max VOUT = 60V; no spread spectrum. | Applicable only when input always exceeds output and lower voltage compliance (<60V) is acceptable. | Choose LT3965EFE#TRPBF for simpler, lower-cost dual-LED-string designs with fixed step-down topology. |
Compared with LT8393EFE#TRPBF, the LT8393HFE#TRPBF adds 25°C higher junction rating and automotive qualification; compared with LT3965EFE#TRPBF, it provides true 4-switch buck-boost operation, 100V output support, and integrated spread spectrum-enabling single-chip solutions for variable VIN/VOUT lighting systems.
Availability
LT8393HFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, high-voltage LED street lighting, and industrial machine vision systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8393HFE#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 was developed specifically for high-reliability, wide-input-range LED driver applications demanding seamless buck/buck-boost/boost transitions, ultra-low EMI, and automotive-grade robustness.
FAQ
What is the maximum output voltage supported by the LT8393HFE#TRPBF?
The LT8393HFE#TRPBF supports a VOUT range of 0V to 100V, enabling direct drive of high-voltage LED strings such as those used in street lighting and architectural applications. This specification is validated across the full –40°C to +150°C operating junction temperature range and applies to both buck-boost and boost operating regions of the LT8393HFE#TRPBF.
Does the LT8393HFE#TRPBF support spread spectrum frequency modulation?
Yes, the LT8393HFE#TRPBF supports flicker-free triangle spread spectrum modulation. When the SYNC/SPRD pin is tied to INTVCC, the device operates with 25% frequency deviation above its base switching frequency - reducing peak EMI emissions without affecting LED current regulation stability or PWM dimming performance of the LT8393HFE#TRPBF.
How does the LT8393HFE#TRPBF handle LED open-circuit faults?
The LT8393HFE#TRPBF detects open LED conditions when VFB exceeds 0.95V and V(ISP–ISN) falls below 10mV. Upon detection, it pulls the FAULT pin low and enters a user-configurable response mode - hiccup, latch-off (via 499k SS-to-VREF resistor), or keep-running (via 100k resistor) - ensuring safe, predictable behavior in automotive and industrial systems using the LT8393HFE#TRPBF.
What is the purpose of the PWMTG pin on the LT8393HFE#TRPBF?
The PWMTG pin on the LT8393HFE#TRPBF provides an inverted, buffered version of the internal or external PWM signal, optimized to drive an external high-side PMOS transistor. Its output swings from (VOUT –10V) to VOUT, eliminating level-shifters and enabling low-noise, high-speed PWM dimming - a critical feature for flicker-free operation in premium lighting systems using the LT8393HFE#TRPBF.
Can the LT8393HFE#TRPBF operate with input voltage below output voltage?
Yes, the LT8393HFE#TRPBF is explicitly designed for buck-boost operation and functions seamlessly when VIN is below VOUT (boost mode), above VOUT (buck mode), or equal to VOUT (buck-boost boundary). Its proprietary peak-buck/peak-boost current mode control ensures stable regulation and low-noise transitions across all three regions - a core capability of the LT8393HFE#TRPBF.
LT8393HFE#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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT8393HFE#TRPBF FAQ
1.How can I place an order for LT8393HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8393HFE#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 LT8393HFE#TRPBF reliable?
The price and inventory of LT8393HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8393HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8393HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8393HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8393HFE#TRPBF?
LT8393HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8393HFE#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 LT8393HFE#TRPBF?
For technical support, including LT8393HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8393HFE#TRPBF requirements.
6.How does Aetrix verify that LT8393HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8393HFE#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 LT8393HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8393HFE#TRPBF?
All LT8393HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8393HFE#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 LT8393HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8393HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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