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Analog Devices Inc. LT3964EUHE#TRPBF
- Part No.:
- LT3964EUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LT3964EUHE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR I2C 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
LT3964EUHE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down LED driver IC designed for constant-current and constant-voltage operation in high-reliability lighting systems. It delivers up to 1.6A per channel at up to 40V output, supports 4V–36V input, features I²C interface with 8192:1 True Color PWM dimming, ±3% current regulation, and operates across –40°C to +125°C junction temperature.
For engineers reviewing the LT3964EUHE#TRPBF datasheet, LT3964EUHE#TRPBF pinout, LT3964EUHE#TRPBF application, or LT3964EUHE#TRPBF equivalent, key selection criteria include dual independent buck topology, programmable current sense threshold via CTRL/ADIM, OPENLED/SHORTLED fault reporting, PMOS gate drive for load disconnect, and synchronization capability via SYNC/CLKOUT pin.
Technical Context
The LT3964EUHE#TRPBF implements peak-current-mode control with internal compensation, fixed-frequency operation (200kHz–2MHz), and rail-to-rail current-sense amplifier common-mode range. Its dual-channel architecture enables independent regulation of two LED strings without cross-coupling, while the I²C interface provides real-time fault status readback and register-based dimming control.
Each channel integrates top/bottom synchronous MOSFETs (200mΩ/180mΩ RDS(on)), supports external PMOS disconnect via PWMTG outputs, and includes dedicated protection circuitry: OPENLED detection (VFB < 1.127V & VISP–ISN < 10mV), SHORTLED (VFB < 0.25V), OVFB (VFB > 1.233V), and thermal shutdown - all reported through open-drain ALERT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Max Output Current per Channel | 1.6A - enables driving high-brightness LED strings up to 50W total (2 × 25W). |
| Switching Frequency Range | 200kHz to 2MHz - adjustable via RT resistor; allows optimization for efficiency (low f) or compact layout (high f). |
| I²C Dimming Resolution | 8192:1 True Color PWM - ensures flicker-free, high-fidelity color mixing in RGB/W lighting systems. |
| Current Regulation Accuracy | ±3% - guarantees consistent luminance across temperature and unit-to-unit variation. |
| Operating Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial, and medical lighting environments. |
| Fault Reporting Interface | Dedicated open-drain ALERT pin - asserts on OPENLED, SHORTLED, OVFB, INTVCC UVLO, or thermal shutdown. |
Pinout & Package
LT3964EUHE#TRPBF is housed in a thermally enhanced 36-lead 5mm × 6mm plastic QFN package (UHE) with exposed PGND pad (Pin 37) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP1/ISP2 | Current Sense Positive Input | High-side connection point for current-sense resistor; also supplies PWMTG gate drive rail. |
| ISN1/ISN2 | Current Sense Negative Input | Low-side connection for current-sense resistor; referenced to SGND for accurate differential measurement. |
| PWMTG1/PWMTG2 | PMOS Gate Driver Output | Inverted, level-shifted PWM signal (0V to ISP–7.5V) enabling external high-side PMOS switch for LED string disconnect and dimming. |
| FB1/FB2 | Voltage Feedback Input | Regulated to 1.18V nominal; used for CV mode or OPENLED/SHORTLED fault detection (thresholds at 1.127V/0.25V). |
| CTRL1/CTRL2 | Analog Current Threshold Control | Adjusts full-scale current sense threshold (97–103mV) linearly from 0.2V to 1.3V; enables analog dimming and thermal foldback. |
| EN/UVLO | Enable & Undervoltage Lockout | 1.18V falling threshold with programmable hysteresis; disables switching below valid input voltage. |
| SCL/SDA | I²C Serial Interface | Standard 400kHz I²C bus for reading faults, writing dimming registers (ADIM[7:0]), and configuring mask bits. |
| SYNC/CLKOUT | Frequency Synchronization Input / Clock Output | Accepts external clock for synchronization; outputs buffered oscillator when CONFIG[6] = 1 (50% duty, ≤2MHz). |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Buck Channels | Enables simultaneous, isolated control of two LED strings - no shared components or timing coupling required. |
| I²C Programmable Dimming & Fault Reporting | 8192:1 PWM + 10-bit ADIM register allows precise digital brightness control and real-time fault status readback (OPENLED/SHORTLED/OVFB). |
| Integrated PMOS Gate Drivers (PWMTG) | Drives external high-side PMOS for load disconnect, eliminating need for separate logic-level MOSFET drivers or optocouplers. |
| Programmable Thermal Foldback | TSET pin sets junction temperature threshold; automatically reduces LED current above setpoint to prevent thermal runaway. |
| Internal Compensation & Fixed-Frequency Operation | Reduces external component count and design complexity while maintaining stability over full input/output/load range. |
| 9 Unique I²C Addresses | ADDR1/ADDR2 pins support three-state (LOW/HIGH/FLOAT) configuration - enables up to 9 devices on same I²C bus without address conflict. |
Applications
| Automotive Headlamp Systems | Industrial Machine Vision Lighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with independently controlled high-beam segments and dynamic beam shaping. IC Role / Device Role / Timing Role: Dual-channel constant-current source regulating two separate LED arrays; I²C enables real-time dimming and fault logging per zone. Use Value: ±3% current matching ensures uniform luminance across beam zones; OPENLED detection prevents single-string failure from disabling entire headlamp. |
Use Scenario: High-speed inspection systems requiring strobed, spectrally stable illumination synchronized to camera exposure. IC Role / Device Role / Timing Role: Precision current source with sub-microsecond PWM response and SYNC/CLKOUT alignment to camera trigger signal. Use Value: 8192:1 True Color PWM enables fine-grained intensity control without color shift; 2MHz max switching supports short-duration, high-current pulses. |
| Medical Endoscopic Light Sources | Architectural RGBW Tunable White Lighting |
Use Scenario: Compact, fanless endoscope light engine requiring low EMI, high reliability, and thermal derating under continuous operation. IC Role / Device Role / Timing Role: Dual-channel LED driver with TSET-based thermal foldback and integrated fault reporting for safety-critical diagnostics. Use Value: –40°C to +125°C rating supports sterilization cycles; ALERT pin integration simplifies compliance with IEC 60601-1 fault monitoring requirements. |
Use Scenario: Smart ceiling fixture with independently dimmable red, green, blue, and white LED channels for CCT and intensity tuning. IC Role / Device Role / Timing Role: Four-channel control achieved using two LT3964EUHE#TRPBF ICs (each handling two strings); I²C enables coordinated color mixing. Use Value: 9 configurable I²C addresses allow daisy-chaining multiple fixtures; ±3% current accuracy preserves color fidelity across units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965EUHE#TRPBF | Same pinout and feature set, but rated for –40°C to +150°C junction temperature (H-grade); higher thermal robustness. | Required for under-hood automotive modules exceeding 125°C ambient or extended-life industrial enclosures. | Select LT3965EUHE#TRPBF when operating junction temperature exceeds 125°C or AEC-Q100 qualification is mandated. |
| MAX20051ATPA/VY+ | Single-channel 2.5A LED driver with integrated boost converter; no I²C interface; uses analog/digital PWM inputs only. | Lacks dual-channel independence and digital fault reporting; suitable only for simpler, lower-channel-count designs. | Choose MAX20051ATPA/VY+ only if single-channel operation suffices and I²C telemetry is unnecessary. |
Compared with LT3965EUHE#TRPBF, the LT3964EUHE#TRPBF offers identical functionality at lower cost and thermal rating, making it optimal for commercial/industrial lighting where 125°C junction limit is sufficient; versus MAX20051ATPA/VY+, LT3964EUHE#TRPBF provides true dual-channel isolation, comprehensive I²C diagnostics, and superior dimming resolution - critical for high-end tunable lighting.
Availability
LT3964EUHE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial machine vision systems, medical endoscopes, and architectural tunable-white lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3964EUHE#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, formed by the acquisition of Linear Technology in 2017.
The LT3964EUHE#TRPBF belongs to ADI's Power by Linear™ LED driver product line, engineered specifically for high-efficiency, high-reliability constant-current LED control in demanding automotive, industrial, and medical applications.
FAQ
What is the maximum switching frequency supported by the LT3964EUHE#TRPBF?
The LT3964EUHE#TRPBF supports an adjustable switching frequency range from 200kHz to 2MHz, set by an external resistor on the RT pin. At RT = 27.4kΩ, the typical frequency is 2.0MHz - enabling compact magnetics and fast transient response in space-constrained designs. Frequency synchronization via the SYNC/CLKOUT pin is also supported.
Does the LT3964EUHE#TRPBF support both constant-current and constant-voltage operation?
Yes, the LT3964EUHE#TRPBF supports both modes. In constant-current mode, regulation is achieved via the ISP/ISN differential sense path with ±3% accuracy. In constant-voltage mode, the FB1/FB2 pins regulate to 1.18V nominal, enabling use with resistive loads or as a general-purpose DC/DC converter - with built-in OPENLED and SHORTLED protection.
How does the I²C interface of the LT3964EUHE#TRPBF enable LED fault monitoring?
The LT3964EUHE#TRPBF uses its I²C interface to report real-time fault status including OPENLED, SHORTLED, OVFB, INTVCC undervoltage, and thermal shutdown. These flags are stored in the chip status register and can be read back by the host microcontroller; the open-drain ALERT pin asserts low when any fault occurs, providing hardware-level interrupt signaling.
Can the LT3964EUHE#TRPBF drive external PMOS transistors for LED string disconnect?
Yes, the LT3964EUHE#TRPBF provides dedicated PWMTG1 and PWMTG2 outputs that deliver an inverted, level-shifted gate drive signal (0V to ISP–7.5V) to control external high-side PMOS transistors. This enables safe LED string disconnect during fault conditions or PWM dimming without requiring additional level-shifting circuitry.
What thermal protection mechanisms are implemented in the LT3964EUHE#TRPBF?
The LT3964EUHE#TRPBF includes overtemperature protection that triggers thermal shutdown above 150°C junction temperature. Additionally, the TSET pin allows programming a lower thermal foldback threshold: when internal VPTAT exceeds the TSET voltage, LED current is progressively reduced to maintain safe operating temperature - critical for sealed or convection-limited enclosures.
LT3964EUHE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.6A
- Frequency:
- 2MHz
- Dimming:
- I2C, PWM
- Applications:
- General Purpose, Industrial, Medical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT3964EUHE#TRPBF FAQ
1.How can I place an order for LT3964EUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3964EUHE#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 LT3964EUHE#TRPBF reliable?
The price and inventory of LT3964EUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3964EUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3964EUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3964EUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3964EUHE#TRPBF?
LT3964EUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3964EUHE#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 LT3964EUHE#TRPBF?
For technical support, including LT3964EUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3964EUHE#TRPBF requirements.
6.How does Aetrix verify that LT3964EUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3964EUHE#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 LT3964EUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3964EUHE#TRPBF?
All LT3964EUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3964EUHE#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 LT3964EUHE#TRPBF part is unused and in its original packaging.
Return procedure for LT3964EUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3964EUHE#TRPBF Tags
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