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Analog Devices Inc. LT3964HUHE#PBF
- Part No.:
- LT3964HUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LT3964HUHE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR I2C 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
LT3964HUHE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous buck LED driver IC with I²C interface, 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 200kHz–2MHz adjustable switching frequency, provides ±3% current regulation, and operates across –40°C to +150°C junction temperature range - ideal for automotive headlamp modules and industrial UV curing arrays.
For engineers reviewing the LT3964HUHE#PBF datasheet, LT3964HUHE#PBF pinout, LT3964HUHE#PBF application, or LT3964HUHE#PBF equivalent, key selection considerations include its dual independent 1.6A/40V buck topology, I²C-programmable True Color PWM™ dimming (8192:1), integrated OPENLED/SHORTLED fault reporting, PMOS gate driver for load-side disconnect, and 36-lead 5mm × 6mm QFN package with exposed thermal pad.
Technical Context
The LT3964HUHE#PBF implements peak-current-mode control with internal slope compensation and fixed-frequency oscillator synchronized via RT resistor or external clock. Each channel features independent current-sense amplifiers with rail-to-rail common-mode range, programmable current thresholds via CTRL pin voltage and 8-bit ADIM register, and dedicated FB pins enabling both constant-current LED driving and constant-voltage regulation with overvoltage/undervoltage protection.
Its I²C interface supports nine unique device addresses (via ADDR1/ADDR2), reads real-time fault status (OPENLED, SHORTLED, OVFB, thermal shutdown), writes PWM dimming registers and analog dimming gain, and enables configuration of fault masking, clock output duty cycle, and TSET-based thermal foldback - all without requiring additional microcontroller GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Current | 1.6A per channel - sets maximum LED string current with ±3% regulation accuracy over temp and line. |
| Input Voltage Range | 4V to 36V - supports wide-range automotive battery (cold-crank to load-dump) and industrial DC bus inputs. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT pin; enables optimization of efficiency vs. EMI vs. component size. |
| I²C Dimming Ratio | 8192:1 true-color PWM - preserves color consistency across full dimming range without flicker or color shift. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Package Thermal Resistance | θJC = 5°C/W - low junction-to-case resistance enables high-power dissipation with minimal heatsinking. |
| Fault Reporting | OPENLED, SHORTLED, OVFB, INTVCC UVLO, thermal shutdown - all reported via ALERT pin and I²C status register. |
Pinout & Package
LT3964HUHE#PBF is housed in a thermally enhanced 36-lead 5mm × 6mm plastic QFN package (UHE) with exposed PGND pad (Pin 37) that must be soldered to PCB for thermal and electrical performance. Pin functions are fully validated per Linear/ADI datasheet Rev. D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP1/ISP2 | Current sense positive input | Connects to high-side of current-sense resistor; also supplies power to PWMTG driver stage. |
| ISN1/ISN2 | Current sense negative input | Connects to low-side of current-sense resistor; forms differential pair with ISP for precise current regulation. |
| PWMTG1/PWMTG2 | PMOS gate driver output | Level-shifted inverted PWM signal drives external PMOS for LED string disconnect, PWM dimming, and fault isolation. |
| FB1/FB2 | Voltage feedback input | Regulated to 1.18V nominal; enables constant-voltage mode and detects OPENLED (VFB > 1.127V) or SHORTLED (VFB < 0.25V). |
| CTRL1/CTRL2 | Analog dimming threshold control | Sets current-sense reference via linear voltage scaling (0.2V–1.3V); enables temperature foldback or analog dimming. |
| ALERT | Open-drain fault indicator | Asserts low on any fault condition (OVFB, OPENLED, SHORTLED, thermal, INTVCC UVLO); latched until cleared via I²C or reset. |
| SDA/SCL | I²C bidirectional data/clock | Standard 400kHz I²C interface for reading faults, writing dimming registers, configuring masks and clock output. |
| TSET | Junction temperature foldback setpoint | Adjusts thermal derating breakpoint; internal VPTAT comparator reduces LED current above programmed junction temp. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck channels | Enables separate control of two LED strings (e.g., high/low beam) with no cross-talk or shared failure modes. |
| I²C-programmable True Color PWM™ | 8192:1 dimming ratio preserves spectral integrity and eliminates visible PWM artifacts in camera-sensitive applications. |
| Integrated PMOS gate driver (PWMTG) | Eliminates need for external level-shifting circuitry; enables fast, reliable LED string disconnect during fault conditions. |
| Programmable OPENLED/SHORTLED protection | Configurable detection thresholds and reporting via I²C allow system-level fault handling without hardware redesign. |
| Thermal foldback via TSET pin | Linear reduction of LED current above user-defined junction temperature prevents thermal runaway in sealed enclosures. |
| Internal LDO (INTVCC) | 4V regulated supply powers internal logic and gate drivers; supports ≤5mA external load without compromising stability. |
Applications
| Automotive Headlamp Control | Industrial UV Curing System |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with matrix LED array requiring independent high-beam pixel control and thermal management. IC Role / Device Role / Timing Role: Dual-channel constant-current driver with I²C addressability, real-time fault reporting, and thermal foldback for each LED segment. Use Value: Enables dynamic beam shaping while maintaining ASIL-B compliant fault coverage and 150°C ambient operation. | Use Scenario: High-intensity UV LED array used in conveyor-based adhesive curing, where stable optical power and rapid fault response are critical. IC Role / Device Role / Timing Role: Precision current source with ±3% regulation, OPENLED detection, and synchronized PWM dimming across multiple channels. Use Value: Ensures consistent UV dose delivery and immediate shutdown on open-circuit failure to prevent process defects. |
| Medical Endoscopic Illumination | Architectural Tunable White Lighting |
Use Scenario: Compact endoscope light engine requiring low-noise, flicker-free white light with precise color temperature control. IC Role / Device Role / Timing Role: Dual-channel driver powering warm-white and cool-white LED strings with independent I²C dimming and thermal monitoring. Use Value: Delivers 8192:1 True Color PWM™ dimming without color shift, meeting medical imaging spectral fidelity requirements. | Use Scenario: Smart building lighting system with tunable CCT (2700K–6500K) using RGBW LED arrays and centralized controller. IC Role / Device Role / Timing Role: Multi-channel current regulator with I²C address flexibility (9 options), synchronized switching, and fault logging for predictive maintenance. Use Value: Supports seamless integration into BACnet/KNX networks via microcontroller I²C interface and enables remote diagnostics. |
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#PBF | Same architecture but rated for –40°C to +125°C; lacks H-grade thermal qualification. | Not suitable for under-hood automotive or high-ambient industrial use where 150°C junction rating is required. | Select LT3964HUHE#PBF when operating junction temperature exceeds 125°C or automotive AEC-Q100 compliance is needed. |
| TPS92692QPWPRQ1 | TI part with integrated N-channel MOSFET drivers; no PWMTG output; uses analog/digital hybrid dimming (not I²C-native). | Lacks I²C fault register readback and True Color PWM™; requires external level shifters for PMOS disconnect. | Choose LT3964HUHE#PBF for systems requiring direct I²C register access, 8192:1 dimming, and integrated PMOS gate drive. |
Compared with LT3965EUHE#PBF and TPS92692QPWPRQ1, the LT3964HUHE#PBF uniquely combines H-grade thermal rating, I²C-native fault visibility, and integrated PWMTG drivers - enabling compact, high-reliability designs in space-constrained, high-temperature environments without external support circuitry.
Availability
LT3964HUHE#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial UV curing, medical illumination, and architectural tunable-white systems requiring stable component supply, long-term lifecycle support, and guaranteed high-temperature performance.
Supply support for LT3964HUHE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LT3964 product line was developed specifically for high-reliability, multi-string LED lighting applications demanding precision current regulation, robust fault protection, and intelligent digital control - targeting automotive, medical, and industrial markets.
FAQ
What is the maximum junction temperature rating for the LT3964HUHE#PBF?
The LT3964HUHE#PBF is specified for continuous operation from –40°C to +150°C junction temperature, making it suitable for under-hood automotive applications and high-ambient industrial environments. This H-grade qualification exceeds the E/I-grade versions (125°C max) and is verified per ADI's thermal characterization and lifetime reliability testing protocols.
Does the LT3964HUHE#PBF support true-color PWM dimming, and what is the resolution?
Yes, the LT3964HUHE#PBF supports True Color PWM™ dimming with an 8192:1 ratio via its native I²C interface. This high-resolution dimming preserves LED spectral characteristics across the entire range, eliminating visible flicker and color shift - critical for camera-equipped systems and medical lighting where color fidelity is essential.
How does the PWMTG pin function in the LT3964HUHE#PBF, and what external components are required?
The PWMTG pin in the LT3964HUHE#PBF is an inverted, level-shifted gate driver output referenced to ISP voltage, designed to directly drive the gate of an external PMOS transistor between ISP and the LED cathode. No level-shifter IC is needed; only a single PMOS (e.g., Si2302) and gate resistor are required to implement load-side disconnect, PWM dimming, and fault isolation.
Can the LT3964HUHE#PBF operate in constant-voltage mode, and how is it configured?
Yes, the LT3964HUHE#PBF supports constant-voltage regulation using the FB1/FB2 pins. When the current-sense voltage (VISP–ISN) falls below ~10mV, the FB loop takes control and regulates the output to 1.18V. To configure CV mode, connect FB to the output node via a resistive divider and disable current regulation by setting CTRL voltage < 0.2V or ADIM = 0x00.
What fault conditions trigger the ALERT pin on the LT3964HUHE#PBF, and how are they cleared?
The ALERT pin on the LT3964HUHE#PBF asserts low for six conditions: FB overvoltage (>1.233V), OPENLED (VFB > 1.127V and VISP–ISN < 10mV), SHORTLED (VFB < 0.25V), LED overcurrent (VISP–ISN > 930mV), INTVCC undervoltage (<3.1V), or thermal shutdown. Faults are latched and remain active until cleared via I²C command or device reset - not automatically upon fault removal.
LT3964HUHE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT3964HUHE#PBF FAQ
1.How can I place an order for LT3964HUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3964HUHE#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 LT3964HUHE#PBF reliable?
The price and inventory of LT3964HUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3964HUHE#PBF is usually 5 days.
3.What payment methods are accepted for LT3964HUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3964HUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3964HUHE#PBF?
LT3964HUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3964HUHE#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 LT3964HUHE#PBF?
For technical support, including LT3964HUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3964HUHE#PBF requirements.
6.How does Aetrix verify that LT3964HUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3964HUHE#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 LT3964HUHE#PBF meets industry standards.
7.What is the process for return or replacement of LT3964HUHE#PBF?
All LT3964HUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3964HUHE#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 LT3964HUHE#PBF part is unused and in its original packaging.
Return procedure for LT3964HUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3964HUHE#PBF Tags
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