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Analog Devices Inc. LT3964RUHE-1#PBF
- Part No.:
- LT3964RUHE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LT3964RUHE-1#PBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 1.6A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:183
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Product details
Overview
LT3964RUHE-1#PBF from Analog Devices 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 2A per channel at up to 40V output, supports 200kHz–2MHz adjustable switching frequency, provides ±3% current regulation accuracy, and enables 8192:1 true-color PWM dimming via I²C - used in automotive headlamps and medical surgical lighting.
For engineers reviewing the LT3964RUHE-1#PBF datasheet, LT3964RUHE-1#PBF pinout, LT3964RUHE-1#PBF application, or LT3964RUHE-1#PBF equivalent, key selection considerations include its dual independent 2A/40V buck topology, I²C-addressable fault reporting (OPENLED/SHORTLED/OVFB), programmable thermal foldback via TSET, rail-to-rail CTRL pin analog dimming capability, and 36-pin 5mm × 6mm QFN package with exposed PGND pad.
Technical Context
The LT3964RUHE-1#PBF implements peak-current-mode control with internal slope compensation and dual independent error amplifiers - one per channel - each regulating either LED current (via ISP–ISN differential sense) or output voltage (via FB pin). Its I²C interface manages 8-bit ADIM registers, fault status flags, and CONFIG bits including clock output enable and address configuration.
Each channel features dedicated PWMTG outputs for external PMOS disconnect switches, synchronized switching via RT resistor or external SYNC signal, and integrated protection including overcurrent (930mV threshold), OPENLED detection (VFB < 1.127V + V(ISP–ISN) < 10mV), SHORTLED (VFB < 250mV), and thermal shutdown - all reported through the 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 | 2A - enables driving high-brightness LED strings (e.g., 8× 26V LEDs) with ±3% regulation accuracy. |
| Switching Frequency Range | 200kHz to 2MHz - adjustable via RT pin resistor; allows EMI optimization and inductor size reduction. |
| I²C Dimming Resolution | 8192:1 - enables flicker-free, high-fidelity color mixing in RGBW lighting systems. |
| Current Sense Threshold Accuracy | ±3% over –40°C to 150°C - ensures stable LED brightness across extreme ambient conditions. |
| Package | 36-pin 5mm × 6mm QFN with exposed PGND pad - provides low-thermal-resistance (θJC = 5°C/W) for high-power LED driver thermal management. |
| Fault Reporting | OPENLED / SHORTLED / OVFB / OC / INTVCC UVLO / Thermal Shutdown - all latched and readable via I²C status register; asserted on open-drain ALERT pin. |
Pinout & Package
LT3964RUHE-1#PBF is housed in a 36-pin plastic QFN package (5mm × 6mm) with exposed power ground (PGND) pad (Pin 37), requiring soldering to PCB for thermal and electrical integrity. θJA = 43°C/W, θJC = 5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP1, ISP2 | Positive current sense input | Connects to high-side of current-sense resistor; also supplies gate drive for external PMOS disconnect switch. |
| ISN1, ISN2 | Negative current sense input | Connects to low-side of current-sense resistor; forms differential pair with ISP for precise LED current measurement. |
| PWMTG1, PWMTG2 | PMOS gate driver output | Level-shifted inverted PWM signal (ISP − 7.5V min) to drive external high-side PMOS for LED string disconnect and dimming. |
| FB1, FB2 | Voltage feedback input | Regulates to 1.18V nominal; enables constant-voltage mode and detects OPENLED (VFB > 1.127V) or SHORTLED (VFB < 250mV). |
| CTRL1, CTRL2 | Analog dimming & thermal foldback control | Sets current sense threshold scale (0.2V–1.3V range); enables analog dimming or junction temperature-based current derating. |
| RT | Frequency setting input | Resistor-to-GND sets switching frequency (200kHz–2MHz); must not be left floating. |
| SYNC/CLKOUT | External sync input / buffered clock output | Accepts external logic-level sync signal; when enabled, outputs internal oscillator clock (50% duty cycle, ≤50pF load). |
| SDA, SCL | I²C bidirectional data/clock | Open-drain interface supporting standard-mode (400kHz) I²C; 9 unique device addresses configurable via ADDR1/ADDR2 pins. |
| ALERT | Open-drain fault indicator | Asserts low on any active fault condition (OVFB, OPENLED, SHORTLED, OC, INTVCC UVLO, thermal shutdown); requires external pull-up. |
| PGND (Pin 37) | Power ground return | Exposed thermal pad; must be soldered to PCB copper pour for thermal dissipation and low-noise bottom-switch return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2A synchronous buck channels | Enables separate dimming, fault monitoring, and thermal management for two LED strings - e.g., high-beam/low-beam or RGB/white channels. |
| I²C-programmable 8192:1 true-color PWM dimming | Eliminates visible flicker and color shift in high-speed imaging environments (e.g., endoscopy, machine vision) without external PWM generators. |
| Programmable OPENLED/SHORTLED protection with reporting | Prevents system failure by disabling affected channel and signaling fault via ALERT and I²C status register - critical for safety-critical lighting. |
| Rail-to-rail CTRL pin analog dimming + I²C ADIM register | Supports hybrid dimming: analog control for coarse adjustment and digital fine-tuning, plus temperature-dependent current foldback via CTRL voltage. |
| Internal compensation and 9 I²C addresses | Reduces BOM count and layout complexity; enables daisy-chained multi-driver systems (e.g., large-area architectural lighting) without address conflicts. |
Applications
| Automotive Adaptive Front Lighting | Medical Surgical Headlight Systems |
|---|---|
|
Use Scenario: High-intensity LED arrays in adaptive driving beam (ADB) modules requiring independent per-pixel current control and real-time fault detection. IC Role / Device Role / Timing Role: Dual-channel constant-current source with I²C-addressable dimming and OPENLED reporting per segment - enabling dynamic beam shaping and ASIL-B compliance. Use Value: Enables pixel-level LED control with <10µs fault response time and 8192:1 dimming resolution - meeting UNECE R149 photometric requirements. |
Use Scenario: Sterile, flicker-free illumination in surgical microscopes and endoscopes where color fidelity and zero EMI interference are mandatory. IC Role / Device Role / Timing Role: Constant-current LED driver with I²C-controlled true-color PWM dimming and isolated fault reporting - eliminating 120Hz strobing and RF noise coupling into imaging sensors. Use Value: Delivers flicker-free 6000K white light with <0.1% RMS current ripple and no conducted EMI above 150kHz - satisfying IEC 60601-2-57 immunity requirements. |
| Industrial Machine Vision Lighting | Avionics Cabin Mood Lighting |
|
Use Scenario: High-speed stroboscopic LED arrays synchronized to camera exposure timing in automated optical inspection (AOI) systems. IC Role / Device Role / Timing Role: Dual-channel buck driver with external SYNC input and programmable minimum on/off times (20ns/10ns) - enabling sub-microsecond LED turn-on for precise exposure control. Use Value: Achieves <50ns timing jitter between LED flash and camera trigger - ensuring consistent image contrast and defect detection at 10k fps. |
Use Scenario: Multi-zone, color-tunable LED lighting in commercial aircraft cabins requiring DALI-compatible dimming and fail-safe redundancy. IC Role / Device Role / Timing Role: Dual-channel constant-current driver with I²C addressability and independent fault isolation - supporting zone-level dimming and hot-swap maintenance without full-system shutdown. Use Value: Provides certified Class III SELV operation, 150°C junction rating, and latchable fault reporting - meeting DO-160G Section 22 lightning-induced transient immunity. |
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 |
|---|---|---|---|
| LT3964EUHE#PBF | Same silicon die but rated for –40°C to 125°C (vs. –40°C to 150°C for LT3964RUHE-1#PBF); identical pinout, I²C interface, and feature set. | Not qualified for under-hood automotive or high-temp industrial enclosures exceeding 125°C ambient. | Select LT3964RUHE-1#PBF when junction temperature >125°C is expected; otherwise LT3964EUHE#PBF offers cost advantage. |
| TLC59621RGER | 16-channel constant-current LED sink driver with SPI interface; no buck conversion, no I²C, max 120mA/channel, no OPENLED/SHORTLED reporting. | Limited to low-power indicator LEDs; lacks high-voltage capability, thermal foldback, or fault isolation per channel. | Use only for low-power, multi-segment status lighting; not suitable for high-brightness or safety-critical applications served by LT3964RUHE-1#PBF. |
Compared with LT3964EUHE#PBF, LT3964RUHE-1#PBF extends junction temperature rating to 150°C for under-hood use, while TLC59621RGER trades channel count and interface simplicity for absence of buck conversion, fault protection, and thermal robustness - making it unsuitable as a functional replacement.
Availability
LT3964RUHE-1#PBF is available at Aetrix Electronics and suitable for automotive front lighting, medical surgical illumination, and industrial machine vision applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3964RUHE-1#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 LT3964 product line was engineered specifically for high-reliability, high-dynamic-range LED lighting systems - combining precision current regulation, robust fault protection, and digital configurability in thermally optimized packages.
FAQ
What is the maximum operating junction temperature for LT3964RUHE-1#PBF?
The LT3964RUHE-1#PBF is specified for operation from –40°C to 150°C junction temperature. This extended rating enables deployment in under-hood automotive environments and sealed industrial enclosures where ambient temperatures exceed 105°C. The device includes overtemperature protection that reduces LED current above the programmed TSET threshold to prevent thermal runaway.
Does LT3964RUHE-1#PBF support synchronization with an external clock source?
Yes, LT3964RUHE-1#PBF supports external clock synchronization via the SYNC/CLKOUT pin. When driven with a 50% duty-cycle logic-level signal, the internal oscillator locks to the external frequency - provided the RT resistor is set for an internal frequency ~10% slower than the sync signal. This capability enables EMI reduction and multi-driver phase alignment in large-scale lighting systems.
How does LT3964RUHE-1#PBF report OPENLED faults?
LT3964RUHE-1#PBF reports OPENLED faults when FB voltage exceeds 1.127V (falling threshold) and V(ISP–ISN) drops below 10mV - indicating loss of LED string continuity. This condition sets the OPENLED bit in the I²C status register and pulls the open-drain ALERT pin low. The fault remains latched until cleared via I²C command or power cycle.
Can LT3964RUHE-1#PBF operate in constant-voltage mode?
Yes, LT3964RUHE-1#PBF supports constant-voltage regulation via the FB1/FB2 pins, which are regulated to 1.18V nominal. In this mode, the IC maintains a fixed output voltage across the LED string while still providing overvoltage (OVFB), short-circuit (SHORTLED), and thermal protection - useful for driving non-LED loads such as laser diodes or bias networks.
What is the purpose of the TSET pin on LT3964RUHE-1#PBF?
The TSET pin on LT3964RUHE-1#PBF programs the junction temperature threshold at which LED current begins to fold back linearly. An internal PTAT voltage is compared to the TSET voltage; when exceeded, the current sense threshold scales down proportionally - protecting LEDs and the IC from thermal degradation. If unused, TSET should be tied to INTVCC.
LT3964RUHE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 2A
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- Analog, 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)
LT3964RUHE-1#PBF FAQ
1.How can I place an order for LT3964RUHE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3964RUHE-1#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 LT3964RUHE-1#PBF reliable?
The price and inventory of LT3964RUHE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3964RUHE-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3964RUHE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3964RUHE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3964RUHE-1#PBF?
LT3964RUHE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3964RUHE-1#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 LT3964RUHE-1#PBF?
For technical support, including LT3964RUHE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3964RUHE-1#PBF requirements.
6.How does Aetrix verify that LT3964RUHE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3964RUHE-1#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 LT3964RUHE-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3964RUHE-1#PBF?
All LT3964RUHE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3964RUHE-1#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 LT3964RUHE-1#PBF part is unused and in its original packaging.
Return procedure for LT3964RUHE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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