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Analog Devices Inc. LT3964RUHE-1#TRPBF
- Part No.:
- LT3964RUHE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 36-WFQFN Exposed Pad
- Datasheet:
-
LT3964RUHE-1#TRPBF.pdf
- Description:
- IC LED DRVR CTRLR PWM 1.6A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,583
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Product details
Overview
LT3964RUHE-1#TRPBF from Analog Devices is a dual-channel synchronous buck LED driver IC with I²C interface, designed for constant-current and constant-voltage LED regulation. It delivers up to 2A per channel across 4V–36V input, supports 8192:1 true-color PWM dimming via I²C, and features ±3% current regulation accuracy-used in high-reliability automotive headlight modules and medical surgical lighting systems.
For engineers reviewing the LT3964RUHE-1#TRPBF datasheet, LT3964RUHE-1#TRPBF pinout, LT3964RUHE-1#TRPBF application, or LT3964RUHE-1#TRPBF equivalent, key selection considerations include its dual 2A/40V synchronous buck architecture, programmable I²C fault reporting (OPENLED/SHORTLED/OVFB), thermal foldback via TSET pin, and 5mm × 6mm 36-pin QFN package with exposed PGND pad.
Technical Context
The LT3964RUHE-1#TRPBF integrates two independent peak-current-mode synchronous buck regulators with internal 200mΩ top / 180mΩ bottom MOSFETs, each supporting adjustable switching frequency (200kHz–2MHz) via RT resistor and external clock synchronization. Its ground-referenced FB pins enable dual-mode operation: constant-current regulation via ISP–ISN sensing or constant-voltage regulation with OPENLED/SHORTLED protection thresholds.
I²C communication (400kHz compliant) provides full register access for real-time fault status reading, 8-bit ADIM dimming control, PWM/analog dimming mixing, and device address configuration (9 unique addresses). The CTRL1/CTRL2 pins modulate current sense threshold linearly (0.2V–1.1V) or digitally (via ADIM), enabling combined analog dimming and temperature foldback.
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 stable thermal performance. |
| I²C Dimming Ratio | 8192:1 - achieves ultra-fine brightness control for color-critical applications like surgical lighting. |
| Current Regulation Accuracy | ±3% - ensures consistent luminance across LED bins and temperature variations. |
| Switching Frequency Range | 200kHz to 2MHz - allows optimization for EMI (low freq) or compact size (high freq with small inductors). |
| 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. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and sterilizable medical environments. |
Pinout & Package
LT3964RUHE-1#TRPBF is housed in a 36-pin plastic QFN (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 (Pins 19, 28) | Positive current sense input | Connects to high-side of LED string current-sense resistor; supplies gate drive voltage for external PMOS disconnect switch. |
| ISN1/ISN2 (Pins 20, 27) | Negative current sense input | Completes current sense path; referenced to SGND; bias current <30nA enables high-accuracy low-value RSENSE. |
| PWMTG1/PWMTG2 (Pins 21, 26) | PMOS gate driver output | Level-shifted inverted PWM signal (0V to ISP–7.5V) for load-side LED disconnect and external PWM dimming control. |
| FB1/FB2 (Pins 23, 24) | Voltage feedback input | Regulated to 1.18V nominal; triggers OPENLED (VFB > 1.127V + V(ISP–ISN) <10mV) and SHORTLED (VFB < 0.25V) faults. |
| CTRL1/CTRL2 (Pins 2, 3) | Analog dimming/foldback control | Linearly scales current sense threshold from 7mV to 103mV; enables temperature-dependent current reduction when tied to TSET. |
| SDA/SCL (Pins 9, 10) | I²C bidirectional data/clock | Open-drain, 400kHz-compliant interface for reading fault registers, writing ADIM[7:0], and configuring CONFIG bits. |
| ADDR1/ADDR2 (Pins 12, 11) | I²C address select | Three-state (LOW/HIGH/FLOAT) pins configure 9 unique I²C addresses - avoids bus conflicts in multi-driver systems. |
| TSET (Pin 35) | Junction temperature setpoint | Threshold for thermal foldback; internal VPTAT comparator reduces LED current above programmed junction temp. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2A synchronous bucks | Enables separate dimming, fault reporting, and thermal management per LED channel - critical for asymmetric lighting arrays. |
| I²C-programmable 8192:1 True Color PWM™ | Preserves LED chromaticity across full dimming range by avoiding low-frequency PWM artifacts that cause color shift. |
| Programmable OPENLED/SHORTLED protection with ALERT assertion | Single open-collector ALERT pin reports six fault types (OVFB, OPENLED, SHORTLED, OC, INTVCC UVLO, thermal shutdown) - simplifies system-level monitoring. |
| Adjustable frequency & SYNC/CLKOUT | RT resistor sets 200kHz–2MHz switching; SYNC/CLKOUT accepts external clock or outputs buffered clock - eliminates beat frequencies in multi-driver systems. |
| Thermal foldback via TSET pin | Reduces LED current before reaching 150°C junction limit - extends lifetime in sealed enclosures without active cooling. |
| Internal compensation & rail-to-rail current sense amplifier | Eliminates external compensation components; supports 0–100mV sense range with 10mV resolution - enables use of low-value, low-power RSENSE. |
Applications
| Automotive Adaptive Front Lighting (AFS) | Medical Surgical Headlights |
|---|---|
Use Scenario: High-intensity LED matrix headlights with dynamic beam shaping and glare-free illumination. IC Role / Device Role / Timing Role: Dual-channel constant-current driver controlling individual LED zones; I²C enables real-time zone enable/disable and fault isolation. Use Value: ±3% current matching ensures uniform luminance across 16+ LED zones; 8192:1 dimming enables smooth transition between low-beam and high-beam profiles. |
Use Scenario: Sterilizable, high-CRI LED surgical lights requiring flicker-free, color-stable illumination at variable intensities. IC Role / Device Role / Timing Role: Constant-current source with thermal foldback and OPENLED detection for redundant LED strings in critical lighting paths. Use Value: TSET-driven thermal derating maintains safe operating temperature during prolonged use; I²C fault reporting enables predictive maintenance alerts. |
| Industrial Machine Vision Lighting | Architectural LED Accent Lighting |
Use Scenario: Stroboscopic LED arrays synchronized to camera exposure for high-speed inspection systems. IC Role / Device Role / Timing Role: Synchronized dual buck regulator triggered by external clock via SYNC/CLKOUT pin; PWMTG drives external PMOS for precise LED on/off timing. Use Value: Minimum on-time of 20ns enables sub-microsecond LED strobing; 2MHz max frequency supports tight timing budgets in vision systems. |
Use Scenario: Multi-zone architectural lighting with independent dimming, color tuning, and fault resilience. IC Role / Device Role / Timing Role: Dual-channel driver powering RGBW LED strings; I²C ADIM registers allow per-channel digital dimming calibration. Use Value: 9 configurable I²C addresses support up to 9 LT3964RUHE-1#TRPBF devices on one bus - scalable for large installations without address conflicts. |
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 | Higher 3A per channel rating; adds spread-spectrum frequency modulation; same pinout and I²C register map. | Better suited for higher-power LED arrays (>2A/channel); identical software integration but requires larger thermal layout. | Select when >2A/channel output or EMI-sensitive environments require spread-spectrum operation. |
| TPS92692QPWPRQ1 | Automotive-qualified dual buck; 2.5A/channel; analog/digital dimming; no I²C - uses PWM/DIR/EN interface only. | Lacks I²C fault reporting and ADIM register control; relies on external MCU for fault interpretation and dimming sequencing. | Select for cost-sensitive automotive designs where I²C bus overhead is undesirable and discrete fault handling is acceptable. |
Compared with LT3965EUHE#TRPBF, LT3964RUHE-1#TRPBF offers lower thermal footprint and reduced BOM cost for ≤2A applications; versus TPS92692QPWPRQ1, it provides richer diagnostics and finer dimming resolution via integrated I²C, at the expense of interface complexity.
Availability
LT3964RUHE-1#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, medical equipment, and industrial machine vision applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LT3964RUHE-1#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 precision instrumentation, industrial automation, and automotive safety markets.
The LT3964RUHE-1#TRPBF belongs to Analog Devices' Power by Linear™ LED driver family, engineered for high-efficiency, thermally robust, and digitally controllable LED systems in safety-critical and high-reliability applications.
FAQ
What is the maximum LED string voltage supported by LT3964RUHE-1#TRPBF?
The LT3964RUHE-1#TRPBF supports up to 40V output per channel, verified by its 40V absolute maximum rating on ISP/ISN pins and 2A continuous output capability. This enables driving typical 8-LED white LED strings (26V forward voltage) with margin for thermal drift and line regulation. Operation beyond 40V risks permanent damage to internal switches and sense circuitry.
Does LT3964RUHE-1#TRPBF support both constant-current and constant-voltage modes?
Yes, LT3964RUHE-1#TRPBF supports dual-mode operation: constant-current mode uses ISP–ISN sensing with ±3% regulation accuracy, while constant-voltage mode regulates FB1/FB2 to 1.18V nominal. In CV mode, the IC also enforces OPENLED (VFB > 1.127V + low sense voltage) and SHORTLED (VFB < 0.25V) protections - essential for LED string health monitoring.
How does the TSET pin function in LT3964RUHE-1#TRPBF?
The TSET pin in LT3964RUHE-1#TRPBF sets the junction temperature threshold for automatic LED current foldback. An internal proportional-to-absolute-temperature (VPTAT) voltage is compared to the TSET voltage; when VPTAT exceeds TSET, the IC reduces LED current to prevent thermal runaway. If unused, TSET must be tied to INTVCC (4V) to disable foldback.
Can LT3964RUHE-1#TRPBF drive external PMOS transistors for LED disconnect?
Yes, LT3964RUHE-1#TRPBF provides dedicated PWMTG1 and PWMTG2 pins that deliver level-shifted, inverted gate drive signals (0V to ISP–7.5V) to control external high-side PMOS transistors. This enables load-side LED disconnect, external PWM dimming, and fault-mode isolation - confirmed by the datasheet's "P-Channel MOSFET Switch Driver" feature and PWMTG timing specifications.
What I²C address options are available for LT3964RUHE-1#TRPBF?
LT3964RUHE-1#TRPBF supports 9 unique I²C addresses via ADDR1 and ADDR2 pins, each configurable as LOW, HIGH, or FLOAT (high-impedance). This three-state addressing enables up to 9 devices on a single I²C bus without address collision - validated in the Electrical Characteristics table (Note 6) and Pin Functions section.
LT3964RUHE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3964RUHE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3964RUHE-1#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 LT3964RUHE-1#TRPBF reliable?
The price and inventory of LT3964RUHE-1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3964RUHE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3964RUHE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3964RUHE-1#TRPBF?
LT3964RUHE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3964RUHE-1#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 LT3964RUHE-1#TRPBF?
For technical support, including LT3964RUHE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3964RUHE-1#TRPBF requirements.
6.How does Aetrix verify that LT3964RUHE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3964RUHE-1#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 LT3964RUHE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3964RUHE-1#TRPBF?
All LT3964RUHE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3964RUHE-1#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 LT3964RUHE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3964RUHE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3964RUHE-1#TRPBF Tags
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