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Analog Devices Inc. LT3797IUKG#TRPBF
- Part No.:
- LT3797IUKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 47 Leads, Exposed Pad
- Datasheet:
-
LT3797IUKG#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,825
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Product details
Overview
LT3797IUKG#TRPBF from Analog Devices is a triple-output DC/DC LED controller IC designed for independent high-side current sensing and flexible topology support (boost, buck, buck-boost, SEPIC, flyback). It operates from 2.5V to 40V input, delivers 3000:1 PWM dimming, integrates a 7.5V INTVCC supply, and supports rail-to-rail LED current sense (0V–100V) in automotive and large-display lighting systems.
For engineers reviewing the LT3797IUKG#TRPBF datasheet, LT3797IUKG#TRPBF pinout, LT3797IUKG#TRPBF application, or LT3797IUKG#TRPBF equivalent, key selection considerations include its triple-channel independent fault reporting (FLT1–3), programmable analog dimming via CTRL1–3, high-side ISP/ISN sensing capability, and 52-lead 7mm × 8mm QFN package with exposed GND pad.
Technical Context
The LT3797IUKG#TRPBF implements fixed-frequency current-mode control per channel with shared oscillator and integrated 7.5V INTVCC power supply. Each channel features independent VC error amplifier compensation, FBH-referred voltage loop, and high-side current sense architecture enabling topology flexibility without external level-shifting.
Its dual-loop regulation-current sense (ISP–ISN) referenced to CTRL pins and voltage feedback (|ISP–FBH|) referenced to 1.25V-enables coordinated open-LED protection and overvoltage shutdown. Fault flags (FLT1–3) report channel-specific conditions including VIN overvoltage (>41V), thermal shutdown (>165°C), INTVCC undervoltage (<5.2V), and LED overcurrent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 40V continuous; withstands 60V transients - enables direct battery connection in 12V/24V automotive and industrial systems. |
| LED Current Sense Range | Rail-to-rail 0V to 100V common-mode - supports high-side sensing across full LED string voltage range without shunt relocation. |
| PWM Dimming Ratio | 3000:1 - achieves deep dimming in architectural and stage lighting without visible flicker or color shift. |
| Switching Frequency | 100kHz to 1MHz, adjustable via RT resistor or synchronizable to external clock - allows EMI optimization and inductor size reduction. |
| INTVCC Output | 7.5V ±0.35V regulated supply - powers all three N-channel gate drivers directly, eliminating need for external bias supply. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
| Fault Reporting | Three independent open-collector FLT pins - enable discrete channel-level diagnostics and system-level fault isolation without software polling. |
Pinout & Package
LT3797IUKG#TRPBF is housed in a 52-lead 7mm × 8mm plastic QFN package (UKG) with exposed thermal pad (Pin 53) soldered to PCB ground for thermal management (θJA = 28°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FLT1–3 (Pins 1–3) | Open-collector fault output | Asserts low for channel-specific faults: VIN >41V, thermal shutdown, INTVCC <5.2V, open LED, or overcurrent - enables hardware-triggered system response. |
| PWM1–3 (Pins 4–6) | Digital dimming enable input | Drives respective channel into idle mode (no switching, TG high, VC high-Z) when pulled low - supports synchronized multi-channel blanking. |
| CTRL1–3 (Pins 8–10) | Analog dimming threshold control | Sets LED current sense threshold from 0mV to 250mV linearly (0.2V–1.2V range) - enables precise analog brightness control and temperature compensation. |
| ISP1–3 / ISN1–3 (Pins 15–17, 31–32, 36–37) | High-side current sense inputs | Accept Kelvin-connected sense resistor between LED string anode and switch - eliminates ground loop errors and supports floating-string topologies. |
| FBH1–3 (Pins 17, 30, 38) | Voltage loop reference input | Defines |ISP–FBH| = 1.25V regulation point - enables open-LED detection and overvoltage protection by monitoring LED string voltage collapse or surge. |
| TG1–3 (Pins 14, 33, 35) | P-channel MOSFET gate driver output | Level-shifts PWM signal to drive external PMOS disconnect switch between ISP and (ISP – 6.5V) - provides active LED string disconnection during fault or dimming. |
| GATE1–3 (Pins 23, 24, 44) | N-channel MOSFET gate driver output | Drives external NMOS switch between INTVCC and GND - delivers fast rise/fall times (25ns) and rail-to-rail swing for efficient switching. |
| INTVCC (Pins 45–46) | Integrated 7.5V supply output | Powers internal logic and all three GATE drivers - bypassed with 10µF ceramic capacitor; two parallel pins reduce impedance and improve stability. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent boost/buck/buck-boost control | Each channel configurable for optimal topology per LED string voltage/current requirements - avoids single-point failure and enables mixed-voltage arrays. |
| High-side current sensing (ISP/ISN) | Eliminates need for low-side shunt and associated ground contamination - preserves system ground integrity in sensitive analog or communication subsystems. |
| Programmable soft-start (SS1–3) | External capacitor sets individual channel ramp time - prevents inrush current in multi-string arrays and enables staggered startup sequencing. |
| Independent fault flag outputs (FLT1–3) | Hardware-level per-channel fault signaling - reduces firmware overhead and enables real-time safety-critical responses without processor intervention. |
| Integrated 7.5V INTVCC supply | Self-powered gate drivers eliminate external bias rails - simplifies BOM, improves efficiency, and ensures gate drive remains stable across wide VIN range. |
Applications
| Automotive Headlamp Systems | RGB Stage Lighting |
|---|---|
Use Scenario: Adaptive driving beam (ADB) headlamps requiring independent control of multiple LED segments for dynamic light patterning. IC Role / Device Role / Timing Role: Triple-output LED controller managing separate high-beam, low-beam, and cornering LED strings with synchronized PWM dimming and open-circuit detection. Use Value: Enables pixel-level beam shaping via per-string current regulation and fault-isolated operation - meets ISO 11270 functional safety requirements for lamp redundancy. | Use Scenario: High-power theatrical fixtures with independently dimmable red, green, and blue LED channels for precise color mixing. IC Role / Device Role / Timing Role: Synchronized triple-channel current controller delivering 3000:1 dimming depth and fast PWM response across all color channels. Use Value: Eliminates color shift at low intensity by maintaining consistent current regulation per channel - critical for DMX512-controlled professional lighting. |
| Billboard LED Video Walls | Industrial Machine Vision Lighting |
Use Scenario: Outdoor digital signage with thousands of RGB pixels requiring uniform brightness and long-term reliability under thermal stress. IC Role / Device Role / Timing Role: High-efficiency triple-output controller driving grouped LED strings with rail-to-rail 0V–100V sensing and thermal derating via CTRL pin interface. Use Value: Maintains luminance consistency across wide ambient temperature range (–40°C to +125°C) using on-chip temperature-compensated current thresholds. | Use Scenario: High-speed inspection systems needing strobed LED illumination synchronized to camera exposure timing. IC Role / Device Role / Timing Role: Precision PWM dimming controller with sub-microsecond gate driver timing and external SYNC input for camera-triggered flash control. Use Value: Achieves <1µs jitter between SYNC edge and GATE transition - enables repeatable, motion-blur-free imaging at >10k fps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Single-output synchronous boost controller; no integrated INTVCC; requires external gate drivers and bias supply. | Limited to single-string designs; lacks per-channel fault flags and high-side sensing. | Select only for cost-sensitive single-string applications where board space permits external components. |
| MAX16833ATP+T | Dual-output LED controller; supports only boost topology; no FBH-based open-LED protection; 40-pin TQFN package. | Not suitable for triple-string or mixed-topology systems; lower integration reduces design flexibility. | Consider only when dual-channel operation suffices and thermal performance requirements are less stringent. |
Compared with LTC3783EFE#PBF and MAX16833ATP+T, the LT3797IUKG#TRPBF provides true triple-channel independence, integrated 7.5V bias, high-side sensing, and comprehensive fault reporting - making it uniquely suited for mission-critical multi-string lighting where reliability, topology flexibility, and diagnostic granularity are required.
Availability
LT3797IUKG#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, RGB stage lighting, outdoor video walls, and industrial machine vision systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3797IUKG#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LT3797 product line was developed specifically for high-reliability, multi-string LED lighting applications demanding independent channel control, robust fault handling, and wide-input-voltage operation in harsh environments.
FAQ
What is the maximum input voltage transient rating for the LT3797IUKG#TRPBF?
The LT3797IUKG#TRPBF supports input voltage transients up to 60V while maintaining functionality, with internal overvoltage lockout triggering at 41V typical. This allows direct connection to 12V or 24V automotive batteries without external transient suppression in many cases, though sustained operation above 40V requires careful thermal design and layout.
How does the LT3797IUKG#TRPBF implement open-LED protection?
The LT3797IUKG#TRPBF uses FBH pins to monitor |ISP–FBH| voltage. When an open-LED event causes ISP to collapse toward GND, the |ISP–FBH| voltage drops below the 1.25V regulation threshold, triggering the error amplifier to drive TG high and disconnect the LED string via external PMOS. Simultaneously, FLTx asserts low to signal the fault condition.
Can the LT3797IUKG#TRPBF operate in buck mode for all three channels?
Yes, the LT3797IUKG#TRPBF supports buck, boost, buck-boost, SEPIC, and flyback topologies per channel. For buck operation, connect the LED string between VIN and the switch node (SW1/SW2), configure ISP/ISN across the low-side sense resistor, and tie FBH to GND - enabling efficient step-down regulation for low-voltage LED arrays.
What is the purpose of the CTRL1–3 pins on the LT3797IUKG#TRPBF?
The CTRL1–3 pins on the LT3797IUKG#TRPBF set the LED current sense threshold voltage (VISP–ISN) linearly from 0mV to 250mV over 0.2V–1.2V input range. This enables analog dimming, temperature compensation (by feeding back thermistor voltage), and dynamic current scaling - all without modifying hardware or firmware.
Does the LT3797IUKG#TRPBF require external components for its INTVCC supply?
No, the LT3797IUKG#TRPBF integrates a DC/DC converter that generates a regulated 7.5V INTVCC supply from VIN. Only external passive components are required: a 0.1µF BOOST capacitor between BOOST and SW1, a 10µF ceramic capacitor on each INTVCC pin, and an inductor for the integrated power supply - eliminating need for external bias rails.
LT3797IUKG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 47 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (7x8)
LT3797IUKG#TRPBF FAQ
1.How can I place an order for LT3797IUKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3797IUKG#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 LT3797IUKG#TRPBF reliable?
The price and inventory of LT3797IUKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3797IUKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3797IUKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3797IUKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3797IUKG#TRPBF?
LT3797IUKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3797IUKG#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 LT3797IUKG#TRPBF?
For technical support, including LT3797IUKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3797IUKG#TRPBF requirements.
6.How does Aetrix verify that LT3797IUKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3797IUKG#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 LT3797IUKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3797IUKG#TRPBF?
All LT3797IUKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3797IUKG#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 LT3797IUKG#TRPBF part is unused and in its original packaging.
Return procedure for LT3797IUKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3797IUKG#TRPBF Tags
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