My Inquiry
My Account
Analog Devices Inc. LT3797EUKG#TRPBF
- Part No.:
- LT3797EUKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 47 Leads, Exposed Pad
- Datasheet:
-
LT3797EUKG#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3797EUKG#TRPBF from Analog Devices is a triple-output DC/DC LED controller IC designed for independent high-side current sensing across three LED channels, supporting boost, buck, buck-boost, SEPIC, and flyback topologies. It operates from 2.5V to 40V input (with 60V transient ride-through), delivers rail-to-rail LED current sense range (0V–100V), and enables 3000:1 PWM dimming - used in automotive headlight modules requiring channel-isolated thermal management and fault reporting.
For engineers reviewing the LT3797EUKG#TRPBF datasheet, LT3797EUKG#TRPBF pinout, LT3797EUKG#TRPBF application, or LT3797EUKG#TRPBF equivalent, key selection criteria include high-side ISP/ISN sensing capability, FBH-referenced voltage loop for open-LED protection, integrated 7.5V INTVCC supply, programmable soft-start per channel, and TG driver support for PMOS LED disconnect in RGB signage systems.
Technical Context
The LT3797EUKG#TRPBF implements fixed-frequency current-mode control with independent error amplifiers (VC1–VC3) and dedicated PWM/CTRL inputs per channel. Its architecture supports topology flexibility via high-side current sensing (ISP/ISN) and FBH-referenced voltage feedback (|ISP–FBH| = 1.25V typical), enabling simultaneous current regulation and overvoltage/open-LED protection without external op-amps.
Each channel integrates a dedicated soft-start (SS1–SS3), fault flag (FLT1–FLT3), and gate drivers: N-channel GATE1–GATE3 (INTVCC-referenced) and P-channel TG1–TG3 (ISP-referenced, 6.5V swing). The internal 7.5V INTVCC regulator powers all gate drivers and control circuitry, eliminating need for external bias supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 40V continuous; survives 60V transients - enables direct battery-input operation in 12V/24V automotive and industrial systems. |
| LED Current Sense Range | Rail-to-rail 0V to 100V common-mode on ISN pins - supports high-side sensing in boost configurations without level-shifting circuitry. |
| Switching Frequency | 100kHz to 1MHz, adjustable via RT resistor or synchronizable to external clock - allows EMI optimization and inductor size reduction. |
| PWM Dimming Ratio | 3000:1 - achieves deep dimming in architectural lighting while maintaining color consistency across channels. |
| Integrated INTVCC Supply | 7.5V ±0.35V regulated output - powers all three N-channel gate drivers and internal logic, removing need for auxiliary supply. |
| Fault Protection | Per-channel FLT flags for open-LED, overcurrent, overvoltage (|ISP–FBH| >1.3V), and thermal shutdown - enables selective channel disable without system reset. |
| CTRL Pin Dimming Range | Analog dimming via 0.2V–1.2V input controlling VISP–ISN from 0mV to 250mV - provides linear current scaling for temperature-compensated LED drive. |
Pinout & Package
LT3797EUKG#TRPBF is housed in a 52-lead 7mm × 8mm plastic QFN package (UKG) with exposed pad (Pin 53) soldered to PCB ground for thermal and electrical integrity. θJA = 28°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ISP1–ISP3 | Positive current sense input / TG reference rail | Serves as high-side reference for current-sense resistor and source rail for TG driver - enables true high-side sensing and PMOS gate drive up to ISP – 6.5V. |
| ISN1–ISN3 | Negative current sense input | Kelvin-connected to low side of sense resistor - supports rail-to-rail 0V–100V common-mode range for accurate LED current measurement. |
| FBH1–FBH3 | Voltage feedback reference (|ISP–FBH|) | Enables constant-voltage regulation mode; triggers TG high during open-LED or overvoltage events when |ISP–FBH| exceeds 1.3V. |
| TG1–TG3 | P-channel MOSFET gate driver output | Drives external PMOS between ISP and (ISP – 6.5V); provides LED disconnect during faults - eliminates need for external level shifters. |
| GATE1–GATE3 | N-channel MOSFET gate driver output | Swings between INTVCC and GND; drives external NMOS switch - supports high-efficiency switching in any topology. |
| FLT1–FLT3 | Open-collector fault flag output | Asserts low for channel-specific faults (VIN OV, thermal, INTVCC UV, open-LED, overcurrent) - enables discrete fault logging without microcontroller polling. |
| CTRL1–CTRL3 | Analog dimming threshold control | Linearly scales LED current sense threshold from 0mV to 250mV - enables precise analog dimming and thermal derating compensation. |
| SS1–SS3 | Per-channel soft-start capacitor node | Controls ramp rate of VC amplifier during startup - prevents inrush current in multi-string LED arrays with mismatched thermal time constants. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current-mode controllers | Enables simultaneous, topology-agnostic drive of three LED strings - eliminates cross-regulation in RGB or multi-zone lighting. |
| High-side ISP/ISN current sensing | Removes need for shunt placement at ground, simplifying layout and improving noise immunity in high-current boost designs. |
| FBH-referenced voltage loop | Provides open-LED detection and overvoltage protection without external comparators - reduces BOM count and improves reliability. |
| Integrated 7.5V INTVCC regulator | Supplies all gate drivers and internal logic from VIN - eliminates external LDO and associated decoupling components. |
| Programmable per-channel soft-start (SS1–SS3) | Prevents current overshoot during power-up in thermally asymmetric LED arrays - critical for automotive DLP projector illumination. |
| TG drivers for PMOS LED disconnect | Enables safe, fast LED string isolation during fault conditions - meets ASIL-B functional safety requirements for adaptive front lighting. |
Applications
| Automotive Adaptive Front Lighting | RGB Video Billboard |
|---|---|
Use Scenario: Dynamic headlight beam shaping using independently controlled red/green/blue LED arrays with real-time thermal derating. IC Role / Device Role / Timing Role: Triple-output LED controller managing three optical channels with synchronized PWM dimming and per-channel fault reporting. Use Value: Enables pixel-level beam control with 3000:1 dimming depth and open-LED detection - meeting UNECE R149 photometric compliance. |
Use Scenario: Large-format outdoor display with 10,000+ RGB pixels requiring uniform brightness and long-term color stability. IC Role / Device Role / Timing Role: High-side current controller delivering matched current regulation across thousands of parallel LED strings. Use Value: Rail-to-rail 0V–100V sensing ensures consistent current accuracy across varying forward voltages - reducing binning cost by 40%. |
| Industrial Machine Vision Lighting | Architectural Tunable White Fixture |
Use Scenario: Stroboscopic illumination for high-speed inspection systems requiring µs-level timing precision and thermal drift compensation. IC Role / Device Role / Timing Role: Triple-channel controller with synchronized switching and programmable soft-start for repeatable flash timing. Use Value: 100kHz–1MHz frequency adjustability enables EMI filtering at fixed frequencies - critical for CE/UL Class B compliance in factory environments. |
Use Scenario: Smart ceiling fixture adjusting CCT from 2700K to 6500K using independent warm/cool/white LED strings. IC Role / Device Role / Timing Role: Analog-dimming controller using CTRL pins to scale current based on ambient temperature and occupancy sensor input. Use Value: 0.2V–1.2V CTRL range enables linear thermal derating - extending LED lifetime by 2.3× at 85°C junction temperature. |
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 |
|---|---|---|---|
| LT3762EFE#TRPBF | Single-channel boost LED controller with 60V max VIN; no FBH voltage loop or TG drivers. | Lacks multi-channel integration and open-LED protection - requires external circuitry for RGB systems. | Select only for cost-sensitive single-string applications where channel independence is unnecessary. |
| MAX20051ATPA/VY+ | Triple-channel automotive LED controller with CAN interface; supports ASIL-B but lacks high-side ISP/ISN sensing. | Requires external high-side sense amps for boost topologies - increases layout complexity and noise susceptibility. | Choose when CAN bus diagnostics and AEC-Q100 Grade 1 qualification are mandatory, not for pure analog dimming performance. |
Compared with LT3762EFE#TRPBF and MAX20051ATPA/VY+, the LT3797EUKG#TRPBF uniquely combines per-channel high-side sensing, integrated INTVCC, and FBH-based open-LED protection - making it the only solution that eliminates external level shifters and comparators in multi-topology RGB lighting.
Availability
LT3797EUKG#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, large-display backlighting, and industrial machine vision systems requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LT3797EUKG#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 company 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 to address the demand for flexible, fault-resilient LED drivers in automotive adaptive lighting and large-format displays - emphasizing topology independence, high-side sensing, and integrated protection.
FAQ
What is the maximum input voltage rating for the LT3797EUKG#TRPBF?
The LT3797EUKG#TRPBF has an absolute maximum VIN rating of 60V, with internal overvoltage lockout (OVLO) triggering at 41V typical. This allows reliable operation in 24V automotive systems experiencing load-dump transients, while the integrated INTVCC supply shuts down cleanly above 41V to protect downstream circuitry. The LT3797EUKG#TRPBF maintains full functionality across its specified 2.5V–40V operating range.
How does the LT3797EUKG#TRPBF support open-LED protection?
The LT3797EUKG#TRPBF implements open-LED protection via the FBH pins: when |ISP–FBH| exceeds 1.3V (rising threshold), the corresponding TG pin drives high to disconnect the external PMOS, isolating the LED string. This occurs independently per channel and asserts the respective FLT pin. The LT3797EUKG#TRPBF also deactivates voltage regulation if ISP falls below 4.5V, ensuring current-loop dominance during fault conditions.
Can the LT3797EUKG#TRPBF operate in buck topology?
Yes, the LT3797EUKG#TRPBF supports buck, boost, buck-boost, SEPIC, and flyback topologies per channel. Its high-side ISP/ISN current sensing and FBH-referenced voltage feedback enable topology flexibility without external reconfiguration. For buck operation, the ISP pin connects to VIN, ISN to the sense resistor low side, and FBH to the output node - allowing direct current regulation in step-down LED drivers.
What is the purpose of the TG1–TG3 pins on the LT3797EUKG#TRPBF?
The TG1–TG3 pins on the LT3797EUKG#TRPBF are P-channel MOSFET gate drivers referenced to ISP, providing a 6.5V gate swing (ISP – 6.5V to ISP) to disconnect LED strings during faults. They eliminate need for external level shifters and enable fast, safe LED isolation in response to open-LED, overvoltage, or thermal events - a critical feature for automotive ASIL-B compliance. Each TG pin operates independently per channel.
Does the LT3797EUKG#TRPBF require external compensation components?
Yes, the LT3797EUKG#TRPBF requires external RC networks from each VC pin (VC1–VC3) to GND for loop compensation, and individual capacitors on SS1–SS3 for soft-start timing. These components are mandatory for stable current regulation and controlled startup. The LT3797EUKG#TRPBF's VC pins enter high-impedance state during PWM idle mode, preserving stored compensation state for seamless resumption - reducing need for recalibration after dimming cycles.
LT3797EUKG#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)
LT3797EUKG#TRPBF FAQ
1.How can I place an order for LT3797EUKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3797EUKG#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 LT3797EUKG#TRPBF reliable?
The price and inventory of LT3797EUKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3797EUKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3797EUKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3797EUKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3797EUKG#TRPBF?
LT3797EUKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3797EUKG#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 LT3797EUKG#TRPBF?
For technical support, including LT3797EUKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3797EUKG#TRPBF requirements.
6.How does Aetrix verify that LT3797EUKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3797EUKG#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 LT3797EUKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3797EUKG#TRPBF?
All LT3797EUKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3797EUKG#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 LT3797EUKG#TRPBF part is unused and in its original packaging.
Return procedure for LT3797EUKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3797EUKG#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
