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Analog Devices Inc. LT3597EUHG#TRPBF
- Part No.:
- LT3597EUHG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3597EUHG#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,160
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Product details
Overview
LT3597EUHG#TRPBF from Analog Devices (formerly Linear Technology) is a 60V triple step-down LED driver IC with three independent 100mA constant-current sinks, adaptive VOUT control, and 10,000:1 True Color PWM dimming at 100Hz. It integrates fast NPN current sources for sub-1µs pulse widths and supports RGB single-pixel LED driving in large-format displays.
For engineers reviewing the LT3597EUHG#TRPBF datasheet, LT3597EUHG#TRPBF pinout, LT3597EUHG#TRPBF application, or LT3597EUHG#TRPBF equivalent, key selection criteria include ±2% inter-channel LED current matching, programmable thermal derating via TSET/CTRLM, 200kHz–1MHz switching frequency setting via RT resistor, and open/shorted LED fault reporting on FAULT pin.
Technical Context
The LT3597EUHG#TRPBF implements peak-current-mode-controlled buck regulators per channel, each feeding an open-collector NPN current sink. Its adaptive VOUT loop dynamically adjusts output voltage to maintain ~1V across each LED sink-minimizing power loss while enabling mismatched LED string lengths.
It features integrated fault detection (open LED >12V or shorted LED within 1.25V of VOUT), programmable thermal derating using an NTC-based voltage divider on CTRLM, and synchronized PWM dimming with 1µs minimum on-time. All three channels share a common reference (VREF = 2.0V) and support independent analog dimming via CTRL1–3 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive LED bus supplies without external pre-regulation. |
| Max LED Current per Channel | 100mA - set by external ISET resistor; matched to ±2% between channels for consistent RGB color balance. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables true-color dimming down to 0.01% duty cycle with 1µs pulse width, preserving chromaticity. |
| Switching Frequency Range | 200kHz to 1MHz - programmed via RT pin resistor; allows optimization of efficiency vs. EMI and inductor size. |
| Thermal Derating Threshold | Programmable via TSET pin - sets junction temperature limit (e.g., 85°C–115°C) using NTC-based voltage divider for LED-safe operation. |
| Fault Reporting | Open/shorted LED detection reported on open-drain FAULT pin - active-low signal indicates any channel fault during PWM high phase. |
| Package | 52-lead 5mm × 8mm QFN with exposed thermal pad - thermally enhanced for high-power LED driving up to 125°C junction temperature. |
Pinout & Package
LT3597EUHG#TRPBF is housed in a 52-lead plastic QFN (UHG package), 5mm × 8mm footprint, 0.6mm high-voltage pin spacing, with exposed thermal pad (Pin 53) soldered to PCB ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 50, 51) | Input supply input | Dual fused inputs accept 6–60V; requires local 10µF ceramic bypass to GND. |
| LED1–3 (Pins 20, 21, 24) | Constant-current sink output | Open-collector NPN outputs; each sinks up to 100mA with ±2% matching; connect LED cathodes here. |
| VOUT1–3 (Pins 19, 22, 23) | Buck regulator output sense | Feedback node for adaptive VOUT control; connects to LED anodes; rated to 42V max. |
| ISET1–3 (Pins 14, 15, 16) | LED current programming | Resistor-to-GND sets full-scale current (e.g., 20kΩ = 100mA); uses internal 1V reference. |
| PWM1–3 (Pins 30, 29, 28) | Digital dimming enable | Logic-high enables current sink; low disables sink and triggers adaptive high-VOUT mode for fast reactivation. |
| CTRL1–3 (Pins 33, 32, 31) | Analog dimming control | 0–1.0V linearly scales LED current; >1.0V clamps at full scale; tied to VREF if unused. |
| TSET (Pin 11) | Junction temperature threshold | NTC-based voltage divider sets thermal shutdown point (e.g., 0.54V = 85°C); protects IC and LEDs. |
| CTRLM (Pin 13) | Master thermal derating | Accepts NTC-derived voltage to linearly reduce all channel currents above programmed ambient temperature. |
| FAULT (Pin 25) | Fault status output | Open-drain output pulled high externally; goes low on open/shorted LED or thermal fault during active PWM. |
| GND / Exposed Pad (Pins 18, 53) | Power and signal ground | Common return for analog/digital circuits and buck converters; exposed pad must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT control | Maintains ~1V across each LED sink by dynamically adjusting buck output voltage-reducing conduction loss and enabling mixed-string-length designs. |
| True Color PWM™ dimming | 10,000:1 ratio at 100Hz with <1µs minimum pulse width-preserves LED spectral output and avoids color shift across dimming range. |
| ±2% LED current matching | Guaranteed inter-channel current accuracy over –40°C to 125°C-critical for RGB white-point stability in signage and displays. |
| Integrated open/short LED protection | Detects open LED (>12V at LEDx) or shorted LED (within 1.25V of VOUTx); reports via FAULT pin without external circuitry. |
| Programmable thermal management | Two-tier protection: TSET sets absolute junction limit; CTRLM enables LED-specific derating curves using NTC resistors placed near LED strings. |
Applications
| LED Billboards and Signboards | Mono, Multi, Full-Color LED Displays |
|---|---|
Use Scenario: Outdoor large-format signage requiring high brightness, long lifetime, and precise RGB color fidelity under variable ambient temperatures. IC Role / Device Role / Timing Role: Triple-channel constant-current LED driver with adaptive buck regulation and synchronized PWM dimming for pixel-level control. Use Value: Enables 10,000:1 dimming without color shift while maintaining ±2% current matching-ensuring uniform luminance and white-point stability across thousands of pixels. | Use Scenario: Indoor video walls and information kiosks needing flicker-free, high-contrast display with dynamic brightness adjustment. IC Role / Device Role / Timing Role: RGB pixel driver with independent analog (CTRLx) and digital (PWMx) dimming interfaces for flexible system-level brightness control. Use Value: Dual dimming modes allow smooth analog ramping for transitions and high-ratio PWM for static content-reducing visible artifacts and improving perceived image quality. |
| Large Screen Display LED Backlighting | Automotive, Industrial, and Medical Displays |
Use Scenario: Edge-lit or direct-lit LCD backlights for commercial monitors and digital signage where thermal management and efficiency are critical. IC Role / Device Role / Timing Role: High-efficiency triple buck controller with adaptive VOUT and thermal derating-optimizing power delivery across varying LED forward voltages. Use Value: Adaptive VOUT reduces power dissipation by up to 30% compared to fixed-output designs, lowering thermal stress and extending backlight lifetime. | Use Scenario: Human-machine interface (HMI) panels in vehicles, factory HMIs, and diagnostic equipment requiring reliable operation from –40°C to 125°C. IC Role / Device Role / Timing Role: Robust LED driver with programmable UVLO, fault reporting, and dual thermal protection (TSET + CTRLM) for safety-critical lighting. Use Value: Fault detection and thermal derating ensure continued safe operation even under extreme ambient conditions-meeting ASIL-B readiness requirements for non-safety-critical lighting functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Single-channel, 60V synchronous buck LED driver; no integrated current sink; requires external MOSFET and sense resistor. | Suitable for high-current single-string applications; lacks multi-channel integration and True Color PWM. | Select when designing custom high-efficiency single-string drivers with layout flexibility and higher peak current capability. |
| TPS92692QPWPRQ1 | Triple-channel, 65V LED driver with integrated 150mA current sinks; supports 10,000:1 PWM but uses different thermal regulation architecture (no CTRLM pin). | Automotive-qualified (AEC-Q100 Grade 1); includes built-in spread-spectrum and enhanced EMI control. | Select for automotive front-lighting or instrument clusters requiring AEC-Q100 compliance and tighter EMI specifications. |
Compared with LTC3783EFE#PBF and TPS92692QPWPRQ1, the LT3597EUHG#TRPBF uniquely combines triple 100mA current sinks, adaptive VOUT, True Color PWM™, and dual thermal derating (TSET + CTRLM) in a single 52-lead QFN-making it optimal for space-constrained, high-fidelity RGB signage and display applications.
Availability
LT3597EUHG#TRPBF is available at Aetrix Electronics and suitable for LED billboards, full-color displays, and automotive HMIs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3597EUHG#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3597EUHG#TRPBF belongs to Linear's high-voltage LED driver product line, designed specifically for energy-efficient, thermally robust RGB pixel driving in large-format signage and professional displays.
FAQ
What is the maximum LED string voltage supported by the LT3597EUHG#TRPBF?
The LT3597EUHG#TRPBF supports up to 42V at the LED1–3 pins and VOUT1–3 pins. This allows driving typical RGB LED strings (e.g., 10× white LEDs @ 3.5V each = 35V) while maintaining margin for forward voltage variation and thermal drift. The internal buck regulators operate up to 60V input, ensuring headroom for system-level supply variations.
How does the LT3597EUHG#TRPBF achieve 10,000:1 PWM dimming without color shift?
The LT3597EUHG#TRPBF achieves 10,000:1 True Color PWM™ dimming by combining fast NPN current sinks (<1µs turn-on/off) with adaptive VOUT control. This ensures the LED current waveform remains square and stable-even at 0.01% duty cycle-preserving spectral output and avoiding the color shift common with slow-switching or analog-dimming-only solutions.
Can the LT3597EUHG#TRPBF drive LED strings with different numbers of LEDs per channel?
Yes. The LT3597EUHG#TRPBF's per-channel adaptive VOUT control independently regulates each buck output to maintain ~1V across its respective current sink. This allows mixed LED string lengths (e.g., 8 red, 10 green, 12 blue) without efficiency penalty or cross-channel interference-unlike fixed-output multi-channel drivers.
What is the role of the CTRLM pin on the LT3597EUHG#TRPBF, and how does it differ from TSET?
The CTRLM pin on the LT3597EUHG#TRPBF enables LED-specific thermal derating using an NTC resistor placed near the LED strings, while TSET sets the IC's absolute junction temperature limit. CTRLM provides early, proportional current reduction based on LED ambient temperature-protecting LEDs per manufacturer specs-whereas TSET acts as a final safety cutoff for the IC itself.
Does the LT3597EUHG#TRPBF require external compensation components?
No. The LT3597EUHG#TRPBF features internal compensation for its peak-current-mode buck regulators, eliminating the need for external compensation networks. Combined with integrated soft-start, this simplifies design, reduces BOM count, and improves layout robustness-especially important in high-density LED display PCBs.
LT3597EUHG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 39 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA
- Frequency:
- 200kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (5x8)
LT3597EUHG#TRPBF FAQ
1.How can I place an order for LT3597EUHG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3597EUHG#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 LT3597EUHG#TRPBF reliable?
The price and inventory of LT3597EUHG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3597EUHG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3597EUHG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3597EUHG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3597EUHG#TRPBF?
LT3597EUHG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3597EUHG#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 LT3597EUHG#TRPBF?
For technical support, including LT3597EUHG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3597EUHG#TRPBF requirements.
6.How does Aetrix verify that LT3597EUHG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3597EUHG#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 LT3597EUHG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3597EUHG#TRPBF?
All LT3597EUHG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3597EUHG#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 LT3597EUHG#TRPBF part is unused and in its original packaging.
Return procedure for LT3597EUHG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3597EUHG#TRPBF Tags
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