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Analog Devices Inc. LT3597IUHG#TRPBF
- Part No.:
- LT3597IUHG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3597IUHG#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
LT3597IUHG#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 thermal derating via NTC-based TSET/CTRLM programming. Designed for RGB pixel-level driving in large-format LED displays.
For engineers reviewing the LT3597IUHG#TRPBF datasheet, LT3597IUHG#TRPBF pinout, LT3597IUHG#TRPBF application, or LT3597IUHG#TRPBF equivalent, key selection criteria include channel-matched ±2% LED current accuracy, 200kHz–1MHz programmable switching frequency, open/short LED fault reporting on FAULT pin, and 52-lead 5mm × 8mm QFN thermal package with high-voltage pin spacing.
Technical Context
The LT3597IUHG#TRPBF implements peak-current-mode-controlled buck regulators per channel, each with adaptive output voltage regulation to minimize power loss across mismatched LED string counts. Its internal 1.22V FB reference and 1.1V LED sink compliance voltage enable precise current control while maintaining ≥1V headroom for optimal efficiency.
It features synchronized PWM dimming logic with dedicated PWM1–3 inputs, analog dimming via CTRL1–3 (0–1.0V linear range), and master thermal regulation using external NTC networks on TSET and CTRLM pins. Fault detection includes open-LED (≥12V threshold) and shorted-LED (≤1.25V above VOUT) reporting through an open-drain FAULT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive LED power rails without pre-regulation. |
| Max LED Current per Channel | 100mA - set by external ISET resistor; ±2% matching ensures consistent RGB color balance. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables true-color dimming down to 1µs pulses without color shift. |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT pin resistor; synchronizable to external clock for EMI reduction. |
| Thermal Derating Control | Programmable via TSET pin - sets junction temperature threshold (e.g., 85°C–115°C) for automatic LED current reduction. |
| Package | 52-lead 5mm × 8mm QFN - thermally enhanced with exposed pad (Pin 53 = GND); 0.6mm high-voltage creepage spacing. |
| Operating Junction Temp | –40°C to +125°C - qualified for automotive and industrial ambient environments. |
Pinout & Package
LT3597IUHG#TRPBF uses a 52-lead plastic QFN package (5mm × 8mm, 0.6mm height), thermally optimized with exposed GND pad (Pin 53) requiring PCB soldering for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 50, 51) | Primary input supply | Dual-pin fused input for 6–60V rail; requires local 10µF ceramic bypass. |
| LED1–3 (Pins 20, 21, 24) | Constant-current sink outputs | Open-collector NPN drivers; each delivers up to 100mA with ±2% matching; rated for 42V max VOUT. |
| ISET1–3 (Pins 14, 15, 16) | LED current programming | Resistor-to-GND sets full-scale current (e.g., 20kΩ = 100mA); follows ILED = 2×(1V/RISET) mA. |
| PWM1–3 (Pins 30, 29, 28) | Digital dimming control | Logic-high enables current sink; supports 10,000:1 PWM ratio at 100Hz; tie to VREF if unused. |
| CTRL1–3 (Pins 33, 32, 31) | Analog dimming control | 0–1.0V input linearly scales LED current; >1.0V clamps at full scale; tie to VREF if unused. |
| TSET (Pin 11) | Junction temperature threshold | NTC-based voltage divider sets thermal shutdown point (e.g., 540mV = 85°C); protects die under sustained overload. |
| FAULT (Pin 25) | Fault reporting output | Open-drain active-low signal indicating open/short LED or thermal fault; requires external pull-up. |
| GND (Pins 18, 53) | Power and signal ground | Pin 18 = signal GND; Pin 53 = exposed thermal pad = GND - must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Triple adaptive buck architecture | Each channel independently regulates VOUT to maintain ~1V across LED sink - maximizes efficiency across varying LED counts per string. |
| True Color PWM™ dimming | Guaranteed 10,000:1 ratio at 100Hz with <1µs minimum pulse width - preserves chromaticity across full brightness range. |
| ±2% LED current matching | Measured across all three channels at full scale - eliminates visible color drift in RGB pixel applications. |
| Integrated open/short LED protection | Detects open LED (>12V at LEDx) and shorted LED (<1.25V above VOUTx); disables faulty channel and asserts FAULT pin. |
| Programmable thermal derating | Uses external NTC on TSET and CTRLM to implement manufacturer-specified LED current vs. temperature curves. |
Applications
| RGB LED Billboards | Mono/Full-Color Display Backlighting |
|---|---|
Use Scenario: Outdoor digital signage with high-brightness RGB SMD LEDs arranged in dense pixel arrays. IC Role / Device Role / Timing Role: Triple-channel constant-current driver delivering synchronized PWM dimming and adaptive VOUT per pixel group. Use Value: Enables uniform white-point stability and flicker-free 10,000:1 dimming across thousands of pixels under variable ambient temperature. | Use Scenario: Large-screen LCD backlight using edge-lit or direct-lit LED arrays with separate R/G/B zones. IC Role / Device Role / Timing Role: Independent current source per color channel, supporting dynamic local dimming and color gamut tuning. Use Value: Maintains precise color balance (±2% current match) and thermal derating per zone to prevent LED lumen depreciation. |
| Automotive Interior Displays | Industrial HMI Panels |
Use Scenario: Dashboard and infotainment displays requiring AEC-Q100-compliant LED drivers with extended temperature operation. IC Role / Device Role / Timing Role: High-reliability RGB driver with fault reporting (FAULT pin), UVLO, and thermal protection for harsh cabin environments. Use Value: Ensures fail-safe operation with open/short LED detection and junction temperature limiting up to 125°C. | Use Scenario: Factory-floor HMIs exposed to wide ambient swings and EMI-rich environments. IC Role / Device Role / Timing Role: Robust triple buck LED controller with SYNC pin for clock synchronization and RT-programmable frequency to avoid noise bands. Use Value: Delivers stable brightness control and EMC compliance via externally synchronized switching. |
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 |
|---|---|---|---|
| LT3743EFE#TRPBF | Single-channel 100mA buck LED driver with 1000:1 PWM dimming; no integrated thermal derating or multi-channel sync. | Suitable only for monochrome or time-multiplexed RGB systems; lacks per-channel analog dimming and TSET/CTRLM support. | Select when cost-sensitive single-string designs require high-speed current regulation but not RGB pixel-level control. |
| MAX20050ATP/V+T | Triple-channel 150mA automotive-grade LED driver; supports 5000:1 PWM at 100Hz; includes SPI interface and diagnostics. | Requires microcontroller interface for configuration; adds system complexity but offers richer fault logging and parametric control. | Prefer when CAN-connected vehicle ECUs demand diagnostic reporting and programmable safety thresholds beyond LT3597IUHG#TRPBF's analog-only interface. |
Compared with LT3597IUHG#TRPBF, LT3743EFE#TRPBF reduces integration for single-string use but sacrifices RGB timing coherence and thermal intelligence, while MAX20050ATP/V+T adds digital configurability at the cost of analog simplicity and higher BOM count.
Availability
LT3597IUHG#TRPBF is available at Aetrix Electronics and suitable for RGB LED billboards, automotive interior displays, and industrial HMI panels requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT3597IUHG#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.
The LT3597IUHG#TRPBF belongs to Linear's precision LED driver product line, engineered specifically for high-fidelity, thermally robust RGB pixel control in outdoor signage and display backlighting applications.
FAQ
What is the maximum LED string voltage supported by the LT3597IUHG#TRPBF?
The LT3597IUHG#TRPBF supports up to 42V at the VOUT1–3 pins and 42V at the LED1–3 pins. This allows driving strings of up to ~12 white LEDs (3.5V each) or ~14 red LEDs (3.0V each) per channel. The absolute maximum rating for LEDx pins is 42V, and exceeding this may cause permanent damage. Always verify string voltage against the specific LED forward voltage and temperature coefficient in your design.
How does the LT3597IUHG#TRPBF achieve 10,000:1 PWM dimming at 100Hz?
The LT3597IUHG#TRPBF achieves 10,000:1 PWM dimming at 100Hz by combining fast NPN current sources with sub-1µs turn-on/turn-off times and adaptive VOUT pre-charging. When PWM1–3 is low, the corresponding buck output rises to a high voltage (enabling immediate current delivery), allowing reliable 1µs on-pulses at 100Hz (10ms period). This architecture avoids slow ramp-up delays that limit conventional drivers.
Can the LT3597IUHG#TRPBF operate without external compensation components?
Yes, the LT3597IUHG#TRPBF features internal compensation and soft-start circuitry, eliminating the need for external compensation networks. This simplifies layout and reduces BOM count. However, external components such as input/output capacitors, boost capacitors, catch diodes, and inductors remain mandatory. The internal compensation is optimized for standard 100–470µH inductor values and ceramic output capacitors.
What is the function of the CTRLM pin on the LT3597IUHG#TRPBF?
The CTRLM pin on the LT3597IUHG#TRPBF enables programmable LED current derating versus ambient temperature using an external NTC resistor network. Unlike TSET (which triggers hard thermal shutdown), CTRLM provides a smooth, linear reduction in LED current as temperature rises - aligning with LED manufacturer derating curves to extend lifetime and prevent thermal runaway.
Does the LT3597IUHG#TRPBF support synchronization to an external clock?
Yes, the LT3597IUHG#TRPBF supports external clock synchronization via the SYNC pin (Pin 27). When driven with a clean CMOS clock signal, the internal buck regulators lock to that frequency - provided the programmed RT-resistor frequency is at least 20% lower than the SYNC frequency. This capability reduces conducted EMI and enables deterministic timing in multi-driver systems.
LT3597IUHG#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)
LT3597IUHG#TRPBF FAQ
1.How can I place an order for LT3597IUHG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3597IUHG#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 LT3597IUHG#TRPBF reliable?
The price and inventory of LT3597IUHG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3597IUHG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3597IUHG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3597IUHG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3597IUHG#TRPBF?
LT3597IUHG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3597IUHG#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 LT3597IUHG#TRPBF?
For technical support, including LT3597IUHG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3597IUHG#TRPBF requirements.
6.How does Aetrix verify that LT3597IUHG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3597IUHG#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 LT3597IUHG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3597IUHG#TRPBF?
All LT3597IUHG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3597IUHG#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 LT3597IUHG#TRPBF part is unused and in its original packaging.
Return procedure for LT3597IUHG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3597IUHG#TRPBF Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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CL2N8-G
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