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Analog Devices Inc. LT3597IUHG#PBF
- Part No.:
- LT3597IUHG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3597IUHG#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
LT3597IUHG#PBF 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 True Color PWM™ dimming up to 10,000:1 at 100Hz. It integrates fast NPN current sources for sub-1µs pulse widths and supports thermal derating via TSET/CTRLM pins. Designed for RGB pixel-level driving in large-format LED displays.
For engineers reviewing the LT3597IUHG#PBF datasheet, LT3597IUHG#PBF pinout, LT3597IUHG#PBF application, or LT3597IUHG#PBF equivalent, key selection criteria include channel-matched ±2% LED current accuracy, 200kHz–1MHz programmable switching frequency, open/short LED fault reporting, 6V–60V input range, and thermally enhanced 52-lead QFN package with 0.6mm high-voltage pin spacing.
Technical Context
The LT3597IUHG#PBF 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 soft-start, slope compensation, and dual current-limit protection (high-side switch + low-side off-phase) ensure stable startup and fault resilience.
True Color PWM™ dimming is achieved through synchronized, fast-turnoff NPN current sinks enabling 1µs minimum on-time at 100Hz - independent of VOUT ramp-up timing due to pre-charged adaptive output rails. Analog dimming via CTRL1–3 pins provides linear 0–100% current control below 1.0V, while thermal management uses both fixed-junction-temperature derating (TSET) and NTC-based LED-current-vs-ambient curves (CTRLM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-range industrial and automotive LED power rails without external pre-regulation. |
| Max LED Current per Channel | 100mA - set by external ISET resistor; matched within ±2% between channels for consistent RGB color balance. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables precise brightness control down to 0.01% duty cycle with no color shift. |
| Switching Frequency Range | 200kHz to 1MHz - programmable via RT pin resistor; synchronizable to external clock for EMI reduction. |
| Thermal Derating Control | Programmable via TSET pin (540mV threshold) and CTRLM with NTC network - protects LEDs and IC under ambient temperature rise. |
| LED Fault Detection | Open-LED detection (≥12V on LEDx) and short-LED reporting (≤1.25V from VOUTx) - fault signaled on open-drain FAULT pin. |
| Package | 52-lead 5mm × 8mm QFN with exposed thermal pad - rated for –40°C to 125°C junction temperature; requires PCB soldering of exposed pad. |
Pinout & Package
LT3597IUHG#PBF is housed in a thermally enhanced 52-lead plastic QFN (UHG package), 5mm × 8mm footprint, 0.6mm high-voltage pin spacing, with exposed pad (Pin 53) tied to GND and mandatory for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–3 (Pins 20,21,24) | Constant-current sink output | Open-collector NPN drivers; each delivers up to 100mA with ±2% matching; cathode-connected to LED strings. |
| VOUT1–3 (Pins 19,22,23) | Buck regulator output sense | Feedback node for adaptive VOUT control; sets minimum headroom (1.1V) above LED string forward voltage. |
| ISET1–3 (Pins 14,15,16) | LED current programming input | Resistor-to-GND sets full-scale current: ILED = 2V / RISET (e.g., 20kΩ → 100mA). |
| PWM1–3 (Pins 30,29,28) | Digital dimming enable | Logic-high enables current sink; supports 10,000:1 True Color PWM™ dimming at 100Hz with <1µs pulse width. |
| CTRL1–3 (Pins 33,32,31) | Analog dimming control | 0–1.0V input linearly scales LED current from 0–100%; >1.0V holds max current. |
| TSET (Pin 11) | Junction temperature derating trigger | 540mV threshold initiates linear LED current reduction when die temperature exceeds programmed limit. |
| CTRLM (Pin 13) | NTC-based thermal derating reference | Accepts voltage divider with NTC resistor to implement LED manufacturer-recommended current-vs-temp derating curve. |
| FAULT (Pin 25) | Open-drain fault reporting | Active-low signal indicates open/short LED fault or thermal over-limit; requires external pull-up. |
| GND (Pins 18,53) | Power and signal ground | Pin 53 is exposed thermal pad - must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT regulation | Maintains only ~1.1V overhead above LED string VF per channel - maximizes efficiency across varying LED counts and VF drift. |
| True Color PWM™ dimming | Guarantees 10,000:1 ratio at 100Hz using fast NPN sinks and pre-charged VOUT rails - preserves chromaticity across full dimming range. |
| ±2% LED current matching | Ensures uniform luminance and color point across RGB channels without external calibration or trimming. |
| Integrated thermal protection | Two-tier scheme: fixed-junction-temperature derating (TSET) + NTC-driven LED-current-vs-ambient curve (CTRLM) per manufacturer specs. |
| Comprehensive fault reporting | Detects and reports open LED (≥12V on LEDx), shorted LED (≤1.25V from VOUTx), and thermal over-limit on single FAULT pin. |
Applications
| RGB LED Billboards | Full-Color Video Walls |
|---|---|
Use Scenario: Outdoor digital signage with high-brightness RGB SMD LEDs driven in pixel clusters. IC Role / Device Role / Timing Role: Triple-channel constant-current driver delivering synchronized 100mA per color with adaptive VOUT and 10,000:1 PWM dimming. Use Value: Enables true black-level contrast and flicker-free video playback at ambient temperatures up to 125°C junction, with automatic thermal derating preserving LED lifetime. | Use Scenario: Indoor high-resolution video wall using 1R1G1B discrete LEDs per pixel, requiring precise color fidelity. IC Role / Device Role / Timing Role: Pixel-level RGB driver with ±2% inter-channel current matching and analog/digital dimming coexistence. Use Value: Eliminates visible color banding during low-brightness scenes; supports simultaneous PWM and CTRL-based dimming for hybrid brightness/color tuning. |
| Automotive Display Backlighting | Medical Imaging Panel Lighting |
Use Scenario: Dashboard and infotainment display backlight with wide VIN (9–16V automotive) and thermal stress from enclosed enclosures. IC Role / Device Role / Timing Role: Triple buck LED driver with programmable UVLO, 60V input tolerance, and NTC-based thermal derating aligned to LED spec sheets. Use Value: Maintains calibrated white-point stability across –40°C to +105°C ambient via CTRLM-driven current reduction - no firmware intervention required. | Use Scenario: Diagnostic imaging panels requiring flicker-free, precisely calibrated white light with zero EMI interference to sensitive sensors. IC Role / Device Role / Timing Role: Low-noise triple LED driver with external clock synchronization (SYNC pin) and 200kHz–1MHz frequency selection to avoid sensor sampling bands. Use Value: Enables EMI-quiet operation in proximity to CCD/CMOS detectors; adaptive VOUT minimizes heat generation critical for thermal drift-sensitive optics. |
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 controller; requires external MOSFETs and current sense; no integrated current sinks. | Suitable for high-power single-string designs; lacks multi-channel integration and True Color PWM™. | Select when >100mA/channel or discrete FET optimization is needed; not drop-in for RGB pixel driving. |
| MAX16833ATP+T | Triple-channel 40V LED driver with 150mA max per channel; uses external current sense resistors; no adaptive VOUT or NTC thermal derating. | Higher current capability but narrower input range; limited to 1000:1 PWM dimming; no integrated TSET/CTRLM thermal architecture. | Choose for cost-sensitive, lower-voltage (<40V) applications where ±3% current matching suffices and thermal derating is handled externally. |
Compared with LTC3783EFE#PBF and MAX16833ATP+T, the LT3597IUHG#PBF uniquely integrates matched 100mA NPN sinks, adaptive VOUT, and dual-mode thermal protection - making it the only solution supporting 10,000:1 flicker-free dimming and RGB color fidelity in a single 52-pin QFN package for 6–60V systems.
Availability
LT3597IUHG#PBF is available at Aetrix Electronics and suitable for LED billboards, full-color video walls, and automotive display backlighting requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LT3597IUHG#PBF 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 LT3597IUHG#PBF belongs to Linear's high-voltage LED driver product line, engineered specifically for RGB pixel-level driving in large-format displays where color accuracy, thermal resilience, and ultra-high dimming ratios are mission-critical.
FAQ
What is the maximum LED string voltage supported by the LT3597IUHG#PBF?
The LT3597IUHG#PBF supports up to 42V on its LED1–3 pins and VOUT1–3 pins, allowing driving of typical RGB LED strings (e.g., 12–14 white LEDs @ 3.5V VF). This rating is validated per Absolute Maximum Ratings and confirmed in Electrical Characteristics tables for LED pin voltage and VOUT range.
Does the LT3597IUHG#PBF require external current sense resistors?
No, the LT3597IUHG#PBF does not require external current sense resistors. It uses internal precision current sources with ISET1–3 pins accepting external resistors to ground (e.g., 20kΩ for 100mA) to set full-scale LED current - eliminating sensing losses and board space.
Can the LT3597IUHG#PBF operate with a 12V input supply?
Yes, the LT3597IUHG#PBF operates from 6V to 60V input, so 12V is fully supported. At 12V, the adaptive VOUT loop ensures minimal headroom (≈1.1V) above LED string VF, maintaining high efficiency even with low input-to-VF differential.
How is thermal derating implemented on the LT3597IUHG#PBF?
The LT3597IUHG#PBF implements two independent thermal derating methods: (1) fixed-junction-temperature limit via TSET pin (540mV threshold), and (2) NTC-based LED-current-vs-ambient curve via CTRLM pin. Both are programmable using resistor dividers from the 2.0V VREF pin, as detailed in Applications Information sections.
Is the LT3597IUHG#PBF pin-compatible with the LT3597EUHG#PBF?
Yes, the LT3597IUHG#PBF and LT3597EUHG#PBF share identical pinout, package (52-lead QFN), and electrical functionality. The only difference is temperature grade: IUHG is specified for –40°C to 125°C, while EUHG is 0°C to 125°C - both use the same LT3597IUHG#PBF silicon die and layout.
LT3597IUHG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN, 39 Leads, Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3597IUHG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3597IUHG#PBF 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#PBF reliable?
The price and inventory of LT3597IUHG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3597IUHG#PBF is usually 5 days.
3.What payment methods are accepted for LT3597IUHG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3597IUHG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3597IUHG#PBF?
LT3597IUHG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3597IUHG#PBF 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#PBF?
For technical support, including LT3597IUHG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3597IUHG#PBF requirements.
6.How does Aetrix verify that LT3597IUHG#PBF is sourced from the original manufacturer or authorized distributors?
All LT3597IUHG#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3597IUHG#PBF?
All LT3597IUHG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3597IUHG#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3597IUHG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3597IUHG#PBF Tags
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