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Analog Devices Inc. LT3597EUHG#PBF
- Part No.:
- LT3597EUHG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 52-WFQFN, 39 Leads, Exposed Pad
- Datasheet:
-
LT3597EUHG#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 100MA 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,530
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Product details
Overview
LT3597EUHG#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 RGB single-pixel LED driving in large-format displays.
For engineers reviewing the LT3597EUHG#PBF datasheet, LT3597EUHG#PBF pinout, LT3597EUHG#PBF application, or LT3597EUHG#PBF 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, open/short LED fault reporting on FAULT pin, and 52-lead 5mm × 8mm QFN package with high-voltage pin spacing.
Technical Context
The LT3597EUHG#PBF implements peak-current-mode controlled buck regulation per channel, with adaptive output voltage control that dynamically adjusts VOUT1–3 to maintain ~1V across each LED sink-optimizing efficiency across mismatched LED string counts. Each channel features independent ISET-programmed current (up to 100mA), analog dimming via CTRL1–3 (0–1.0V linear range), and digital PWM dimming via PWM1–3 (100Hz, 0.01%–100% duty cycle).
Fault protection includes open-LED detection (LEDx > 12V or >1.25V below VOUTx), shorted-LED reporting (relative to GND and VOUTx), and thermal derating triggered by TSET voltage (540mV threshold). Synchronization via SYNC pin requires external clock ≥20% higher than RT-set frequency, and internal soft-start ensures controlled startup without inrush.
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 (e.g., 20kΩ yields 100mA); matched within ±2% between channels. |
| PWM Dimming Ratio | 10,000:1 at 100Hz - enables true-color dimming with 1µs minimum on-time and no color shift. |
| Switching Frequency Range | 200kHz to 1MHz - programmed via RT-to-GND resistor; synchronizable to external clock. |
| Thermal Derating Threshold | Programmable via TSET pin - 540mV triggers linear LED current reduction; junction temperature limit set by resistor divider from VREF. |
| Package | 52-lead 5mm × 8mm QFN - thermally enhanced with exposed pad (Pin 53 = GND); 0.6mm high-voltage pin spacing isolates BOOST/SW domains. |
| Operating Junction Temp | –40°C to 125°C - specified for extended industrial and automotive ambient conditions. |
Pinout & Package
LT3597EUHG#PBF uses a 52-lead plastic QFN (UHG package), 5mm × 8mm footprint, 0.6mm high-voltage creepage spacing, and thermally enhanced exposed pad (Pin 53) soldered to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–3 (Pins 20,21,24) | Constant-current sink output | Open-collector NPN outputs; each sinks up to 100mA with ±2% matching; rated for 42V max VOUT–LED differential. |
| VOUT1–3 (Pins 19,22,23) | Buck regulator output sense | Feedback node for adaptive VOUT control; sets maximum buck output voltage via FB1–3 resistor divider. |
| ISET1–3 (Pins 14,15,16) | LED current programming input | Resistor-to-GND sets full-scale current (e.g., 20kΩ → 100mA); governed by ILED = 2×(1V/RISET) mA. |
| PWM1–3 (Pins 30,29,28) | Digital dimming enable | Logic-high enables current sink; low disables sink and forces buck into pulse-skipping mode for fast restart. |
| CTRL1–3 (Pins 33,32,31) | Analog dimming control | 0–1.0V input linearly scales LED current from 0–100%; >1.0V clamps at full scale. |
| TSET (Pin 11) | Thermal derating trigger | 540mV threshold initiates linear LED current reduction; junction temperature limit set by VREF-resistor divider. |
| CTRLM (Pin 13) | Master thermal derating control | Accepts NTC-based voltage with negative tempco to implement LED manufacturer-specified current vs. temp derating curves. |
| FAULT (Pin 25) | Open/short LED fault indicator | Open-drain output pulled high externally; asserts low on open LED, shorted LED, or TSET-triggered thermal fault. |
| SYNC (Pin 27) | External clock input | Synchronizes all three buck regulators; requires external clock ≥20% above RT-set frequency. |
| RT (Pin 17) | Frequency programming | Resistor-to-GND sets switching frequency (e.g., 33.2kΩ → 1MHz); must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive VOUT control | Maintains ~1V across each LED sink, minimizing power loss and enabling optimal efficiency even with mismatched LED string counts. |
| True Color PWM™ dimming | 10,000:1 ratio at 100Hz with <1µs pulse width capability-preserves LED chromaticity across full brightness range. |
| ±2% LED current matching | Guaranteed inter-channel matching over –40°C to 125°C junction temperature-critical for RGB color fidelity in displays. |
| Programmable thermal derating | TSET pin enables precise junction temperature limiting; CTRLM pin supports NTC-based LED-specific current vs. temp derating curves. |
| Integrated fault reporting | Single FAULT pin reports open LED, shorted LED (to GND or VOUT), and thermal overtemperature-reducing system-level monitoring complexity. |
Applications
| LED Billboards & Signboards | RGB Full-Color Displays |
|---|---|
Use Scenario: Outdoor large-format signage requiring high-brightness, long-life LED strings with precise color consistency across thousands of pixels. IC Role / Device Role / Timing Role: Triple-channel constant-current LED driver with adaptive buck regulation per RGB subpixel; enables synchronized True Color PWM dimming across all channels. Use Value: ±2% current matching ensures stable white point and color gamut; 10,000:1 dimming preserves color accuracy at low brightness for nighttime readability. | Use Scenario: Indoor video walls and broadcast-grade displays where pixel-level brightness uniformity and thermal stability are critical. IC Role / Device Role / Timing Role: Single-chip RGB pixel driver delivering independent 100mA currents per channel with programmable thermal derating tied to local NTC sensors. Use Value: CTRLM-driven LED current derating prevents luminance drift and color shift under sustained high-ambient operation-extending display lifetime. |
| Automotive Display Backlighting | Medical Imaging Panel Lighting |
Use Scenario: Instrument cluster and infotainment displays operating across –40°C to +105°C ambient with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: High-input-voltage (up to 60V) triple buck LED driver supporting CAN/LIN-controlled dimming via PWM1–3 and CTRL1–3 inputs. Use Value: 6V–60V VIN range accommodates cold-crank and load-dump transients; SYNC pin enables EMI reduction via spread-spectrum clock alignment. | Use Scenario: Diagnostic imaging panels requiring flicker-free, calibrated illumination with zero color variation during long exposure cycles. IC Role / Device Role / Timing Role: Precision current source with <1µs PWM edge control and open/short LED fault detection for fail-safe operation in safety-critical lighting. Use Value: FAULT pin assertion halts illumination on first detected LED failure-meeting IEC 62304 Class B software safety requirements. |
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#PBF | Single-channel 150mA peak-current-mode controller with integrated gate driver; no adaptive VOUT or multi-channel integration. | Requires three separate ICs and external current sensing for RGB; lacks integrated FAULT reporting and TSET/CTRLM thermal management. | Use only when discrete channel control, higher peak current (>100mA), or external MOSFET selection is required. |
| MAX16833ATL+T | Triple-channel 100mA LED driver with 4.5V–65V input, but fixed 500kHz switching and no True Color PWM-max 1000:1 dimming at 100Hz. | No adaptive VOUT; no TSET/CTRLM thermal derating; FAULT reporting limited to open-LED only. | Select when cost sensitivity outweighs need for 10,000:1 dimming, adaptive efficiency, or comprehensive thermal protection. |
Compared with LT3597EUHG#PBF, LT3743EFE#PBF offers higher per-channel current but demands board-level replication for RGB, while MAX16833ATL+T provides triple integration at lower dimming resolution and no adaptive output voltage-making LT3597EUHG#PBF uniquely suited for high-fidelity, thermally robust, large-format LED systems.
Availability
LT3597EUHG#PBF is available at Aetrix Electronics and suitable for LED billboards and signboards, RGB full-color displays, automotive display backlighting, and medical imaging panel lighting requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to 125°C.
Supply support for LT3597EUHG#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, Inc. (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and signal integrity in demanding environments.
The LT3597EUHG#PBF belongs to Linear's high-voltage LED driver product line, engineered specifically for large-format, multi-color LED systems requiring tight current matching, ultra-high dimming fidelity, and intelligent thermal management without external microcontroller intervention.
FAQ
What is the maximum LED string voltage supported by the LT3597EUHG#PBF?
The LT3597EUHG#PBF supports up to 42V across each LED string (VOUTx to LEDx), with absolute maximum ratings specifying LED1–3 and VOUT1–3 pins at 42V. This allows driving up to ~12 white LEDs (3.5V VF each) per channel while maintaining margin for thermal and forward-voltage variation. The 60V VIN rating ensures compatibility with 48V bus systems including automotive and industrial supplies.
How does the LT3597EUHG#PBF achieve 10,000:1 PWM dimming at 100Hz?
The LT3597EUHG#PBF achieves 10,000:1 PWM dimming at 100Hz using fast NPN current sources with sub-1µs turn-on/turn-off times and adaptive VOUT control. When PWM1–3 goes low, the corresponding buck regulator enters pulse-skipping mode and pre-charges VOUT to a high voltage-ensuring immediate current delivery upon PWM high assertion. This eliminates settling delay and enables reliable 1µs on-pulses at 100Hz (10ms period), yielding the full 10,000:1 ratio without color shift.
Can the LT3597EUHG#PBF drive LED strings with different numbers of LEDs per channel?
Yes, the LT3597EUHG#PBF is explicitly designed for mismatched LED strings. Its adaptive VOUT control independently regulates each buck output (VOUT1–3) to maintain ~1V across its respective LED sink-regardless of string count. This ensures optimal efficiency per channel and preserves ±2% current matching even when one channel drives 3 LEDs and another drives 10, eliminating cross-channel interference and thermal coupling issues.
What is the role of the CTRLM pin on the LT3597EUHG#PBF, and how is it configured?
The CTRLM pin on the LT3597EUHG#PBF enables LED manufacturer-compliant thermal derating by accepting a voltage with negative temperature coefficient (NTC). Configured as a resistor divider between VREF (2.0V) and an NTC thermistor placed near the LED strings, CTRLM voltage drops as temperature rises-linearly reducing LED current before reaching the TSET-triggered hard thermal limit. This implements application-specific derating curves without firmware, protecting LEDs per their datasheet specifications.
Does the LT3597EUHG#PBF require external compensation components for the buck regulators?
No, the LT3597EUHG#PBF features fully internal compensation for all three buck regulators. Its peak-current-mode architecture with built-in slope compensation and soft-start circuitry eliminates the need for external compensation networks-reducing BOM count, layout complexity, and tuning effort. Only standard external components are required: input/output capacitors, power inductors, catch diodes, ISET resistors, RT resistor, and optional TSET/CTRLM dividers.
LT3597EUHG#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)
LT3597EUHG#PBF FAQ
1.How can I place an order for LT3597EUHG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3597EUHG#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 LT3597EUHG#PBF reliable?
The price and inventory of LT3597EUHG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3597EUHG#PBF is usually 5 days.
3.What payment methods are accepted for LT3597EUHG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3597EUHG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3597EUHG#PBF?
LT3597EUHG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3597EUHG#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 LT3597EUHG#PBF?
For technical support, including LT3597EUHG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3597EUHG#PBF requirements.
6.How does Aetrix verify that LT3597EUHG#PBF is sourced from the original manufacturer or authorized distributors?
All LT3597EUHG#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 LT3597EUHG#PBF meets industry standards.
7.What is the process for return or replacement of LT3597EUHG#PBF?
All LT3597EUHG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3597EUHG#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 LT3597EUHG#PBF part is unused and in its original packaging.
Return procedure for LT3597EUHG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3597EUHG#PBF Tags
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