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Analog Devices Inc. LT3595EUHH#PBF
- Part No.:
- LT3595EUHH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 56-WFQFN Exposed Pad
- Datasheet:
-
LT3595EUHH#PBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 50MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,569
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Product details
Overview
LT3595EUHH#PBF from Analog Devices (formerly Linear Technology) is a 16-channel buck-mode LED driver IC designed for high-precision, uniform-brightness LED string control in large-area displays. It delivers up to 50mA per channel with 8% relative current matching, operates from 4.5V to 45V input, integrates 100mA/45V power switches and Schottky diodes, and supports 5000:1 True Color PWM dimming at 100Hz - enabling video-grade brightness control in stadium billboards and LCD TV backlights.
For engineers reviewing the LT3595EUHH#PBF datasheet, LT3595EUHH#PBF pinout, LT3595EUHH#PBF application, or LT3595EUHH#PBF equivalent, key selection considerations include its 56-pin QFN package, RSET-programmable master current (10–50mA), open-LED fault reporting via OPENLED pin, thermal protection, and 2MHz switching frequency enabling compact 100μH inductor use.
Technical Context
The LT3595EUHH#PBF implements a fixed-frequency (1.6–2.4MHz), current-mode buck architecture shared across 16 independent channels, each with dedicated Lx/SWx nodes, PWMx inputs, and internal 100mA/45V NPN switch plus integrated Schottky diode. All 16 channels share one oscillator, V-I converter, and 3.3V VCC regulator, but maintain individual current regulation via RSET-scaled reference and per-channel PWM timing.
Operation requires synchronized rising edges on PWM1–PWM16 to enable channel conduction; falling edges may be asynchronous. Minimum on-time is 2μs, maximum period 10ms (100Hz), enabling 5000:1 dimming ratio. Open-LED detection pulls the OPENLED pin low during fault or startup until regulation is achieved.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive LED power rails without external pre-regulation. |
| LED Current per Channel | 10mA to 50mA (set by RSET resistor) - enables precise brightness tuning across diverse LED forward voltage stacks. |
| Current Matching | ±8% at 20mA - ensures uniform luminance across all 16 channels without per-string calibration. |
| Dimming Ratio | 5000:1 True Color PWM - preserves color fidelity at ultra-low brightness levels (e.g., dark-scene video playback). |
| Switching Frequency | 2MHz typical - allows use of tiny 100μH shielded inductors and 0.47μF ceramic output capacitors, minimizing board area. |
| Integrated Switches | 16 × 100mA, 45V-rated NPN transistors - eliminates external high-voltage switching components and reduces BOM count. |
| Thermal Protection | Junction shutdown at 125°C - prevents damage during sustained overloads or poor heatsinking in enclosed displays. |
Pinout & Package
LT3595EUHH#PBF is housed in a 56-pin plastic QFN package measuring 5mm × 9mm × 0.75mm, with an exposed thermal pad (Pin 57) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| L1–L16 (Pins 1,3,7,9,10,12,16,18,29,31,35,37,38,40,44,46) | LED Anode Connection | High-side node for each LED string; connects to anode of topmost LED - sets string voltage headroom requirement. |
| SW1–SW16 (Pins 2,4,6,8,11,13,15,17,30,32,34,36,39,41,43,45) | Switch Collector Output | Internal NPN collector node; connects directly to inductor - requires minimal trace area to suppress EMI. |
| VIN (Pins 5,14) | Main Power Input | 4.5V–45V supply input; both pins must be shorted and locally bypassed with ≥10μF ceramic capacitor. |
| PWM1–PWM16 (Pins 19–22,25–28,47–50,53–56) | Channel Dimming Control | TTL-compatible inputs; rising edge enables channel conduction - synchronization required across all 16 channels. |
| RSET (Pin 51) | Master Current Programming | Connects to precision resistor (e.g., 75.0kΩ for 20mA); sets identical LED current across all 16 channels. |
| OPENLED (Pin 23) | Fault Reporting Output | Open-drain output pulled low during open-LED fault or startup - serves as "power OK" signal when regulated. |
| SHDN (Pin 24) | Global Enable/Disable | Logic-high (>1.6V) enables operation; logic-low (<0.4V) places device in <40μA shutdown mode. |
| VCC (Pin 52) | Bias Supply Input | 3.3V ±10% internal regulator input; requires local 10μF bypass capacitor - powers control circuitry only. |
| NC (Pins 33,42) | No Connect | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| 16 independent buck regulators | Enables simultaneous driving of 16 separate LED strings (e.g., 16 zones in LCD backlight or 16 segments in signage) without cross-talk. |
| Integrated Schottky diodes | Eliminates 16 external diodes - reduces component count, layout area, and thermal stress in high-current display applications. |
| 8% relative current match | Ensures consistent brightness across all channels at 20mA, critical for seamless image rendering in video billboards. |
| 5000:1 True Color PWM dimming | Maintains chromaticity accuracy down to 0.002× full scale - essential for HDR video and medical imaging displays. |
| Open-LED fault detection | Provides system-level reliability monitoring; OPENLED pin asserts low on any single-string open-circuit failure. |
| 2MHz constant-frequency operation | Permits use of miniature 100μH inductors and 0.47μF X5R/X7R ceramics - ideal for space-constrained display modules. |
Applications
| LED Video Billboards | LCD Television Backlight |
|---|---|
|
Use Scenario: Outdoor digital signage requiring high brightness, wide temperature range (–40°C to 85°C), and long-term luminance uniformity across thousands of LEDs. IC Role / Device Role / Timing Role: Primary 16-channel LED current controller; regulates per-string current while accepting synchronized PWM commands for frame-based dimming. Use Value: 8% current matching and 5000:1 dimming preserve image fidelity and contrast ratio across entire display surface under variable ambient lighting. |
Use Scenario: Edge-lit or direct-lit LCD TV backlight with local dimming zones, where precise per-zone current control improves contrast and power efficiency. IC Role / Device Role / Timing Role: Zone driver IC managing 16 independent backlight segments; accepts PWM signals from timing controller for dynamic scene-based dimming. Use Value: Integrated switches and Schottky diodes reduce zone-driver BOM cost by >30%, while 2MHz switching minimizes inductor height for slim TV profiles. |
| Stadium Display Modules | Advertising Digital Signage |
|
Use Scenario: Modular LED panels deployed in large stadiums, subject to vibration, thermal cycling, and intermittent power - requiring robust fault reporting and thermal resilience. IC Role / Device Role / Timing Role: Fault-aware LED driver with OPENLED pin tied to system microcontroller for real-time string health monitoring and predictive maintenance. Use Value: Open-LED detection and thermal shutdown prevent cascading failures in mission-critical installations, reducing service downtime. |
Use Scenario: Commercial indoor/outdoor signage with varying content brightness, requiring flicker-free dimming and stable color over 50,000+ hours of operation. IC Role / Device Role / Timing Role: High-accuracy current source delivering stable 20mA per channel; RSET resistor ensures drift-free current over time and temperature. Use Value: ±8% matching and True Color PWM eliminate visible banding or color shift during slow-motion or fade-to-black transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3475EFE#PBF | Dual 1.5A step-down LED driver; 2 channels only, no integrated Schottky diodes, 3000:1 dimming. | Suitable for high-current, low-channel-count applications (e.g., automotive headlights), not scalable to 16-zone displays. | Choose LT3475EFE#PBF only when higher per-channel current (>50mA) and fewer channels are required - not a drop-in replacement. |
| LT3518EMSE#PBF | Single-channel 1.3A LED driver in 16-pin QFN; lacks multi-string capability, uses external diodes, 3000:1 dimming. | Designed for single-string high-power LEDs (e.g., architectural lighting), not for distributed multi-zone control. | Use LT3518EMSE#PBF for cost-sensitive, single-string designs where channel count is irrelevant - not functionally equivalent. |
Compared with LT3595EUHH#PBF, LT3475EFE#PBF offers higher per-channel current but cannot replicate 16 independent zones or integrated diodes, while LT3518EMSE#PBF provides no multi-channel capability - making LT3595EUHH#PBF uniquely suited for large-area, high-uniformity LED display systems.
Availability
LT3595EUHH#PBF is available at Aetrix Electronics and suitable for LED video billboards, LCD television backlights, and stadium display modules requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for LT3595EUHH#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 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3595EUHH#PBF.
The LT3595EUHH#PBF belongs to Linear's high-performance LED driver product line, engineered specifically for large-format, multi-zone display systems demanding precision current matching, wide dimming range, and integrated power components.
FAQ
What is the maximum LED string voltage supported by the LT3595EUHH#PBF?
The LT3595EUHH#PBF does not specify a maximum output voltage directly, but its internal 45V-rated switches and 45V absolute maximum Lx pin rating constrain the total LED string voltage to ≤45V minus Schottky forward drop (~0.8V) and switch saturation voltage (~0.45V). For reliable operation, design string voltage ≤42V. The LT3595EUHH#PBF datasheet confirms L1–L16 pins tolerate up to 45V, and typical 10-LED strings at 3.5V VF yield ~35V - well within safe margin.
How is LED current set and trimmed on the LT3595EUHH#PBF?
LED current is set globally across all 16 channels using a single external resistor on the RSET pin (Pin 51), with ILED = 1.21 × 1240 / RSET. For example, a 75.0kΩ resistor yields 20mA. Precision (1%) metal-film resistors are recommended, as ±1% RSET tolerance translates directly to ±1% LED current error. The LT3595EUHH#PBF does not support per-channel trimming - matching relies on internal laser-trimmed references and matched transistor arrays.
Does the LT3595EUHH#PBF require external Schottky diodes?
No, the LT3595EUHH#PBF integrates Schottky diodes internally - one per channel - eliminating the need for 16 external diodes. This is confirmed in the FEATURES section ("Internal Schottky Diodes") and ELECTRICAL CHARACTERISTICS table (Schottky Forward Drop and Leakage specs). External diodes would conflict with internal routing and compromise thermal performance and reliability.
What happens during an open-LED fault on the LT3595EUHH#PBF?
When any of the 16 LED strings opens, the LT3595EUHH#PBF pulls the OPENLED pin (Pin 23) low via an internal open-drain transistor. This fault signal remains active until all strings are restored and regulation re-established. The OPENLED pin also asserts low during startup before regulation - allowing it to serve as a "power OK" indicator once stable operation begins. No latch-up occurs; normal operation resumes automatically after fault clearance.
Can the LT3595EUHH#PBF operate below 4.5V input?
No, the LT3595EUHH#PBF has a minimum input voltage of 4.5V as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below this threshold is not characterized or guaranteed. Attempting to power the LT3595EUHH#PBF from <4.5V may result in erratic regulation, failure to start, or undefined behavior - especially given its internal 3.3V VCC regulator and 100mA switch requirements.
LT3595EUHH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 56-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (5x9)
LT3595EUHH#PBF FAQ
1.How can I place an order for LT3595EUHH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3595EUHH#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 LT3595EUHH#PBF reliable?
The price and inventory of LT3595EUHH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3595EUHH#PBF is usually 5 days.
3.What payment methods are accepted for LT3595EUHH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3595EUHH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3595EUHH#PBF?
LT3595EUHH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3595EUHH#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 LT3595EUHH#PBF?
For technical support, including LT3595EUHH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3595EUHH#PBF requirements.
6.How does Aetrix verify that LT3595EUHH#PBF is sourced from the original manufacturer or authorized distributors?
All LT3595EUHH#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 LT3595EUHH#PBF meets industry standards.
7.What is the process for return or replacement of LT3595EUHH#PBF?
All LT3595EUHH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3595EUHH#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 LT3595EUHH#PBF part is unused and in its original packaging.
Return procedure for LT3595EUHH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3595EUHH#PBF Tags
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