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Analog Devices Inc. LT3595EUHH#TRPBF
- Part No.:
- LT3595EUHH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 56-WFQFN Exposed Pad
- Datasheet:
-
LT3595EUHH#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 50MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
LT3595EUHH#TRPBF from Analog Devices (formerly Linear Technology) is a 16-channel buck-mode LED driver IC designed to deliver precise, matched current to high-brightness LED strings in large-area displays. It supports up to 10 LEDs per channel at 50mA, features internal 100mA/45V power switches and Schottky diodes, operates at 2MHz switching frequency, and achieves 8% relative current matching across all channels - enabling uniform brightness in video billboards and stadium displays.
For engineers reviewing the LT3595EUHH#TRPBF datasheet, LT3595EUHH#TRPBF pinout, LT3595EUHH#TRPBF application, or LT3595EUHH#TRPBF equivalent, this page delivers verified technical context, real-world dimming performance (5000:1 True Color PWM), package-validated pin functions, and confirmed alternatives for display backlighting and signage systems requiring stable multi-string current regulation.
Technical Context
The LT3595EUHH#TRPBF implements a fixed-frequency (1.6–2.4 MHz), current-mode buck architecture shared across 16 independent channels, each with dedicated SW and L pins. Its internal V-I converter, oscillator, and 3.3V VREG drive identical control loops, enabling synchronized PWM dimming with synchronized rising edges and asynchronous falling edges.
Each channel integrates a 100mA/45V NPN switch, on-chip Schottky diode, and current-sense circuitry referenced to an external RSET resistor. Open-LED fault detection pulls the OPENLED pin low, while shutdown is controlled via SHDN pin threshold (0.4V low / 1.6V high), and all 16 PWM inputs accept standard logic-level signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and signage DC supplies without external pre-regulation. |
| Max LED Current per Channel | 50mA - set precisely via RSET (e.g., 30.1kΩ yields 50mA); enables driving 10× 3.5V LEDs at full brightness. |
| Relative Current Matching | ±8% at 20mA - ensures consistent luminance across 16 independent LED strings without per-channel calibration. |
| PWM Dimming Range | 5000:1 at 100Hz - minimum on-time of 2μs enables deep dimming for high-contrast video content. |
| Switching Frequency | 2MHz typical - allows use of compact 100μH inductors and 0.47μF ceramic output capacitors per channel. |
| Thermal Protection | Integrated junction temperature monitoring - shuts down above 125°C to prevent thermal runaway in enclosed displays. |
| Efficiency | 92% typical - reduces heat generation and power loss in high-density LED arrays (e.g., 160-LED billboard at 50mA). |
Pinout & Package
LT3595EUHH#TRPBF is housed in a 56-pin plastic QFN package measuring 5mm × 9mm × 0.75mm, with exposed pad (Pin 57) soldered to PCB ground for thermal and electrical integrity. Pin layout supports 16 independent buck channels, dual VIN inputs, and dedicated control/sense terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| L1–L16 | LED Anode Connection | High-side node for each LED string; connects to anode of topmost LED - must be routed away from noisy SW nodes. |
| SW1–SW16 | Switch Node | Drain of internal NPN switch; connects directly to inductor - minimize trace area to reduce EMI radiation. |
| 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 | Dimming Control Input | Logic-level enable for each channel; rising edge initiates conduction - all 16 require synchronized timing. |
| RSET (Pin 51) | Current Reference | Sets master LED current via ILED = 1.21 × 1240 / RSET; 1% tolerance resistor recommended for accuracy. |
| OPENLED (Pin 23) | Fault Reporting Output | Open-collector signal pulled low if any channel detects open LED - also serves as "power OK" during startup. |
| SHDN (Pin 24) | Global Enable | Active-high shutdown control; device enabled above 1.6V, disabled below 0.4V - supports system-level power sequencing. |
| VCC (Pin 52) | Bias Supply | 3.3V ±10% internal regulator input; requires local 10μF bypass and must not exceed 6V absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| 16 independent buck regulators | Enables simultaneous, isolated current control across 16 LED strings - eliminates cross-talk and simplifies layout for modular display designs. |
| Internal 100mA/45V switches + Schottky diodes | Removes need for 32 external discrete components per board - reduces BOM count, footprint, and assembly cost in high-channel-count systems. |
| 8% relative current match at 20mA | Guarantees visual uniformity across large panels without per-channel trimming - critical for commercial video walls and broadcast signage. |
| 5000:1 True Color PWM dimming | Maintains color fidelity across full brightness range by preserving LED forward voltage characteristics - avoids grayscale distortion in RGB applications. |
| Open-LED detection with OPENLED pin | Provides fail-safe monitoring for field-deployed displays - enables automatic fault logging or graceful degradation (e.g., dim adjacent zones). |
Applications
| LED Video Billboards | LCD Television Backlighting |
|---|---|
|
Use Scenario: Outdoor digital signage with 160+ LEDs arranged in 16 parallel strings of 10 high-brightness white LEDs. IC Role / Device Role / Timing Role: Primary constant-current source for each string; regulates current independently while accepting synchronized PWM commands for frame-based brightness control. Use Value: Delivers uniform luminance and 5000:1 contrast ratio under variable ambient lighting - validated at 45V input and 50mA per string. |
Use Scenario: Edge-lit LCD TV backlight using 16 localized zones for local dimming, each driving 3–5 LEDs. IC Role / Device Role / Timing Role: Zone-specific current driver with per-zone PWM dimming; interfaces with display controller via 16 GPIO lines. Use Value: Enables dynamic contrast enhancement without color shift - leverages 8% current matching and 2MHz switching to avoid visible ripple in motion scenes. |
| Stadium Scoreboard Displays | Advertising Digital Signage |
|
Use Scenario: Large-format scoreboard with red/green/blue LED modules, each requiring matched current across multiple strings per color. IC Role / Device Role / Timing Role: Multi-channel current sink for RGB sub-pixel strings; OPENLED pin feeds fault status to central controller. Use Value: Ensures consistent color point across thousands of pixels - validated with 3-LED-per-channel configuration at 20mA and 15V input. |
Use Scenario: Indoor retail signage with narrow bezel requirements, using 16-channel driver to minimize PCB area versus discrete solutions. IC Role / Device Role / Timing Role: Compact, integrated LED driver replacing 16x boost/buck controllers; RSET sets global current reference. Use Value: Reduces board space by >60% vs discrete implementation while maintaining thermal performance - supported by 0.75mm profile QFN package. |
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#TRPBF | Dual 1.5A step-down LED driver; 3000:1 dimming; TSSOP-20E package; no integrated Schottky diodes. | Lower channel count (2 vs 16); higher per-channel current; requires external diodes and more external components per channel. | Preferred when fewer, higher-current strings are needed and board space permits discrete diode placement. |
| LT3518EMSE#TRPBF | Single-channel 1.3A LED driver; 3000:1 True Color PWM; 4mm × 4mm QFN-16; supports up to 42V output. | Not multi-channel - requires 16 separate ICs for equivalent functionality; lacks OPENLED fault reporting per string. | Only suitable for redesigns where channel independence is less critical and thermal management favors distributed drivers. |
Compared with LT3595EUHH#TRPBF, LT3475EFE#TRPBF offers higher per-channel current but halves channel density and increases component count, while LT3518EMSE#TRPBF sacrifices integration and fault visibility for higher single-string capability - making LT3595EUHH#TRPBF uniquely suited for space-constrained, high-channel-count signage.
Availability
LT3595EUHH#TRPBF is available at Aetrix Electronics and suitable for LED video billboards, LCD television backlighting, and stadium display systems requiring stable component supply, long-term production continuity, and guaranteed lead-free compliance.
Supply support for LT3595EUHH#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 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3595 series.
The LT3595EUHH#TRPBF belongs to Linear's high-performance LED driver product line, engineered specifically for large-area, multi-string display applications demanding precision current matching, wide dimming range, and integrated power stage reliability.
FAQ
What is the maximum number of LEDs the LT3595EUHH#TRPBF can drive per channel?
The LT3595EUHH#TRPBF supports up to 10 LEDs per channel when operated at 20mA, based on its 45V maximum Lx pin voltage rating and typical 3.5V forward voltage per white LED. At 50mA, the practical limit reduces to ~7 LEDs due to increased voltage drop across internal switch and Schottky diode - confirmed by the 15V–45V input range and duty cycle constraints in the datasheet.
Does the LT3595EUHH#TRPBF require external Schottky diodes?
No, the LT3595EUHH#TRPBF integrates Schottky diodes internally - explicitly stated in the FEATURES section and confirmed by the "Internal Schottky Diodes" bullet and block diagram. This eliminates 16 external diodes, reducing BOM count and PCB area. The diode forward drop is specified at 0.8V @ 50mA, and leakage is ≤4μA at 45V.
How is LED current set on the LT3595EUHH#TRPBF?
LED current is set globally for 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 per channel. The datasheet provides exact RSET values for 10–50mA and specifies 1% tolerance resistors to maintain the ±8% current matching spec of the LT3595EUHH#TRPBF.
What is the purpose of the two VIN pins on the LT3595EUHH#TRPBF?
The LT3595EUHH#TRPBF has two VIN pins (Pins 5 and 14) to handle high input current and reduce trace resistance/IR drop. Both must be tied together and individually bypassed with ≥10μF ceramic capacitors close to each pin. This dual-pin design improves thermal dissipation and power integrity - critical for stable operation across the 4.5V–45V input range and under full 16-channel load conditions.
Can the LT3595EUHH#TRPBF operate in discontinuous conduction mode (DCM)?
Yes, the LT3595EUHH#TRPBF operates in DCM at low LED currents (e.g., 10mA) or low LED counts, as documented in the "Discontinuous Current Mode" section. In DCM, inductor current reaches zero during the off-time, causing SW pin ringing - which is non-harmful and spectrally benign. The device maintains average current regulation down to 10mA, though pulse-skipping may occur below 15% LED string voltage relative to VIN.
LT3595EUHH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 56-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT3595EUHH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3595EUHH#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 LT3595EUHH#TRPBF reliable?
The price and inventory of LT3595EUHH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3595EUHH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3595EUHH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3595EUHH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3595EUHH#TRPBF?
LT3595EUHH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3595EUHH#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 LT3595EUHH#TRPBF?
For technical support, including LT3595EUHH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3595EUHH#TRPBF requirements.
6.How does Aetrix verify that LT3595EUHH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3595EUHH#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 LT3595EUHH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3595EUHH#TRPBF?
All LT3595EUHH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3595EUHH#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 LT3595EUHH#TRPBF part is unused and in its original packaging.
Return procedure for LT3595EUHH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3595EUHH#TRPBF Tags
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