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Analog Devices Inc. LT3595AEUHH#TRPBF
- Part No.:
- LT3595AEUHH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 56-WFQFN Exposed Pad
- Datasheet:
-
LT3595AEUHH#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 50MA 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
LT3595AEUHH#TRPBF from Analog Devices (formerly Linear Technology) is a 16-channel buck-mode LED driver IC designed for high-brightness, uniform-current LED string control in large-area displays. It delivers up to 50mA per channel with ±4% channel-to-channel current matching, 7% LED current accuracy, and supports 3–10 LEDs per string at input voltages from 4.5V to 45V. Its 2MHz switching frequency enables compact 100μH inductors and ceramic output capacitors, making it suitable for space-constrained LED video billboards and stadium displays.
For engineers reviewing the LT3595AEUHH#TRPBF datasheet, LT3595AEUHH#TRPBF pinout, LT3595AEUHH#TRPBF application, or LT3595AEUHH#TRPBF equivalent, key selection criteria include its 56-pin QFN package thermal performance, 5000:1 True Color PWM dimming range at 100Hz, open-LED fault reporting via OPENLED pin, and RSET-programmable master current scaling across all 16 channels.
Technical Context
The LT3595AEUHH#TRPBF implements a fixed-frequency (1.6–2.4MHz), current-mode buck architecture with 16 independent synchronous switch controllers-each integrating a 100mA/45V internal NPN power switch and Schottky diode. All 16 channels share a common oscillator, V-I converter, and 3.3V internal regulator, while maintaining individual PWM comparators and dimming feedback control (DFC) blocks.
It operates in continuous conduction mode down to 15mA per string and transitions to discontinuous mode below that; pulse-skipping occurs only when LED string voltage falls below 15% of VIN. Open-LED detection is active during startup and steady-state operation, pulling OPENLED low to signal any channel fault.
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 Accuracy | ±7% - ensures consistent luminance across production units when using 1% RSET resistor. |
| Channel Matching | ±4% - guarantees uniform brightness across 16 independent LED strings without per-channel calibration. |
| Dimming Ratio | 5000:1 True Color PWM - enables flicker-free, high-fidelity grayscale control at 100Hz with 2μs minimum on-time. |
| Switching Frequency | 2MHz typical - allows use of 100μH shielded inductors and 0.47μF X5R/X7R ceramic output capacitors. |
| Internal Switch Rating | 100mA, 45V VCE(SAT) ≤ 450mV @ 50mA - minimizes conduction loss and thermal rise in high-current LED drive. |
| Package | 56-pin 5mm × 9mm × 0.75mm QFN - exposes thermal pad (Pin 57) for direct PCB soldering to manage 2.5W typical dissipation. |
Pinout & Package
LT3595AEUHH#TRPBF is housed in a thermally enhanced 56-pin plastic QFN (UHH package), measuring 5mm × 9mm × 0.75mm, with an exposed ground pad (Pin 57) requiring solder connection to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| L1–L16 | LED Anode Connection | Connects to anode of topmost LED in each string; referenced to internal current-sense node for regulation. |
| SW1–SW16 | Switch Node | Drives external inductor; requires minimal trace area to reduce EMI and ringing in discontinuous mode. |
| VIN (Pins 5, 33) | Main Power Input | 4.5V–45V supply; both pins must be shorted and locally bypassed with ≥10μF ceramic capacitor. |
| PWM1–PWM16 | Channel Dimming Input | Asynchronous falling-edge controlled; rising edges must be synchronized for multi-channel timing integrity. |
| RSET (Pin 51) | Master Current Programming | Sets all 16 channels' current via ILED = 1.21 × 1240 / RSET; 75kΩ yields 20mA typical. |
| OPENLED (Pin 23) | Fault Reporting Output | Open-drain signal pulled low if any channel detects open-circuit LED string or startup undervoltage. |
| SHDN (Pin 24) | Global Enable Control | Logic-high (>1.6V) enables operation; <0.4V forces shutdown with <40μA quiescent current. |
| VCC (Pin 52) | Bias Supply Input | 3.3V ±10% regulated supply; requires local 10μF bypass capacitor for stable internal regulator operation. |
| GND (Pins 14, 42) | Analog/Digital Ground | Low-impedance return path for sense and power circuits; must connect to exposed thermal pad (Pin 57). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diodes | Eliminates 16 external diodes, reducing BOM count, board area, and forward-drop losses in buck topology. |
| Single RSET Programming | One precision resistor sets identical current across all 16 channels-enabling scalable, repeatable LED brightness calibration. |
| Thermal Protection | Shuts down automatically above 125°C junction temperature and recovers after cooldown-prevents thermal runaway in enclosed displays. |
| LED Disconnection in Shutdown | Opens all 16 LED paths during SHDN assertion-ensures zero residual current and true off-state for safety-critical signage. |
| 1-Sided PCB Layout Support | Pinout optimized for single-layer routing of SW/L nodes-reduces layer count and manufacturing cost in high-volume display modules. |
Applications
| LED Video Billboards | LCD Television Backlight |
|---|---|
Use Scenario: Outdoor full-color digital signage with 160+ LED strings per module, operating continuously under variable ambient temperature. IC Role / Device Role / Timing Role: Primary constant-current LED driver managing 16 independent RGB subpixel strings with synchronized PWM dimming. Use Value: 5000:1 dimming range preserves deep blacks and color fidelity; ±4% matching eliminates visible column banding across large panels. |
Use Scenario: Edge-lit LCD TV backlight requiring uniform luminance across 16 vertical zones for local dimming. IC Role / Device Role / Timing Role: Zone-specific current controller delivering precise 20–50mA per string, coordinated via system MCU PWM signals. Use Value: RSET-based current scaling simplifies factory calibration; 2MHz switching avoids audible noise in consumer audio environments. |
| Stadium Scoreboards | Advertising Display Panels |
Use Scenario: High-brightness, weather-sealed scoreboard modules exposed to direct sunlight and wide thermal cycling (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with open-LED fault detection and thermal shutdown-ensuring fail-safe operation during live events. Use Value: OPENLED pin provides real-time channel health monitoring to central controller; 45V max VIN tolerates generator surges and long cable drops. |
Use Scenario: Modular indoor advertising panels with hot-swappable LED modules and centralized power distribution. IC Role / Device Role / Timing Role: Compact, high-density driver enabling 16 parallel strings per 5mm × 9mm footprint-maximizing LED count per square inch. Use Value: Integrated switches and Schottky diodes reduce component height to <0.75mm-critical for ultra-thin panel mechanical design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3590EFE#TRPBF | Single-output 48V buck LED driver; no multi-channel capability; 45V max switch rating; 700μA quiescent current. | Designed for single-string high-voltage LED arrays (e.g., automotive headlights), not multi-string display systems. | Select only when driving one high-Vf string up to 42V-not for parallel channel control or uniformity-critical displays. |
| LT3475EFE#TRPBF | Dual 1.5A outputs; 36V max VIN; 3000:1 dimming; TSSOP-20E package; no integrated Schottky diodes. | Targets high-current, low-channel-count applications (e.g., architectural lighting), lacking 16-channel granularity and layout optimization. | Choose for dual high-power strings where thermal density permits larger package; avoid when 16 independent dimming channels or QFN thermal performance are required. |
Compared with LT3595AEUHH#TRPBF, LT3590EFE#TRPBF lacks multi-channel architecture and fault reporting, while LT3475EFE#TRPBF offers higher per-channel current but halves channel count and increases PCB area-making LT3595AEUHH#TRPBF uniquely suited for high-granularity, space-constrained display drivers.
Availability
LT3595AEUHH#TRPBF is available at Aetrix Electronics and suitable for LED video billboards, stadium scoreboards, and LCD television backlighting requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3595AEUHH#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 technical and manufacturing continuity for legacy Linear products including the LT3595A family.
The LT3595A product line was engineered specifically for high-channel-count, high-uniformity LED display systems-emphasizing thermal efficiency, layout simplicity, and robust fault handling in outdoor and commercial signage applications.
FAQ
What is the maximum number of LEDs supported per channel by the LT3595AEUHH#TRPBF?
The LT3595AEUHH#TRPBF supports up to 10 LEDs per channel when driven at 20mA, assuming typical 3.5V forward voltage per LED (35V total string voltage). At lower currents (e.g., 10mA), up to 12 LEDs may be feasible depending on VIN headroom and thermal limits. The absolute maximum string voltage is constrained by the 45V absolute maximum rating on Lx pins and internal switch VCE(SAT) drop.
How does the LT3595AEUHH#TRPBF achieve 5000:1 PWM dimming ratio?
The LT3595AEUHH#TRPBF achieves 5000:1 True Color PWM dimming by supporting a 10ms maximum period (100Hz) and 2μs minimum on-time per PWM cycle. This timing window enables precise duty-cycle control down to 0.02%, preserving color consistency and eliminating flicker. The internal DFC block ensures accurate current regulation even at minimum on-time, unlike basic PWM methods that degrade linearity.
Can the LT3595AEUHH#TRPBF operate with a 3.3V-only supply, or does it require separate VIN and VCC rails?
The LT3595AEUHH#TRPBF requires two distinct supplies: VIN (4.5V–45V) powers the 16 buck converters and internal switches, while VCC (3.0V–5.5V) powers the analog control circuitry, PWM comparators, and bias regulators. VCC cannot be derived from VIN internally-the datasheet mandates a clean, locally bypassed 3.3V source (e.g., LDO) independent of the main LED supply.
What thermal management provisions are built into the LT3595AEUHH#TRPBF package?
The LT3595AEUHH#TRPBF uses a 56-pin QFN with an exposed thermal pad (Pin 57) that must be soldered directly to a large PCB copper pour. This pad serves as the primary thermal path-θJA is 31°C/W and θJC is 0.5°C/W when properly mounted. No external heatsink is needed for ≤2.5W total dissipation, but airflow or thermal vias beneath the pad improve reliability in sealed enclosures.
Is the LT3595AEUHH#TRPBF pin-compatible with the earlier LT3595 (non-A) version?
No, the LT3595AEUHH#TRPBF is not pin-compatible with the original LT3595. The LT3595A revision introduced layout optimizations-including relocated PWM pins and modified GND placement-to enable 1-sided PCB routing. Pin functions differ in several locations (e.g., PWM1–PWM4 moved from Pins 1–4 to Pins 19–22), and the maximum duty cycle increased from 75% to 85%. Migration requires board redesign.
LT3595AEUHH#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN (5x9)
LT3595AEUHH#TRPBF FAQ
1.How can I place an order for LT3595AEUHH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3595AEUHH#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 LT3595AEUHH#TRPBF reliable?
The price and inventory of LT3595AEUHH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3595AEUHH#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3595AEUHH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3595AEUHH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3595AEUHH#TRPBF?
LT3595AEUHH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3595AEUHH#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 LT3595AEUHH#TRPBF?
For technical support, including LT3595AEUHH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3595AEUHH#TRPBF requirements.
6.How does Aetrix verify that LT3595AEUHH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3595AEUHH#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 LT3595AEUHH#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3595AEUHH#TRPBF?
All LT3595AEUHH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3595AEUHH#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 LT3595AEUHH#TRPBF part is unused and in its original packaging.
Return procedure for LT3595AEUHH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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