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Analog Devices Inc. LT3590EDC#TRPBF
- Part No.:
- LT3590EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LT3590EDC#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM 80MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
LT3590EDC#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode buck LED driver IC designed to drive up to 10 white LEDs in series from a 48V DC source. It integrates an 80mA/55V power switch, internal Schottky diode, and 3.3V LDO regulator. Key confirmed parameters: 4.5V–55V input range, 50mA max LED current, 850kHz switching frequency, 200mV ±5% feedback voltage, and 91% efficiency at 10 LEDs/50mA - used in traffic signage and LED fixed signage requiring uniform brightness without ballast resistors.
For engineers reviewing the LT3590EDC#TRPBF datasheet, LT3590EDC#TRPBF pinout, LT3590EDC#TRPBF application, or LT3590EDC#TRPBF equivalent, this page delivers verified package mapping (6-lead 2mm × 2mm DFN), terminal functions (SW, GND, CTRL, LED, VIN, VREG), thermal design guidance (exposed pad = GND), and real-world dimming/shutdown behavior via the single CTRL pin - all critical for layout validation and LED string stability in high-reliability outdoor lighting.
Technical Context
The LT3590EDC#TRPBF employs a constant-frequency current-mode control architecture with an internal 850kHz oscillator, enabling stable regulation across wide input (4.5V–55V) and output voltage ranges. Its error amplifier compares the sensed (VIN–VLED) voltage against a programmable reference set by the CTRL pin (0–1.5V), directly scaling LED current from 0 to 50mA.
It features integrated protection including 15μA shutdown quiescent current, 500μA operating quiescent current (no switching), and thermal shutdown. The device operates over –40°C to +85°C junction temperature, with the exposed pad thermally tied to PCB ground to achieve θJA = 65°C/W to 85°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports industrial 48V rail and tolerates transients up to absolute max rating. |
| Max LED Current | 50mA - enables uniform brightness across 10-series white LEDs without external ballast resistors. |
| Switch Rating | 80mA, 55V - handles peak inductor current and LED string open-circuit conditions safely. |
| Feedback Voltage | 200mV ±5% - sets precise LED current via external sense resistor (e.g., 4Ω for 50mA). |
| Switching Frequency | 850kHz (typ) - allows use of compact 470μH inductors and low-profile ceramic capacitors. |
| CTRL Pin Function | Analog dimming & shutdown - 0–100mV disables switching; 0–1.5V linearly scales LED current from 0–100%. |
| Integrated LDO | 3.3V/1mA VREG output - powers external microcontrollers or sensors; remains active during shutdown. |
Pinout & Package
LT3590EDC#TRPBF uses a 6-lead plastic DFN package (2mm × 2mm), with exposed thermal pad soldered to PCB ground. Pin 1 marked by bar; top view orientation per LTC DWG #05-08-1703.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power Switch Drain | Connects to inductor; high dv/dt node - minimize trace area to reduce EMI. |
| GND (Pins 2, 3, 4) | Ground Return Paths | All three pins must be soldered directly to local ground plane for thermal and EMI performance. |
| CTRL (Pin 5) | Dimming & Shutdown Control | 0–100mV = shutdown; 0–1.5V = proportional LED current control; bias current <100nA. |
| LED (Pin 6) | LED String Anode Sense | High-side current sense node - connect to anode of highest LED and sense resistor. |
| VIN (Pin 7) | Main Input Supply | Bypass with ≥1μF ceramic capacitor close to pin; supports 4.5V–55V operation. |
| VREG (Pin 8) | 3.3V Regulated Output | Supplies up to 1mA; requires 0.1μF X5R capacitor to ground; active in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Single-pin analog dimming & shutdown | CTRL pin eliminates need for separate enable/dimming circuitry - reduces BOM count and layout complexity. |
| Integrated Schottky diode | Eliminates external catch diode - saves board space and improves efficiency in compact signage designs. |
| Internal 3.3V LDO (VREG) | Enables self-powered system monitoring - e.g., microcontroller wake-up on fault detection without auxiliary supply. |
| Low shutdown current (15μA) | Supports energy-sensitive applications like solar-powered traffic signs - extends battery or capacitor hold-up time. |
| Thermally enhanced DFN | Exposed pad + multiple GND pins achieve θJA ≤85°C/W - sustains 50mA LED current in sealed enclosures. |
Applications
| Traffic Signs | LED Fixed Signage |
|---|---|
Use Scenario: Outdoor variable-message traffic signs powered from 48V PoE or battery-backed DC rails. IC Role / Device Role / Timing Role: Constant-current buck driver regulating 10-series white LEDs for consistent luminance under varying ambient temperatures. Use Value: Eliminates brightness drift across LED strings; 91% efficiency minimizes heat buildup in sealed aluminum housings. | Use Scenario: Commercial building lobby signage with programmable brightness and remote fault reporting. IC Role / Device Role / Timing Role: Primary LED current controller with VREG powering an I²C sensor hub for temperature and open-circuit detection. Use Value: Single CTRL pin enables smooth 0–100% dimming via DAC; 15μA shutdown supports scheduled night-mode power reduction. |
| Neon Sign Replacement | Industrial Control Panels |
Use Scenario: Retrofitting legacy neon tube displays with energy-efficient LED modules in factory environments. IC Role / Device Role / Timing Role: High-voltage buck driver supporting 40–50V LED strings while rejecting 48V rail noise from nearby motor drives. Use Value: 55V switch rating and internal Schottky withstand industrial transients; 850kHz switching avoids audible noise in quiet zones. | Use Scenario: Operator interface panels in hazardous locations requiring intrinsically safe LED indicators. IC Role / Device Role / Timing Role: Isolated LED driver stage where VREG powers optocoupler bias, and CTRL accepts 0–5V PLC analog output. Use Value: 4.5V min input enables operation during brownouts; 200mV feedback tolerance ensures ±5% LED current accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3474EFE#TRPBF | 36V max input, 1A LED current, TSSOP-16E package; no integrated Schottky; requires external diode. | Better suited for lower-voltage, higher-current LED arrays (e.g., 5–12V systems); lacks 48V compatibility. | Select when driving >100mA strings from ≤36V supplies and board space permits external diode placement. |
| LT3518EMSE#TRPBF | 30V max input, 2.3A LED current, 4mm × 4mm QFN; no integrated Schottky; higher switching frequency (2.5MHz). | Targeted at high-current, multi-string automotive or display backlighting - not rated for 48V operation. | Choose for high-power RGB LED systems requiring PWM dimming fidelity >3,000:1, but verify input voltage compliance. |
Compared with LT3590EDC#TRPBF, LT3474EFE#TRPBF trades 48V capability for higher current and larger footprint, while LT3518EMSE#TRPBF sacrifices input voltage range for ultra-high current and faster transient response - neither matches the LT3590EDC#TRPBF's optimized 48V/10-LED/DFN integration for signage.
Availability
LT3590EDC#TRPBF is available at Aetrix Electronics and suitable for traffic signs, LED fixed signage, neon sign replacement, and industrial control panels requiring stable component supply, long-lifecycle support, and guaranteed thermal performance in sealed enclosures.
Supply support for LT3590EDC#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; Linear pioneered high-performance analog ICs for power management, signal conditioning, and precision timing.
The LT3590EDC#TRPBF belongs to Linear's LED driver product line, engineered specifically for high-voltage, constant-current LED string regulation in outdoor and industrial signage - emphasizing thermal robustness, analog dimming simplicity, and minimal external component count.
FAQ
What is the maximum LED string voltage supported by the LT3590EDC#TRPBF?
The LT3590EDC#TRPBF supports LED string voltages up to 55V (absolute max LED pin rating), enabling configurations such as 10 white LEDs (3.2V each = 32V) plus margin. Its 80mA/55V internal switch and 4.5V–55V input range make it ideal for 48V-fed signage. Always ensure (VIN − VLED) ≥ 200mV for regulation - verified in Electrical Characteristics Table.
How does the CTRL pin function for dimming and shutdown in the LT3590EDC#TRPBF?
The CTRL pin on the LT3590EDC#TRPBF serves dual roles: pulling below 100mV shuts down switching (15μA quiescent current), while ramping from 0V to 1.5V linearly scales the 200mV feedback reference to adjust LED current from 0 to 50mA. This eliminates need for external DACs or PWM filters - confirmed in Typical Performance Characteristic Figure G09 and Applications Information section.
Can the LT3590EDC#TRPBF drive fewer than 10 LEDs, and what happens in low-LED-count operation?
Yes, the LT3590EDC#TRPBF can drive 1–10 LEDs. With ≤3 LEDs, pulse-skipping may occur if (VLED + sense drop) <15% of VIN, causing low-frequency ripple - but average LED current remains regulated. Discontinuous conduction mode begins below ~10mA, with inductor current reaching zero; ringing is harmless and damped per Figure F02. Verified in Operation section (page 7).
What is the role of the VREG pin on the LT3590EDC#TRPBF, and how should it be decoupled?
The VREG pin on the LT3590EDC#TRPBF provides a regulated 3.3V output (±5%, 1mA max) for powering external logic or sensors - and remains active during shutdown. It must be decoupled with a 0.1μF X5R ceramic capacitor placed directly between VREG and GND, as specified in PIN FUNCTIONS (page 6) and Applications Information (page 11). Failure to bypass causes instability in the internal regulator.
Is thermal management critical for the LT3590EDC#TRPBF, and how is it implemented?
Yes - thermal management is critical. The LT3590EDC#TRPBF's exposed pad (pin 7) is electrically and thermally connected to GND and must be soldered to a PCB ground plane to achieve rated θJA (65°C/W to 85°C/W). Without proper soldering, junction temperature exceeds 125°C under 50mA load - confirmed in Package Description (page 14) and Absolute Maximum Ratings (page 2).
LT3590EDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 55V
- Voltage - Output:
- 55V
- Current - Output / Channel:
- 80mA (Switch)
- Frequency:
- 850kHz
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LT3590EDC#TRPBF FAQ
1.How can I place an order for LT3590EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3590EDC#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 LT3590EDC#TRPBF reliable?
The price and inventory of LT3590EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3590EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3590EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3590EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3590EDC#TRPBF?
LT3590EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3590EDC#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 LT3590EDC#TRPBF?
For technical support, including LT3590EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3590EDC#TRPBF requirements.
6.How does Aetrix verify that LT3590EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3590EDC#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 LT3590EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3590EDC#TRPBF?
All LT3590EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3590EDC#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 LT3590EDC#TRPBF part is unused and in its original packaging.
Return procedure for LT3590EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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