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Analog Devices Inc. LT3590ESC8#TRPBF
- Part No.:
- LT3590ESC8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-VFSOP (0.049", 1.25mm Width)
- Datasheet:
-
LT3590ESC8#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 80MA SC70-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,106
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Product details
Overview
LT3590ESC8#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 high-reliability signage applications requiring uniform brightness without ballast resistors.
For engineers reviewing the LT3590ESC8#TRPBF datasheet, LT3590ESC8#TRPBF pinout, LT3590ESC8#TRPBF application, or LT3590ESC8#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world dimming behavior, thermal design constraints for SC70, and validated alternative options for LED string driving in industrial signage and traffic systems.
Technical Context
The LT3590ESC8#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 VIN–VLED against a CTRL-programmable reference (0–200mV), directly setting peak inductor current to regulate LED current.
It features integrated protection including 15μA shutdown quiescent current, 500μA no-switching operating current, and thermal shutdown. The SC70-8 package includes an exposed ground pad requiring PCB soldering for θJA = 75°C/W to 95°C/W thermal performance - critical for continuous 50mA operation in enclosed signage enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports 48V industrial rails and tolerates transients up to absolute max rating. |
| Max LED Current | 50mA - enables uniform brightness across 10-series white LEDs without external ballast. |
| Switch Rating | 80mA, 55V - handles peak currents during startup and transient load steps in high-VF LED strings. |
| Feedback Voltage | 200mV ±5% - sets LED current via external sense resistor (e.g., 4Ω for 50mA); low tolerance minimizes current variation. |
| Switching Frequency | 850kHz (typ) - allows use of compact 470μH inductors and 1μF ceramic output capacitors. |
| CTRL Function | Single-pin dimming & shutdown - 0–1.5V analog control linearly scales LED current; <100mV disables switching. |
| Efficiency | 91% @ 10 LEDs, 50mA - reduces thermal load in space-constrained SC70-based designs. |
Pinout & Package
LT3590ESC8#TRPBF uses an 8-lead plastic SC70 package (JEDEC MO-203 variation BA) with exposed pad (Pin 7) tied to GND. Thermal performance requires soldering the exposed pad to PCB ground plane.
| 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 (Pin 2) | Ground Reference | Main signal ground; tie directly to local ground plane for stable feedback and thermal path. |
| GND (Pin 3) | Ground Reference | Secondary ground pin - must be connected to same ground plane as Pin 2. |
| GND (Pin 4) | Ground Reference | Third ground pin - ensures low-impedance return for internal circuitry and thermal conduction. |
| VIN (Pin 8) | Input Supply | 4.5V–55V input; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| LED (Pin 7) | LED Anode Sense | Connects to anode of highest LED in string; forms VIN–VLED sense node for current regulation. |
| VREG (Pin 6) | 3.3V LDO Output | Supplies up to 1mA for external logic; requires 0.1μF X5R capacitor to ground. |
| CTRL (Pin 5) | Dimming & Shutdown Control | Analog dimming input (0–1.5V) and shutdown trigger (<100mV); bias current <100nA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external catch diode - reduces BOM count and board area in SC70 footprint. |
| Single-Pin Dimming/Shutdown | Reduces system wiring complexity - one analog voltage controls both brightness and on/off state. |
| Internal 3.3V LDO Regulator | Provides regulated supply for microcontrollers or sensors - remains active during shutdown. |
| Low Shutdown Quiescent Current | 15μA max - preserves battery life in intermittently powered signage or emergency lighting. |
| Fixed 850kHz Switching | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency noise spread. |
Applications
| LED Fixed Signage | Traffic Signs |
|---|---|
Use Scenario: Indoor/outdoor alphanumeric LED signs powered from 48V DC distribution rails. IC Role / Device Role / Timing Role: Constant-current buck controller regulating 10-series white LED strings for uniform luminance. Use Value: Eliminates ballast resistors and ensures ±5% LED current matching across all segments - critical for consistent color and brightness. | Use Scenario: Red/amber/green traffic signal modules requiring high reliability and thermal stability. IC Role / Device Role / Timing Role: Primary LED driver delivering 50mA to high-VF red LEDs under wide ambient temperature (-40°C to +85°C). Use Value: 91% efficiency and integrated thermal management enable fanless operation in sealed pole-mounted housings. |
| Neon Sign Replacement | Industrial Panel Indicators |
Use Scenario: Retrofitting legacy neon tubing with flexible LED strips in architectural lighting. IC Role / Device Role / Timing Role: High-voltage buck driver powering long LED strings (up to 36V VF) from 48V bus. Use Value: 55V switch rating and 4.5V minimum input support direct integration with existing 48V infrastructure - no additional converters needed. | Use Scenario: Status indicators on industrial HMIs and control panels with 24V/48V backplanes. IC Role / Device Role / Timing Role: Low-noise, dimmable LED driver supporting PWM or analog brightness control. Use Value: Direct PWM dimming capability (≥80Hz) maintains LED chromaticity - essential for color-coded safety indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3474EFE#PBF | 36V max input, 1A LED current, TSSOP-16E package; no integrated Schottky. | Targets lower-input, higher-current applications (e.g., automotive 12V/24V); requires external diode. | Select when >50mA current or <36V input is required; not drop-in due to different pinout and external diode need. |
| LT3518EFE#PBF | 30V max input, 2.3A LED current, 4mm×4mm QFN-16; no integrated Schottky or VREG. | Designed for high-current RGB LED drivers; lacks onboard 3.3V regulator and single-wire dimming. | Choose for multi-channel or high-power LED arrays; incompatible pinout and missing VREG limit direct substitution. |
Compared with LT3590ESC8#TRPBF, LT3474EFE#PBF supports higher LED current but requires external components and operates at lower input voltage, while LT3518EFE#PBF offers greater current capacity in a larger package but omits integrated diode and regulator - making LT3590ESC8#TRPBF uniquely suited for compact, self-contained 48V signage designs.
Availability
LT3590ESC8#TRPBF is available at Aetrix Electronics and suitable for LED fixed signage, traffic signs, neon sign replacement, and industrial panel indicators requiring stable component supply, long-lifecycle availability, and guaranteed parametric performance over –40°C to +85°C.
Supply support for LT3590ESC8#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 the LT® portfolio.
The LT3590ESC8#TRPBF belongs to Linear's precision LED driver product line, engineered specifically for high-efficiency, constant-current driving of medium-to-high VF LED strings in industrial signage and transportation applications.
FAQ
What is the maximum number of LEDs the LT3590ESC8#TRPBF can drive in series?
The LT3590ESC8#TRPBF is specified to drive up to 10 white LEDs in series from a 48V source. This assumes typical forward voltages of ~3.2V per LED (32V total), leaving sufficient headroom for the 200mV sense voltage and internal switch/Schottky drops. Driving more than 10 LEDs risks exceeding the 55V absolute maximum LED voltage rating or violating the 90% maximum duty cycle limit.
Does the LT3590ESC8#TRPBF require an external Schottky diode?
No, the LT3590ESC8#TRPBF integrates a Schottky diode internally - confirmed in the Features section and Absolute Maximum Ratings table. This eliminates the need for an external catch diode, reducing bill-of-materials count and PCB area, especially critical in the compact SC70-8 footprint.
What is the purpose of the VREG pin on the LT3590ESC8#TRPBF?
The VREG pin on the LT3590ESC8#TRPBF provides a regulated 3.3V output capable of sourcing up to 1mA. It remains active during shutdown and is intended to power external circuitry such as microcontrollers or sensors. A 0.1μF X5R capacitor must be placed locally between VREG and GND for stability.
How does dimming work on the LT3590ESC8#TRPBF?
Dimming on the LT3590ESC8#TRPBF is controlled via the CTRL pin: applying 0–1.5V linearly scales the LED current from 0 to full scale (e.g., 50mA), while voltages above 1.5V maintain full current. Voltages below 100mV disable the switcher entirely. The device also supports direct PWM dimming by applying a PWM signal to CTRL, preserving LED color fidelity.
What thermal considerations apply to the LT3590ESC8#TRPBF in SC70-8 package?
The LT3590ESC8#TRPBF in SC70-8 has θJA = 75°C/W to 95°C/W depending on PCB layout. To achieve rated thermal performance, the exposed pad (Pin 7) must be soldered to a solid PCB ground plane. Without proper thermal anchoring, junction temperature rise may exceed 125°C under 50mA continuous load - risking thermal shutdown or reduced lifetime.
LT3590ESC8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-VFSOP (0.049", 1.25mm Width)
- 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:
- SC-70-8
LT3590ESC8#TRPBF FAQ
1.How can I place an order for LT3590ESC8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3590ESC8#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 LT3590ESC8#TRPBF reliable?
The price and inventory of LT3590ESC8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3590ESC8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3590ESC8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3590ESC8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3590ESC8#TRPBF?
LT3590ESC8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3590ESC8#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 LT3590ESC8#TRPBF?
For technical support, including LT3590ESC8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3590ESC8#TRPBF requirements.
6.How does Aetrix verify that LT3590ESC8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3590ESC8#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 LT3590ESC8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3590ESC8#TRPBF?
All LT3590ESC8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3590ESC8#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 LT3590ESC8#TRPBF part is unused and in its original packaging.
Return procedure for LT3590ESC8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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