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Analog Devices Inc. LT3590ESC8#TRMPBF
- Part No.:
- LT3590ESC8#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-VFSOP (0.049", 1.25mm Width)
- Datasheet:
-
LT3590ESC8#TRMPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 80MA SC70-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,510
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Product details
Overview
LT3590ESC8#TRMPBF 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 in an 8-lead SC70 package. Key confirmed parameters: 4.5V–55V input range, 50mA max LED current, 850kHz switching frequency, 200mV feedback voltage (±5%), and 91% efficiency at 10 LEDs/50mA - used in high-reliability signage and traffic signal illumination.
For engineers reviewing the LT3590ESC8#TRMPBF datasheet, LT3590ESC8#TRMPBF pinout, LT3590ESC8#TRMPBF application, or LT3590ESC8#TRMPBF equivalent, this page delivers verified technical context, exact pin functions, real-world dimming behavior, thermal design guidance for SC70 layout, and validated alternative options for LED driver selection across 24–48V industrial lighting systems.
Technical Context
The LT3590ESC8#TRMPBF 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 programmable reference set by the CTRL pin, directly controlling peak inductor current via PWM duty cycle modulation.
It features integrated protection including 15μA shutdown quiescent current, 500μA operating quiescent current (no switching), and thermal shutdown. The device supports three dimming methods: analog DC voltage, filtered PWM, and direct PWM - with CTRL pin thresholds of 100mV (shutdown), 150mV (startup), and ≥1.5V (full-scale 200mV sense reference).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports 24V/48V industrial rails and tolerates transient overvoltage up to absolute max rating. |
| Max LED Current | 50mA - sets maximum string current via external sense resistor (R1 = 4Ω for full scale), ensuring uniform brightness without ballast resistors. |
| Switching Frequency | 850kHz (typ) - enables use of compact 470μH inductors and low-profile ceramic capacitors (1μF output, 0.1μF VREG bypass). |
| Feedback Voltage | 200mV ±5% - precise current-sense reference enabling accurate LED current regulation independent of temperature and supply variation. |
| CTRL Pin Function | Single-pin dimming & shutdown - 0–1.5V linear analog control; ≤100mV disables switching; ≥150mV enables operation. |
| Integrated Features | 80mA/55V DMOS switch + internal Schottky diode + 3.3V/1mA LDO - eliminates 3 external components and reduces board area in SC70 footprint. |
| Efficiency | 91% at 10 white LEDs, 50mA, VIN=48V - achieved via low RDS(on) switch, low forward-drop Schottky, and optimized gate drive. |
Pinout & Package
LT3590ESC8#TRMPBF uses the 8-lead plastic SC70 package (JEDEC MO-203 variation BA), with exposed pad (Pin 7) electrically connected to GND and required to be soldered to PCB ground for thermal performance (θJA = 75–95°C/W). Pin 1 marked by bar; top-view orientation per LTC DWG #05-08-1639 Rev Ø.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Power Switch Drain | Connects to inductor; high dv/dt node requiring minimal trace area to reduce EMI and ringing. |
| GND (Pins 2, 3, 4) | Ground Return Paths | All must tie directly to local ground plane; Pins 2–4 are dedicated GND pins for low-impedance return and thermal conduction. |
| VIN (Pin 8) | Main Input Supply | Bypass locally with 1μF ceramic capacitor; handles 4.5–55V input with internal overvoltage clamp. |
| LED (Pin 7) | LED String Anode Sense | High-side current sense node; connects to anode of highest LED and sense resistor - sensitive to noise, keep away from SW. |
| VREG (Pin 6) | 3.3V Regulated Output | Supplies up to 1mA for external circuitry; requires mandatory 0.1μF X5R capacitor to GND for stability. |
| CTRL (Pin 5) | Dimming & Shutdown Control | Analog input (0–1.5V) setting LED current; ≤100mV forces shutdown; bias current <100nA minimizes loading. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky Diode | Eliminates external catch diode, reducing BOM count and PCB area while maintaining 0.8V forward drop at 50mA. |
| Single-Pin Dimming Interface | CTRL pin provides seamless transition between analog dimming (0–1.5V) and digital shutdown (<100mV), simplifying system-level brightness control. |
| Internal 3.3V LDO Regulator | Delivers regulated 3.3V/1mA even during shutdown - powers microcontrollers or sensors without additional regulators. |
| Low Quiescent Current | 15μA shutdown current and 500μA no-switching operating current enable energy-efficient standby in always-on signage. |
| SC70 Thermal Design | Exposed pad (Pin 7) tied to GND ensures θJA ≤95°C/W; mandatory soldering to PCB ground plane required for rated thermal performance. |
Applications
| LED Fixed Signage | Traffic Signs |
|---|---|
Use Scenario: Outdoor alphanumeric LED signs powered from 48V telecom or PoE-derived supplies, requiring consistent brightness across 10-LED strings. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current via VIN–VLED sensing; operates at 850kHz to minimize EMI in dense sign cabinets. Use Value: Eliminates ballast resistors and external diodes, reducing component count and thermal stress while delivering 91% efficiency at full load. | Use Scenario: Red/amber/green traffic signal modules using 10-white-LED arrays for daylight-visible indicators, powered from 24V vehicle or municipal DC rails. IC Role / Device Role / Timing Role: High-voltage buck LED driver with robust 55V switch rating and 15μA shutdown current for battery-backed operation during grid outages. Use Value: Maintains uniform LED current across temperature (–40°C to +85°C) and input variation (24–48V), ensuring regulatory-compliant luminance consistency. |
| Neon Sign Replacement | Industrial Panel Lighting |
Use Scenario: Retrofitting legacy neon tubing with flexible LED strips in architectural façades, where long strings (10 LEDs) run from centralized 48V distribution. IC Role / Device Role / Timing Role: Series-string LED driver with internal Schottky and 850kHz switching, enabling compact, fanless enclosures with low-profile magnetics. Use Value: Achieves >90% efficiency with only 1μF output capacitance, reducing heat generation and extending lifetime in sealed outdoor housings. | Use Scenario: Backlighting for HMI panels in factory automation equipment, requiring adjustable brightness and reliable operation in vibration-prone environments. IC Role / Device Role / Timing Role: Dimmable LED driver supporting both analog (0–1.5V CTRL) and direct PWM dimming up to 10kHz, preserving LED chromaticity. Use Value: Enables flicker-free, color-stable dimming down to <50μA average current using hybrid analog+PWM control - critical for operator visual comfort. |
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; lacks integrated Schottky and VREG LDO. | Targeted at lower-input-voltage, higher-current applications (e.g., automotive interior lighting); requires external diode and bias supply. | Select when driving >100mA strings from ≤36V rails and board space allows larger TSSOP footprint. |
| LT3518EMSE#PBF | 30V max input, 2.3A LED current, 4×4mm QFN-16; includes True Color PWM dimming but no integrated Schottky or VREG. | Optimized for high-current, multi-string RGB applications with 3,000:1 dimming ratio; not suitable for 48V signage due to lower VIN rating. | Choose for high-brightness industrial displays needing >1A per channel and ultra-deep analog+PWM dimming. |
Compared with LT3590ESC8#TRMPBF, LT3474EFE#PBF offers higher current but sacrifices integration and 48V capability, while LT3518EMSE#PBF delivers superior dimming resolution and current drive at the cost of input voltage headroom and component count - making LT3590ESC8#TRMPBF optimal for space-constrained, high-VIN, moderate-current signage.
Availability
LT3590ESC8#TRMPBF is available at Aetrix Electronics and suitable for LED fixed signage, traffic signs, neon sign replacement, and industrial panel lighting requiring stable component supply, long-lifecycle support, and guaranteed SC70 packaging integrity.
Supply support for LT3590ESC8#TRMPBF 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, datasheet archives, and application engineering for legacy Linear parts including the LT3590 family.
The LT3590 belongs to Linear's high-voltage LED driver product line, engineered specifically for 24–48V industrial signage and transportation lighting where reliability, small footprint, and integrated power stage are critical.
FAQ
What is the maximum input voltage supported by the LT3590ESC8#TRMPBF?
The LT3590ESC8#TRMPBF supports an absolute maximum input voltage of 55V, with guaranteed operation from 4.5V to 55V. This makes it suitable for 48V nominal systems with transient overvoltage tolerance. Exceeding 55V may cause permanent damage, as specified in the Absolute Maximum Ratings table.
How does the CTRL pin control dimming and shutdown on the LT3590ESC8#TRMPBF?
The CTRL pin on the LT3590ESC8#TRMPBF serves dual functions: pulling it below 100mV disables switching (shutdown), while ramping it from 0V to 1.5V linearly scales the feedback reference from 0mV to 200mV, thereby controlling LED current. Above 1.5V, the reference remains fixed at 200mV for full-scale output.
Does the LT3590ESC8#TRMPBF require an external Schottky diode?
No, the LT3590ESC8#TRMPBF integrates a Schottky diode internally, eliminating the need for an external catch diode. This is confirmed in the Features list and Block Diagram, and reduces BOM count and PCB area - a key differentiator versus discrete buck controllers.
What is the purpose of the VREG pin on the LT3590ESC8#TRMPBF?
The VREG pin on the LT3590ESC8#TRMPBF provides a regulated 3.3V output capable of sourcing up to 1mA. It remains active during shutdown and must be bypassed with a 0.1μF X5R capacitor to GND. This LDO can power external logic or sensors, reducing system-level component count.
Can the LT3590ESC8#TRMPBF drive fewer than 10 LEDs?
Yes, the LT3590ESC8#TRMPBF can drive 1–10 LEDs in series. For low LED counts (e.g., 1–3), pulse-skipping may occur if VIN–VLED < ~15% of VIN, resulting in low-frequency ripple - but average LED current remains regulated. Efficiency and stability are maintained across the full range with appropriate inductor selection (220μH for VIN < 25V, 470μH for VIN > 25V).
LT3590ESC8#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT3590ESC8#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3590ESC8#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT3590ESC8#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3590ESC8#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3590ESC8#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3590ESC8#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3590ESC8#TRMPBF?
LT3590ESC8#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3590ESC8#TRMPBF 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#TRMPBF?
For technical support, including LT3590ESC8#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3590ESC8#TRMPBF requirements.
6.How does Aetrix verify that LT3590ESC8#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3590ESC8#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3590ESC8#TRMPBF?
All LT3590ESC8#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3590ESC8#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3590ESC8#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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