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Analog Devices Inc. LT3519EMS#TRPBF
- Part No.:
- LT3519EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519EMS#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
LT3519EMS#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency 400kHz step-up DC/DC LED driver IC with integrated 45V/750mA low-side switch and Schottky diode. It supports constant-current and constant-voltage regulation, rail-to-rail current sense (0V–45V), programmable UVLO, open-LED fault detection, and up to 3000:1 True Color PWM™ dimming. It is used in automotive interior lighting, industrial status indicators, and high-reliability LED backlighting systems.
For engineers reviewing the LT3519EMS#TRPBF datasheet, LT3519EMS#TRPBF pinout, LT3519EMS#TRPBF application, or LT3519EMS#TRPBF equivalent, key selection criteria include switching frequency (400kHz), internal Schottky integration, rail-to-rail ISP/ISN sensing range, open-LED status reporting via OPENLED pin, and compatibility with boost/SEPIC/buck-boost/buck topologies.
Technical Context
The LT3519EMS#TRPBF employs current-mode control with internal compensation and dual-loop feedback-voltage loop (FB pin, 1.22V reference) and rail-to-rail current-sense loop (ISP/ISN pins). Its error amplifier selects the lower of the two loop demands to enforce either constant-current or constant-voltage operation without mode conflict.
It features a dedicated CTRL pin that linearly adjusts the current-sense threshold (100mV–250mV) for analog dimming, and a PWM pin enabling ultra-high-ratio (3000:1) pulse-width modulation with stored VC-node state for fast transient recovery. The SHDN/UVLO pin provides accurate 1.22V falling threshold with externally programmable hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 400kHz - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance in automotive-grade designs. |
| Internal Switch Rating | 45V VDS, 750mA ISW - supports LED strings up to ~38V output in boost mode with margin for transients. |
| Current Sense Range | Rail-to-rail 0V–45V across ISP/ISN - allows flexible placement of sense resistor in high-side, low-side, or floating configurations. |
| LED Dimming Capability | 3000:1 True Color PWM™ - preserves color fidelity during deep dimming in automotive cabin lighting and display backlighting. |
| Open LED Detection | Dedicated OPENLED pin asserts low when FB exceeds 1.16V (1.22V – 60mV) - provides fail-safe status reporting without external comparators. |
| CTRL Pin Adjustment Range | 100mV–250mV threshold (via 0.1V–1.2V input) - enables precise analog dimming and current scaling across temperature and unit variation. |
| UVLO Threshold Accuracy | 1.22V ±20mV falling threshold with programmable hysteresis - ensures reliable startup/shutdown sequencing in 12V/24V automotive systems. |
Pinout & Package
LT3519EMS#TRPBF is housed in a thermally enhanced 16-lead MSOP package (3mm × 4.9mm, 0.5mm pitch) with four GND pins (1, 8, 9, 16) for low-impedance grounding and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground reference | Four dedicated ground connections minimize ground bounce and improve thermal resistance (θJA = 130°C/W). |
| OPENLED (2) | Open-collector fault status output | Pulls low when FB ≥ 1.16V - signals open-circuit LED string; requires external pull-up for logic-level interfacing. |
| PWM (3) | Switching enable/disable control | Low disables oscillator and saves VC node state; internal pull-down allows direct MCU GPIO connection. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout input | 1.22V falling threshold with 2.2μA internal pull-down enables precise hysteresis programming via resistor divider. |
| VIN (5) | Main input supply (3V–30V continuous) | Must be bypassed with ≥1μF ceramic capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| SW (6) | Switch node connection | Connects to inductor; high dI/dt path - requires minimized trace length and area to reduce EMI radiation. |
| ANODE (7) | Integrated Schottky anode terminal | Internally connects to SW; eliminates external diode in boost topology - reduces BOM count and layout area. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current sense amplifier; bias current increases with VISP–VISN. |
| ISN (12) | Current sense negative input | Inverting input of current sense amplifier; used with ISP to measure voltage across external RSENSE. |
| FB (13) | Voltage feedback input | Regulates to 1.22V; used for CV mode or open-LED protection - must not be left floating. |
| CTRL (14) | Current threshold adjustment input | Sets VISP–VISN threshold from 100mV to 250mV; ties to VREF (2V) for full-scale operation. |
| VREF (15) | 2.0V precision reference output | Supplies up to 100μA; used to bias CTRL, PWM, or external circuitry - improves system accuracy and reduces external references. |
| CATHODE (10) | Integrated Schottky cathode terminal | Connects to LED string cathode in boost mode; completes internal diode path - eliminates discrete diode placement. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 45V/750mA switch + Schottky diode | Reduces external component count by two devices and simplifies PCB layout in space-constrained automotive modules. |
| Rail-to-rail 0V–45V current sense (ISP/ISN) | Enables sense resistor placement on either side of LED string or in floating topologies - critical for buck-boost and SEPIC LED drivers. |
| True Color PWM™ dimming (3000:1) | Maintains consistent LED chromaticity at ultra-low duty cycles - essential for automotive ambient lighting compliance and display uniformity. |
| Programmable UVLO with hysteresis | Allows precise start/stop voltage thresholds (e.g., 6.2V fall / 8.2V rise) to prevent brown-out oscillation in vehicle battery systems. |
| Open-LED fault detection with status pin | Provides immediate hardware-level fault indication without software polling - improves functional safety in ASIL-B–compatible lighting systems. |
| Internal compensation and dual-loop regulation | Eliminates external compensation network and guarantees stable operation across boost/SEPIC/buck-boost/buck configurations. |
Applications
| Automotive Interior Lighting | Industrial Status Indicators |
|---|---|
|
Use Scenario: Illuminating door sills, footwells, and center consoles in 12V/24V vehicles with dynamic dimming profiles. IC Role / Device Role / Timing Role: Constant-current LED driver with PWM dimming interface and open-LED fault reporting. Use Value: Integrated Schottky and 45V switch support 38V LED strings; 3000:1 dimming meets OEM ambient lighting specifications. |
Use Scenario: Driving multi-color status LEDs on PLC I/O modules and HMI panels exposed to wide industrial temperature ranges. IC Role / Device Role / Timing Role: Robust, thermally efficient LED driver with rail-to-rail current sensing and UVLO hysteresis. Use Value: Four GND pins and MSOP package ensure reliability at 125°C junction temperature; open-LED detection prevents false alarms. |
| Display Backlighting | Architectural Accent Lighting |
|
Use Scenario: Powering white LED arrays in medical displays and ruggedized tablets requiring flicker-free dimming. IC Role / Device Role / Timing Role: High-accuracy current regulator with analog dimming (CTRL) and PWM synchronization capability. Use Value: 100mV–250mV adjustable current threshold enables precise luminance matching across LED bins and temperature drift. |
Use Scenario: Controlling long LED strips in commercial buildings using boost or buck-boost topologies with minimal external components. IC Role / Device Role / Timing Role: Flexible topology driver supporting boost, SEPIC, and buck-boost modes with single IC footprint. Use Value: Dual-loop regulation ensures stable current delivery despite wide input (6V–30V) and varying LED forward voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMS#TRPBF | Higher 1MHz switching frequency; no integrated Schottky; requires external MOSFET and diode. | Better suited for compact, high-efficiency designs where board space is constrained but external component count is acceptable. | Select LTC3783EMS#TRPBF only if higher frequency (1MHz) and external power stage flexibility outweigh BOM reduction benefits of LT3519EMS#TRPBF. |
| MAX16832ATP+ | 40V switch rating; 1.2A current limit; no integrated Schottky; 500kHz fixed frequency; different pinout and CTRL/PWM interface behavior. | Targeted at cost-sensitive industrial LED drivers where open-LED reporting and rail-to-rail sensing are not required. | Choose MAX16832ATP+ only when lower cost is prioritized over integrated diode, open-LED status, and analog dimming linearity. |
Compared with LTC3783EMS#TRPBF and MAX16832ATP+, the LT3519EMS#TRPBF uniquely combines integrated Schottky diode, rail-to-rail current sensing, and True Color PWM™ in a single 16-pin MSOP - delivering lowest BOM count and highest functional integration for automotive and industrial LED systems.
Availability
LT3519EMS#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, industrial status indicators, and display backlighting requiring stable component supply, AEC-Q200-aligned reliability, and long-term production continuity.
Supply support for LT3519EMS#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3519 family was designed specifically for robust, high-integration LED driving in harsh environments - emphasizing fault resilience (open-LED detection), thermal stability (–40°C to 125°C), and topology flexibility (boost/SEPIC/buck-boost/buck).
FAQ
What is the switching frequency of the LT3519EMS#TRPBF?
The LT3519EMS#TRPBF operates at a fixed 400kHz switching frequency. This value is factory-trimmed and does not require external timing components. It balances efficiency, magnetic size, and EMI performance for automotive and industrial LED applications. The LT3519EMS#TRPBF variant is distinct from the LT3519EMS-1#TRPBF (1MHz) and LT3519EMS-2#TRPBF (2.2MHz) versions.
Does the LT3519EMS#TRPBF include an integrated Schottky diode?
Yes, the LT3519EMS#TRPBF integrates a Schottky diode with anode (Pin 7) and cathode (Pin 10) terminals. This eliminates the need for an external diode in boost configurations, reducing BOM count and PCB area. The typical forward voltage is 0.8V at 500mA, and leakage is ≤4μA at 24V reverse bias.
How does open-LED detection work on the LT3519EMS#TRPBF?
The LT3519EMS#TRPBF monitors the FB pin voltage and asserts the OPENLED pin low when FB reaches 1.16V (1.22V – 60mV). This occurs when the LED string opens and the voltage loop takes control. The OPENLED pin is open-drain and requires an external pull-up resistor to report the fault to a microcontroller or monitoring circuit.
Can the LT3519EMS#TRPBF operate in buck topology?
Yes, the LT3519EMS#TRPBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, the ANODE pin connects to VIN, CATHODE to the LED cathode, and the inductor is placed between SW and the LED anode. The datasheet provides specific resistor divider guidance for open-LED protection in buck configuration.
What is the purpose of the CTRL pin on the LT3519EMS#TRPBF?
The CTRL pin on the LT3519EMS#TRPBF sets the current-sense threshold voltage across the external sense resistor (RSENSE). Applying 0.1V–1.0V yields linear current scaling (ILED = (VCTRL – 100mV)/(4 × RSENSE)); above 1.2V, it clamps to 250mV full-scale. This enables precise analog dimming and current calibration without trimming resistors.
LT3519EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 750mA (Switch)
- Frequency:
- 400kHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3519EMS#TRPBF FAQ
1.How can I place an order for LT3519EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519EMS#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 LT3519EMS#TRPBF reliable?
The price and inventory of LT3519EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3519EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519EMS#TRPBF?
LT3519EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519EMS#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 LT3519EMS#TRPBF?
For technical support, including LT3519EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519EMS#TRPBF requirements.
6.How does Aetrix verify that LT3519EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519EMS#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 LT3519EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519EMS#TRPBF?
All LT3519EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519EMS#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 LT3519EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3519EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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