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Analog Devices Inc. LT3519EMS-1#TRPBF
- Part No.:
- LT3519EMS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519EMS-1#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,952
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Product details
Overview
LT3519EMS-1#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency 1MHz 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 sensing (0V–45V), open LED protection, and delivers up to 3000:1 True Color PWM™ dimming for automotive LED lighting systems.
For engineers reviewing the LT3519EMS-1#TRPBF datasheet, LT3519EMS-1#TRPBF pinout, LT3519EMS-1#TRPBF application, or LT3519EMS-1#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed topology flexibility (boost/SEPIC/buck-boost/buck), real-world dimming performance data, and precise alternative part guidance for LED driver design and qualification.
Technical Context
The LT3519EMS-1#TRPBF implements current-mode control with internal compensation, combining voltage feedback (FB pin, 1.22V reference) and rail-to-rail current sense feedback (ISP/ISN) to enable seamless transition between constant-current and constant-voltage regulation modes. Its error amplifier selects the lower of the two loop outputs to determine peak switch current.
It features a dedicated OPENLED status pin asserting when FB exceeds VFB – 60mV (typ), programmable SHDN/UVLO with 1.22V falling threshold and external hysteresis, and CTRL-pin-based analog dimming that linearly adjusts the 250mV current-sense threshold from 100mV to 250mV. The 1MHz switching frequency enables compact magnetics and reduced output ripple in space-constrained automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1MHz - enables use of smaller inductors (e.g., 15μH) and ceramic output capacitors, reducing board area in automotive headlight and interior lighting modules. |
| Internal Switch Rating | 45V VDS, 750mA ISW - supports driving 38V LED strings from 6–30V input rails with transient tolerance up to 40V, eliminating need for external high-voltage MOSFETs. |
| Current Sense Range | Rail-to-rail ISP/ISN (0V to 45V) - allows direct sensing across high-side or low-side sense resistors in boost, buck, or SEPIC topologies without level-shifting circuitry. |
| Dimming Capability | 3000:1 True Color PWM™ - preserves LED color fidelity during deep dimming via synchronized internal VC-node charge retention, critical for adaptive front-lighting systems (AFS). |
| Open LED Detection | OPENLED pin asserts low when FB ≥ VFB – 60mV - provides fail-safe fault reporting without external comparators, simplifying compliance with ISO 26262 ASIL-B functional safety requirements. |
| CTRL Pin Dimming | Analog dimming from 100mV to 250mV threshold - enables linear LED current scaling (ILED = (VCTRL – 0.1V)/(4 × RSENSE)) for smooth brightness transitions in cabin ambient lighting. |
| Package | 16-Lead MSOP - thermally enhanced plastic package with four GND pins (1, 8, 9, 16) for low-impedance grounding and improved thermal dissipation in enclosed automotive enclosures. |
Pinout & Package
LT3519EMS-1#TRPBF is housed in a 16-lead plastic MSOP package with exposed pad (θJA = 130°C/W). Four dedicated GND pins (1, 8, 9, 16) provide low-inductance return paths and support thermal management in high-current LED driver layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground | Four independent ground connections minimize ground bounce and improve EMI performance; tie directly to PCB ground plane for thermal conduction. |
| OPENLED (2) | Open-collector fault status output | Pulls low when FB ≥ VFB – 60mV; requires external pull-up resistor to report open-circuit LED string faults to microcontroller or system monitor. |
| PWM (3) | Switching enable/disable control | Low disables oscillator and main switch; internal pull-down ensures safe default-off state; used for high-ratio PWM dimming with stored VC-node state. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout input | 1.22V falling threshold with externally programmable hysteresis; sub-μA bias current below threshold enables ultra-low quiescent power in vehicle sleep mode. |
| VIN (5) | Main input supply | Accepts 3V–30V continuous, 40V transient; requires local 1μF ceramic bypass capacitor placed adjacent to pin for stable operation under load transients. |
| SW (6) | Switch node | Connects to inductor; high dv/dt node requiring minimized trace length and area to reduce radiated EMI in automotive EMC-sensitive environments. |
| ANODE (7) | Integrated Schottky anode | Connects to inductor output in boost/SEPIC; eliminates discrete diode, reducing BOM count and forward drop losses in high-efficiency designs. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current sense amplifier; bias current increases with (VISP – VISN); keep away from SW node to avoid noise coupling. |
| ISN (12) | Current sense negative input | Inverting input of current sense amplifier; forms Kelvin connection across RSENSE for accurate LED current regulation independent of PCB trace resistance. |
| FB (13) | Voltage feedback input | Regulates to 1.22V; used for constant-voltage output or open-LED detection; must not be left floating-connect to GND if unused. |
| CTRL (14) | Current threshold adjustment | Sets VISP–VISN threshold from 100mV to 250mV; connects to VREF (2V) for full-scale operation; enables analog dimming without external DAC. |
| VREF (15) | 2.0V precision reference output | Supplies up to 100μA; used to bias CTRL, PWM, or external circuitry; exhibits 0.04%/V line regulation for stable dimming control over wide VIN range. |
| CATHODE (10) | Integrated Schottky cathode | Connects to LED anode in boost configuration or to output capacitor; internal 0.8V forward drop at 500mA improves efficiency vs. discrete diodes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 45V/750mA switch + Schottky diode | Reduces component count by 2–3 devices, eliminates layout sensitivity of discrete diode placement, and lowers forward conduction loss in boost LED drivers. |
| Rail-to-rail current sense (0V–45V) | Enables flexible PCB layout with high-side or low-side current sensing in any topology-no level shifters or op-amps required for ISP/ISN interface. |
| True Color PWM™ dimming (3000:1) | Maintains consistent LED chromaticity at all dimming levels by preserving VC-node charge state during PWM off-time, avoiding color shift in automotive signaling. |
| Programmable SHDN/UVLO with hysteresis | Allows precise turn-on/turn-off thresholds (e.g., 6.2V fall / 8.2V rise) using two external resistors, supporting robust cold-cranking and battery brownout recovery. |
| Open LED protection with status pin | Provides hardware-level fault detection and reporting without software polling-critical for ASIL-B-compliant lighting control units requiring deterministic response. |
| Internal compensation | Eliminates external compensation network, reducing design cycle time and enabling reliable operation across temperature (-40°C to 125°C) and input voltage variation. |
Applications
| Automotive Headlights | Interior Ambient Lighting |
|---|---|
|
Use Scenario: Driving 38V white LED arrays in adaptive driving beam (ADB) modules with dynamic zone control. IC Role / Device Role / Timing Role: Constant-current LED driver with 1MHz switching, open LED fault reporting, and 3000:1 PWM dimming for pixel-level brightness control. Use Value: Enables compact, high-efficiency ADB designs meeting ECE R149 photometric requirements while reducing thermal stress on LEDs through precise current regulation. |
Use Scenario: Powering RGB LED strips for mood lighting in instrument clusters and door panels with smooth analog + PWM dimming. IC Role / Device Role / Timing Role: Multi-topology LED controller supporting buck mode for low-Vf red/green/blue LEDs and analog dimming via CTRL pin. Use Value: Delivers flicker-free, color-stable illumination across 0.1–100% brightness range without external DACs or complex MCU timing coordination. |
| Commercial Signage | Industrial Machine Vision |
|
Use Scenario: High-brightness outdoor LED signage operating from 12–30V DC power supplies with wide temperature swings. IC Role / Device Role / Timing Role: Boost-mode LED driver with 40V transient protection, rail-to-rail current sensing, and programmable UVLO for reliable startup in variable grid conditions. Use Value: Ensures consistent luminance and long LED lifetime despite input voltage sags or surges, reducing field failure rates in unattended installations. |
Use Scenario: Stroboscopic LED illumination for high-speed inspection cameras requiring precise pulse timing and intensity stability. IC Role / Device Role / Timing Role: Synchronized PWM dimming controller with <1μA shutdown current and fast transient recovery (<6 switching cycles) for repeatable exposure control. Use Value: Eliminates image artifacts caused by LED current droop or overshoot during strobe pulses, improving defect detection accuracy in automated optical inspection (AOI). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | 4-switch buck-boost controller (external FETs), no integrated switch or diode; supports higher output power (>10W) but requires more external components. | Used in high-power architectural lighting where thermal management and efficiency >95% are prioritized over BOM count. | Select LTC3783EFE#PBF only when output current exceeds 750mA or when multi-string parallel LED driving with independent current regulation is required. |
| MAX16832ATP+T | 40V/2.5A high-side switch LED driver; fixed 500kHz frequency; no integrated diode; supports analog dimming only (no PWM dimming). | Targeted at cost-sensitive industrial LED drivers where 1000:1 dimming suffices and transient immunity to 40V is acceptable. | Choose MAX16832ATP+T for simpler, lower-cost designs where 3000:1 PWM dimming and rail-to-rail current sensing are not required. |
Compared with LTC3783EFE#PBF and MAX16832ATP+T, the LT3519EMS-1#TRPBF uniquely integrates both switch and Schottky diode while delivering 3000:1 True Color PWM™ dimming and rail-to-rail current sensing-making it optimal for compact, high-fidelity automotive LED modules where BOM reduction and color consistency are critical.
Availability
LT3519EMS-1#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, and commercial signage applications requiring stable component supply, AEC-Q100-compliant performance, and long-term production continuity.
Supply support for LT3519EMS-1#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 its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LT3519EMS-1#TRPBF belongs to Linear's automotive-grade LED driver product line, engineered specifically for robust, high-efficiency constant-current LED control in harsh environments with wide input voltage ranges and stringent EMC requirements.
FAQ
What is the switching frequency of the LT3519EMS-1#TRPBF?
The LT3519EMS-1#TRPBF operates at a fixed 1MHz switching frequency, as indicated by the "-1" suffix in its part number. This higher frequency enables smaller external inductors and ceramic capacitors compared to the base LT3519 (400kHz) or LT3519-2 (2.2MHz), optimizing board space in automotive LED modules where size and thermal constraints are critical. The LT3519EMS-1#TRPBF maintains tight frequency tolerance across temperature and load conditions per its datasheet specifications.
Does the LT3519EMS-1#TRPBF include an integrated Schottky diode?
Yes, the LT3519EMS-1#TRPBF integrates a Schottky diode with 0.8V forward drop at 500mA and 4μA leakage at 24V, connected between ANODE (Pin 7) and CATHODE (Pin 10). This eliminates the need for an external diode in boost, SEPIC, and buck-boost configurations, reducing BOM count, PCB area, and conduction losses-key advantages for thermally constrained automotive lighting designs.
How does open LED detection work on the LT3519EMS-1#TRPBF?
The LT3519EMS-1#TRPBF monitors the FB pin voltage and asserts the OPENLED pin low when FB reaches VFB – 60mV (typical), indicating loss of LED load. This hardware-based detection requires no MCU intervention and supports fail-safe behavior in safety-critical lighting systems. An external pull-up resistor is mandatory on OPENLED to generate a valid logic-high signal during normal operation.
Can the LT3519EMS-1#TRPBF operate in buck mode?
Yes, the LT3519EMS-1#TRPBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, the LED string connects between ANODE and GND, with CATHODE tied to VIN. The datasheet provides explicit application circuits and component selection guidelines-including inductor sizing formulas-for each configuration, enabling flexible reuse across diverse LED lighting architectures.
What is the maximum input voltage rating for the LT3519EMS-1#TRPBF?
The LT3519EMS-1#TRPBF has an absolute maximum VIN rating of 40V for nonrepetitive one-second transients and a continuous operating range of 3V to 30V. This 40V transient tolerance accommodates automotive load-dump events per ISO 7637-2, making the LT3519EMS-1#TRPBF suitable for 12V and 24V vehicle electrical systems without additional input protection circuitry.
LT3519EMS-1#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:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3519EMS-1#TRPBF FAQ
1.How can I place an order for LT3519EMS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519EMS-1#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-1#TRPBF reliable?
The price and inventory of LT3519EMS-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519EMS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519EMS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519EMS-1#TRPBF?
LT3519EMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519EMS-1#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-1#TRPBF?
For technical support, including LT3519EMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519EMS-1#TRPBF requirements.
6.How does Aetrix verify that LT3519EMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519EMS-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519EMS-1#TRPBF?
All LT3519EMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519EMS-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3519EMS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3519EMS-1#TRPBF Tags
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