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Analog Devices Inc. LT3519EMS-2#PBF
- Part No.:
- LT3519EMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519EMS-2#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
LT3519EMS-2#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, 2.2MHz 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 (0–45V), and delivers up to 3000:1 True Color PWM™ dimming for automotive LED lighting systems operating from 3V to 30V input.
For engineers reviewing the LT3519EMS-2#PBF datasheet, LT3519EMS-2#PBF pinout, LT3519EMS-2#PBF application, or LT3519EMS-2#PBF equivalent, key selection considerations include switching frequency (2.2MHz), internal Schottky integration, open-LED fault detection via OPENLED pin, and dual analog/PWM dimming control-critical for compact, high-reliability LED headlamp and DRL designs.
Technical Context
The LT3519EMS-2#PBF implements current-mode control with internal compensation, enabling stable operation across boost, SEPIC, buck-boost, and buck topologies. Its dual-loop architecture simultaneously monitors voltage feedback (FB pin, 1.22V reference) and rail-to-rail current sense (ISP/ISN), allowing seamless transition between constant-current and constant-voltage regulation modes based on load conditions.
It features a dedicated CTRL pin for linear analog dimming (0.1V–1.2V input adjusts 250mV current-sense threshold), a PWM pin supporting up to 3000:1 dimming ratio, and an open-collector OPENLED status output that asserts when FB exceeds VREF − 60mV-enabling robust open-string fault reporting without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables ultra-compact magnetics and output filtering; reduces EMI fundamental frequency above sensitive bands. |
| Internal Switch Rating | 45V VDS, 750mA ISW - supports 38V LED strings in boost mode with margin; eliminates need for external MOSFET in mid-power applications. |
| Integrated Schottky Diode | 0.8V forward drop at 500mA - reduces conduction loss and board area vs discrete diode; rated for 45V reverse blocking. |
| Current Sense Range | Rail-to-rail 0V–45V ISP/ISN - allows LED cathode sensing in buck, anode sensing in boost, and floating-string configurations without level-shifting. |
| Dimming Capability | 3000:1 True Color PWM™ + analog dimming via CTRL pin - preserves color fidelity during deep dimming; avoids low-frequency flicker in automotive interior lighting. |
| Open LED Detection | OPENLED pin pulls low when FB > VREF − 60mV - provides immediate, latchable fault indication for disconnected LED strings without software polling. |
| UVLO Threshold | 1.22V falling, programmable hysteresis - ensures clean startup/shutdown in automotive 12V systems with battery transients; supports custom turn-on voltage via resistor divider. |
Pinout & Package
LT3519EMS-2#PBF is housed in a thermally enhanced 16-lead MSOP package (4.0mm × 3.0mm, 0.5mm pitch) with four GND pins (1, 8, 9, 16) for low-impedance grounding and thermal dissipation. The exposed pad (EP) must be soldered to a PCB thermal plane per manufacturer guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground | Four dedicated ground connections minimize ground bounce and improve thermal performance; EP must be connected to GND plane. |
| OPENLED (2) | Open LED status output | Open-drain output asserting low when FB exceeds VREF − 60mV; requires external pull-up for fault reporting to MCU or dashboard. |
| PWM (3) | Pulse-width modulation enable | Active-high digital dimming control; internal pull-down allows direct microcontroller GPIO connection; disables oscillator when low. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout | Combines enable/disable function with accurate 1.22V UVLO threshold and user-programmable hysteresis via resistor divider. |
| VIN (5) | Main input supply | Accepts 3V–30V continuous, 40V transient; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| SW (6) | Switch node | Connects to inductor; high dv/dt node requiring minimal trace length and separation from sensitive analog signals (ISP/ISN/FB). |
| ANODE (7) | Integrated Schottky anode | Internally connects to SW; used in boost topology where Schottky anode ties to inductor output. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current sense amplifier; bias current increases with VISP−VISN; must be routed away from SW. |
| ISN (12) | Current sense negative input | Inverting input of current sense amplifier; forms Kelvin pair with ISP for accurate RSENSE voltage measurement. |
| FB (13) | Voltage feedback input | Sets output voltage in CV mode (1.22V reference); also enables open-LED detection; must not be left floating. |
| CTRL (14) | Analog dimming threshold control | Linearly adjusts current-sense threshold from 100mV to 250mV; 0.1V–1.0V range gives proportional ILED; tie to VREF for full-scale operation. |
| VREF (15) | 2.0V precision reference output | Stable 2.0V ±2% output sourcing up to 100μA; used to bias CTRL, PWM, or external circuitry; regulated against VIN variation. |
| CATHODE (10) | Integrated Schottky cathode | Internally connects to output capacitor; used in boost topology where Schottky cathode ties to LED string anode. |
Key Features
| Feature | Design Value |
|---|---|
| 2.2MHz fixed switching frequency | Enables use of sub-10μH inductors and <2.2μF ceramic output capacitors-reducing solution size by >40% vs 400kHz variants. |
| Integrated 45V/750mA switch + Schottky diode | Eliminates two external components, reduces BOM count, and improves reliability in space-constrained automotive modules. |
| Rail-to-rail ISP/ISN inputs (0V–45V) | Supports all major LED driver topologies (boost, buck, SEPIC, buck-boost) without external level shifters or op-amps. |
| True Color PWM™ dimming (3000:1) | Maintains consistent LED chromaticity across full dimming range-essential for automotive adaptive front-lighting systems (AFS). |
| Programmable open-LED protection with OPENLED pin | Provides hardware-level fault signaling independent of controller firmware; reduces system validation effort and failure response time. |
| Internal compensation network | Removes requirement for external compensation components-simplifies design, accelerates prototyping, and improves production yield. |
Applications
| Automotive Front Lighting | Commercial Interior Lighting |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays in adaptive headlamps and daytime running lights (DRL) with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Constant-current LED driver with 2.2MHz switching, integrated power stage, and open-circuit fault reporting. Use Value: Enables compact, fanless headlamp modules meeting CISPR-25 Class 5 radiated emissions; OPENLED pin simplifies ASIL-B fault diagnostics. |
Use Scenario: Powering tunable-white LED fixtures in office buildings and retail spaces requiring smooth 0.1%–100% dimming without color shift. IC Role / Device Role / Timing Role: Dual-mode (CV/CC) LED driver supporting analog dimming via CTRL and high-ratio PWM for architectural lighting control systems. Use Value: True Color PWM™ preserves CRI >90 across full dimming range; 3000:1 ratio eliminates visible stepping in DALI-2 and 0–10V dimming interfaces. |
| Industrial Machine Vision | Transportation Signage |
|
Use Scenario: Illuminating high-speed inspection cameras with strobed LED flashes synchronized to camera shutter timing. IC Role / Device Role / Timing Role: Fast-response LED driver with PWM-controlled current pulses and low quiescent shutdown (<1μA). Use Value: 2.2MHz switching enables <500ns current rise/fall times; internal Schottky minimizes pulse jitter versus discrete solutions. |
Use Scenario: Driving red/green/amber LED segments in outdoor traffic signals and railway crossing signs exposed to wide temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Automotive-grade LED driver with 40V transient protection, open-LED monitoring, and AEC-Q100 stress qualification. Use Value: Guaranteed operation over full -40°C to +125°C junction range; built-in UVLO hysteresis prevents brown-out oscillation during battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3519EMS#PBF | 400kHz switching frequency; larger inductor/capacitor requirements; lower switching loss at light loads. | Better suited for cost-sensitive, non-EMI-critical industrial LED drivers where board space is less constrained. | Select when thermal management priority outweighs size; avoid in automotive front lighting due to EMI and layout sensitivity. |
| LT3519EMS-1#PBF | 1MHz switching frequency; balanced trade-off between component size and efficiency across 5–25V input range. | Ideal for mid-power commercial lighting (e.g., downlights, troffers) requiring moderate footprint reduction without 2.2MHz EMI challenges. | Choose for general-purpose LED drivers where 2.2MHz EMI filtering adds cost; maintains same pinout and feature set. |
Compared with LT3519EMS#PBF and LT3519EMS-1#PBF, the LT3519EMS-2#PBF delivers the smallest total solution size and highest PWM dimming resolution-making it optimal for space-limited, high-performance automotive and machine vision applications where EMI can be managed via layout and shielding.
Availability
LT3519EMS-2#PBF is available at Aetrix Electronics and suitable for automotive front lighting, commercial interior lighting, industrial machine vision, and transportation signage requiring stable component supply, AEC-Q100-compliant performance, and long-term production continuity.
Supply support for LT3519EMS-2#PBF 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 high-reliability, multi-topology LED driving in harsh environments-emphasizing integrated power stages, fault resilience, and flexible dimming for automotive lighting and industrial illumination.
FAQ
What is the maximum input voltage rating for LT3519EMS-2#PBF?
The LT3519EMS-2#PBF has an absolute maximum VIN rating of 40V for nonrepetitive one-second transients and 30V for continuous operation. This 40V transient tolerance supports automotive load-dump conditions per ISO 7637-2, while the 30V continuous rating aligns with 24V nominal truck/bus systems. Exceeding 40V risks permanent damage.
Does LT3519EMS-2#PBF support buck topology operation?
Yes, the LT3519EMS-2#PBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, the ANODE pin connects to VIN, CATHODE to the LED cathode, and ISP/ISN sense current through a low-side resistor. The datasheet Figure TA04a shows a validated 500mA buck-mode application with 12V–30V input.
How does the OPENLED pin function in LT3519EMS-2#PBF?
The OPENLED pin on the LT3519EMS-2#PBF is an open-drain output that pulls low when the FB pin voltage exceeds VREF − 60mV (i.e., ~1.16V). This indicates an open LED string condition. It requires an external pull-up resistor and latches its state during PWM low periods, providing reliable hardware-level fault reporting without MCU intervention.
What is the purpose of the CTRL pin on LT3519EMS-2#PBF?
The CTRL pin on the LT3519EMS-2#PBF sets the current-sense threshold voltage between ISP and ISN. Applying 0.1V–1.0V yields linear analog dimming (ILED = (VCTRL − 100mV)/(4 × RSENSE)); ≥1.2V clamps threshold at 250mV for full-scale current. It enables precise brightness control independent of PWM duty cycle.
Can LT3519EMS-2#PBF drive multiple LED strings in parallel?
No-LT3519EMS-2#PBF is designed for single-string constant-current driving. Parallel LED strings require individual current regulation to prevent thermal runaway; using one LT3519EMS-2#PBF for multiple strings risks current imbalance and premature failure. For multi-string applications, use separate LT3519EMS-2#PBF channels or a matrix driver IC.
LT3519EMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 2.2MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3519EMS-2#PBF FAQ
1.How can I place an order for LT3519EMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519EMS-2#PBF 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-2#PBF reliable?
The price and inventory of LT3519EMS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3519EMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3519EMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519EMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519EMS-2#PBF?
LT3519EMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519EMS-2#PBF 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-2#PBF?
For technical support, including LT3519EMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519EMS-2#PBF requirements.
6.How does Aetrix verify that LT3519EMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3519EMS-2#PBF 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-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3519EMS-2#PBF?
All LT3519EMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519EMS-2#PBF, 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-2#PBF part is unused and in its original packaging.
Return procedure for LT3519EMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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