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Analog Devices Inc. LT3519EMS-1#PBF
- Part No.:
- LT3519EMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519EMS-1#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:920
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Product details
Overview
LT3519EMS-1#PBF 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 sense (0V–45V), open LED protection, and programmable UVLO. It drives automotive and industrial LED arrays requiring up to 150mA output in boost topology.
For engineers reviewing the LT3519EMS-1#PBF datasheet, LT3519EMS-1#PBF pinout, LT3519EMS-1#PBF application, or LT3519EMS-1#PBF equivalent, key selection considerations include switching frequency (1MHz), internal Schottky integration, PWM dimming ratio (up to 3000:1), CTRL-based analog dimming, and MSOP-16 package compatibility with thermal constraints in space-constrained LED lighting designs.
Technical Context
The LT3519EMS-1#PBF implements current-mode control with dual feedback loops: voltage regulation via FB pin (1.22V reference) and rail-to-rail current sensing across ISP/ISN pins. Its internal 1MHz oscillator enables compact magnetics and reduced EMI in high-density layouts.
It features a unique current-sense architecture where the CTRL pin linearly adjusts the VISP–VISN threshold from 100mV to 250mV, enabling precise analog dimming. The OPENLED status pin asserts when FB drops within ~60mV of 1.22V, signaling open-circuit LED fault detection without external comparators.
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 and cost in automotive LED drivers. |
| Internal Switch Rating | 45V VDS, 750mA ISW - supports boost topologies up to ~38V LED strings with transient tolerance to 40V at VIN. |
| Current Sense Range | Rail-to-rail 0V–45V - allows direct sensing on either side of LED string (high-side or low-side configuration) without level-shifting circuitry. |
| PWM Dimming Ratio | Up to 3000:1 - achieves high-fidelity color stability in automotive interior/exterior lighting without visible flicker at 120Hz modulation. |
| CTRL Pin Dimming Range | 0.1V–1.2V input sets LED current from ~0% to 100% - provides linear analog control independent of PWM, extending total dimming range when combined. |
| Open LED Detection | FB threshold offset of –60mV triggers OPENLED pull-down - delivers fail-safe status reporting for ASIL-B–compatible lighting systems without added components. |
| UVLO Hysteresis | Programmable via SHDN/UVLO resistor divider with 1.22V falling threshold - ensures clean startup/shutdown sequencing in 12V/24V vehicle electrical systems. |
Pinout & Package
LT3519EMS-1#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (3mm × 4.9mm, 0.5mm pitch) with four GND pins (1, 8, 9, 16) for low-impedance grounding and improved thermal dissipation in LED driver PCBs.
| 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 current-sense accuracy in high-noise automotive environments. |
| OPENLED (2) | Open-collector fault status output | Pulls low when FB exceeds 1.16V - directly interfaces with microcontroller GPIO or fault-monitoring logic without pull-up resistor sizing ambiguity. |
| PWM (3) | Switching enable/disable control | Internal pull-down; low disables oscillator and saves VC node state - enables fast recovery (<6 switching cycles) after PWM off-time. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout input | 1.22V falling threshold with user-programmable hysteresis - supports robust power sequencing in battery-supplied systems with wide voltage transients. |
| VIN (5) | Main input supply (3V–30V continuous) | Requires local 1μF ceramic bypass - critical for stable operation during load transients and cold-crank conditions down to 3V. |
| SW (6) | Switch node connection | Connects to inductor - trace must be short and wide to minimize EMI and switching losses in high-frequency (1MHz) operation. |
| ANODE (7) | Integrated Schottky anode terminal | Eliminates external diode in boost mode - reduces BOM count and improves efficiency by ~2% over discrete solutions. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current amplifier - accepts sense voltage referenced to up to 45V, enabling high-side sensing in buck-boost configurations. |
| ISN (12) | Current sense negative input | Inverting input of current amplifier - differential pair with ISP defines LED current setpoint; bias current increases with VISP–VISN. |
| FB (13) | Voltage feedback input | Regulates to 1.22V - used for constant-voltage mode or open-LED detection; must not be left floating. |
| CTRL (14) | Analog dimming threshold control | Sets VISP–VISN threshold from 100mV to 250mV - enables 0–100% linear LED current scaling with <1% resistor tolerance. |
| VREF (15) | 2.0V precision reference output | Supplies up to 100μA - powers external resistive dividers or CTRL bias networks; regulated to ±2% over temperature and line. |
| CATHODE (10) | Integrated Schottky cathode terminal | Completes internal diode path - connects to output capacitor in boost mode; requires low-ESR ceramic placement adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Reduces component count by one part and improves efficiency by eliminating forward drop and reverse recovery losses of external diodes. |
| Rail-to-rail current sense (0V–45V) | Enables flexible PCB layout with ISP/ISN placed on either side of LED string - avoids level shifters or op-amp buffers in high-voltage LED applications. |
| True Color PWM™ dimming (3000:1) | Maintains consistent LED chromaticity across full dimming range - critical for automotive cabin lighting meeting SAE J1337 color fidelity requirements. |
| Internal compensation | Eliminates external compensation network - simplifies design validation and reduces risk of instability due to layout parasitics in production-grade LED drivers. |
| Open LED protection with status pin | Provides hardware-level fault indication without firmware polling - meets functional safety requirements for Class C LED lighting per ISO 26262 ASIL-B. |
| 1MHz fixed-frequency operation | Supports ultra-compact passive components (e.g., 15μH inductor, 2.2μF output cap) - ideal for space-constrained headlight modules and instrument cluster backlighting. |
Applications
| Automotive Headlights | Industrial Machine Vision Lighting |
|---|---|
|
Use Scenario: Driving 38V white LED strings in adaptive front-lighting systems (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: Constant-current LED driver with 1MHz switching, open-LED fault reporting, and 3000:1 PWM dimming for glare-free low-beam modulation. Use Value: Eliminates need for external Schottky and current-sense amplifier - reduces BOM cost by $0.32/unit and improves thermal margin by 8°C in sealed headlamp housings. |
Use Scenario: Illuminating high-speed inspection zones in factory automation using pulsed 150mA LED arrays synchronized to camera exposure. IC Role / Device Role / Timing Role: Precision current source with sub-microsecond PWM recovery and rail-to-rail sense capability for 24V LED strings. Use Value: Enables 120Hz strobe timing with <1% current ripple - ensures consistent image brightness across 10k+ frames/hour in vision-guided robotics. |
| Commercial Signage Backlighting | Medical Diagnostic Equipment Lighting |
|
Use Scenario: Powering RGB LED modules in outdoor digital signage exposed to 40V load-dump transients. IC Role / Device Role / Timing Role: Boost converter with 40V transient-rated VIN and programmable UVLO hysteresis for reliable startup after brownouts. Use Value: Withstands ISO 7637-2 Pulse 5a transients without latch-off - extends field reliability beyond 10-year outdoor deployment life. |
Use Scenario: Driving calibrated 9V LED arrays in ophthalmic imaging devices requiring flicker-free, color-accurate illumination. IC Role / Device Role / Timing Role: Buck-mode LED controller with analog dimming (CTRL pin) and 1.22V FB reference for stable photometric output. Use Value: Achieves <±0.5% LED current regulation over 0–85°C - maintains ANSI C78.377 chromaticity coordinates within binning limits. |
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; lower switching loss but requires larger inductor (68μH) and output capacitor (4.7μF). | Better suited for low-EMI, thermally relaxed designs where board area is less constrained than in automotive modules. | Select when efficiency at light loads or EMI compliance in CISPR-25 Class 5 is prioritized over size. |
| LT3519EMS-2#PBF | 2.2MHz switching frequency; enables smallest passives (6.8μH inductor, 1μF output cap) but higher gate drive loss at full load. | Ideal for ultra-compact portable medical or wearable LED systems where volume is critical and thermal headroom is limited. | Select when PCB footprint is <150mm² and peak efficiency >88% at 500mA is required in buck-mode configurations. |
Compared with LT3519EMS#PBF and LT3519EMS-2#PBF, the LT3519EMS-1#PBF strikes a balance: its 1MHz frequency delivers 30% smaller magnetics than the 400kHz variant while maintaining 2% higher full-load efficiency than the 2.2MHz version-making it optimal for mid-size automotive LED modules where thermal, size, and EMI are co-constrained.
Availability
LT3519EMS-1#PBF is available at Aetrix Electronics and suitable for automotive lighting, industrial machine vision, commercial signage, and medical diagnostic equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT3519EMS-1#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, and communications markets.
The LT3519 family was designed specifically for high-reliability LED lighting in harsh environments-emphasizing integrated protection (open LED, UVLO, overvoltage), wide input range (3V–30V), and robust thermal performance in MSOP packaging.
FAQ
What is the maximum LED string voltage supported by the LT3519EMS-1#PBF?
The LT3519EMS-1#PBF supports LED string voltages up to 45V, determined by its 45V-rated internal switch and Schottky diode. In boost configuration, output voltage is limited by external component ratings and layout; typical validated designs achieve 38V at 150mA. Transient tolerance at VIN is 40V for ≤1 second, ensuring robustness against automotive load-dump events.
Does the LT3519EMS-1#PBF require external compensation components?
No, the LT3519EMS-1#PBF features internal compensation, eliminating the need for external RC networks. This simplifies layout, reduces BOM count, and avoids stability risks from PCB parasitics-critical for production-grade LED drivers where design cycle time and yield are tightly coupled.
Can the LT3519EMS-1#PBF operate in buck mode?
Yes, the LT3519EMS-1#PBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, ANODE is connected to VIN and CATHODE to the LED cathode, with ISP/ISN sensing current on the low-side. Reference Figure 3519 TA04a in the datasheet for a validated 500mA buck-mode implementation.
What is the minimum PWM pulse width for achieving 3000:1 dimming with the LT3519EMS-1#PBF?
To achieve the full 3000:1 PWM dimming ratio, the minimum PWM pulse width must be ≥3μs-corresponding to six 1MHz switching cycles. Shorter pulses cause incomplete current ramp-up, degrading dimming linearity and color fidelity. System-level timing must ensure tMAX/tMIN ≥3000, e.g., 9ms period with 3μs on-time.
How does the CTRL pin affect LED current programming in the LT3519EMS-1#PBF?
The CTRL pin sets the VISP–VISN threshold linearly from 100mV to 250mV. At 0.1V ≤ VCTRL ≤ 1.0V, ILED = (VCTRL – 100mV)/(4 × RSENSE). Above 1.2V, it clamps to 250mV/RSENSE. Using a precision 1% RSENSE ensures ±1% current accuracy across temperature.
LT3519EMS-1#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:
- 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#PBF FAQ
1.How can I place an order for LT3519EMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519EMS-1#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-1#PBF reliable?
The price and inventory of LT3519EMS-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3519EMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519EMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519EMS-1#PBF?
LT3519EMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519EMS-1#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-1#PBF?
For technical support, including LT3519EMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519EMS-1#PBF requirements.
6.How does Aetrix verify that LT3519EMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3519EMS-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3519EMS-1#PBF?
All LT3519EMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519EMS-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LT3519EMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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