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Analog Devices Inc. LT3519IMS-1#PBF
- Part No.:
- LT3519IMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519IMS-1#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,442
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Product details
Overview
LT3519IMS-1#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency 1 MHz 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 (0–45V), open-LED protection, and programmable UVLO. It targets automotive interior lighting and industrial LED arrays requiring robust transient immunity up to 40V.
For engineers reviewing the LT3519IMS-1#PBF datasheet, LT3519IMS-1#PBF pinout, LT3519IMS-1#PBF application, or LT3519IMS-1#PBF equivalent, key selection criteria include switching frequency (1 MHz), internal Schottky integration, PWM dimming ratio (up to 3000:1), rail-to-rail ISP/ISN voltage range, and MSOP-16 automotive-grade packaging.
Technical Context
The LT3519IMS-1#PBF implements current-mode control with dual feedback loops: one for voltage regulation (FB pin, 1.22 V reference) and one for LED current regulation (ISP/ISN differential sense, threshold adjustable via CTRL pin). Its internal 1 MHz oscillator enables compact magnetics and reduced output ripple in space-constrained LED systems.
It operates across topologies including boost, SEPIC, buck-boost, and buck mode-enabled by flexible current-sense architecture and open-drain OPENLED status reporting. The device features internal compensation, rail-to-rail current sense inputs, and sub-μA shutdown current (<1 μA), supporting high-efficiency, low-quiescent-power LED drivers in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1 MHz - Enables use of smaller inductors (e.g., 15 μH) and ceramic output capacitors; reduces EMI filtering burden. |
| Internal Switch Rating | 45 V / 750 mA - Supports LED strings up to ~38 V with margin for transients; eliminates need for external high-voltage MOSFET. |
| Current Sense Range | Rail-to-rail 0 V to 45 V - Allows direct sensing across LED string regardless of cathode/anode configuration (e.g., high-side or low-side current sense). |
| PWM Dimming Ratio | Up to 3000:1 - Achieved with external PWM signal; preserves color fidelity in automotive lighting via True Color PWM™ technology. |
| Operating Input Voltage | 3 V to 30 V continuous, 40 V transient - Matches automotive battery range (cold crank, load dump) without external TVS. |
| Package | 16-Lead MSOP - Thermally enhanced plastic package with four GND pins; qualified for –40°C to +125°C junction temperature. |
| Shutdown Current | <1 μA - Enables always-on vehicle modules (e.g., daytime running lights) with negligible battery drain. |
Pinout & Package
LT3519IMS-1#PBF uses a 16-lead plastic MSOP package with exposed pad for thermal dissipation. Four GND pins (1, 8, 9, 16) improve grounding and thermal performance. Pin functions are validated per Linear Technology's 3519fa datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground | Multiple low-impedance return paths reduce noise coupling and improve thermal conduction to PCB ground plane. |
| OPENLED (2) | Open-LED fault indicator | Open-drain output pulled low when FB exceeds 1.22 V − 60 mV; requires external pull-up for status reporting. |
| PWM (3) | Digital dimming enable | Low disables switching and saves VC node state; internal pull-down allows floating-not-connected operation. |
| SHDN/UVLO (4) | Enable and undervoltage lockout | 1.22 V falling threshold with programmable hysteresis; enables precise power-on sequencing and brownout protection. |
| VIN (5) | Main input supply | Accepts 3–30 V; must be bypassed locally with ≥1 μF ceramic capacitor to suppress high-frequency switching noise. |
| SW (6) | Switch node | Connects to inductor; high dV/dt node requiring minimal trace area to limit EMI radiation. |
| ANODE (7) | Integrated Schottky anode | Internally connects to SW; eliminates discrete diode placement and parasitic inductance in boost path. |
| CATHODE (10) | Integrated Schottky cathode | Connects to LED string anode or output capacitor; completes internal boost rectification path. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current amplifier; senses voltage across external RSENSE with 250 mV full-scale threshold. |
| ISN (12) | Current sense negative input | Inverting input of current amplifier; referenced to LED string cathode or GND depending on topology. |
| FB (13) | Voltage feedback input | Regulates to 1.22 V; used for CV mode or open-LED detection; must not be left floating. |
| CTRL (14) | Current threshold adjust | Sets ISP–ISN threshold from 100 mV to 250 mV linearly; ties to VREF (2 V) for full-scale operation. |
| VREF (15) | 2 V precision reference | Supplies up to 100 μA; used to bias CTRL, PWM, or external circuitry; stable over VIN and temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode BOM line and layout area; reduces forward drop losses and improves thermal reliability in boost configurations. |
| Rail-to-rail current sense (0–45 V) | Enables LED string placement on either side of the converter (high-side or low-side sensing); supports buck, boost, SEPIC, and buck-boost topologies without reconfiguration. |
| True Color PWM™ dimming | Preserves LED chromaticity at all dimming levels by avoiding low-frequency current modulation artifacts; validated up to 3000:1 ratio. |
| Open-LED fault detection | Asserts OPENLED pin when FB rises within 60 mV of 1.22 V; provides fail-safe indication for safety-critical lighting (e.g., brake lamps, turn signals). |
| Programmable UVLO with hysteresis | Allows precise startup/shutdown thresholds using two external resistors; prevents oscillation during battery voltage sag or recovery. |
Applications
| Automotive Interior Lighting | Industrial Panel Backlighting |
|---|---|
Use Scenario: Driving white LED strings in instrument clusters, center consoles, and ambient lighting under 12 V battery supply with load-dump transients. IC Role / Device Role / Timing Role: Constant-current LED driver with 1 MHz switching, integrated Schottky, and open-LED fault reporting. Use Value: Reduces bill-of-materials count by eliminating external diode and compensation components; meets AEC-Q100 Grade 1 temperature requirements (–40°C to +125°C). | Use Scenario: Powering monochrome LED arrays in HMI panels, medical displays, and factory HMIs where consistent brightness and long life are critical. IC Role / Device Role / Timing Role: High-efficiency boost-mode LED driver with analog + PWM dimming support and rail-to-rail current sensing. Use Value: Enables smooth 3000:1 dimming without color shift; supports wide input (3–30 V) for universal AC/DC adapter compatibility. |
| Commercial Signage | Architectural Accent Lighting |
Use Scenario: Driving medium-power LED strips in retail signage with variable input (e.g., PoE-derived 5–24 V) and need for remote fault monitoring. IC Role / Device Role / Timing Role: SEPIC or buck-boost LED controller with OPENLED status pin and programmable UVLO. Use Value: Maintains regulated current despite input fluctuations; OPENLED signal interfaces directly with microcontroller GPIO for predictive maintenance alerts. | Use Scenario: Controlling warm-white and cool-white LED channels in tunable-white fixtures powered from 24 V DC distribution rails. IC Role / Device Role / Timing Role: Dual-channel-capable constant-current source with independent CTRL pin adjustment per channel. Use Value: Enables precise CCT tuning via analog dimming; 1 MHz operation minimizes audible noise and EMI in sensitive architectural environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMS#PBF | Higher switching frequency (up to 1.5 MHz), no integrated Schottky, requires external MOSFET and diode. | Better suited for high-efficiency, high-density designs where thermal management permits discrete power stage. | Select when board space allows discrete FET/diode and higher efficiency (>94%) is prioritized over BOM simplicity. |
| MAX16820ATB+T | Fixed 500 kHz frequency, 40 V switch, no integrated Schottky, analog-only dimming (no PWM). | Targeted at cost-sensitive industrial lighting with simpler dimming requirements and lower transient immunity needs. | Select when 3000:1 PWM dimming and 40 V transient tolerance are not required, and BOM cost is primary constraint. |
Compared with LTC3783EMS#PBF and MAX16820ATB+T, the LT3519IMS-1#PBF uniquely combines integrated Schottky diode, 1 MHz operation, rail-to-rail current sensing, and True Color PWM™ in a single MSOP-16 package-reducing design complexity and component count while meeting automotive transient and thermal requirements.
Availability
LT3519IMS-1#PBF is available at Aetrix Electronics and suitable for automotive interior lighting, industrial panel backlighting, commercial signage, and architectural accent lighting requiring stable component supply, AEC-Q100-compliant sourcing, and long-term production continuity.
Supply support for LT3519IMS-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 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LT3519 family.
The LT3519IMS-1#PBF belongs to Linear's high-reliability LED driver product line, designed specifically for automotive and industrial lighting systems demanding robust transient immunity, precise current regulation, and simplified system-level thermal design.
FAQ
What is the switching frequency of the LT3519IMS-1#PBF?
The LT3519IMS-1#PBF operates at a fixed 1 MHz switching frequency, as confirmed in the Electrical Characteristics table of the 3519fa datasheet. This frequency enables compact magnetic design and reduced output ripple compared to lower-frequency alternatives like the base LT3519 (400 kHz) or LT3519-2 (2.2 MHz).
Does the LT3519IMS-1#PBF include an integrated Schottky diode?
Yes, the LT3519IMS-1#PBF integrates a Schottky diode with anode (Pin 7) and cathode (Pin 10) terminals. The datasheet specifies a typical forward drop of 0.8 V at 500 mA and leakage current of 4 μA at 24 V reverse bias-confirmed in the Electrical Characteristics section.
Can the LT3519IMS-1#PBF drive LEDs in buck configuration?
Yes, the LT3519IMS-1#PBF supports buck, boost, SEPIC, and buck-boost topologies. Figure TA04a in the datasheet shows a validated buck-mode 500 mA LED driver application, leveraging the rail-to-rail ISP/ISN inputs and flexible feedback architecture to regulate current in low-side or high-side configurations.
What is the maximum PWM dimming ratio supported by the LT3519IMS-1#PBF?
The LT3519IMS-1#PBF supports up to 3000:1 PWM dimming ratio, as stated in the Features section and verified in Typical Application TA05b (boost mode) and TA04b (buck mode). This is achieved using external PWM signal timing aligned to the 1 MHz internal oscillator.
How does open-LED protection work on the LT3519IMS-1#PBF?
The LT3519IMS-1#PBF asserts the OPENLED pin (Pin 2) low when the FB pin voltage rises within ~60 mV of its 1.22 V regulation threshold-indicating loss of LED load. This behavior is documented in the PIN FUNCTIONS section and validated in Typical Application TA03b waveform capture.
LT3519IMS-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
LT3519IMS-1#PBF FAQ
1.How can I place an order for LT3519IMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519IMS-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 LT3519IMS-1#PBF reliable?
The price and inventory of LT3519IMS-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 LT3519IMS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT3519IMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519IMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519IMS-1#PBF?
LT3519IMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519IMS-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 LT3519IMS-1#PBF?
For technical support, including LT3519IMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519IMS-1#PBF requirements.
6.How does Aetrix verify that LT3519IMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT3519IMS-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 LT3519IMS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT3519IMS-1#PBF?
All LT3519IMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519IMS-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 LT3519IMS-1#PBF part is unused and in its original packaging.
Return procedure for LT3519IMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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