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Analog Devices Inc. LT3519IMS-2#PBF
- Part No.:
- LT3519IMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519IMS-2#PBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
LT3519IMS-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 delivers constant-current or constant-voltage regulation for automotive and industrial LED lighting, supports rail-to-rail current sensing from 0V to 45V, and enables up to 3000:1 True Color PWM™ dimming with external PWM input.
For engineers reviewing the LT3519IMS-2#PBF datasheet, LT3519IMS-2#PBF pinout, LT3519IMS-2#PBF application, or LT3519IMS-2#PBF equivalent, key selection criteria include switching frequency (2.2MHz), internal Schottky integration, open-LED fault detection via OPENLED pin, programmable UVLO hysteresis, and compatibility with boost/SEPIC/buck-boost/buck topologies.
Technical Context
The LT3519IMS-2#PBF employs current-mode control with internal compensation and dual-loop regulation-voltage feedback via FB pin (1.22V reference) and rail-to-rail current sense via ISP/ISN pins. Its error amplifier selects between loops based on which demands lower peak switch current, enabling seamless transition between constant-current and constant-voltage modes.
It features a 2.2MHz oscillator (LT3519-2 variant), 93% maximum duty cycle, 750mA switch current limit, and dedicated CTRL pin for linear analog dimming (0.1V–1.2V input adjusts VISP–VISN threshold from 0mV to 250mV). The OPENLED pin provides open-circuit LED status with latched reporting during PWM idle periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - Enables compact magnetics and output filtering; reduces EMI energy at fundamental frequency. |
| Internal Switch Rating | 45V VDS, 750mA ISW - Supports LED strings up to ~38V output in boost mode with margin for transients. |
| Integrated Schottky Diode | Forward drop ≤0.8V @ 500mA - Eliminates external diode, saves board space and conduction losses in boost topology. |
| Current Sense Range | Rail-to-rail 0V–45V across ISP/ISN - Allows LED cathode/anode placement flexibility in buck, boost, and SEPIC configurations. |
| PWM Dimming Ratio | Up to 3000:1 - Achieved with external PWM signal; preserves color fidelity via True Color PWM™ architecture. |
| CTRL Pin Dimming | Analog adjustment of LED current threshold from 0.1V to 1.2V - Enables fine-grained dimming without external DAC. |
| Open LED Detection | FB voltage > (1.22V – 60mV) asserts OPENLED low - Provides fail-safe status for disconnected LED strings. |
Pinout & Package
LT3519IMS-2#PBF is housed in a 16-lead plastic MSOP package (3mm × 4.9mm, 0.5mm pitch) with exposed pad for thermal dissipation. The package supports –40°C to +125°C junction temperature operation and features four GND pins (1, 8, 9, 16) for low-impedance grounding and improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground reference | Multiple GND pins reduce ground impedance and improve thermal conduction to PCB copper plane. |
| OPENLED (2) | Open-LED status output | Open-drain output pulled low when FB exceeds 1.16V; requires external pull-up for logic-level reporting. |
| PWM (3) | Dimming enable/disable control | Low disables switching and saves VC node state; internal pull-down allows direct MCU GPIO connection. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout | 1.22V falling threshold with user-programmable hysteresis via resistor divider; <1μA shutdown current. |
| VIN (5) | Main input supply (3V–30V continuous) | Must be bypassed with ≥1μF ceramic capacitor placed adjacent to pin to suppress high-frequency noise. |
| SW (6) | Switch node connection | Connects to inductor; trace must be short and wide to minimize EMI and switching losses. |
| ANODE (7) | Internal Schottky anode terminal | Connected internally to SW; used only in boost/SEPIC; not accessible externally in buck mode. |
| 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; forms differential pair with ISP for LED current measurement. |
| 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 programming | Sets VISP–VISN threshold from 0mV to 250mV; ties to VREF (2V) for full-scale operation. |
| VREF (15) | 2.0V precision reference output | Supplies up to 100μA; used for CTRL biasing, UVLO divider, or external circuitry requiring stable reference. |
| CATHODE (10) | Internal Schottky cathode terminal | Connected internally to output capacitor; serves as return path for Schottky current in boost configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 45V/750mA power switch + Schottky diode | Reduces BOM count by two components and eliminates layout sensitivity of external diode placement. |
| Rail-to-rail current sense (0V–45V) | Enables flexible LED string placement-cathode-grounded (buck), anode-grounded (boost), or floating (SEPIC). |
| True Color PWM™ dimming (up to 3000:1) | Maintains consistent LED chromaticity across dimming range by preserving PWM waveform integrity. |
| Programmable UVLO with hysteresis | Allows precise start-up and shut-down thresholds using external resistors; prevents brown-out oscillation. |
| Open-LED fault detection with latched status | Reports open-circuit condition even during PWM low phase, improving system reliability in automotive lighting. |
| Internal compensation | Eliminates need for external compensation network; simplifies design and improves stability across load conditions. |
Applications
| Automotive Headlamp Driver | Industrial Panel Backlight |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays in 12V vehicle electrical systems with transient immunity up to 40V. IC Role / Device Role / Timing Role: Constant-current LED driver operating in boost mode with 2.2MHz switching to minimize EMI in safety-critical cabin electronics. Use Value: Integrated Schottky and 45V switch enable single-chip solution for 38V LED strings; OPENLED pin provides ASIL-B-compatible fault reporting. |
Use Scenario: Powering uniform edge-lit LCD backlights in factory HMIs and control panels with wide input (6–30V DC). IC Role / Device Role / Timing Role: Constant-current source in buck-boost configuration to maintain brightness across varying input voltages and LED forward voltage drift. Use Value: Rail-to-rail ISP/ISN sensing allows cathode- or anode-referenced LED strings; CTRL pin enables smooth analog dimming without flicker. |
| Commercial Signage Lighting | Emergency Exit Sign Driver |
|
Use Scenario: Driving multi-string RGB LED modules in outdoor signage with ambient temperature range –40°C to +85°C. IC Role / Device Role / Timing Role: Multi-topology LED controller supporting SEPIC for wide VIN/VOUT ratio and PWM dimming synchronized to video frame rate. Use Value: 2.2MHz operation allows use of 15μH inductors and 2.2μF ceramic output caps; internal compensation ensures stable loop over temperature. |
Use Scenario: Reliable LED driver for battery-backed emergency exit signs requiring >10-year lifetime and fail-safe open-LED detection. IC Role / Device Role / Timing Role: Constant-current source with UVLO hysteresis and latched OPENLED reporting to meet UL 924 requirements. Use Value: <1μA shutdown current extends backup battery life; 125°C rated MSOP package withstands enclosed fixture temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3519IMS#PBF | 400kHz switching frequency; 97% max duty cycle; same pinout and feature set. | Better efficiency at low input voltages (<8V); larger inductors/caps required; higher EMI at fundamental. | Select when board space permits larger magnetics and lower-frequency EMI filtering is preferred. |
| LT3519IMS-1#PBF | 1MHz switching frequency; 93% max duty cycle; identical thermal and electrical specs otherwise. | Balance of size, efficiency, and EMI; suitable for mid-range LED power (1–3W) with 47μH inductors. | Choose for general-purpose LED drivers where 2.2MHz may over-specify EMI filter requirements. |
Compared with LT3519IMS#PBF and LT3519IMS-1#PBF, the LT3519IMS-2#PBF offers the highest switching frequency (2.2MHz), enabling smallest passive components and fastest transient response-but requires tighter layout control for EMI and higher gate drive losses in the internal switch.
Availability
LT3519IMS-2#PBF is available at Aetrix Electronics and suitable for automotive headlamps, industrial HMIs, commercial signage, and emergency lighting requiring stable component supply, AEC-Q200-aligned reliability, and extended temperature operation.
Supply support for LT3519IMS-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 and maintains its legacy of high-performance analog ICs for power management, signal conditioning, and precision timing.
The LT3519 family was designed specifically for robust, high-efficiency LED driving in harsh environments-emphasizing integrated protection (open-LED, UVLO, overcurrent), multi-topology flexibility, and automotive-grade thermal performance.
FAQ
What is the switching frequency of the LT3519IMS-2#PBF?
The LT3519IMS-2#PBF operates at a fixed 2.2MHz switching frequency, as designated by the "-2" suffix. This enables compact external components-such as 15μH inductors and 2.2μF ceramic output capacitors-and shifts EMI energy above sensitive AM radio bands. The frequency is trimmed and guaranteed over temperature and line variations per the Electrical Characteristics table.
Does the LT3519IMS-2#PBF require external compensation components?
No, the LT3519IMS-2#PBF features internal compensation, eliminating the need for external RC networks on the COMP or VC node. This simplifies layout, reduces BOM count, and ensures stable loop response across load, input voltage, and temperature ranges without tuning.
How does open-LED detection work on the LT3519IMS-2#PBF?
The LT3519IMS-2#PBF monitors the FB pin voltage. When FB rises within ~60mV of its 1.22V regulation threshold (i.e., >1.16V), the OPENLED pin pulls low. This open-drain output requires an external pull-up resistor and provides latched fault reporting-even during PWM low periods-to indicate LED string disconnection.
Can the LT3519IMS-2#PBF drive LEDs in buck configuration?
Yes, the LT3519IMS-2#PBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, the LED string connects between ANODE and GND, while CATHODE is tied to the output node. The rail-to-rail ISP/ISN inputs allow accurate current sensing regardless of LED string polarity relative to ground.
What is the purpose of the CTRL pin on the LT3519IMS-2#PBF?
The CTRL pin on the LT3519IMS-2#PBF sets the current-sense threshold voltage (VISP–VISN) linearly from 0mV to 250mV. Applying 0.1V–1.0V yields proportional analog dimming; ≥1.2V clamps to full-scale 250mV. It enables precise LED current control without external DACs and must not be left floating.
LT3519IMS-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
LT3519IMS-2#PBF FAQ
1.How can I place an order for LT3519IMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519IMS-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 LT3519IMS-2#PBF reliable?
The price and inventory of LT3519IMS-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 LT3519IMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT3519IMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519IMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519IMS-2#PBF?
LT3519IMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519IMS-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 LT3519IMS-2#PBF?
For technical support, including LT3519IMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519IMS-2#PBF requirements.
6.How does Aetrix verify that LT3519IMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT3519IMS-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 LT3519IMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT3519IMS-2#PBF?
All LT3519IMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519IMS-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 LT3519IMS-2#PBF part is unused and in its original packaging.
Return procedure for LT3519IMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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