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Analog Devices Inc. LT3519IMS#TRPBF
- Part No.:
- LT3519IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519IMS#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
LT3519IMS#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency 400kHz 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 LED current sensing (0V–45V), programmable undervoltage lockout, and open-LED fault detection. It is used in automotive interior lighting, industrial status indicators, and high-reliability backlighting systems.
For engineers reviewing the LT3519IMS#TRPBF datasheet, LT3519IMS#TRPBF pinout, LT3519IMS#TRPBF application, or LT3519IMS#TRPBF equivalent, key selection criteria include its 400kHz switching frequency, internal Schottky diode integration, 3V–30V input range, 3000:1 True Color PWM™ dimming capability, and MSOP-16 automotive-grade packaging.
Technical Context
The LT3519IMS#TRPBF 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 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 an internal 45V/750mA N-channel MOSFET switch, integrated Schottky diode (0.8V forward drop at 500mA), and dedicated OPENLED open-collector fault indicator. The CTRL pin linearly adjusts current-sense threshold (100mV–250mV), while PWM pin enables up to 3000:1 dimming with stored VC-node state for fast transient recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 400kHz - Enables compact magnetics and EMI filtering; optimized for boost/buck-boost topologies with 68μH inductor. |
| Input Voltage Range | 3V to 30V continuous - Supports wide automotive battery range (cold crank to load dump); withstands 40V transients. |
| Internal Switch Rating | 45V VDS, 750mA ISW - Sufficient for driving 38V LED strings in boost mode without external FET. |
| Current Sense Range | Rail-to-rail 0V–45V - Allows direct sensing in high-side, low-side, or floating configurations without level-shifting. |
| LED Dimming Ratio | Up to 3000:1 via PWM pin - Achieves flicker-free, high-fidelity color rendering in automotive ambient lighting. |
| Operating Temperature | –40°C to +125°C junction - Qualified for under-hood and dashboard applications per AEC-Q100 stress requirements. |
| Package | 16-Lead MSOP - Thermally enhanced plastic package with four GND pins for low-impedance grounding and thermal dissipation. |
Pinout & Package
LT3519IMS#TRPBF is housed in a 16-lead plastic MSOP package (θJA = 130°C/W) with exposed pad for thermal enhancement. Four GND pins (1, 8, 9, 16) provide low-inductance return paths and improve thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground | Multiple GND connections reduce ground bounce and improve stability in high-di/dt LED drive circuits. |
| OPENLED (2) | Open-LED fault indicator | Open-drain output pulled low when FB exceeds 1.22V – 60mV; requires external pull-up for system-level fault reporting. |
| PWM (3) | Pulse-width modulation control | Disables switching and preserves VC node charge during off-time; enables precise 3000:1 dimming without recovery delay. |
| SHDN/UVLO (4) | Shutdown and UVLO input | 1.22V falling threshold with user-programmable hysteresis; sub-μA shutdown current (<1μA) extends battery life. |
| VIN (5) | Main power input | Accepts 3V–30V; requires local 1μF ceramic bypass capacitor placed adjacent to minimize input ripple and EMI. |
| SW (6) | Switch node | Connects to inductor; high dv/dt node requiring minimal trace length and area to suppress radiated emissions. |
| ANODE (7) | Integrated Schottky anode | Internal connection to Schottky diode anode; eliminates external diode in boost topology, reducing BOM count. |
| 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 to measure RSENSE voltage. |
| 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 adjust | Sets VISP–VISN threshold from 100mV to 250mV; tied to VREF for full-scale 250mV 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. |
| CATHODE (10) | Integrated Schottky cathode | Internal connection to Schottky cathode; connects to LED string anode in boost configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode in boost designs, reducing component count, board space, and thermal losses (0.8V VF @ 500mA). |
| Rail-to-rail current sense | Supports LED string placement anywhere in the power path (high-side, low-side, or floating) without additional op-amps or level shifters. |
| True Color PWM™ dimming | Preserves LED chromaticity across 3000:1 intensity range by maintaining consistent forward current during PWM on-cycles. |
| Open-LED fault detection | Dedicated OPENLED pin provides system-level fault signaling with latch behavior during PWM idle periods. |
| Programmable UVLO with hysteresis | Enables robust start-up sequencing in automotive environments using two external resistors and internal 2.2μA pull-down current. |
Applications
| Automotive Interior Lighting | Industrial Status Indicators |
|---|---|
Use Scenario: Driving white LED strips for door sill illumination, footwell lighting, and center console backlighting in vehicles. IC Role / Device Role / Timing Role: Constant-current LED driver with 400kHz switching, integrated Schottky, and open-LED fault reporting. Use Value: Eliminates external diode and reduces BOM cost by 2 components; 3000:1 dimming meets OEM ambient lighting specifications. |
Use Scenario: Powering red/green status LEDs on PLC I/O modules, HMI panels, and safety-rated control cabinets. IC Role / Device Role / Timing Role: Robust CV/CC LED driver with –40°C to +125°C operation and 40V transient tolerance. Use Value: Guarantees reliable LED visibility across industrial temperature extremes and brown-out conditions. |
| High-Voltage Boost Backlighting | Multi-Topology LED Driver |
Use Scenario: Driving 38V, 100mA LED strings in medical display backlighting where EMI and reliability are critical. IC Role / Device Role / Timing Role: Fixed-frequency boost converter with rail-to-rail current sensing and internal compensation. Use Value: Achieves >92% efficiency at 12V input and simplifies design with no external compensation network required. |
Use Scenario: Configurable LED driver supporting boost, buck, SEPIC, and buck-boost topologies in shared PCB platforms. IC Role / Device Role / Timing Role: Flexible topology IC with independent ISP/ISN sensing and FB-based voltage regulation. Use Value: Reduces SKU count by enabling single hardware design to support multiple LED string voltages and configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3519EMS#TRPBF | Same electrical specs but E-grade (0°C to +125°C) vs I-grade; MSOP-16 package identical. | Not qualified for extended automotive temperature range; unsuitable for under-hood use. | Select LT3519IMS#TRPBF for automotive cabin or industrial applications requiring –40°C startup. |
| LT3519-1IMS#TRPBF | 1MHz switching frequency (vs 400kHz); same pinout, package, and feature set. | Enables smaller inductors (e.g., 15μH vs 68μH) and faster transient response; higher switching loss at high current. | Choose LT3519IMS#TRPBF when EMI constraints favor lower frequency or when optimizing for peak efficiency >92% at mid-load. |
Compared with LT3519EMS#TRPBF, the LT3519IMS#TRPBF guarantees –40°C operation and is preferred for automotive cabin lighting; compared with LT3519-1IMS#TRPBF, it delivers higher efficiency in 6–24V input ranges due to lower gate drive and conduction losses at 400kHz.
Availability
LT3519IMS#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, industrial status indicators, and high-reliability LED backlighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned qualification.
Supply support for LT3519IMS#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 full product support, datasheets, and application engineering for legacy Linear parts including the LT3519 family.
The LT3519 series was designed specifically for high-efficiency, multi-topology LED driving in harsh environments-emphasizing integrated protection (open-LED, UVLO), wide input range, and automotive-grade reliability.
FAQ
What is the switching frequency of the LT3519IMS#TRPBF?
The LT3519IMS#TRPBF operates at a fixed 400kHz switching frequency. This frequency balances efficiency, inductor size, and EMI performance for automotive and industrial LED applications. It is factory-trimmed and does not require external timing components. The LT3519IMS#TRPBF variant is distinct from the LT3519-1IMS#TRPBF (1MHz) and LT3519-2IMS#TRPBF (2.2MHz), which share the same pinout but differ in oscillator frequency and associated efficiency trade-offs.
Does the LT3519IMS#TRPBF include an integrated Schottky diode?
Yes, the LT3519IMS#TRPBF integrates a Schottky diode with 0.8V forward voltage at 500mA and 4μA leakage at 24V. This eliminates the need for an external diode in boost configurations, reducing bill-of-materials count and PCB area. The anode (Pin 7) and cathode (Pin 10) are brought out separately to support flexible layout and thermal management. The LT3519IMS#TRPBF's integrated diode is rated for continuous operation up to 45V reverse voltage.
How does open-LED protection work on the LT3519IMS#TRPBF?
The LT3519IMS#TRPBF uses its FB pin to detect open-LED conditions: when the FB voltage rises within ~60mV of its 1.22V regulation threshold (i.e., ≥1.16V), the OPENLED pin pulls low. This open-drain signal requires an external pull-up resistor and latches its state during PWM idle periods. The LT3519IMS#TRPBF's OPENLED function is fully integrated-no external comparators or timers are needed-and works identically across boost, buck, and buck-boost topologies when FB is properly configured.
Can the LT3519IMS#TRPBF operate in buck mode?
Yes, the LT3519IMS#TRPBF supports buck, boost, SEPIC, and buck-boost topologies. In buck mode, the LED string connects between ANODE (Pin 7) and GND, while CATHODE (Pin 10) ties to VIN. Current sensing remains across ISP/ISN, and FB regulates output voltage. Application Note 3519FA shows a validated 500mA buck-mode design with 90% efficiency at 20V input. The LT3519IMS#TRPBF's rail-to-rail current sense and dual-loop architecture make topology reconfiguration straightforward via external component changes only.
What is the purpose of the CTRL pin on the LT3519IMS#TRPBF?
The CTRL pin on the LT3519IMS#TRPBF sets the current-sense threshold voltage across the external sense resistor (RSENSE). At CTRL = 2.0V (VREF), the threshold is 250mV; at CTRL = 100mV, it is 100mV-enabling linear analog dimming. Voltages between 1.0V and 1.2V enter a nonlinear region per the VISP–VISN vs VCTRL curve. The LT3519IMS#TRPBF's CTRL pin must never be left floating; tie to VREF if unused. This pin directly scales LED current without altering loop dynamics or compensation.
LT3519IMS#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:
- 400kHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3519IMS#TRPBF FAQ
1.How can I place an order for LT3519IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519IMS#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 LT3519IMS#TRPBF reliable?
The price and inventory of LT3519IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3519IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519IMS#TRPBF?
LT3519IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519IMS#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 LT3519IMS#TRPBF?
For technical support, including LT3519IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519IMS#TRPBF requirements.
6.How does Aetrix verify that LT3519IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519IMS#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 LT3519IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519IMS#TRPBF?
All LT3519IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519IMS#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 LT3519IMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3519IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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