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Analog Devices Inc. LT3519IMS-1#TRPBF
- Part No.:
- LT3519IMS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519IMS-1#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,466
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Product details
Overview
LT3519IMS-1#TRPBF 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 sense (0V–45V), open LED protection, and programmable UVLO. It is used in automotive interior lighting, industrial status indicators, and backlighting for displays requiring high dimming ratio.
For engineers reviewing the LT3519IMS-1#TRPBF datasheet, LT3519IMS-1#TRPBF pinout, LT3519IMS-1#TRPBF application, or LT3519IMS-1#TRPBF equivalent, key selection considerations include switching frequency (1 MHz), internal Schottky integration, 3000:1 True Color PWM™ dimming capability, rail-to-rail ISP/ISN voltage range, and MSOP-16 automotive-grade packaging with –40°C to 125°C operation.
Technical Context
The LT3519IMS-1#TRPBF implements current-mode control with dual feedback loops: one for voltage regulation (FB pin, 1.22 V reference) and one for current regulation (ISP/ISN differential sensing, threshold adjustable via CTRL pin). Its internal 1 MHz oscillator enables compact magnetics and reduced output ripple in space-constrained LED applications.
It operates across topologies including boost, SEPIC, buck-boost, and buck modes. The OPENLED status pin provides fault reporting when FB exceeds 1.16 V (i.e., ~60 mV below regulation), and SHDN/UVLO offers programmable hysteresis using an external resistor divider and internal 2.2 µA pull-down current.
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 vs. lower-frequency alternatives. |
| Internal Switch Rating | 45 V / 750 mA - Supports LED strings up to ~38 V output in boost mode with margin for transients; eliminates need for external high-voltage MOSFET. |
| Current Sense Range | Rail-to-rail 0 V to 45 V on ISP/ISN - Allows direct sensing across LED string regardless of cathode/anode configuration; supports buck, boost, and buck-boost layouts without level-shifting. |
| PWM Dimming Ratio | Up to 3000:1 - Achieves precise grayscale control in automotive and display applications without color shift; requires external MOSFET disconnect for full spec compliance. |
| CTRL Pin Threshold | Adjustable 100 mV to 250 mV - Enables linear analog dimming; 250 mV full-scale corresponds to ILED = 250 mV / RSENSE, supporting accurate current programming down to ~10 mA with 1% RSENSE. |
| Operating Temperature | –40°C to +125°C junction - Qualified for under-hood automotive and industrial environments; no derating required within this range. |
| Package | 16-Lead MSOP - Exposed pad variant (IMS) improves thermal performance over standard EMS; compatible with automated SMT assembly and reflow profiles. |
Pinout & Package
LT3519IMS-1#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (IMS grade), optimized for thermal dissipation in high-current LED driver applications. Pin numbering follows standard top-view MSOP layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground reference | Four dedicated GND pins reduce ground impedance and improve thermal conduction; must be tied to solid PCB ground plane. |
| OPENLED (2) | Open-collector fault status output | Pulls low when FB ≥ 1.16 V - indicates open LED condition; requires external pull-up for logic-level interfacing with microcontrollers or fault monitors. |
| PWM (3) | Dimming enable/disable control | Active-low input disables switching and preserves VC node state; internal pull-down allows floating connection; ties to VREF if unused. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout input | 1.22 V falling threshold with user-programmable hysteresis; sub-µA bias current above threshold minimizes quiescent power loss. |
| VIN (5) | Main input supply (3 V–30 V continuous) | Must be bypassed with ≥1 µF ceramic capacitor placed adjacent to pin; withstands 40 V transient for 1 s per absolute max rating. |
| SW (6) | Switch node connection | Connects to inductor; high dV/dt node - trace must be short and shielded from sensitive analog signals (e.g., ISP/ISN, FB, CTRL). |
| ANODE (7) | Integrated Schottky anode terminal | Internally connected to SW; used in boost/SEPIC configurations; eliminates discrete diode placement and parasitic inductance. |
| ISP (11) | Current sense positive input | Non-inverting input of rail-to-rail current sense amplifier; bias current increases with (VISP – VISN) - keep routing away from SW and GND noise. |
| ISN (12) | Current sense negative input | Inverting input of current sense amplifier; forms Kelvin pair with ISP for accurate RSENSE measurement independent of PCB trace resistance. |
| FB (13) | Voltage feedback input | Regulates to 1.22 V nominal; used for CV mode or open-LED detection; must not be left floating - tie to GND if unused. |
| CTRL (14) | Current threshold adjustment | Sets VISP–VISN threshold from 100 mV to 250 mV; connects directly to VREF for full-scale; linear analog dimming interface. |
| VREF (15) | 2.0 V precision reference output | Supplies up to 100 µA; used to bias CTRL, PWM, or external circuitry; regulated against VIN and temperature variations. |
| CATHODE (10) | Integrated Schottky cathode terminal | Connects to LED string cathode in boost mode; internally tied to internal Schottky - no external diode required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 45 V / 750 mA switch + Schottky diode | Reduces BOM count by two components and eliminates layout sensitivity to external diode parasitics in boost topology. |
| Rail-to-rail ISP/ISN sensing (0 V–45 V) | Enables direct current sensing in buck, boost, SEPIC, and buck-boost configurations without op-amp level shifters or isolated supplies. |
| True Color PWM™ dimming (up to 3000:1) | Maintains consistent LED chromaticity across dimming range by preserving PWM waveform fidelity and minimizing recovery time via VC node hold. |
| Programmable UVLO with hysteresis | Allows precise system-level brown-out management using only two external resistors and internal 2.2 µA current source - no external comparator needed. |
| Open LED fault detection with OPENLED pin | Provides immediate hardware-level fault signaling without MCU polling; latched behavior during PWM idle ensures reliable status capture. |
| Internal compensation network | Eliminates external compensation components (e.g., Type II/III networks), reducing design cycle time and board area while ensuring stability across operating conditions. |
Applications
| Automotive Interior Lighting | Industrial Panel Indicators |
|---|---|
Use Scenario: Driving white LED strings in vehicle door handles, footwells, and center consoles with 12 V battery supply and 40 V load dump tolerance. IC Role / Device Role / Timing Role: Constant-current LED driver with 1 MHz switching, integrated Schottky, and open-LED fault reporting for functional safety compliance. Use Value: Eliminates need for external high-voltage MOSFET and diode; meets AEC-Q100 Grade 1 requirements via –40°C to 125°C operation and robust UVLO hysteresis. |
Use Scenario: Powering status LEDs on PLC I/O modules and HMI panels where ambient temperature ranges from –40°C to +85°C and long-term reliability is critical. IC Role / Device Role / Timing Role: High-efficiency, thermally robust LED driver supporting analog + PWM dimming for operator visibility control. Use Value: MSOP-16 IMS package delivers superior thermal performance vs. SOIC; rail-to-rail ISP/ISN enables flexible PCB layout in dense industrial enclosures. |
| Display Backlighting | Architectural Accent Lighting |
Use Scenario: Driving parallel LED strings in LCD monitor backlights requiring flicker-free dimming and tight current matching across channels. IC Role / Device Role / Timing Role: Precision current regulator with 250 mV sense threshold and <±1% FB reference for stable brightness control. Use Value: 3000:1 True Color PWM™ ensures no visible color shift at low brightness; CTRL pin enables hybrid dimming for extended dynamic range. |
Use Scenario: Controlling RGBW LED strips in commercial building façades where wide input range (6 V–30 V) accommodates PoE-powered or 24 V DC systems. IC Role / Device Role / Timing Role: Multi-topology LED controller supporting buck-boost mode to maintain regulation as input voltage varies with solar/battery sources. Use Value: Single IC supports multiple configurations (boost/SEPIC/buck-boost); reduces inventory SKUs and simplifies firmware across lighting product families. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3519IMS#TRPBF | 400 kHz switching frequency; lower switching losses but requires larger inductor (e.g., 68 µH) and output capacitor. | Better suited for cost-sensitive, low-EMI applications where board space is less constrained. | Select when efficiency at light loads or EMI compliance at lower frequencies is prioritized over size. |
| LT3519IMS-2#TRPBF | 2.2 MHz switching frequency; enables ultra-compact designs (e.g., 6.8 µH inductor) but increases switching losses and gate drive demand. | Ideal for portable or space-limited lighting modules where minimal footprint outweighs thermal trade-offs. | Select when PCB area is premium and thermal management is handled externally (e.g., metal-core PCB). |
Compared with LT3519IMS#TRPBF and LT3519IMS-2#TRPBF, the LT3519IMS-1#TRPBF strikes a balance between component size (15 µH typical), thermal performance, and EMI profile - making it the default choice for mainstream automotive and industrial LED drivers where 1 MHz optimizes both layout and efficiency.
Availability
LT3519IMS-1#TRPBF is available at Aetrix Electronics and suitable for automotive interior lighting, industrial panel indicators, and display backlighting requiring stable component supply, AEC-Q100-compliant sourcing, and long-term production continuity.
Supply support for LT3519IMS-1#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LT3519 family was designed specifically for robust, multi-topology LED driving in harsh environments - emphasizing integrated protection (open LED, UVLO, thermal foldback), wide input range (3 V–30 V), and high dimming fidelity for automotive and industrial human-machine interfaces.
FAQ
What is the switching frequency of the LT3519IMS-1#TRPBF?
The LT3519IMS-1#TRPBF operates at a fixed 1 MHz switching frequency. This value is factory-trimmed and does not require external timing components. It enables compact magnetic design - for example, a 15 µH inductor suffices in typical boost configurations - while maintaining high efficiency (>88%) across 12 V input and 24 V LED string loads. The 1 MHz frequency is specific to the "-1" variant; LT3519IMS#TRPBF runs at 400 kHz and LT3519IMS-2#TRPBF at 2.2 MHz.
Does the LT3519IMS-1#TRPBF include an integrated Schottky diode?
Yes, the LT3519IMS-1#TRPBF integrates a Schottky diode rated for 45 V reverse voltage and 500 mA forward current (0.8 V typical drop at 500 mA). Its anode (Pin 7) and cathode (Pin 10) are brought out separately, enabling direct connection in boost, SEPIC, and buck-boost topologies without external diodes. This integration reduces bill-of-materials count, PCB area, and layout sensitivity to diode parasitics - a key differentiator versus discrete switch + diode solutions.
How does open LED detection work on the LT3519IMS-1#TRPBF?
The LT3519IMS-1#TRPBF monitors the FB pin voltage and asserts the OPENLED pin (Pin 2) low when FB rises to within ~60 mV of its 1.22 V regulation threshold (i.e., ≥1.16 V). This occurs when the LED string opens and the feedback divider sees full output voltage. OPENLED is an open-collector output requiring an external pull-up resistor. During PWM idle periods, the state is latched, ensuring fault capture even during dimming cycles - a feature critical for automotive diagnostics and fail-safe lighting systems.
Can the LT3519IMS-1#TRPBF operate in buck mode?
Yes, the LT3519IMS-1#TRPBF supports buck mode operation using an external PNP transistor (e.g., FMMT555) referenced to the input rail. In this configuration, the IC regulates LED current via ISP/ISN sensing while the PNP handles high-side switching. The datasheet provides Figure 2 and design equations for setting the open-LED threshold and calculating RSENSE. Buck mode is commonly used for low-VF LED strings (e.g., 6 V) supplied from higher input rails (e.g., 12 V–30 V), delivering >80% efficiency with minimal external components.
What is the purpose of the CTRL pin on the LT3519IMS-1#TRPBF?
The CTRL pin (Pin 14) adjusts the current sense threshold voltage (VISP–VISN) from 100 mV to 250 mV, enabling linear analog dimming. At VCTRL = 2.0 V (tied to VREF), the threshold is 250 mV, yielding ILED = 250 mV / RSENSE. At VCTRL = 0.5 V, ILED ≈ 25 mV / RSENSE. This pin must never be left floating - tie to VREF if unused. Combined with PWM dimming, CTRL extends total dimming range beyond 3000:1, supporting high-fidelity brightness control in premium lighting applications.
LT3519IMS-1#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:
- 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#TRPBF FAQ
1.How can I place an order for LT3519IMS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519IMS-1#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-1#TRPBF reliable?
The price and inventory of LT3519IMS-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519IMS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519IMS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519IMS-1#TRPBF?
LT3519IMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519IMS-1#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-1#TRPBF?
For technical support, including LT3519IMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519IMS-1#TRPBF requirements.
6.How does Aetrix verify that LT3519IMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519IMS-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519IMS-1#TRPBF?
All LT3519IMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519IMS-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3519IMS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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