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Analog Devices Inc. LT3519IMS-2#TRPBF
- Part No.:
- LT3519IMS-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519IMS-2#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,167
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Product details
Overview
LT3519IMS-2#TRPBF 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 supports constant-current and constant-voltage regulation, rail-to-rail current sensing (0–45V), programmable undervoltage lockout, and open-LED fault detection. Designed for automotive LED lighting systems requiring high dimming ratio and transient robustness.
For engineers reviewing the LT3519IMS-2#TRPBF datasheet, LT3519IMS-2#TRPBF pinout, LT3519IMS-2#TRPBF application, or LT3519IMS-2#TRPBF equivalent, this page delivers verified technical context, real-world topology support (boost/SEPIC/buck-boost/buck), true-color PWM dimming up to 3000:1, and validated alternative selection guidance - all grounded in the official Linear Technology LTC3519-2 datasheet (3519fa).
Technical Context
The LT3519IMS-2#TRPBF implements current-mode control with internal compensation and dual-loop feedback: voltage loop via FB pin (1.22V reference) and rail-to-rail current-sense loop via ISP/ISN pins. Its 2.2MHz switching frequency enables compact magnetics and low-output-ripple designs suitable for space-constrained automotive modules.
It features a unique CTRL pin that linearly adjusts the current-sense threshold (100mV–250mV) for analog dimming, while the PWM pin enables synchronous external pulse control with stored VC-node state for sub-μs recovery. Open-LED status is reported via an open-drain OPENLED pin asserting when FB exceeds VFB − 60mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - Enables use of ≤10μH inductors and ceramic output capacitors under 3.3μF, reducing board area and EMI filter complexity. |
| Internal Switch Rating | 45V VDS, 750mA ISW - Supports LED strings up to ~38V with margin for transients; eliminates need for external MOSFET in mid-power automotive applications. |
| Integrated Schottky | 0.8V forward drop at 500mA - Reduces conduction loss and component count vs discrete diode solutions in boost topologies. |
| Current Sense Range | Rail-to-rail 0V–45V across ISP/ISN - Allows direct high-side or low-side sense resistor placement without level-shifting circuitry. |
| PWM Dimming Ratio | Up to 3000:1 - Achieved via synchronized external PWM with internal VC-node retention, enabling flicker-free illumination in instrument clusters and DRLs. |
| CTRL Pin Dimming | Linear 100mV–250mV threshold adjustment - Provides analog dimming capability independent of PWM timing, supporting smooth brightness transitions. |
| Operating Temp Range | −40°C to +125°C junction - Qualified for under-hood automotive environments per AEC-Q100 stress test requirements. |
Pinout & Package
LT3519IMS-2#TRPBF is housed in a 16-lead plastic MSOP package (3mm × 4.9mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is marked by a dot; GND pins (1, 8, 9, 16) must be tied to a low-impedance ground plane for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground reference | Four dedicated ground pins minimize ground bounce and improve thermal dissipation; connect directly to PCB ground plane. |
| OPENLED (2) | Open-collector fault status output | Asserts low when FB ≥ (1.22V − 60mV); requires external pull-up to report open-LED condition to microcontroller or monitoring circuit. |
| PWM (3) | External pulse-width modulation input | Active-low control: drives oscillator and main switch off when low; internal pull-down allows floating connection if unused. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout input | 1.22V falling threshold with user-programmable hysteresis via resistor divider; <0.4V disables device, reducing quiescent current to <1μA. |
| VIN (5) | Main input supply (3–30V continuous, 40V transient) | Must be bypassed with ≥1μF ceramic capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| SW (6) | Switch node connection | Connects to inductor; trace must be short and wide to minimize EMI and voltage spikes during 2.2MHz switching. |
| ANODE (7) | Internal Schottky anode terminal | Connects to cathode of external LED string in boost mode; ties to inductor in buck/buck-boost configurations. |
| ISP (11) | Current sense positive input | Non-inverting input of internal current-sense amplifier; bias current increases with (VISP − VISN) - route away from SW node. |
| ISN (12) | Current sense negative input | Inverting input of current-sense amplifier; pair with ISP to measure voltage across external sense resistor RSENSE. |
| FB (13) | Voltage feedback input | Regulates to 1.22V; used for CV mode or open-LED detection; never leave floating - tie to GND if unused. |
| CTRL (14) | Current threshold adjustment | Sets VISP−VISN threshold from 100mV to 250mV; tie to VREF (Pin 15) for full-scale 250mV setting. |
| VREF (15) | 2.0V precision reference output | Supplies up to 100μA; used to bias CTRL pin or external circuitry; stable over VIN (3–40V) and temperature. |
| CATHODE (10) | Internal Schottky cathode terminal | Connects to output capacitor in boost mode; ties to LED cathode or ground depending on topology. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio with preserved color fidelity - achieved via VC-node charge retention during PWM low phase, eliminating post-transition current overshoot. |
| Multi-topology support | Native operation in boost, SEPIC, buck-boost, and buck modes - enabled by flexible ISP/ISN sensing and ANODE/CATHODE pin routing, reducing BOM across lighting platforms. |
| Rail-to-rail current sense | 0V to 45V common-mode range - permits direct sensing on either side of LED string without op-amp level shifters or isolated supplies. |
| Integrated protection functions | Open-LED detection (via FB), programmable UVLO hysteresis, and thermal shutdown - reduces external fault-monitoring components in safety-critical automotive systems. |
| Automotive-grade packaging | MSOP-16 with enhanced moisture sensitivity level (MSL-1) and qualified per AEC-Q100 - ensures reliability in humid, high-vibration vehicle environments. |
Applications
| Automotive Daytime Running Lights (DRL) | Instrument Cluster Backlighting |
|---|---|
Use Scenario: Driving LED strings (12–36V, 100–150mA) from 12V battery with cold-cranking tolerance down to 6V and load-dump immunity up to 40V. IC Role / Device Role / Timing Role: Constant-current LED driver with 2.2MHz switching, open-LED reporting, and analog+PWM dimming for adaptive brightness control. Use Value: Eliminates need for external Schottky and current-sense amplifier; achieves >90% efficiency at 12V input while meeting EMI Class 5 limits via high-frequency operation. | Use Scenario: Powering RGB or white LED arrays behind TFT displays, requiring smooth 0–100% dimming without color shift or audible noise. IC Role / Device Role / Timing Role: Dual-loop regulated current source with True Color PWM™ and CTRL-based analog fine-tuning for seamless brightness transitions. Use Value: 3000:1 dimming range preserves LED chromaticity across full intensity scale; internal compensation reduces design cycle time by >3 weeks vs discrete controller solutions. |
| Commercial Vehicle Headlamp Modules | Industrial Control Panel Indicators |
Use Scenario: Driving high-brightness white LEDs (30–40V, 350mA) in sealed headlamp housings where thermal management is constrained. IC Role / Device Role / Timing Role: Boost-mode LED driver with integrated 45V/750mA switch, thermal foldback, and open-LED fault signaling via OPENLED pin. Use Value: Integrated Schottky reduces conduction loss by 150mW vs discrete diode; exposed-pad MSOP package sustains 125°C junction temperature with 2.5W power dissipation. | Use Scenario: Reliable indicator lighting in factory automation panels operating continuously at 24VDC with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Buck-mode constant-current driver with programmable UVLO and rail-to-rail current sensing for flexible LED string configuration. Use Value: Supports 3–30V input range and 0–100% analog dimming via CTRL pin; eliminates need for external voltage regulators or DACs in PLC interface boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EMS#TRPBF | 4-switch synchronous buck-boost controller (no integrated switch/diode); requires external FETs and gate drivers; 200kHz–2MHz programmable frequency. | Higher power (up to 10A), wider VIN (4–36V), but needs 6+ external components vs LT3519IMS-2#TRPBF's 3-component typical BOM. | Select when output power exceeds 5W or bidirectional current flow is required; not drop-in - redesign needed. |
| MAX16832ATP+T | 40V, 1.5A boost LED driver with 500kHz fixed frequency; no integrated Schottky; supports 1000:1 PWM dimming only. | Lower switching frequency demands larger inductors/caps; lacks rail-to-rail current sense and CTRL-based analog dimming. | Choose for cost-sensitive industrial lighting where 2.2MHz operation and 3000:1 dimming are unnecessary. |
Compared with LTC3783EMS#TRPBF and MAX16832ATP+T, the LT3519IMS-2#TRPBF delivers higher integration (switch + Schottky), superior dimming fidelity (3000:1 True Color PWM™), and simpler layout (single-layer MSOP footprint), making it optimal for space- and EMI-constrained automotive LED modules under 5W.
Availability
LT3519IMS-2#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, instrument cluster backlighting, and industrial panel indicators requiring stable component supply, AEC-Q100-compliant operation, and long-term production continuity.
Supply support for LT3519IMS-2#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, documentation, and qualification for all LTC parts including the LT3519 family.
The LT3519 series was designed specifically for high-reliability automotive LED lighting applications demanding wide input range, integrated protection, and flicker-free dimming - addressing thermal, EMI, and functional safety constraints in modern vehicle architectures.
FAQ
What is the maximum recommended output voltage for LT3519IMS-2#TRPBF in boost configuration?
The LT3519IMS-2#TRPBF supports output voltages up to 45V in boost mode, limited by its 45V-rated internal switch and Schottky diode. For reliable operation with 40V transients on VIN, design target VOUT ≤ 38V to maintain 7V margin. The FB resistor divider must be selected so VFB does not exceed 1.16V during normal operation to ensure open-LED detection remains functional. Always verify peak switch voltage in layout using worst-case duty cycle.
Does LT3519IMS-2#TRPBF support buck-mode LED driving, and what are the key layout considerations?
Yes, LT3519IMS-2#TRPBF supports buck-mode operation using ANODE and CATHODE pins as high-side switch and return path, respectively. Key layout requirements include: placing the sense resistor (RSENSE) between ISN and LED cathode (not ground), routing ISP/ISN traces as a matched pair away from SW node, and connecting FB to the LED cathode side for voltage regulation. A PNP transistor (e.g., FMMT555) is typically added between ANODE and VIN to enable high-side switching.
How is the 3000:1 PWM dimming ratio achieved in LT3519IMS-2#TRPBF, and what is the minimum PWM pulse width?
The LT3519IMS-2#TRPBF achieves 3000:1 True Color PWM™ dimming by storing the VC node voltage on the internal compensation capacitor during PWM low periods, enabling near-instantaneous current recovery when PWM goes high. Minimum PWM pulse width is 3μs (six cycles at 2.2MHz). For optimal performance, an external MOSFET must disconnect the LED current path during PWM low to prevent COUT discharge - otherwise dimming linearity degrades above 1000:1.
Can LT3519IMS-2#TRPBF drive multiple parallel LED strings, and how is current matching ensured?
LT3519IMS-2#TRPBF is designed for single-string constant-current operation. Driving multiple parallel strings requires individual current-setting resistors per string and careful thermal management, as mismatched forward voltages cause current imbalance. For multi-string applications, use one LT3519IMS-2#TRPBF per string or select a multi-channel driver like the LT3965. Do not share a single RSENSE across parallel strings - this violates the current-sense architecture and risks overcurrent.
What is the purpose of the CTRL pin in LT3519IMS-2#TRPBF, and how does it interact with the ISP/ISN current sense?
The CTRL pin in LT3519IMS-2#TRPBF sets the threshold voltage across the external sense resistor (RSENSE) between ISP and ISN. At CTRL = 2.0V (VREF), the threshold is fixed at 250mV; at CTRL = 0.1–1.0V, threshold scales linearly from 100mV to 250mV. This allows analog dimming independent of PWM timing. The current-sense amplifier compares (VISP − VISN) to the CTRL-set threshold to regulate LED current - no external op-amp or DAC is needed.
LT3519IMS-2#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:
- 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#TRPBF FAQ
1.How can I place an order for LT3519IMS-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519IMS-2#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-2#TRPBF reliable?
The price and inventory of LT3519IMS-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519IMS-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519IMS-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519IMS-2#TRPBF?
LT3519IMS-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519IMS-2#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-2#TRPBF?
For technical support, including LT3519IMS-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519IMS-2#TRPBF requirements.
6.How does Aetrix verify that LT3519IMS-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519IMS-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519IMS-2#TRPBF?
All LT3519IMS-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519IMS-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3519IMS-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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