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Analog Devices Inc. LT3519EMS-2#TRPBF
- Part No.:
- LT3519EMS-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT3519EMS-2#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
LT3519EMS-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 sense (0–45V), programmable UVLO, open-LED fault detection, and delivers up to 3000:1 True Color PWM™ dimming for automotive LED lighting systems.
For engineers reviewing the LT3519EMS-2#TRPBF datasheet, LT3519EMS-2#TRPBF pinout, LT3519EMS-2#TRPBF application, or LT3519EMS-2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed switching topology support (boost/SEPIC/buck-boost/buck), real-world dimming performance data, and manufacturer-validated alternative options for LED driver design.
Technical Context
The LT3519EMS-2#TRPBF employs current-mode control with internal compensation and dual-loop feedback-voltage loop via FB pin (1.22V reference) and rail-to-rail current sense via ISP/ISN pins. Its 2.2MHz switching frequency enables compact magnetics and low-output-ripple designs suitable for space-constrained automotive modules.
It integrates a 45V/750mA N-channel MOSFET switch and Schottky diode, supports analog dimming via CTRL pin (0.1–2.0V input, 250mV full-scale threshold), and features an open-collector OPENLED status pin that asserts when FB exceeds VFB − 60mV-enabling reliable open-string fault reporting without external comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.2MHz - enables use of sub-10μH inductors and <3μF ceramic output capacitors, reducing board area and EMI filter size. |
| Input Voltage Range | 3V to 30V continuous, 40V transient - supports 12V/24V automotive battery rails with cold-crank and load-dump tolerance. |
| Switch Rating | 45V VDS, 750mA ISW - drives LED strings up to ~38V forward voltage in boost mode with margin for ripple and transients. |
| Current Sense Range | Rail-to-rail 0V–45V across ISP/ISN - allows direct sensing on high-side or low-side current paths, including buck and buck-boost topologies. |
| PWM Dimming Ratio | Up to 3000:1 - achieved with external MOSFET disconnect and ≥6-switch-cycle minimum pulse width, preserving color fidelity. |
| CTRL Pin Threshold | 250mV full-scale (at VCTRL ≥ 1.2V) - sets LED current as ILED = 250mV / RSENSE; linearly adjustable down to 100mV for fine analog dimming control. |
| Open LED Detection | FB threshold offset of −60mV (typical) - triggers OPENLED pin pull-down when string opens, enabling system-level fault logging without software polling. |
Pinout & Package
LT3519EMS-2#TRPBF is housed in a thermally enhanced 16-lead MSOP package (3mm × 4.9mm, 0.5mm pitch) with four GND pins (1, 8, 9, 16) for low-impedance grounding and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 8, 9, 16) | Power and signal ground | Four dedicated ground connections minimize ground bounce and improve thermal resistance (θJA = 130°C/W). |
| OPENLED (2) | Open LED status output | Open-drain output pulled low when FB > VFB − 60mV; requires external pull-up for logic-level reporting. |
| PWM (3) | Pulse-width modulation enable | Active-low control: disables oscillator and saves VC node charge state during off-time for fast recovery and minimal current overshoot. |
| SHDN/UVLO (4) | Shutdown and undervoltage lockout | 1.22V falling threshold with user-programmable hysteresis via resistor divider; sub-μA shutdown current (<1μA typical). |
| VIN (5) | Main input supply | Accepts 3–30V; requires local 1μF ceramic bypass capacitor placed adjacent to pin for stable operation under pulsed load. |
| SW (6) | Switch node | Connects to inductor; high dv/dt node requiring minimized trace length and area to reduce EMI radiation. |
| ANODE (7) | Integrated Schottky anode | Internal connection to Schottky diode anode; used in boost/SEPIC configurations to eliminate external diode. |
| 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 with 250mV full-scale range. |
| FB (13) | Voltage feedback input | Regulates to 1.22V; used for CV mode or open-LED protection; must not be left floating-tie to GND if unused. |
| CTRL (14) | Current threshold adjustment | Sets VISP−VISN threshold from 100mV to 250mV; connect to VREF (2.0V) for full-scale operation. |
| VREF (15) | 2.0V reference output | Stable 2.0V ±2% output capable of sourcing 100μA; used to bias CTRL, PWM, or external circuitry. |
| CATHODE (10) | Integrated Schottky cathode | Internal connection to Schottky diode cathode; ties to output in boost mode or to LED string cathode in buck configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 45V/750mA switch + Schottky diode | Reduces BOM count by two components and eliminates layout sensitivity of external diode placement in high-frequency boost designs. |
| Rail-to-rail 0–45V current sense range | Enables flexible PCB layout-current sense resistor can be placed on either side of LED string without level-shifting circuitry. |
| True Color PWM™ dimming (up to 3000:1) | Maintains consistent LED chromaticity across dimming range by eliminating low-frequency current modulation artifacts. |
| Programmable UVLO with hysteresis | Allows precise start-up and shut-down thresholds (e.g., 6.2V fall / 8.2V rise) using two external resistors and internal 2.2μA pull-down current. |
| Open-LED fault detection with latch behavior | OPENLED pin retains last valid fault state during PWM idle periods, enabling robust diagnostics in intermittent-fault scenarios. |
| Internal compensation network | Eliminates need for external compensation components-reduces design iteration time and improves production consistency. |
Applications
| Automotive Headlamp Driver | Industrial Status Lighting |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays (e.g., 38V, 100mA) in 12V vehicle electrical systems with cold-crank immunity. IC Role / Device Role / Timing Role: Constant-current LED driver operating in boost topology with 2.2MHz switching to minimize EMI and meet CISPR-25 Class 5 requirements. Use Value: Integrated Schottky and 45V switch eliminate external diode and enable single-chip solution for headlamp DRL and position light functions. |
Use Scenario: Powering multi-color indicator LEDs on factory HMIs where precise brightness control and long-term reliability are critical. IC Role / Device Role / Timing Role: Constant-current source with analog dimming (via CTRL) and PWM dimming (via PWM pin) for smooth, flicker-free intensity transitions. Use Value: Rail-to-rail current sense allows direct low-side sensing on shared ground planes, simplifying PCB routing and reducing noise coupling. |
| Buck-Boost Backlight Driver | Commercial Signage LED Module |
|
Use Scenario: Driving 16V, 150mA LED strings from variable 6–24V industrial power supplies with wide input tolerance. IC Role / Device Role / Timing Role: Buck-boost topology controller using ANODE/CATHODE pins to configure bidirectional energy transfer and maintain regulation across input range. Use Value: Single IC replaces discrete buck+boost solutions; OPENLED pin provides fail-safe open-string detection for maintenance alerts. |
Use Scenario: High-reliability outdoor signage requiring >50,000-hour lifetime, thermal derating, and overvoltage protection against lightning-induced surges. IC Role / Device Role / Timing Role: Constant-current regulator with programmable UVLO and 40V transient rating protecting downstream LED arrays from brownouts and surges. Use Value: Internal 750mA switch and thermal design (125°C max junction) support continuous operation at full load in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3518EMS-2#TRPBF | Same 2.2MHz frequency and pinout, but lacks integrated Schottky diode and open-LED status pin. | Requires external Schottky and fault-monitoring circuitry; suitable only where board space permits added components. | Select when lower quiescent current (2.5μA vs 3.5μA) and absence of integrated diode simplify thermal management in high-ambient environments. |
| LM3409QMH/NOPB | 40V/1.25A external-switch controller (no integrated FET); 1MHz max frequency; no integrated Schottky or OPENLED pin. | Requires external high-side N-MOSFET, gate driver, and Schottky; supports higher current but adds complexity and component count. | Select when >750mA LED current or custom switch selection (e.g., SiC FET) is required, and system-level fault reporting is handled externally. |
Compared with LT3519EMS-2#TRPBF, LT3518EMS-2#TRPBF trades integration for slightly lower IQ and thermal flexibility, while LM3409QMH/NOPB offers scalability at the cost of BOM expansion and design effort-making LT3519EMS-2#TRPBF optimal for compact, high-integration automotive and industrial LED drivers.
Availability
LT3519EMS-2#TRPBF is available at Aetrix Electronics and suitable for automotive headlamp systems, industrial HMI status lighting, and commercial LED signage requiring stable component supply, AEC-Q100-compliant performance, and long-lifecycle availability.
Supply support for LT3519EMS-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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3519 family was designed specifically for high-efficiency, high-reliability LED lighting in harsh environments-emphasizing integrated protection (open-LED, UVLO, thermal foldback), wide input range, and precision dimming for automotive and industrial applications.
FAQ
What is the maximum switching frequency of the LT3519EMS-2#TRPBF?
The LT3519EMS-2#TRPBF operates at a fixed 2.2MHz switching frequency, as confirmed in the Electrical Characteristics table (TYP value 2.2MHz, MAX 2.4MHz). This frequency enables compact passive component selection and reduced EMI filter requirements compared to lower-frequency alternatives like the LT3519 (400kHz) or LT3519-1 (1MHz). The LT3519EMS-2#TRPBF maintains this frequency across its full −40°C to 125°C operating junction temperature range.
Does the LT3519EMS-2#TRPBF include an integrated Schottky diode?
Yes, the LT3519EMS-2#TRPBF integrates a Schottky diode with 0.8V forward drop at 500mA and 4μA leakage at 24V reverse bias, as specified in the Electrical Characteristics table. Its anode and cathode are exposed on pins ANODE (7) and CATHODE (10), eliminating the need for an external diode in boost, SEPIC, and buck-boost configurations-reducing BOM count and PCB area.
How does open-LED detection work on the LT3519EMS-2#TRPBF?
The LT3519EMS-2#TRPBF uses its FB pin to detect open-LED conditions: when FB voltage rises to within ~60mV of its 1.22V regulation threshold (i.e., >1.16V), the OPENLED pin pulls low. This latched behavior persists during PWM idle periods, providing reliable fault reporting without continuous polling. An external pull-up resistor is required on OPENLED to generate a logic-high signal when no fault is present.
Can the LT3519EMS-2#TRPBF operate in buck topology?
Yes, the LT3519EMS-2#TRPBF supports buck topology operation, as explicitly stated in the FEATURES section ("Boost, SEPIC, Buck-Boost Mode or Buck Mode Topology") and demonstrated in Typical Application TA04a. In buck mode, the ANODE pin connects to the input rail, CATHODE to the LED string cathode, and ISP/ISN sense current on the low-side-leveraging the rail-to-rail current sense capability for accurate regulation.
What is the purpose of the CTRL pin on the LT3519EMS-2#TRPBF?
The CTRL pin on the LT3519EMS-2#TRPBF adjusts the current sense threshold between ISP and ISN-from 100mV to 250mV-enabling analog dimming. At VCTRL ≥ 1.2V, it sets full-scale 250mV threshold (ILED = 250mV/RSENSE). Between 0.1V and 1.0V, it linearly scales the threshold, allowing precise analog brightness control without PWM artifacts. The pin must not be left floating; tie to VREF if unused.
LT3519EMS-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
LT3519EMS-2#TRPBF FAQ
1.How can I place an order for LT3519EMS-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3519EMS-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 LT3519EMS-2#TRPBF reliable?
The price and inventory of LT3519EMS-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 LT3519EMS-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3519EMS-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3519EMS-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3519EMS-2#TRPBF?
LT3519EMS-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3519EMS-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 LT3519EMS-2#TRPBF?
For technical support, including LT3519EMS-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3519EMS-2#TRPBF requirements.
6.How does Aetrix verify that LT3519EMS-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3519EMS-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 LT3519EMS-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3519EMS-2#TRPBF?
All LT3519EMS-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3519EMS-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 LT3519EMS-2#TRPBF part is unused and in its original packaging.
Return procedure for LT3519EMS-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3519EMS-2#TRPBF Tags
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