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Texas Instruments LM3519MKX-20
- Part No.:
- LM3519MKX-20
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM3519MKX-20.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,399
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Product details
Overview
LM3519MKX-20 from Texas Instruments is a high-frequency boost white LED driver IC optimized for LCD backlighting in portable electronics. It delivers constant 20mA current to 2–4 series-connected white LEDs, operates with 2–8MHz PFM switching, supports up to 30kHz PWM dimming, and features true shutdown isolation and over-voltage protection up to 20V. It targets space-constrained mobile phone displays requiring efficient, flicker-free brightness control.
For engineers reviewing the LM3519MKX-20 datasheet, LM3519MKX-20 pinout, LM3519MKX-20 application, or LM3519MKX-20 equivalent, key selection considerations include its 6-pin SOT-23-THIN package, 2.7–5.5V input range, internal 20mA LED current setting, >80% peak efficiency at 4LEDs, and compatibility with low-profile 1–3.3µH inductors and 1µF ceramic output capacitors.
Technical Context
The LM3519MKX-20 implements a proprietary non-pulse-skipping PFM architecture that forces operation at the edge of continuous conduction mode (CCM), dynamically adjusting on-time to regulate LED current via the LED_rtn feedback node. Its internal power NMOS switch (RDS(ON) = 455mΩ) and dedicated LED current-sense path enable precise 20mA regulation across input voltage and temperature variations.
Switching frequency scales inversely with inductor value-ranging from 4–8MHz with 1µH, 2–5MHz with 2.2µH, and 2–4MHz with 3.3µH-enabling compact magnetics while maintaining >80% peak efficiency. The EN pin accepts logic-level PWM signals (0.3V/0.9V thresholds) for high-speed brightness control without analog current scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current | 20mA (internally trimmed, ±5.5% tolerance over temp/voltage) |
| Input Voltage Range | 2.7V to 5.5V (supports single-cell Li-ion and 3.3V/5V rails) |
| Switching Frequency | 2MHz to 8MHz (inductor-dependent; enables <1mm height magnetics) |
| Peak Efficiency | >80% (at 4 LEDs, VIN=3.6V, L=2.2µH, COUT=1µF) |
| OVP Threshold | 18.6V (typical turn-off), 18.9V (typical turn-on); protects LED string from overvoltage |
| Shutdown Isolation | True output disconnect (ILEAKAGE ≤2µA); eliminates LED leakage current path to GND |
| Enable Threshold | 0.9V (turn-on), 0.3V (turn-off); compatible with standard GPIO logic levels |
Pinout & Package
LM3519MKX-20 is housed in a 6-pin SOT-23-THIN (DDC) package, 3.05mm × 1.75mm × 1.1mm, with exposed pad not electrically connected. Pin 1 is marked by an index area; tape-and-reel orientation follows quadrant Q3 per JEDEC MO-193.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - En | Logic Enable Input | Active-high digital control: 0.3V/0.9V thresholds enable direct MCU GPIO drive for PWM dimming |
| 2 - Gnd | Power Ground Reference | Common return for internal circuitry and external components; requires low-impedance PCB connection |
| 3 - VOUT | Boost Output Node | High-impedance output connecting to LED anodes; integrates OVP sensing and must be decoupled with ≥1µF ceramic cap |
| 4 - LED_rtn | LED Current Sense Input | Senses voltage drop across internal sense FET (RLED_rtn(ON) = 8Ω); sets regulated 20mA LED current |
| 5 - SW | Internal Power Switch Drain | Connects to inductor and external Schottky diode cathode; handles peak currents up to 750mA |
| 6 - VIN | Input Supply Voltage | Accepts 2.7–5.5V; requires local 4.7µF ceramic decoupling placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed PWM Dimming | Supports 17–30kHz EN-pin modulation for flicker-free, audible-noise-free brightness control in handheld displays |
| Proprietary PFM Architecture | Non-pulse-skipping variable-frequency operation maintains regulation accuracy and minimizes EMI vs fixed-frequency alternatives |
| Integrated Protection | Over-voltage protection (18.6–20V window) and thermal shutdown prevent damage during open-circuit or overtemp conditions |
| Small External Components | Optimized for 1–3.3µH inductors and 1µF output capacitor-reduces BOM count and board area vs legacy boost drivers |
| True Shutdown Mode | Output fully disconnected from input (≤2µA leakage); eliminates standby current through LED string |
Applications
| Mobile Phone LCD Backlighting | Digital Still Camera Display |
|---|---|
|
Use Scenario: Driving 4-series white LEDs in a slim smartphone front bezel under battery-powered operation. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current at 20mA with dynamic input voltage compensation. Use Value: Enables uniform brightness across display while sustaining >80% efficiency at 3.6V input and minimizing heat generation in thermally constrained enclosures. |
Use Scenario: Providing adjustable backlight for a 2.7-inch OLED viewfinder in a compact DSC with limited PCB real estate. IC Role / Device Role / Timing Role: High-frequency (≥4MHz) LED driver accepting 20kHz PWM from image processor for seamless brightness transitions. Use Value: Eliminates visible flicker and audible coil whine using 2.2µH inductor and 1µF ceramic output cap-critical for user-facing imaging interfaces. |
| PDA Keypad Illumination | Portable Medical Device Indicator |
|
Use Scenario: Powering dual-white-LED keypad backlight in legacy PDA with 3.3V rail and intermittent usage pattern. IC Role / Device Role / Timing Role: Low-quiescent-current (360µA non-switching) boost driver with true shutdown isolating LEDs during sleep mode. Use Value: Extends battery life by cutting off all LED leakage paths-achieving <0.1µA system standby current when EN = 0V. |
Use Scenario: Delivering reliable, stable illumination for status LEDs in FDA-classified handheld diagnostic tools operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-compensated LED current regulator maintaining ±10% ILED accuracy across full industrial junction range (-40°C to +125°C). Use Value: Ensures consistent visual indication intensity regardless of ambient temperature-validated per Electrical Characteristics table limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61160DRVR | Fixed 1.2MHz switching frequency; requires external current-setting resistor; no integrated OVP | Less suited for ultra-compact layouts due to larger inductor requirements; lacks built-in overvoltage protection | Prefer when fixed-frequency EMI control is required and external OVP can be added |
| MAX1910EUT+T | 2.5MHz fixed frequency; 1.25A switch current limit; no PFM mode; higher quiescent current (600µA) | Higher peak current supports longer LED strings but sacrifices efficiency below 3.3V input | Choose when driving >4 LEDs or needing higher fault-current headroom at cost of efficiency |
Compared with LM3519MKX-20, TPS61160DRVR offers predictable EMI but requires more board area and external protection, while MAX1910EUT+T provides higher drive capability at reduced light-output stability and efficiency across input voltage range.
Availability
LM3519MKX-20 is available at Aetrix Electronics and suitable for mobile phone backlighting, digital still camera displays, and portable medical device indicators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3519MKX-20 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on power management innovation and automotive-grade reliability.
The LM3519 product line was designed specifically for high-efficiency, space-constrained white LED backlighting in battery-powered portable devices-prioritizing small footprint, low EMI, and robust thermal performance.
FAQ
What is the maximum number of white LEDs the LM3519MKX-20 can drive?
The LM3519MKX-20 is specified to drive up to 4 white LEDs in series at 20mA each. Driving fewer LEDs (e.g., 2 or 3) is supported but requires minimum inductance adjustments-2.2µH for 2 LEDs-to maintain current accuracy and loop stability per TI's Application Information section.
Does the LM3519MKX-20 require an external current-setting resistor?
No, the LM3519MKX-20 uses an internal trimmed reference to set LED current at 20mA (±5.5% typical tolerance). No external resistor is needed-current regulation is achieved solely through the LED_rtn feedback path and internal sense FET.
What is the recommended PWM frequency range for brightness control on the LM3519MKX-20 EN pin?
Texas Instruments specifies 17kHz to 30kHz as the optimal PWM frequency range for the LM3519MKX-20 EN pin. Frequencies below 17kHz risk audible noise and visible flicker; above 30kHz, current linearity vs. duty cycle degrades per the datasheet's PWM DIMMING section.
Can the LM3519MKX-20 operate from a 2.5V input supply?
No-the LM3519MKX-20 has a minimum operating input voltage of 2.7V per its Absolute Maximum Ratings and Operating Ratings tables. Operation below 2.7V is not guaranteed and may result in failure to start or unstable regulation.
What package variant does LM3519MKX-20 correspond to?
The LM3519MKX-20 is the tape-and-reel version of the LM3519MK-20/NOPB, packaged in a 6-pin SOT-23-THIN (DDC) outline with 3.05mm × 1.75mm footprint and 1.1mm max height-confirmed in TI's PACKAGE OPTION ADDENDUM and PACKAGE OUTLINE documentation.
LM3519MKX-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 20V
- Current - Output / Channel:
- 20mA
- Frequency:
- 5.4MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM3519MKX-20 FAQ
1.How can I place an order for LM3519MKX-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3519MKX-20 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 LM3519MKX-20 reliable?
The price and inventory of LM3519MKX-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3519MKX-20 is usually 5 days.
3.What payment methods are accepted for LM3519MKX-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3519MKX-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3519MKX-20?
LM3519MKX-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3519MKX-20 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 LM3519MKX-20?
For technical support, including LM3519MKX-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3519MKX-20 requirements.
6.How does Aetrix verify that LM3519MKX-20 is sourced from the original manufacturer or authorized distributors?
All LM3519MKX-20 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 LM3519MKX-20 meets industry standards.
7.What is the process for return or replacement of LM3519MKX-20?
All LM3519MKX-20 units undergo pre-shipment inspection (PSI). If there is an issue with LM3519MKX-20, 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 LM3519MKX-20 part is unused and in its original packaging.
Return procedure for LM3519MKX-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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