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Texas Instruments LM3519MK-20/NOPB
- Part No.:
- LM3519MK-20/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM3519MK-20/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LM3519MK-20/NOPB 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 2.7V–5.5V input, achieves >80% peak efficiency, and supports up to 30kHz PWM dimming via the EN pin.
For engineers reviewing the LM3519MK-20/NOPB datasheet, LM3519MK-20/NOPB pinout, LM3519MK-20/NOPB application, or LM3519MK-20/NOPB equivalent, key selection criteria include its proprietary PFM architecture (2–8MHz switching), true shutdown isolation, over-voltage protection (18–20V), SOT-23-6 package footprint, and compatibility with low-ESR ceramic capacitors and 1–3.3µH inductors.
Technical Context
The LM3519MK-20/NOPB implements a non-pulse-skipping PFM control architecture that forces operation at the edge of continuous conduction mode (CCM), dynamically adjusting on-time to regulate LED current based on feedback from the LED_rtn pin. Its internal 20mA current reference eliminates external programming components.
Switching frequency varies from 2MHz to 8MHz depending on input voltage and inductor value (e.g., 2–5MHz with 2.2µH), enabling compact magnetics and low-output-capacitor designs. The integrated 455mΩ NMOS power switch and 8Ω LED_rtn switch support efficient energy transfer and precise current sensing without external sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current | 20mA (internally trimmed, ±10% tolerance over temperature and VIN) |
| Input Voltage Range | 2.7V to 5.5V (supports single-cell Li-ion and 3.3V/5V rails) |
| Switching Frequency | 2MHz to 8MHz (variable PFM; no external frequency setting required) |
| Efficiency | >80% peak (measured at 4 LEDs, VIN = 3.6V, L = 2.2µH) |
| Over-Voltage Protection | 18–20V threshold (protects output stage during open-circuit or thermal fault) |
| PWM Dimming Range | Up to 30kHz (EN pin accepts logic-level signal; avoids audible noise & visible flicker) |
| Shutdown Isolation | True disconnect (output fully isolated from VIN; <2µA leakage) |
Pinout & Package
LM3519MK-20/NOPB is housed in a 6-pin SOT-23-THIN (DDC) package, 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant matte tin (Sn) finish. Thermal resistance θJA = 220°C/W enables operation from −40°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - En | Enable control input | Logic-level input (0.3V off / 0.9V on); accepts PWM for brightness control |
| 2 - Gnd | Power ground reference | Common return for internal circuitry and external components |
| 3 - VOUT | Boost output node | Connects to anode of LED string and output capacitor; rated to 21V max |
| 4 - LED_rtn | Current-sense feedback | Senses cathode-side current; internal 20mA reference sets LED current |
| 5 - SW | Internal switch drain | Connects to inductor and external Schottky diode anode; 455mΩ RDS(ON) |
| 6 - VIN | Input supply connection | Accepts 2.7–5.5V; requires local 4.7µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary PFM regulation | Enables 2–8MHz variable-frequency operation without pulse skipping, minimizing EMI and inductor size |
| Integrated 20mA current reference | Eliminates external sense resistor and associated layout sensitivity or drift errors |
| True shutdown isolation | Disables power path completely-no leakage through LEDs during standby, critical for battery life |
| Over-voltage protection (OVP) | Clamps output at 18–20V to prevent damage during LED string open-circuit or thermal runaway |
| Low-component-count design | Requires only one inductor (1–3.3µH), two ceramic caps (4.7µF/1µF), and one Schottky diode |
Applications
| Mobile Phone LCD Backlight | Digital Still Camera Display |
|---|---|
Use Scenario: Driving 4-series white LEDs for main display backlight in slim smartphones with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED current via LED_rtn feedback and PFM switching. Use Value: Delivers uniform brightness across LEDs with >80% efficiency at 3.6V input, extending battery runtime. | Use Scenario: Powering high-brightness viewfinder and rear LCD in compact digital cameras with tight board space. IC Role / Device Role / Timing Role: High-frequency (≥4MHz) boost converter enabling use of 2.2µH inductor and 1µF output cap. Use Value: Reduces solution footprint by 40% vs. lower-frequency alternatives while maintaining stable 20mA current accuracy. |
| PDA Main Display Lighting | Handheld Medical Device Indicator |
Use Scenario: Providing flicker-free, dimmable backlight for QVGA–WQVGA displays in legacy PDAs operating from 3.3V rails. IC Role / Device Role / Timing Role: PWM-dimmable LED driver using EN pin with 20–30kHz control signals to avoid audible noise. Use Value: Enables smooth brightness control without mechanical switches or analog dimming losses. | Use Scenario: Driving status LEDs in battery-powered diagnostic tools requiring long operational life and reliable low-power shutdown. IC Role / Device Role / Timing Role: Low-quiescent-current (0.1µA shutdown, 360–500µA active) LED driver with true output isolation. Use Value: Minimizes standby current draw-critical for devices with multi-year battery requirements. |
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 PWM switching; requires external current-sense resistor; 1.8V–5.5V input | Less efficient at light loads due to fixed frequency; higher BOM count | Preferred when predictable EMI profile and external current tuning are required |
| MAX1910EUT+T | PFM architecture with 500kHz–2MHz range; 2.6V–5.5V input; no OVP | Lacks over-voltage protection; lower max output voltage (16V) | Suitable for cost-sensitive designs where OVP is managed externally |
Compared with TPS61160DRVR and MAX1910EUT+T, LM3519MK-20/NOPB offers superior light-load efficiency via variable-frequency PFM, built-in OVP, and zero-resistor current setting-reducing component count and improving reliability in space-constrained portable backlight systems.
Availability
LM3519MK-20/NOPB is available at Aetrix Electronics and suitable for mobile phone backlighting, digital camera displays, PDA lighting, handheld medical indicators, and industrial HMI panels requiring stable component supply and long-lifecycle support.
Supply support for LM3519MK-20/NOPB 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 for industrial, automotive, and personal electronics markets.
The LM3519MK-20/NOPB belongs to TI's white LED backlight driver product line, engineered specifically for high-efficiency, low-footprint boost conversion in battery-powered portable displays with stringent size and power constraints.
FAQ
What is the maximum number of white LEDs the LM3519MK-20/NOPB can drive?
The LM3519MK-20/NOPB is designed to drive up to 4 white LEDs connected in series, each typically requiring ~3.2V forward voltage. At VIN = 3.6V and with a 2.2µH inductor, it sustains regulated 20mA current across the full 4-LED string. Driving fewer LEDs (e.g., 2 or 3) is supported but requires minimum inductance adjustments per the datasheet to maintain current accuracy.
Does the LM3519MK-20/NOPB require an external current-sense resistor?
No, the LM3519MK-20/NOPB does not require an external current-sense resistor. It uses an internal precision 20mA current reference and senses LED current directly at the LED_rtn pin, eliminating component count, layout sensitivity, and temperature drift associated with external resistors. This is confirmed in the "Features" and "Electrical Characteristics" sections of the SNVS394B datasheet.
What is the recommended inductor value for optimal efficiency with the LM3519MK-20/NOPB?
The recommended inductor value for optimal efficiency is 2.2µH (typical), as validated in TI's typical application circuit and efficiency curves. Using 2.2µH yields 2–5MHz switching frequency, >80% peak efficiency at 4 LEDs, and balanced trade-offs between peak current, ripple, and PCB area. 3.3µH improves efficiency marginally but reduces frequency; 1µH increases frequency and losses.
Can the LM3519MK-20/NOPB operate with a 2.5V input supply?
No, the LM3519MK-20/NOPB has a minimum operating input voltage of 2.7V, as specified in the Absolute Maximum and Operating Ratings tables. Operation below 2.7V may result in failure to start, unstable regulation, or undefined behavior. For 2.5V systems, alternative drivers such as the TPS61165 (2.1V min) should be evaluated.
Is the LM3519MK-20/NOPB pin-compatible with other members of the LM3519 family?
Yes, all LM3519 variants-including LM3519MK-20/NOPB, LM3519MK-10/NOPB, and LM3519MK-30/NOPB-are identical in pinout, package (SOT-23-6), and electrical interface. They differ only in factory-trimmed LED current (10mA, 20mA, or 30mA), making them drop-in replacements where current level matches system requirements.
LM3519MK-20/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
LM3519MK-20/NOPB FAQ
1.How can I place an order for LM3519MK-20/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3519MK-20/NOPB 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 LM3519MK-20/NOPB reliable?
The price and inventory of LM3519MK-20/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3519MK-20/NOPB is usually 5 days.
3.What payment methods are accepted for LM3519MK-20/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3519MK-20/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3519MK-20/NOPB?
LM3519MK-20/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3519MK-20/NOPB 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 LM3519MK-20/NOPB?
For technical support, including LM3519MK-20/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3519MK-20/NOPB requirements.
6.How does Aetrix verify that LM3519MK-20/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3519MK-20/NOPB 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 LM3519MK-20/NOPB meets industry standards.
7.What is the process for return or replacement of LM3519MK-20/NOPB?
All LM3519MK-20/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3519MK-20/NOPB, 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 LM3519MK-20/NOPB part is unused and in its original packaging.
Return procedure for LM3519MK-20/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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