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STMicroelectronics STLA02PUR
- Part No.:
- STLA02PUR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
STLA02PUR.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,143
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Product details
Overview
STLA02PUR from STMicroelectronics is a white LED boost driver IC designed for LCD display backlighting in portable electronics. It operates from 2.5 V to 18 V input, delivers up to 27 V output, drives up to 6 series-connected LEDs at 20 mA total current, features 2.3 MHz switching frequency, and supports 300:1 PWM dimming via the EN/PWM pin.
For engineers reviewing the STLA02PUR datasheet, STLA02PUR pinout, STLA02PUR application, or STLA02PUR equivalent, key selection criteria include high-side current sensing architecture, DFN6 (2 × 2 mm) thermal performance, 500 mW output power capability, and integrated 350 mA switch with overvoltage and overtemperature protection.
Technical Context
The STLA02PUR implements current-mode control with an internal error amplifier comparing feedback voltage from a high-side sense resistor (RFB) to a 200 mV reference. Regulation occurs by adjusting duty cycle of the integrated 350 mA N-channel MOSFET switch (RDS(on) = 0.8 Ω), enabling fast transient response to EN/PWM logic transitions.
It integrates dedicated circuitry for PWM dimming directly on the EN pin (100 Hz–1 kHz recommended), overvoltage protection (28 V threshold), thermal shutdown (130–150 °C), and soft-start. The 2.3 MHz fixed-frequency operation minimizes external component size while maintaining efficiency up to 85% at 10 V input and 24 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 18 V - supports single-cell Li-ion to multi-cell alkaline/battery stacks without pre-regulation. |
| Output Voltage Range | Up to 27 V - sufficient to drive six 3.1 V white LEDs in series with margin for sense resistor drop. |
| Max Output Current | 20 mA - precisely regulated via external RFB (10 Ω for 20 mA), enabling stable backlight brightness. |
| Switching Frequency | 2.3 MHz (typ.) - allows use of compact 10 µH shielded inductors and 1 µF ceramic capacitors. |
| Dimming Ratio | 300:1 via EN/PWM - enables fine-grained brightness control in handheld UIs without color shift. |
| Integrated Switch | 350 mA N-MOSFET (RDS(on) = 0.8 Ω) - eliminates external switch, reduces BOM count and PCB area. |
| Protection Features | OVP (28 V), thermal shutdown (130–150 °C), soft-start - ensures robust operation during load transients and fault conditions. |
Pinout & Package
STLA02PUR is housed in a thermally enhanced DFN6 package (2 mm × 2 mm, 0.75 mm height) with exposed pad for improved heat dissipation. The package complies with ECOPACK® environmental standards and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power input | Accepts 2.5–18 V supply; requires local 1 µF ceramic decoupling capacitor. |
| 2 GND | Ground reference | Primary ground return; connects to exposed pad for thermal and electrical integrity. |
| 3 LX | Switch node | Drives external inductor; high dv/dt node requiring short, low-inductance routing. |
| 4 VOUT | Boost output | Delivers regulated high-voltage output to LED anodes; connects to cathode of last LED in string. |
| 5 FB | Feedback input | High-side current sense input; monitors voltage across RFB (VFB = 200 mV typ.) to regulate ILED. |
| 6 EN/PWM | Enable & dimming control | Logic-level enable (VIL ≤ 1.5 V, VIH ≥ 1.8 V); accepts 100 Hz–1 kHz PWM for direct current dimming. |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Eliminates need for low-side shunt, simplifying LED string layout and avoiding ground loop interference. |
| 2.3 MHz fixed-frequency operation | Enables use of miniature 10 µH inductors and 0805/0603 MLCCs, reducing solution footprint by >40% vs. 500 kHz designs. |
| Integrated 350 mA switch | Reduces external component count by one MOSFET and associated gate drive circuitry, lowering BOM cost and layout complexity. |
| 300:1 PWM dimming range | Supports smooth, flicker-free brightness control down to 0.3% intensity-critical for user interface backlighting. |
| Overvoltage & thermal protection | Prevents damage during open-circuit LED failure or ambient temperature rise beyond 85 °C operating limit. |
Applications
| Smartphone Backlight | PDA Display Lighting |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs in series for main LCD backlight in sub-6-inch smartphones with battery input ranging from 3.0 V (discharged) to 4.4 V (fully charged). IC Role / Device Role / Timing Role: Boost converter and constant-current regulator; provides stable 20 mA LED current independent of input voltage variation and LED forward voltage drift. Use Value: Maintains consistent display luminance across battery discharge cycle while enabling dynamic brightness scaling via EN/PWM with no color shift. |
Use Scenario: Powering QVGA or VGA resolution TFT-LCD backlights in industrial PDAs used in warehouse scanning and field service applications. IC Role / Device Role / Timing Role: High-efficiency LED driver with thermal shutdown; regulates current under extended operation at elevated ambient temperatures (up to 85 °C). Use Value: Ensures reliable backlight operation in hot environments without derating, thanks to 150 °C junction shutdown and DFN6 thermal pad design. |
| MP3 Player UI Illumination | Portable Medical Display |
|
Use Scenario: Illuminating OLED or segment LCD user interface in battery-powered MP3 players with 2×AA/AAA alkaline supply (2.4–3.2 V nominal). IC Role / Device Role / Timing Role: Wide-input boost controller; steps up low battery voltage to drive 3–4 series LEDs at 20 mA with minimal quiescent current (10 µA in shutdown). Use Value: Extends playback time by minimizing no-load power loss and supporting deep-sleep modes via EN pin control. |
Use Scenario: Backlighting small diagnostic displays in portable ultrasound or glucose monitor devices requiring precise, stable light output. IC Role / Device Role / Timing Role: Precision current source with ±5% output tolerance; maintains calibrated display brightness across temperature (-40 to +85 °C) and supply variation. Use Value: Enables clinical-grade visual consistency without recalibration, supported by tight VFB (190–210 mV) and low ΔIO drift. |
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 |
|---|---|---|---|
| MAX1910EUT+T | Fixed 1.2 MHz switching frequency; requires external MOSFET; no integrated OVP or thermal shutdown. | Lacks monolithic protection features; demands additional discrete components for fault handling. | Choose when board space permits external FET layout and system-level protection is already implemented elsewhere. |
| TPS61160DRVR | 2.2 MHz switching; integrated 400 mA switch; supports analog + PWM dimming; no high-side sensing. | Uses low-side current sensing, requiring LED cathode grounding-less flexible for common-anode displays. | Prefer when dual dimming modes are needed and LED configuration allows cathode-referenced topology. |
Compared with MAX1910EUT+T and TPS61160DRVR, STLA02PUR uniquely combines high-side sensing, monolithic protection, and DFN6 thermal performance-making it optimal for space-constrained, safety-critical portable backlight designs where layout simplicity and fault resilience are prioritized.
Availability
STLA02PUR is available at Aetrix Electronics and suitable for smartphone backlighting, PDA display lighting, MP3 player UI illumination, and portable medical display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STLA02PUR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
STLA02PUR belongs to ST's LED driver product line, engineered specifically for efficient, compact, and robust backlight solutions in battery-powered portable displays-emphasizing integration, thermal resilience, and ease of PCB layout.
FAQ
What is the recommended RFB value for 20 mA LED current?
The STLA02PUR regulates output current using the feedback voltage (VFB = 200 mV typical) across RFB. For 20 mA, RFB = VFB/ILED = 0.2 V / 0.02 A = 10 Ω. A 0402 10 Ω, 1/16 W resistor is specified in the datasheet and validated in the typical application schematic.
Can STLA02PUR drive more than six white LEDs?
No-STLA02PUR is rated for up to six series-connected white LEDs at 20 mA, corresponding to a maximum output voltage of 27 V. Exceeding this limit risks violating the absolute maximum rating for VOUT (30 V) and may trigger overvoltage protection or cause regulation failure due to insufficient headroom.
Is the EN/PWM pin compatible with 1.8 V logic levels?
Yes-the EN/PWM pin has a guaranteed VIH threshold of ≥1.8 V at VIN = 2.5–18 V, making it compatible with standard 1.8 V GPIO outputs. The datasheet explicitly recommends ≥1.8 V for reliable high-level detection and specifies 300 Hz PWM dimming validation at this level.
Does STLA02PUR require an external Schottky diode?
No-STLA02PUR integrates a synchronous rectifier architecture with an internal N-channel MOSFET switch and does not use a flyback diode. The LX pin connects directly to the inductor, and energy transfer relies on controlled MOSFET switching and output capacitor storage, eliminating diode conduction losses.
STLA02PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- 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):
- 2.5V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- 27V
- Current - Output / Channel:
- 20mA
- Frequency:
- 2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
STLA02PUR FAQ
1.How can I place an order for STLA02PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for STLA02PUR 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 STLA02PUR reliable?
The price and inventory of STLA02PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLA02PUR is usually 5 days.
3.What payment methods are accepted for STLA02PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLA02PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STLA02PUR?
STLA02PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STLA02PUR 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 STLA02PUR?
For technical support, including STLA02PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLA02PUR requirements.
6.How does Aetrix verify that STLA02PUR is sourced from the original manufacturer or authorized distributors?
All STLA02PUR 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 STLA02PUR meets industry standards.
7.What is the process for return or replacement of STLA02PUR?
All STLA02PUR units undergo pre-shipment inspection (PSI). If there is an issue with STLA02PUR, 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 STLA02PUR part is unused and in its original packaging.
Return procedure for STLA02PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STLA02PUR Tags
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BCR430UXTSA2
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BCR420UE6433HTMA1
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CL2N8-G
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