YX8018 DC-DC Boost Converter for Solar Garden Light LED Driver IC TO-94

YX8018 DC-DC Boost Converter for Solar Garden Light LED Driver IC TO-94 is a specialized, low-cost switching regulator designed specifically to drive LEDs in solar-powered garden and pathway lighting applications. This highly efficient boost converter operates directly from a single AA or AAA Ni-MH/Ni-Cd rechargeable battery, generating the necessary high voltage to power white, blue, or green LEDs. Consequently, the YX8018 enables reliable, long-duration illumination from a very low voltage source. The device features integrated control and switching components, requiring minimal external parts (typically just an inductor and a capacitor). Furthermore, its unique design includes a built-in light-control function, automatically turning the LED off when ambient light is detected by the solar panel and turning it back on in darkness, making it the ideal single-chip solution for autonomous solar lighting.

Key Features:

• Ultra-Low Voltage Start-up: The IC initiates operation from an input voltage as low as 0.9 V, therefore maximizing the usable discharge time of a single rechargeable battery cell.
• Integrated Light Control: Features an ambient light sensing input (connected to the solar panel) which provides automatic day/night switching functionality.
• High Efficiency Boost: Operates as a DC-DC boost converter, efficiently stepping up the low battery voltage (1.2 V nominal) to the required LED forward voltage (typically 3.0 V to 3.4 V).
• Minimal External Components: Requires only one external inductor and one capacitor, significantly simplifying circuit design and reducing overall BOM cost.
• Current Limiting Output: The internal structure limits the output current, which protects the LED from overcurrent damage and ensures consistent brightness.

Technical Specifications:

• Minimum Operating Voltage: ≈ 0.9 V
• Typical Input Voltage: 1.2 V (Single Ni-MH/Ni-Cd cell)
• LED Output Current: ≈ 3 mA to 30 mA (Adjustable via inductor choice and input voltage)
• Quiescent Current (Night Mode): ≈ 10 μA (Extremely low standby power consumption)
• Control Method: Hysteretic PFM (Pulse Frequency Modulation) switching mode.
• Maximum Switching Frequency: ≈ 150 kHz
• Package: TO-94 (SOT-23 derivative)

Mechanical Specifications:

• Component Material: Silicon integrated circuit
• Package Style: TO-94 (Small outline, 3-pin configuration)
• Mounting: Surface Mount Technology (SMT)
• Thermal Resistance: Designed for low-power operation, minimizing heat dissipation requirements.

Dimensions:

• Body Length: ≈ 2.9 mm
• Body Width: ≈ 1.3 mm
• Body Height: ≈ 1.0 mm
• Pin Pitch: ≈ 0.95 mm (Standard for SOT-23 packages)
• Footprint: Compact design for integration into small lighting fixtures.

Pinout and Wiring:

• Pin 1 (GND): Connect to the negative terminal of the battery and the LED cathode.
• Pin 2 (LX – Switching Pin): Connect to one side of the external inductor. The other side of the inductor connects to the battery positive (V_IN).
• Pin 3 (V_CC/SW – Battery & Light Control): Connect to the positive terminal of the battery and the positive output of the small solar panel (daytime charging source). This pin serves as both power input and the light/dark sensing input.
• Wiring Note: Connect the LED anode to the LX pin via a Schottky diode (often built into the module or assumed), completing the boost circuit. The solar panel voltage on Pin 3 determines the automatic switching.

Datasheet Reference:

• Download YX8018 Solar Garden Light IC Datasheet

Commonly Used in:

• Solar Garden Lamps: The primary application for outdoor pathway, lawn, and decorative lights powered by small solar cells.
• Emergency Lanterns: Used in small, battery-operated LED flashlights and lanterns requiring minimal components.
• Novelty Solar Products: Any low-power consumer electronics that rely on a single rechargeable battery and automatic light detection.

Applications:

• Night Illumination: Providing reliable and autonomous light activation when ambient light levels fall below a preset threshold.
• Battery Optimization: Maximizing the discharge time of a single Ni-MH/Ni-Cd cell by starting up at very low terminal voltages.
• Low-Cost LED Driving: Offering a simple, efficient, and extremely economical solution for driving 1-4 LEDs in series or parallel from a single cell.

Equivalent Models:

• QX5252F / QX5252: Highly popular functional equivalents used widely in solar lamp circuits, however, they might have slightly different start-up voltage or current limiting characteristics.
• SMD-LED-DRIVER-IC (Generic): Many manufacturers produce similar low-cost, boost-only LED drivers that directly compete with the YX8018.
• CL0117: Another solar LED driver IC offering integrated light control and boost functionality, suitable as a replacement in many circuits.

Package Includes:

• 1 x YX8018 DC-DC Boost Converter for Solar Garden Light LED Driver IC TO-94