3V-4.2V Li-ion Battery to 1.5V AA/AAA Dry Cell Converter

3V-4.2V Li-ion Battery to 1.5V AA/AAA Dry Cell Converter step-down module converts standard single-cell Lithium-ion battery voltages into a regulated 1.5 V DC output to replace traditional AA or AAA dry cell batteries. This efficient buck converter module accepts a 3.0 V to 4.2 V DC input from 18650, 14500, or Li-Po batteries, converting the power efficiently to drive 1.5 V household electronics. Consequently, it eliminates the recurring cost and environmental waste associated with disposable alkaline batteries. Furthermore, its compact footprint fits seamlessly into custom battery compartments or DIY power supply enclosures. Therefore, you can easily modernize legacy battery-operated equipment with rechargeable lithium power solutions.

Key Features:

• High-Efficiency Conversion: Utilizes synchronous step-down regulation to deliver stable output voltage with minimal thermal loss.
• Stable 1.5V Output: Maintains a constant 1.5 V DC supply throughout the entire Lithium-ion discharge cycle from 4.2 V down to 3.0 V.
• Compact Form Factor: Features a tiny PCB footprint designed for easy integration into portable electronic devices and battery shells.
• Cost-Effective Power: Replaces disposable 1.5 V AA/AAA dry cells with rechargeable Li-ion technology to lower long-term operating costs.
• Low Quiescent Current: Draws minimal standby power, preserving total battery runtime during non-operational periods.

Technical Specifications:

• Input Voltage Range: 3.0 V DC to 4.2 V DC
• Output Voltage: 1.5 V DC ±2%
• Maximum Output Current: ≈ 1.5 A to 2.0 A
• Conversion Efficiency: ≥ 90% under typical load conditions
• Switching Frequency: ≈ 1.5 MHz
• Operating Temperature: -20°C to +85°C

Mechanical Specifications:

• PCB Material: Standard FR-4 Glass-Reinforced Epoxy Composite
• Mounting Style: Surface-mount pads for direct wire soldering or spring contact connection
• Board Finish: Lead-free solder pads with protective solder mask

Dimensions:

• Length: ≈ 15.0 mm
• Width: ≈ 10.0 mm
• Height: ≈ 3.0 mm
• Weight: ≈ 1.0 g

Pinout and Wiring:

• IN+: Positive Input Terminal (Connect to positive terminal of 3.7V Li-ion battery).
• IN-: Negative Input / Ground Terminal (Connect to negative terminal of Li-ion battery).
• OUT+: Regulated 1.5V Positive Output Terminal (Connect to device positive terminal).
• OUT-: Common Ground Output Terminal (Connect to device negative terminal).
• Wiring Note: However, strictly verify input polarity before applying power, as reverse voltage connection may damage the step-down regulator.

Datasheet Reference:

• Download Datasheet Reference

Commonly Used in:

• Battery Dummy Adapters: Converting standard AA/AAA dry cell battery slots to lithium-ion rechargeable power sources.
• Wireless Peripherals: Powering wireless computer mice, keyboards, and remote controls with single-cell Li-Po batteries.
• Clocks and Toys: Upgrading wall clocks, handheld electronic toys, and flashlights to rechargeable operation.

Applications:

• DIY Hardware Upgrades: Retrofitting legacy handheld gaming devices and radios with rechargeable internal batteries.
• IoT Microcontrollers: Regulating single-cell Li-ion power down to 1.5 V for low-power sensor node projects.
• Portable Medical Devices: Replacing disposable cells in home health monitors and digital thermometers.

Equivalent Models:

• Buck-1.5V Mini Module: A similar ultra-small DC-DC step-down buck converter tuned for 1.5 V output.
• AMS1117-1.5: A linear regulator alternative, although it exhibits lower conversion efficiency compared to switching buck converters.
• TPS62200 Step-Down Converter: An integrated circuit alternative for custom embedded board designs targeting 1.5 V power conversion.

Package Includes:

• 1 x 3V-4.2V Li-ion Battery to 1.5V AA/AAA Dry Cell Converter Module