LilyPad 5V Step-Up Lithium Battery Boost Power Supply Module

LilyPad 5V Step-Up Lithium Battery Boost Power Supply Module (LilyPad LiPower) is an ultra-compact, wearable DC-DC boost converter board designed to step up the 3.7V output of a single-cell Lithium Polymer (LiPo) battery to a stable, regulated 5.0V DC supply. Equipped with an integrated JST battery socket, onboard slide power switch, charging solder pads, and large sewable connection loops, it provides clean, uninterrupted power for LilyPad Arduino microcontrollers, sensors, and LED networks in smart garments.

Key Features:

• Step-Up Boost Regulation: Efficient DC-DC boost converter steps up 3.0V–4.2V LiPo battery voltage to a steady, regulated 5.0V DC.
• Integrated 2-Pin JST Connector: Standard polarized JST-PH 2.0mm connector allows effortless plug-and-play connection of rechargeable LiPo batteries.
• Onboard Slide Power Switch: Physical latching switch allows easy power on/off switching without unplugging the battery.
• Large Sewable Connection Pads: Gold-plated through-holes allow easy stitching to garment power buses using conductive thread.
• Short-Circuit & Over-Current Protection: Built-in converter protection circuitry ensures safe operation on wearable textiles.
• Rechargeable Battery Terminals: Auxiliary solder pads allow connecting external LiPo charging modules without battery removal.

Technical Specifications:

• Input Battery Voltage: 3.0V to 4.2V DC (single-cell 3.7V LiPo / Li-ion battery)
• Regulated Output Voltage: 5.0V DC ± 2%
• Continuous Output Current: Up to 150 mA continuous (peak 200 mA)
• Efficiency: Up to 85% boost conversion efficiency
• Quiescent Current: Less than 20 µA when switched OFF
• Input Connector: Polarized 2-pin JST-PH (2.0mm pitch)
• Operating Temperature: -20°C to +60°C

Mechanical Specifications:

• Form Factor: Circular LilyPad modular disc profile
• PCB Substrate: 0.8 mm ultra-thin FR4 laminate with purple soldermask
• Pad Plating: Immersion gold (ENIG) over copper for superior conductivity
• Sewing Eyelet Diameter: 3.0 mm inner clearance holes
• Weight: Approximately 3.5 g

Dimensions:

• Diameter: 25.0 mm
• Overall Height: 6.5 mm (including JST socket and switch actuator)
• PCB Thickness: 0.8 mm

Pinout and Wiring:

• + (5V Output): Stitched with conductive thread to LilyPad microcontroller +5V power rail
• – (GND): Stitched with conductive thread to system power ground rail (0V)
• B+ / B- (Charge Pads): Solder connection terminals for routing to external LiPo charging board
• JST Socket: Connects to single-cell 3.7V rechargeable LiPo battery pack

Datasheet Reference:

• Refer to the SparkFun LilyPad LiPower design documentation and boost converter technical specifications for voltage ripple curves, battery discharge cutoff thresholds, and e-textile power isolation guidelines.

Commonly Used in:

• Rechargeable power supplies for interactive e-textile costumes, smart fashion, and stage attire
• Wearable fitness monitors, gesture-sensing gloves, and illuminated smart jewelry
• Cosplay armor and glowing props requiring flat, rechargeable battery power
• Classroom wearable electronics workshops teaching mobile power regulation

Applications:

• Wearable 5V regulated power supply
• LiPo battery step-up booster for LilyPad
• Garment LED power hub
• Portable e-textile power bank
• Rechargeable wearable sensor power source

Equivalent Models:

• SparkFun LilyPad LiPower (DEV-11260)
• Adafruit PowerBoost 500 Shield
• LilyPad 5V Step-Up AAA Battery Booster
• Mini 3.7V to 5V DC-DC Boost Module

Package Includes:

• 1 × LilyPad 5V Step-Up Lithium Battery Boost Power Supply Module