TP5100 1S 2S 2A Lithium Battery Charger Module 4.2V 8.4V Step-Down Charging Board

The TP5100 1S 2S 2A Lithium Battery Charger Module is a highly efficient, synchronous buck step-down charging board designed for single-cell (1S) or dual-cell (2S) lithium-ion and lithium-polymer batteries. Operating across a wide input voltage range from DC 5V up to 15V, this powerful power management solution uses switching step-down technology to deliver up to 2A of continuous charging current with significantly less heat generation compared to traditional linear charging circuits.

A key highlight of this module is its dual-mode versatility. By default, the module is configured to charge a single-cell 1S battery up to a safe 4.2V termination limit. By simply bridging the clearly marked onboarding “SET” solder pads, the module shifts into high-voltage 2S mode, boosting the target charge profile to handle a 2-cell 8.4V battery pack. Utilizing a complete CC/CV (Constant Current/Constant Voltage) charge algorithm alongside integrated thermal, short-circuit, and undervoltage protection, the TP5100 is an incredibly robust choice for multi-cell 18650 power walls, handheld test gear, custom wireless appliances, and demanding DIY hardware builds.

• Dual-Cell Versatility: Seamlessly handles 1S (4.2V) or 2S (8.4V) battery configurations via a simple onboard SET jumper bridge.
• 2A High-Current Charging: Delivers up to 2A of continuous charging current to rapidly replenish high-capacity lithium banks.
• Synchronous Buck Architecture: Switching regulator design ensures up to 90% power conversion efficiency, lowering component heat.
• Wide Input Compliance: Accepts a broad range of input voltages from DC 5V up to 15V, allowing compatibility with diverse power bricks.
• Comprehensive Safety Circuitry: Features integrated overtemperature protection, automatic shutdown on short circuits, and under-voltage lockout.

• Main Control Chip: TP5100
• Input Voltage Range: DC 5V – 15V (Input voltage must be at least 1V higher than the target battery termination voltage)
• Default Output Profile: 1S Configuration (4.2V Target Charging Voltage)
• Jumper Output Profile: 2S Configuration (8.4V Target Charging Voltage via SET pad short-circuiting)
• Maximum Charging Current: 2A (Can be modified by altering the onboard R100 sense resistors)
• Status Indication: Onboard dual-state LED pads (Red for charging, Green for standby / charge complete)

If you want, tell me if you need help with:

• Creating a guide on how to bridge the SET pads to change cell settings
• Writing step-by-step calculations to safely change the R100 sense resistors for low-current charging (like 1A)
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