TP5100 2A 4.2V and 8.4V Dual/Single Lithium Battery Charger Module

TP5100 2A 4.2V and 8.4V Dual/Single Lithium Battery Charger Module is a high-efficiency switch-mode step-down lithium battery charger module engineered around the TopPower TP5100 synchronous buck power management IC. Capable of charging either a single-cell (1S 4.2V) or dual-cell series (2S 8.4V) Li-ion / LiPo battery pack at up to 2A continuous current, it operates across a wide 5V to 18V DC input range. Unlike linear chargers that dissipate excess voltage as waste heat, its 400 kHz PWM buck topology achieves up to 92% efficiency with full trickle, constant-current (CC), and constant-voltage (CV) charge management.

Key Features:

• Selectable 1S (4.2V) or 2S (8.4V) Charging: Onboard SET solder jumper selects between single-cell 4.2V and dual-cell 8.4V charging modes.
• High 2A Fast-Charge Output: Delivers up to 2.0A charging current (programmable from 100mA to 2000mA via sense resistors).
• 400 kHz Synchronous Buck Topology: High-efficiency switch-mode regulation minimizes thermal dissipation even with 12V–18V inputs.
• Comprehensive Safety Suite: Built-in input overcurrent, undervoltage lockout, battery temperature monitoring, short-circuit, and reverse battery protection.
• Dual-Color Charging Indicator: Onboard red (charging) and blue/green (standby/charged) SMD LEDs with external LED breakout pads.

Technical Specifications:

• Charger Controller IC: TopPower TP5100 PWM Buck Charger
• Input Supply Voltage: 5V to 18V DC (Recommended: 5V–12V for 1S; 9V–15V for 2S)
• Charge Cut-off Voltage: 4.20V ± 1% (1S mode) / 8.40V ± 1% (2S SET shorted)
• Maximum Charging Current: 2.0 A (Default dual R100 parallel resistors)
• Trickle Pre-charge Current: 10% of programmed fast-charge current
• Switching Frequency: 400 kHz
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: High-density double-sided FR-4 fiberglass board with thermal copper vias
• Power Inductor: Low-profile shielded 6.8μH / 10μH SMD power inductor
• Terminals: Through-hole solder pads for IN+, IN-, BAT+, and BAT- connections
• Weight: Approximately 3.5 grams

Dimensions:

• Length: 25.0 mm
• Width: 17.0 mm
• Height: 5.0 mm

Pinout and Wiring:

• IN+ / VIN+: Positive DC Power Supply Input (5V–18V DC).
• IN- / GND: Power Supply Negative / Common Ground.
• BAT+: Positive Output to 1S (4.2V) or 2S (8.4V) Lithium Battery Pack.
• BAT-: Negative Output to Lithium Battery Pack.
• SET Jumper Pad: Leave open for 1S (4.2V) single-cell charging; bridge with solder for 2S (8.4V) dual-cell charging (Input must be ≥9V for 2S mode).

Datasheet Reference:

• Refer to the official TopPower ASIC TP5100 1S/2S 2A Switching Charger IC Datasheet for current-setting resistor formulas and thermal layouts.

Commonly Used in:

• 2S 7.4V (8.4V peak) portable speaker, handheld radio, and robotics battery packs
• High-capacity 1S parallel 18650 and 21700 battery packs requiring 2A rapid charging
• 12V automotive and solar DC-powered lithium battery charging stations
• Portable medical instruments, barcode scanners, and industrial handheld terminals

Applications:

• Dual-Cell 2S Li-ion Charging: Directly charging 2S 18650 battery packs from a standard 12V DC wall adapter.
• High-Current 1S Charging: Replacing 1A linear TP4056 boards where higher charge speed and lower heat are required.
• Embedded Battery Systems: Compact PCB integration into custom battery-operated enclosures.

Equivalent Models:

• TP4056 1A Linear Charger Module: Lower-cost 1S-only 5V linear charger suitable for currents up to 1A.
• TP5000 1A Buck Charger Module: Single-cell switch-mode charger supporting 4.2V Li-ion and 3.6V LiFePO4 chemistries.
• MP26123 / BQ24133 Switching Charger: Multi-cell synchronous buck battery charger IC modules.

Package Includes:

• 1 × TP5100 2A 4.2V and 8.4V Dual/Single Lithium Battery Charger Module