2S 8.4V Type-C Buck-Boost Lithium Battery Fast Charging Module

2S 8.4V Type-C Buck-Boost Lithium Battery Fast Charging Module is a high-efficiency switch-mode step-up/step-down 2-series (2S 7.4V nominal / 8.4V full charge) lithium-ion and LiPo battery charger module with a USB Type-C input port. Capable of accepting 5V standard USB power or 9V/12V QC/PD fast-charging inputs, its synchronous buck-boost architecture automatically steps up 5V USB to 8.4V or steps down higher fast-charge voltages to charge 2S 18650 battery packs smoothly and rapidly with minimal heat generation.

Key Features:

• Automatic Buck-Boost Regulation: Charges 2S (8.4V) lithium packs seamlessly whether the USB-C input is below (5V), equal to, or above (9V/12V) the battery voltage.
• QC / PD Fast-Charge Input Support: Negotiates higher input voltages from fast-charging USB-C adapters to maximize 2S charging speed.
• Precision 8.40V CC/CV Termination: Full trickle pre-charge, constant-current fast charge, and 8.40V ±1% constant-voltage cut-off.
• Integrated Safety Protections: Built-in input overvoltage, battery overcharge, overcurrent, short-circuit, and thermal shutdown protection.
• Compact Footprint: Ultra-small PCB easily integrates inside 7.4V portable speakers, handheld tools, and RC transmitters.

Technical Specifications:

• Target Battery Configuration: 2S (2-Series 3.7V Li-ion / LiPo Cells — 7.4V Nominal, 8.4V Charged)
• Input Interface: USB Type-C Female Receptacle + VIN/GND Solder Pads
• Input Supply Voltage: 5.0V to 12.0V DC (Up to 15V/20V on fast-charge variants)
• Charge Cut-off Voltage: 8.40V ± 1%
• Charging Current: Up to 2.0 A – 3.0 A (Input power dependent)
• Conversion Efficiency: Up to 94%
• Operating Temperature Range: -20°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided High-Conductivity Fiberglass Board
• Power Inductor: Shielded SMD Alloy Power Inductor
• Terminations: USB-C female port and through-hole pads for BAT+, BAT-, and BM (balance sense)
• Weight: Approximately 3.2 grams

Dimensions:

• Length: 32.0 mm
• Width: 18.0 mm
• Height: 5.5 mm

Pinout and Wiring:

• USB Type-C Port / VIN+ & GND: Connect to a 5V USB wall charger or QC/PD fast-charging Type-C adapter.
• B+ (BAT+): Connect to the main Positive (+8.4V) terminal of the 2S lithium battery pack.
• B- (BAT-): Connect to the main Negative (0V) terminal of the 2S lithium battery pack.
• BM (Mid-Point): Connect to the 4.2V center junction between Cell 1 and Cell 2 (if balance pad is provided on board).

Datasheet Reference:

• Refer to the Integrated 2S USB-C Buck-Boost Li-Ion Charger SoC (IP2326 / SC8815) Datasheet for balance and current resistor settings.

Commonly Used in:

• 2S 7.4V Bluetooth speakers, wireless microphones, and portable audio amplifiers
• 7.4V cordless rotary tools, electric screwdrivers, and handheld vacuum cleaners
• RC transmitter battery packs and 2S robotics power supplies
• Portable medical and test measurement instruments

Applications:

• 5V USB to 8.4V 2S Charging: Charging 7.4V 2S battery packs from any standard 5V USB port without needing a dedicated 8.4V wall brick.
• USB-C Device Modernization: Upgrading legacy barrel-jack 8.4V devices to universal USB Type-C fast charging.

Equivalent Models:

• TP5100 2A 1S/2S Buck Charger Module: Step-down only 2S charger requiring a 9V–18V DC input source.
• 3S 2A Step-Down/Boost Charger Board: 3-series (12.6V) lithium battery charging module.

Package Includes:

• 1 × 2S 8.4V Type-C Buck-Boost Lithium Battery Fast Charging Module