Tiny 1-cell Li-ion/LiPo power board that charges your 3.7 V cell and boosts to 5 V for your load. Up to 2.1 A 5 V output, battery protection on-board, button-controlled output, and 4-level LED fuel gauge. Great for DIY power banks, sensor nodes, and portable gadgets. Highlights Charge + boost on one board (simultaneous supported) 5 V output up to 2.1 A, stable during plug/unplug Built-in protections: OVP/OCP/OTP/short-circuit Button (KEY) to enable/disable output; 4-level charge/discharge LEDs Ultra-small: 25 × 16 mm, 2.54 mm pad pitch Specs Property Value Battery 1× Li-ion/LiPo (3.7 V nominal, 4.2 V full) Charge Input 4.6–5.4 V (typ. 5 V), 2–3 A capable source Charge Current 0–2.1 A (CC/CV to 4.2 V ±1%) Discharge (to load) 5 V, 0–2.1 A (boost) Extra Discharge Headroom Internal path rated up to ~3.5 A (see thermals) Efficiencies Boost ≤92% • Charge ≤91% • Discharge ≤96% Quiescent Charge ~100 µA • Discharge ~50 µA Indicators 4× LEDs for charge/discharge level + status Pads 2.54 mm pitch, Ø1.0 mm holes Size / Temp 25 × 16 mm, −20…+85 °C Pads / Pinout IN+ / IN− → 5 V input (USB/5 V rail) for charging BAT+ / BAT− → single Li-ion/LiPo cell 5V / GND → boosted 5 V output to your load KEY → onboard pushbutton controls 5 V output (logic not exposed) Usage modes (quick) Charge + Power Load: connect 5 V to IN, cell to BAT, load to 5V. Charge-only: connect 5 V to IN, cell to BAT, leave 5V unused. Boost-only: connect cell to BAT, use 5V to power your circuit. What’s in the Pack 1× DFR1026 5 V/2 A charge/boost module
