HY2213-BB3A

The HY2213-BB3A is a one-cell lithium-ion charge-balance IC from HYCON Technology, in SOT-23-6, with one device fitted per cell in a multi-cell pack. Its built-in high-precision voltage detection circuit watches the cell against an overcharge detection voltage of 4.200 V plus/minus 0.025 V for the BB3A variant, and after a 250 ms detection delay it drives the OUT pin to switch an external balance MOSFET, shunting charge current around the full cell so lagging cells can catch up; balancing releases at 4.190 V plus/minus 0.035 V. The trailing A in BB3A is HYCON's characteristic code for N-MOSFET balance control with OUT active on a low-to-high transition - the B-code siblings drive P-MOSFETs instead, so the letter is functional, not cosmetic. Operating consumption is under 3.5 uA at 3.2 V and standby under 0.5 uA, so the balancer does not itself become a parasitic load, and the family is specified from -40 to +85 degrees C in green, lead- and halogen-free packages. Selection advice: match the detection-voltage variant (AB3B, BB3A, CB3A, FB3A differ) to your cell chemistry's full-charge voltage, and size the external bleed resistor for the balance current your pack capacity needs. Parameters verified against HYCON documentation.