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Platform forum

Deberts , 02-10-2026, 02:29 PM

I have designed a circuit that is an interface between a charging system and a LiR1054 battery. I chose TPS22916CNYFPR to use the RCB feature to prevent the charging terminals from being active when removed from the charging station. This is needed to prevent possible short circuits and/or electrical leakage. The issue that I have is that the terminals will remain powered unless I short B1 to B2 momentarily, then the terminals are isolated as needed. I've attached a schematic of the circuit.

The reverse voltage measured on the pogo pads (P1_+ and P2_-) is the same as the battery voltage, 4.2V on a freshly charged battery. There is enough current coming through the pins to light a standard LED and keep it lit. When I attempt to measure amps using a multimeter, the switch immediately shuts off all current.

The pogo pads P1_+ and P2_- are on the bottom side of the circuit board and interact with the pogo pins on the charger. These are the pads that need to be isolated when off of the charger. The BAT_+ and BAT_- pads are where the battery is connected by wires. I've included a picture of the top of the circuit board. Ignore the TR and TS pads as they are a completely different circuit used for the battery thermistor and do not connect or interact with any other portion of the circuit, they are only connected to 2 pogo pads on the bottom side of the board that the charger uses to sense temperature. The Red arrow shows the location of the switch.

QDrives , 02-10-2026, 05:09 PM

TPS22916CNYFPR latching on and not turning off when ON current is removed.

QDrives , 02-11-2026, 02:07 AM

Let me be a school teacher here.
Step 1 - rotate the symbol of U1 180° so that the inputs are on the left and outputs are on the right.
Step 2 - check your schematic again after step 1.

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