NCP436, NCP437 3A Ultra-Small Controlled Load Switch with Auto-Discharge Path The NCP436 and NCP437 are very low Ron MOSFET controlled by external logic pin, allowing optimization of battery life, and NCP436, NCP437 PIN FUNCTION DESCRIPTION Pin Name Pin Number Type Description IN A2, B2 POWER Loadswitch input voltage connect a 1 F or greater ceramic capacitor from IN to GND as close as possible to the IC. GND C1 POWER Ground connection. EN C2 INPUT Enable input, logic high turns on power switch. OUT A1, B1 OUTPUT Loadswitch output connect a 1 F ceramic capacitor from OUT to GND as close as possible to the IC is recommended. BLOCK DIAGRAM IN: Pin A2, B2 OUT: Pin A1, B1 Gate driver and soft start control Control logic EN: Pin C2 Optional: NCP437 EN block GND: Pin C1 Figure 2. Block Diagram