[ AP2200]

MS1462-E-00

6

1.

Operation overview

the step-up converter, the low voltage startup circuit stops and the step-up converter starts. After that,

level. For the application where an external PMOS load switch is connected to the LC pin, when the

LC pin becomes a low level, the external switch is turned ON to start the power supply to the

equipment. However, if one of the conditions below is met, the external load switch is turned OFF to

stop the power supply:

 The STBY pin is set to a high level:

applying voltage, the external load switch is turned OFF to stop the power supply. The step-up

converter is still running even in a standby state. When the STBY pin is set to a low level

 The VB pin voltage is less than or equal to V

lower, a battery is assumed to be removed and the external load switch is turned OFF to stop

to be reinserted and the external load switch in turned ON to start the power supply.

To disable this function, connect the VB pin to the VOUT pin.

 The VOUT pin voltage is less than or equal to V

the power supply is restarted.

 When sampling the open circuit voltage (V

The AP2200 turns OFF the external load switch as well as pausing the voltage step-up

operation. When the sampling of the open circuit voltage comes to an end, the voltage step-up

power supply from the solar cell(s) decreases, and the step-up converter cannot increase the

voltage sufficiently.

OPERATION DETAILS