BQ24038RHL questions

martin de lange

Prodigy 65 points

1) Can the output be turned off?

2) At what state is the output when the USB power and AC power is disconnected and CE is pulled low?

over 12 years ago

0 Jeffery Pfarr over 12 years ago

TI__Genius 14317 points

CE low disconnects AC and USB inputs from Out but leaves Bat connected to Out. Out is always connected to one of the power sources when present.

I'll ask the device engineers to confirm this.

0 Tahar Allag over 12 years ago in reply to Jeffery Pfarr

TI__Mastermind 32350 points

Jeff,

Your answer is correct. The CE is chip enable pin. The device enters the low-power standby mode when the CE input is low with either AC or USB present. In this mode, internal power FETs, that connect the AC and USB to OUT, are turned off. And the FET that connects the battery (BAT pin) to OUT is turned ON to power the system.

Tahar

0 Jeffery Pfarr over 12 years ago in reply to Tahar Allag

TI__Genius 14317 points

Martin,

We confirmed that this is true whether or not AC or USB inputs are present.

Power management

Power management forum

BQ24038RHL questions