TPS51383: LDO Switch-Over function

Zhang Excellent

Part Number: TPS51383

Tool/software:

For TPS51383, when the buck output reaches 98% of VOUT and PGOOD is asserted high and the LDO switch-over function take effects, how much current can be provided from TPS51383?

Will this current be still equal to the case of LDO mode 100mA specified in Electrical Characteristics table below?

If not, how much current can it offer from LDO pin?

5 months ago

0 Aurora Tie 5 months ago

TI__Genius 16950 points

Hi，

For TPS51383, LDO and Buck converter are two independent channels. They each have their own maximum current capability. They will not affect each other. Thank you》

Aurora

0 Zhang Excellent 5 months ago in reply to Aurora Tie

Prodigy 140 points

Hi Tie,

You might have not understood my question.

I asked how much is the current capacity of LDO when the switch over function take effects.

0 Aurora Tie 5 months ago in reply to Zhang Excellent

TI__Genius 16950 points

Hi,

When the switching conditions are met, the output current will all flow from the buck. The buck output replaces the LDO output. This LDO is designed for powering external circuits that require constant power even when switching regulator is off (Vin > UVLO, EN = LOW). Thanks.

Aurora

0 Zhang Excellent 5 months ago in reply to Aurora Tie

Prodigy 140 points

Hi Tie,

So the current capacity of LDO pin is as same as buck output when the switch-over takes effect,right?

0 Aurora Tie 5 months ago in reply to Zhang Excellent

TI__Genius 16950 points

Hi,

Yes, you're right. Thanks.

Aurora

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TPS51383: LDO Switch-Over function