TPS61021A: The relationship between input current in on load and quiescent current mentioned in datashhet

Zhipeng Zheng

Part Number: TPS61021A

Hi,

What is the relationship among input current in no load, quiescent current into current into VIN pin and quiescent current into current into VOUT pin mentioned in datasheet?

The input current of power supply in no load is 80uA.

What is the detail engineering meaning of quiescent current into current into VIN pin and quiescent current into current into VOUT pin?

Thanks!

over 8 years ago

0 Helen chen over 8 years ago

TI__Mastermind 40080 points

no load current and the quiescent current is a totally different concept. no load current is tested when the IC is still switching while the quiescent is tested while the IC no switching. so the quiescent is much lower than the no load current.

please check the following picture:

0 Zhipeng Zheng over 8 years ago

Prodigy 50 points

Why have quiescent current into current into VOUT pin while the IC no switching. Since rectifier PMOS FET is turned off.

0 Helen chen over 8 years ago in reply to Zhipeng Zheng

TI__Mastermind 40080 points

The quiescent current is tested when the IC is enabled and no switching. no switching is realized by pull Vref to a value higher than Vref+0.1V through external voltage source, makes the IC no switching. So the Vo still has voltage under this test condition.

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TPS61021A: The relationship between input current in on load and quiescent current mentioned in datashhet