TPS613221AEVM: TPS613221ADBVR

alex alex

Part Number: TPS613221AEVM

Hello. The datasheet of TPS613221ADBVR select - Iq in VOUT = 6.5uA. What did it mean? What is the input (Quiescent) current if: Vout=3.3V, Iout=0mA, Vinput=1.5V?

over 2 years ago

0 Wenhao Wu over 2 years ago

TI__Genius 9046 points

Hi Alex,

Please refer this article about definition of IQ. Thanks!

e2e.ti.com/.../IQ-_2D00_-What-it-is_2C00_-what-it-isn_1920_t_2C00_-and-how-to-use-it.pdf

We measure VOUT IQ through exert an external source on VOUT to make it no switching, VIN is normal, then measure the current into VOUT pin.

-Wenhao

0 alex alex over 2 years ago in reply to Wenhao Wu

Prodigy 40 points

Those I understand correctly that the input current at Vin = 1.5V and no load will be about 15 μA? ((3.3*6.5)/1.5)+0.5=14.8uA

0 Wenhao Wu over 2 years ago in reply to alex alex

TI__Genius 9046 points

Hi Alex,

The input current at no load will be much higher than that number because the device is switching.

The calculation is for IQ alone, and assume efficiency to be 100%.

-Wenhao

0 alex alex over 2 years ago in reply to Wenhao Wu

Prodigy 40 points

I'm just trying to understand what current will be from the 1.5V battery if the device is in sleep mode (while the load current will be about 5uA) if I use TPS613221ADBVR

0 alex alex over 2 years ago in reply to alex alex

Prodigy 40 points

If I understand correctly current from battery without load is - ( (3.3*IqVOUT) / Efficiency / Vin )+IqVIN

Did I understand correctly?

+1 Wenhao Wu over 2 years ago in reply to alex alex

TI__Genius 9046 points

Hi Alex,

You can take the efficiency curve in the datasheet and calculate input current at desired operating point. This can more accurately calculate input current which also takes switching loss into account.

For 1.5Vin, 100uA load, TPS613222A has about 75% efficiency. Therefore the input current is 5*100/1.5/0.75=444.44uA.

-Wenhao

Power management

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TPS613221AEVM: TPS613221ADBVR