TPS7A02: Expected Low Current consumption at the output.

Vinayak Potadar

Part Number: TPS7A02
Other Parts Discussed in Thread: TPS62740,

Hello TI team,

We are developing low power (Battery oriented ) device using MSP430 MCU. as earlier Discussion with TI team we shifted from TPS62740 (BUCK Converter) https://www.ti.com/product/TPS62740 to

TPS7A0225PDBVR (LDO) https://www.ti.com/product/TPS7A02#design-tools-simulation

These are our Values

V(In)=3.5V

V(Out)=2.5V

I(Out)=up to 200mA

I(q) would be better if it is nA

After Implementing new design (LDO) to our Device it is observed that our device starts consuming more Current than that of earlier DC-DC converter.

DC-DC used to consume up to 2.5-3mA during normal conditions.

while New LDO is consuming more than 6mA in normal condition

I have attached our LDO schematic here.

Regards,

Vinayak

over 3 years ago

0 Kyle Van Renterghem over 3 years ago

TI__Genius 13345 points

Hi Vinayak,

TPS7A02 is the industry's lowest Iq LDO (by a significant margin) and even when the output is loaded with 200mA, the ground current of the LDO is well below a milliamp (see plot below). Have you confirmed where the current is flowing because it doesn't seem likely that it is flowing through the GND pin of the LDO unless the LDO was damaged during PCB assembly (it would have been tested to be working properly before shipping out from TI).

Another thing to check is that the output is stable, if there is an oscillation at the output then you will often see the current increase due to the constant transients occurring.