TPS61322: Keep Burning TPS613222ADBVR Chips With A TRF7970A Load

Robert S

Part Number: TPS61322
Other Parts Discussed in Thread: TRF7970A, , TPS61299

Tool/software:

I have a circuit with a 3.7V LC26650 battery feeding a booster TPS613222ADBVR to get an output of 5V. I have tested the circuit in the picture below with and without the diode between SW and VOUT. The load is a microcontroller controlling a TI NFC chip TRF7970A with an NFC passive antenna. This load circuit is not supposed to go over 220mA in current. I keep burning the TPS613222ADBVR chips. They get fried. The load works fine with 5V coming from a power supply. As soon as I connect the TPS613222ADBVR circuit to the load, I get the smoke. I have no idea what I'm doing wrong. I'm using a breadboard. What do you recommend me to do? Should I use another DC booster? Any help is greatly appreciated. Thanks.

2 months ago

0 Nini Zhong 2 months ago

TI__Genius 13715 points

Hi Robert,

The input peak current of TPS61322A is 1.1A, that means if could only support if you are using a bread broad the connection might be not very solid. What is L1 ? and C1. I recommend you apply an EVM board to test , both TPS61322 or TPS61299 EVM board.

0 Robert S 2 months ago in reply to Nini Zhong

Intellectual 550 points

Hi Nini,

I'm using the L1 and C1 recommended in the datasheet. I will get the EVM. I'm thinking that the TRF7970A with an NFC passive antenna is very inductive and that might be getting the chip fried. What do you think?

0 Nini Zhong 2 months ago in reply to Robert S

TI__Genius 13715 points

Hi Robert,

Please try the EVM board firstly . Keep me well known about the EVM test. Did you apply TPS61299EVM as well?

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TPS61322: Keep Burning TPS613222ADBVR Chips With A TRF7970A Load