TLV61220: TLV61220 Low power output

allan chiang

Part Number: TLV61220

What is currently encountered is that when VIN is between 0.57 and 0.64V, tlv61220 will suddenly “keep” when Iout is loaded.
High current, but the input has not dropped below 0.5V, 61220 can not enter TURN OFF MODE.
If USER uses a battery that is already running out of power for the DEVICE, we fear that the BATTERY voltage will be pulled down to around 0.6V.
On the other hand, the TLV61220 KEEP has a large current and eventually leaks from the battery.

Would like to ask when the input power 0.57 ~ 0.64V, the output is 50mA behavior is correct?

PS:Test conditions for power supply set 50mA CC Output

over 7 years ago

0 Jasper Li over 7 years ago

TI__Mastermind 46905 points

i didn't see the issue here. the device just try to boost the input voltage to regulated output. but it fail as the load is larger than its capability. also note that the efficiency is not good at this low input voltage.
what is the output voltage?

0 allan chiang over 7 years ago in reply to Jasper Li

Intellectual 620 points

Output power 3.3V

0 Jasper Li over 7 years ago in reply to allan chiang

TI__Mastermind 46905 points

what is the output current? does the IC become normal if loading is removed.
Could you share the schematic and the part number of the inductor?

0 allan chiang over 7 years ago in reply to Jasper Li

Intellectual 620 points

SNR2010K-4R7M.PDFPlease refer to Annex

0 allan chiang over 7 years ago in reply to allan chiang

Intellectual 620 points

what is the output current? =>please refer

does the IC become normal if loading is removed.=>yes

Could you share the schematic and the part number of the inductor?=>refer below.

0 Jasper Li over 7 years ago in reply to allan chiang

TI__Mastermind 46905 points

i refer to the current flowing out of the BT_3P3V.
the inductor is OK.
please measure the SW, BT_3P3V pin voltage waveform at the same time when this issue trigger
could you also share the layout?

0 allan chiang over 7 years ago in reply to Jasper Li

Intellectual 620 points

I think we shouldn't need Layout. We are discussing the specification problem now. When TLV61220 is at Input voltage 0.57~0.64V, when Iout is loaded, tlv61220 will suddenly “keep” at high current (50mA). We are afraid that the BATTERY voltage will occur. Pulled down to about 0.6V, while TLV61220 KEEP has a higher current and eventually the battery leaks

0 Jasper Li over 7 years ago in reply to allan chiang

TI__Mastermind 46905 points

OK.
could you measure the VIN and SW waveform after the input current reaching 50mA (also zoom in the switching waveform)? so i can analysis what happen. and how much current is added as the load?

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TLV61220: TLV61220 Low power output