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TPS61261

Part Number: TPS61261
Other Parts Discussed in Thread: TPS61200, TPS61020

Hi Team,

Here are some question need your help:

1. Coudld you kinldy provide the output voltage line/load regulation data under -40~+85℃ ambient temperature?

We only find data under +25℃ in the data sheet.

2. Could Vout mantain 3.3V when Vin=4V?

Thanks and best regards,

Jamie

  • Hi Jamie,

    it should a data measured with the EVM. there is not variation over temperature. but I expect the variation would be small. if you need a accuracy regulated 3.3V at 4V input condition, I would suggest a buck-boost converter instead of this device. 

  • Hi Jasper,

    Are there any buck-boost converters recommended for both following requirements:
    1. input voltage range between 1.2V and 4V, and start-up voltage includes 1.2V
    2. Output voltage 3.3V with 100mA

    I have found that most buck-boost converters need to start up with more than 1.8V,
    but our application should start-up with 1.2V in some critical condition to record data.

    Thanks and best regards,

    Andrew

  • Hello AndrewLee22,

    You are right, the buck-boost devices are not designed for such a low startup voltage.

    I have one question to your application: When you mention that the converter needs to startup at 1.2V, is the output capacitor discharged during this time or is it already charged to a certain level?

  • Hi Brigitte,

    The output capacitor is discharged when the converter starts up at 1.2V.

    Thanks and best regards,

    Andrew

  • Hi Andrew,

    what about TPS61200 and TPS61020? both device support regulated 3.3V even VIN is higher. but please note that the efficiency at VIN>VOUT condition is low.