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TPS62745: I need a buck converter with similar spec of above mentioned part number, but with a different out put voltage and temperature

Part Number: TPS62745

Specifications: 

Input Voltage: 1.8,2,3.3V- 30V

Temperature range: –55°C to 85°C

Output current: above 6mA 

Switching Frequency: Should be greater than 100KHZ

Ripple frequency: In the range of 100KHZ

Buck converter with intrinsic safety feature is required(Lower value inductor(Max 10uH) and Lower value capacitor(20uF-sum of CIN and COUT)

  • Hello Aswin, 

    Few question to help us provide the right device: 

    • For the temp range, is that your ambient temperature of junction?
    • What is the max current, you provided min of 6mA, but is the max? 
    • What is the out put voltage, you said different than 62745, can you provide a range? 
    • VIN, I see you required 1.8V and 30V, are they min and max VIN range? or you expect the device to operate above these. I am looking for ABS max condition. like the TPS62745, its abs max is 12V but ROC is 10V. 

    Thanks! 

    Tahar

  • Hi Tahar,

    Yes, the temperature range given is the ambient temperature of the required device (-55-80 C above).

    The required current is 6mA and we can consider maximum of 10mA.

    Required output Voltage: 3.3V

    1.8V and 30V Is the MIN and MAX value of VIN

    I need this wide range of input because it is powered with a 4-20mA input signals, so it needs to satisfy the DC-DC startup condition.

  • Hi Aswin,

    TPS62745 does not meet your application.

    1. The absolute minimum junction temperature is -40C, could not operate at -55C.

    2. Min input voltage is 3.3V and could not work at 1.8V to generate 3.3V since it is Buck converter.

    Please search other devices on ti.com.

    Thanks,

    Nancy

  • Hi Nancy,

    I cant find one that is why I had requested your help. Kindly help me to find a part which suits these specifications

    Specifications: 

    Input Voltage range : 1.8,2,3.3V- 30V

    Output Voltage:3.3V

    Temperature range: –55°C to 85°C or above

    Output current: above 6mA 

    Switching Frequency: Should be greater than 100KHZ

    Ripple frequency: In the range of 100KHZ

    Buck converter with intrinsic safety feature is required(Lower value inductor(Max 10uH) and Lower value capacitor(20uF-sum of CIN and COUT)

  • Hi Aswin,

    I searched on ti.com and found 6 parts may suit your spec. I am not supporting those parts. If you need further support, can contact support team from E2E.

    See my attached file.

    Buck-boost search.pptx

    I will close this post and you may open a new one if needed.

    Thanks,

    Nancy

  • Can you please share the mentioned 6 parts?

  • Hi Aswin,

    We don't support Buck-boost converter and are not familiar with those parts. Please check the datasheet on ti.com and post a new E2E with buck-boost part number if you have any questions for those parts. The expert will help you there. I will close this post.

    Hope this helps,

    Thanks,

    Nancy

  • Hi can you suggest me a part with lower input volatge range like 2-15V and meeting all other requirements. Also need high efficiency. Please suggest me the part as soon as possible. It could be helpful

  • Hi Aswin,

    The input is 2V-15V. What is output voltage? If output is 3.3V. You need a buck-boost converter. Please create a new post with topic Buck-boost converter, then Buck-boost team will help you. I only support Buck.

    Thanks,

    Nancy