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Original question:

[FAQ] How do I ask a technical question on E2E™︎ support forums?

TPS62A01: TPS62A01DRLR

Sakthi K
Prodigy 130 points
Other Parts Discussed in Thread: TPS62A01

Tool/software:

BQ25180YBGR_Low Volt Cut OFF Test
Vbat(V) SYS_TP2(V) TPS62A01DRLR_TP3(V) out  Drop V
3.223 OFF OFF 0
3.312 3.302 3.276 0.026
3.403 3.394 3.303 0.091
3.503 3.494 3.315 0.179
3.604 3.595 3.303 0.292
4.006 3.997 3.301 0.696

Subject: Inquiry Regarding TPS62A01DRLR LDO Dropout Voltage Issue

Dear Team,

 We are currently working on a battery-operated product where we have integrated the TPS62A01DRLR Low Drop-Out Regulator (LDO) into our design. However, we've encountered an issue regarding the dropout voltage when the input voltage is increased.

Despite our efforts to maintain stable performance within the specified input voltage range, we've noticed that as the input voltage increases, so does the dropout voltage of the LDO. This discrepancy is concerning, especially for our battery-operated application where consistent voltage regulation is crucial for optimal performance and efficiency.

To address this issue and ensure the seamless operation of our product, we kindly request your assistance in understanding the underlying cause of this behavior and potential solutions to mitigate it. Any insights, recommendations, or alternative approaches you could provide would be greatly appreciated.

We look forward to your prompt response and collaboration in resolving this issue.

Regards,

Sathiya

  • 0
    TI__Expert 6510 points

    Hi Sathiya,

    Thanks for using E2E.

    The TPS62A01 is a synchronous step-down buck DC/DC converter. Could you please send me the schematic of your application for a better understanding of your issue.

    Best regards,

    Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 130 points

    Hi

    Thanks for your reply,

    BQ25180YBGR battery charge output in going to TPS62A01 DC/DC converter as input. have any reference design is available. why TPS62A01 output voltage is Drop-Out when input voltage is high.  

    Regards,

    Sathiya

  • 0 in reply to Sakthi K
    TI__Expert 6510 points

    Hi Sathiya,

    The TPS62A01 is a regulator for a constant output voltage. If the configuration is done for 3.3V, the output voltage will be at 3.3V up to a input voltage of 5.5V. This is the target function of this device.

    Best regards,

    Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 130 points

    Hi

    I hope this email finds you well. I am writing to inquire about Low Drop-Out (LDO) regulators suitable for use in a battery-operated wearable device.

    We are currently using [ TPS62A01] in our wearable device, which operates within an input voltage range of 3.3V to 4.7V and requires a stable output voltage of 3.3V. However, we have observed that as the input voltage range increases, the dropout voltage (input-output voltage difference) of the LDO also increases, impacting the efficiency of our device.

    Considering the power efficiency requirements of our wearable device, we are seeking LDO regulators with the following specifications:

    Low dropout voltage to minimize power loss across the regulator.
    Low quiescent current to extend battery life, particularly in standby or low-power modes.
    Suitable for operation in battery-operated devices with an input voltage range of 3.3V to 4.7V.
    Compact package size compatible with wearable device form factor.
    High efficiency and stability across a range of temperatures.
    Could you please recommend any LDO regulators from your product line that meet these requirements? Additionally, if samples or evaluation boards are available, we would greatly appreciate the opportunity to test the recommended LDO regulators in our device.

    We are also interested in any technical documentation, datasheets, and pricing information you can provide for the recommended LDO regulators.

    Regards,

    Sathiya  

  • 0 in reply to Sakthi K
    TI__Expert 6510 points

    Hi Sathiya,

    I will come back to you by tomorrow.

    Best regards,

    Sepp

  • 0 in reply to Josef Marsmann
    Prodigy 130 points

    Hi Thanks,

    Am waiting for your reply.

    Regards,

    Sathiya

  • 0 in reply to Sakthi K
    TI__Mastermind 18250 points

    Hey Sathiya,

    Sakthi K said:
    We are currently using [ TPS62A01] in our wearable device, which operates within an input voltage range of 3.3V to 4.7V and requires a stable output voltage of 3.3V.

    TPS62A01 is not an LDO, its a DC/DC buck converter, This device will regulate the output voltage based upon the selected feedback resistors.

    Please share me the schematic. 

    In case if you are interested in LDO instead of DC/DC buck converter, please create new thread so that it will be assigned to the respective LDO team. 

    If you want me to assign this thread to LDO team, then I can do that as well. please confirm.

    Thank you & regards,

    Moheddin.

  • 0 in reply to Moheddin Pasha Shaik
    Prodigy 130 points

    Hi,

    TPS62A01 DC/DC means why voltage is Drop-Out when input voltage is high kindly confirm?

    Regards,

    Sathiya

  • 0 in reply to Sakthi K
    TI__Expert 6510 points

    Hi Sathiya,

    Some explanation on "Drop-out":

    • The target of an LDO (TPS62A01 also) is to have a constant output voltage over a input voltage range.
    • But we always need a higher input voltage compared to the output voltage.
    • This difference between the output voltage and the min input voltage is called drop-out voltage.
    • Example:  Vout = 3.3V, Drop-out = 0.2V => Vin min = 3.5V
    • The characteristic of a LDO is that this Drop-out voltage is low.
    • If you increase the Vin to 4V the difference between Vin and Vout would be 0.7V, but this is not the drop-out voltage!!!!

    Best regards,

    Sepp