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TLV773: LDO recommendation question

Dane Zhang
Expert 7715 points
Part Number: TLV773
Other Parts Discussed in Thread: TLV759P, TPS746

Hi team,

could you help to see below request? do we have recommendation for a low cost LDO?

Project: Smart door lock
Selection requirements: 1. Power supply voltage: the minimum input voltage is not greater than 3.6V, and the maximum input voltage is not less than 6.4V;
2. Static power consumption is not greater than 50uA;
3. Low voltage difference; convert to 3.3V
4. The maximum output current is >=0.8A; the maximum output current is 0.4A.

  • 0
    TI__Expert 6410 points

    Hi Dane,

    Let me see if I understand the requirements, we need a single output LDO that meets these specs:

    • Vin: 3.6V to 6.4V range
    • Vout: 3.3V
    • IQ: 50uA
    • Iout: 400mA to 800mA range

    Regards,

    Andres

  • 0 in reply to Andres Sagredo
    TI__Expert 7715 points

    Hi Andres,

    yes, do we have some recommendation on the proper device?

  • 0 in reply to Dane Zhang
    TI__Expert 6410 points

    Hi Dane,

    Either TLV759P or TPS746 might be able to fit here, the only thing is the Vin range might go above the recommended conditions. Another thing is that in the scenario where Vin=6.4V and Iout=800mA the temp increase will be close to 99ºC. In other scenarios the power dissipation should be much lower.

    Quick look at the specs here:

      TLV759P TPS746
    Iout(Max)(A) 1 1
    Vin(Max)(V) 6 (6.5 abs max) 6 (6.5 abs max)
    Vin(Min)(V) 1.5 1.5
    Vout(Max)(V) 5.5 5.5
    Vout(Min)(V) 0.55 0.55
    Fixed output options(V) ADJ ADJ
    PSRR @ 100
    KHz(dB)    		 45 45
    Noise(uVrms) 53 53
    Accuracy(%) 1 1
    Dropout voltage
    (Vdo)(Typ)(mV)    		 190 190
    Iq(Typ)
    (mA)    		 0.025 0.025
    Features     EN EN, Power-good
    Thermal resistance
    θJA(°C/W)    		 80 80
    Operating temperature
    range(C)    		 -40 to 125 -40 to 125
    Package size: mm2 4 mm2: 2 x 2 (WSON|6) 4 mm2: 2 x 2 (WSON|6)

    Regards,

    Andres