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TLV704: Looking for 6V with same pinout as TLV70450DBVT

Scott Swanson
Prodigy 210 points
Part Number: TLV704
Other Parts Discussed in Thread: LM317,

Using TLV70450DBVR SOT-23-5 for 5V out at up to 150mA with 5.5-11V in. 

We are needing 6V out, and cannot find a part with pinout close to this. Pin 1=GND is an odd part. A lot of ths SOT-23-5 use pin 4 and 5 as input and output. 

1. Can you help us find a pin compatible part ? (I found TPS709B50 has same poinout, but there is no 6V part), TPS70960 has different pinout)

2. If not, can we use this as an adjustable to get 6V (like typically used on the LM7805)... 

Thanks

  • 0
    TI__Expert 5396 points

    Hello Scott,

    Unfortunately, we don't have an option here if you want to keep the same pin out. We would recommend looking at our Adjustable options TLV709A01DBVR or TPS7A2401DBVR in standard SOT-23 pin outs.

    Regards,

    Prakash L

  • 0
    Prodigy 210 points

    If not, Can we use this as an adjustable to get 6V (like typically used on the LM7805)... ??

    In other words, put a resistor (Rb) between pin 1 and GND, and another (Rt) between pin 3/output and pin 1 as a voltage divider, like on a LM317 or LM7805

    Vo = 5(1+Rt/Rb) - I mean we are going to try it anyways.. If so, is there any unforseeable issue with this plan ? 

  • 0 in reply to Scott Swanson
    TI__Expert 5396 points

    Scott,

    I am checking with our systems engineer. This device is a fixed version and also the max. Vout rating is 5V, so that would be another issue too here.

      TLV704
    Iout(Max)(A) 0.15
    Vin(Max)(V) 24
    Vin(Min)(V) 2.5
    Vout(Max)(V) 5
    Vout(Min)(V) 3
    Fixed output options(V) 3, 3.3, 3.6, 5
    PSRR @ 100
    KHz(dB)    		 42
    Noise(uVrms) 550
    Accuracy(%) 2
    Dropout voltage
    (Vdo)(Typ)(mV)    		 400
    Iq(Typ)
    (mA)    		 0.003
    Output capacitor type      Ceramic
    Thermal resistance
    θJA(°C/W)    		 213
    Operating temperature
    range(C)    		 -40 to 125
    Package size: mm2 5 mm2: 1.6 x 2.9 (SOT-23|5)
    Packages SOT-23|5

    Regards,

    Prakash L

  • 0 in reply to Prakash Lakhit
    TI__Expert 5396 points

    Scott,

    Please see below information from Systems engineer.

    Raising the local LDO ground by 1V using Rt. So technically, the LDO GND pin will see 1V as potential voltage. The voltage difference between LDO out pin and LDO gnd pin will be 5V. and Overall potential level and LDO out will be 6V w.r.t. to actual ground of the system. 

    But one different that we need to highlight is that the output equation will have an error related to the IQ of the LDO also. 

    So the Vout = 5(1+(Rt/Rb)) + Iq*Rt which can lead to variation in LDO output and accuracy spec can be violated.

    Thanks,

    Prakash L