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TPS7B87-Q1: Whether 4 pin and 5 pin are connected?

Rhea Gao
Expert 1205 points
Part Number: TPS7B87-Q1
Other Parts Discussed in Thread: TPS7B4253-Q1, TPS7B4254-Q1

Hi，

The sample of TPS7B8750QDDARQ1 I purchased found that pin 4 and pin 5 were connected together, is this correct?

And the manual is NC, I before the fourth pin is the feedback function.

In addition, I used TPS7B4253QDDARQ1 before, because the supply is in short supply, please help to recommend suitable P2P replacement products, many thanks~

  • 0
    TI__Mastermind 33455 points

    Hi Rhea,

    I am looking into the TPS7B87-Q1 pins 4/5 question and I'll get back to you in 1-2 business days. 

    I am contacting a colleague for help with a P2P recommendation. 

    Regards,

    NIck

  • 0
    TI__Intellectual 2830 points

    Hi Rhea,

    Since TPS7B4253QDDARQ1 is a tracking LDO there is one other option which is P2P, which has half the max output current: TPS7B4254QDDARQ1

      TPS7B4253QDDARQ1 TPS7B4254QDDARQ1
    Generic Part Number TPS7B4253-Q1 TPS7B4254-Q1
    Iout(Max)(A) 0.3 0.15
    Vin(Max)(V) 40 40
    Vin(Min)(V) 4 4
    Vout(Max)(V) 40 40
    Vout(Min)(V) 1.5 2
    Fixed Voltage(V) Special Special
    PSRR @ 100
    KHz(dB)    		 43 43
    Noise(uVrms) --- ---
    Accuracy(%) --- ---
    Dropout voltage
    (Vdo)(Typ)(mV)    		 350 160
    Iq(Typ)
    (mA)    		 0.04 0.06
    Output capacitor type      Ceramic, Non-Ceramic Ceramic, Non-Ceramic
    Thermal resistance
    θJA(°C/W)    		 45 45
    Operating temperature
    range(C)    		 -40 to 125 -40 to 125
    Package size: mm2 42 mm2: 6.4 x 6.5 (HTSSOP|20), 19 mm2: 3.9 x 4.89 (SO PowerPAD|8) 19 mm2: 3.9 x 4.89 (SO PowerPAD|8)
    Package SO PowerPAD|8 SO PowerPAD|8
    Pin 1 OUT OUT
    Pin 2 NC NC
    Pin 3 GND GND
    Pin 4 FB FB
    Pin 5 REF REF
    Pin 6 GND GND
    Pin 7 NC NC
    Pin 8 IN IN

    Regards,

    Andres

  • 0 in reply to Nick Butts
    Expert 1205 points

    Hi Nick,

    We have found the cause of the problem. Thank you very much for your support!

  • 0 in reply to Andres Sagredo
    Expert 1205 points

    Hi Andres,

    OK, Many thanks~

  • 0 in reply to Rhea Gao
    TI__Mastermind 33455 points

    Hi Rhea,

    Great! I'll close this post then.

    Regards,

    Nick