TPS3840DL28DBVR

1 Features

· Wide operating voltage:1.5V to 10V

· Nano supply current:300 nA(Typ),700 nA(Max)

· Fixed threshold voltage(Vr.)

  -Threshold from 1.6 V to 4.9 V in 0.1-V steps

  -High accuracy:1%(Typ),1.5%(Max)

  -Built-in hysteresis(Vrr+)

    -1.6V<VT.≤3.0V=100mV(Typical)

    -3.1VsVr.<4.9V=200 mV(Typical)

· Start-up delay(tsrRT):220 uS(Typ),350 us(Max)

· Programmable reset time delay(to):

  -50 us(no capacitor) to 6.2s(10-uF)

· Active-low manual reset(MR)

· Three output topologies:

  -TPS3840DL: open-drain, active-low (RESET), requires pull-up resistor

  -TPS3840PL: push-pull, active-low(RESET)

  -TPS3840PH: push-pull, active-high(RESET)

· Wide temperature range:-40°℃ to +125℃

· Package: SOT23-5(DBV)

2 Applications

· Grid infrastructure: circuit breaker, smart meter, other monitoring and protection equipment

· Factory automation: field transmitter, PLC.

· Building automation: fire safety, smoke detector, and HVAC

· Electronic point of sale

· Portable, battery-powered systems

3 Description 

Wide Vin allows monitoring 9V rails or batteries without external components and 24V rails with external resistors. Nano-lq extends battery life for low power applications and minimizes current consumption when using external resistors. Fast start-up delay allows the detection of a voltage fault before the rest of the system powers up providing maximum safety in hazardous start-up fault conditions. Low Power-on-Reset (Vpon) prevents false resets, premature enable or turn-on of next device, and proper transistor control during power-up and power-down.

Reset output signal is asserted when the voltage atVop drops below the negative voltage threshold(Vr.) or when manual reset(MR) is pulled to a low logic (VMR L). Reset signal is cleared when Vop rise above Vr. plus hysteresis (Vrr+) and manual reset is floating or above Vwa H and the reset time delay(to) expires. Reset time delay can be programmed by connectinga capacitor between CT pin and ground. For a fast reset CT pin can be left floating.

Additional features: Built-in glitch immunity protection for MR and Voo, built-in hysteresis, low open-drain output leakage current(lLxc(op).

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