TPS3840 Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay | TI.com

TPS3840 (ACTIVE) Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay

 

Description

Wide Vin allows monitoring 9V rails or batteries without external components and 24V rails with external resistors. Nano-Iq 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 (VPOR) 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 at VDD drops below the negative voltage threshold (VIT-) or when manual reset (MR) is pulled to a low logic (VMR_L). Reset signal is cleared when VDD rise above VIT- plus hysteresis (VIT+) and manual reset is floating or above VMR_H and the reset time delay (tD) expires. Reset time delay can be programmed by connecting a 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 VDD, built-in hysteresis, low open-drain output leakage current (ILKG(OD)).












Features

  • Wide operating voltage: 1.5 V to 10 V
  • Nano supply current: 300 nA (Typ), 700 nA (Max)
  • Fixed threshold voltage (VIT-)
    • Threshold from 1.6 V to 4.9 V in 0.1-V steps
    • High accuracy: 1% (Typ), 1.5% (Max)
    • Built-in hysteresis (VIT+)
      • 1.6 V < VIT- ≤ 3.0 V = 100 mV (Typical)
      • 3.1 V ≤ VIT- < 4.9 V = 200 mV (Typical)
  • Start-up delay (tSTRT): 220 µs (Typ), 350 µs (Max)
    • Programmable reset time delay (tD):
      • 50 µs (no capacitor) to 6.2 s (10-µF)
    • 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°C to +125°C
    • Package: SOT23-5 (DBV)

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Parametrics

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Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Operating temperature range (C) Watchdog timer WDI (sec)
TPS3840 Order now Trimmable
2
2.5
2.7
2.8
2.9
3    
1     10     1.5     Active-high
Active-low
Open-drain
Push-pull    
Programmable     Manual reset     -40 to 125     None    
LM8365 Order now 2.7
4.5    
1     6     1     Active-low
Open-drain    
Programmable       -40 to 85     None    
TPS3808 Order now Adjustable
0.84
1.12
1.16
1.4
1.67
1.77
2.33
2.79
3.07
4.65    
1     6.5     1.8     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
-40 to 125     None    
TPS3890 Order now Adjustable
1.15
1.44
1.73
2.4
2.89
3.17    
1     5.5     1.5     Active-low
Open-drain    
Programmable     Active-low enable
Manual reset    
-40 to 125     None