TPS3840 Texas instruments

TPS3840

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TPS3840

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Описание

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)).

Wide operating voltage: 1.5 V to 10 V
Nano supply current: 300 nA (Typ), 700 nA (Max)
Fixed threshold voltage (V_IT-)
- Threshold from 1.6 V to 4.9 V in 0.1-V steps
- High accuracy: 1% (Typ), 1.5% (Max)
- Built-in hysteresis (V_IT+)
  - 1.6 V < V_IT- ≤ 3.0 V = 100 mV (Typical)
  - 3.1 V ≤ V_IT- < 4.9 V = 200 mV (Typical)
Start-up delay (t_STRT): 220 µs (Typ), 350 µs (Max)
Programmable reset time delay (t_D):
- 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)

Number of supplies monitored	1
Threshold voltage 1 (typ) (V)	1.6, 1.7, 1.8, 1.9, 2, 2.2, 2.4, 2.5, 2.7, 2.8, 2.9, 3, 3.1, 3.5, 4, 4.2, 4.3, 4.4, 4.5, 4.6, 4.8, 4.9, Trimmable
Features	Manual reset capable
Reset threshold accuracy (%)	1.5
Iq (typ) (mA)	0.0003
Output driver type/reset output	Active-high, Active-low, Open-drain, Push-Pull
Time delay (ms)	0
Supply voltage (min) (V)	1.5
Supply voltage (max) (V)	10
Rating	Catalog
Watchdog timer WDI (s)	None
Monitored voltage 1 (nom) (V)	2.5, 3, 3.3, 5, Adjustable
Operating temperature range (°C)	-40 to 125