TPS3840 Datasheet | Texas Instruments

Features - 1 Wide operating voltage: 1.5 V to 10 V - Nano supply current: 300 n A (Typ), 700 n A (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 m V (Typical) - 3.1 V ≤ VIT- < 4.9 V = 200 m V (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) 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 ponents 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 (t D) expires. Reset time delay can be programmed by connecting a capacitor between CT pin and...