Overview
The TPS3840PL45DBVR from Texas Instruments is a nano power, high input voltage supervisor integrated circuit. This device is designed to monitor the supply voltage and provide a reset signal when the voltage falls below a predetermined threshold. It features a wide operating voltage range from 1.5 V to 10 V, making it versatile for various applications. The TPS3840PL45DBVR is particularly notable for its ultra-low supply current, typically 300 nA, which is beneficial for power-sensitive designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD Input Supply Voltage | 1.5 | 10 | V | |
| IDD Supply Current into VDD pin | 300 | 700 | nA | |
| VIT- Negative-going Input Threshold Voltage | 1.6 | 4.9 | V | |
| VHYS Hysteresis on VIT- pin | 75 | 100 | 125 | mV (for VIT- = 1.6 V to 3.0 V) |
| VHYS Hysteresis on VIT- pin | 175 | 200 | 225 | mV (for VIT- = 3.1 V to 4.9 V) |
| tSTRT Start-up Delay | 220 | 350 | µs | |
| tD Programmable Reset Time Delay | 50 µs (no capacitor) | 6.2 s (10-µF capacitor) | s | |
| VMR_L Manual Reset Logic Low Input | 600 | mV | ||
| VMR_H Manual Reset Logic High Input | 0.7VDD | V | ||
| Temperature Range | -40 | 125 | °C | |
| Package | SOT-23 (5-pin) |
Key Features
- Wide Operating Voltage Range: 1.5 V to 10 V
- Nano Power Consumption: Typical supply current of 300 nA, maximum of 700 nA
- Fixed Threshold Voltage: From 1.6 V to 4.9 V in 0.1-V steps with high accuracy (1% typical, 1.5% maximum)
- Built-in Hysteresis: 100 mV for VIT- = 1.6 V to 3.0 V, 200 mV for VIT- = 3.1 V to 4.9 V
- Programmable Reset Time Delay: From 50 µs (no capacitor) to 6.2 s (10-µF capacitor)
- Manual Reset: Active-low manual reset (MR) pin
- Output Topologies: Push-pull active-low (TPS3840PL), push-pull active-high (TPS3840PH), and open-drain active-low (TPS3840DL)
- Wide Temperature Range: -40°C to +125°C
- Glitch Immunity Protection: Built-in protection for MR and VDD pins
Applications
- Grid Infrastructure: Circuit breakers, smart meters, monitoring and protection equipment
- Factory Automation: Field transmitters, PLCs (Programmable Logic Controllers)
- Building Automation: Fire safety systems, smoke detectors, HVAC systems
- Electronic Point of Sale: POS terminals and other payment systems
- Portable Devices: Battery-powered devices requiring low power consumption
Q & A
- What is the typical supply current of the TPS3840?
The typical supply current is 300 nA, with a maximum of 700 nA.
- What is the operating voltage range of the TPS3840?
The operating voltage range is from 1.5 V to 10 V.
- What are the available output topologies for the TPS3840?
The available output topologies are push-pull active-low (TPS3840PL), push-pull active-high (TPS3840PH), and open-drain active-low (TPS3840DL).
- How is the reset time delay programmed in the TPS3840?
The reset time delay can be programmed using an external capacitor connected to the CT pin, ranging from 50 µs (no capacitor) to 6.2 s (10-µF capacitor).
- What is the temperature range of the TPS3840?
The temperature range is from -40°C to +125°C.
- Does the TPS3840 have built-in hysteresis?
Yes, the TPS3840 has built-in hysteresis, with values of 100 mV for VIT- = 1.6 V to 3.0 V and 200 mV for VIT- = 3.1 V to 4.9 V.
- What is the purpose of the MR pin in the TPS3840?
The MR pin is used for manual reset, allowing the user to assert a reset signal by pulling the pin to a logic low.
- Can the CT pin be left floating if not used?
Yes, the CT pin can be left floating if no external capacitor is used for programming the reset time delay.
- What are some common applications of the TPS3840?
Common applications include grid infrastructure, factory automation, building automation, electronic point of sale, and portable devices.
- What package type is the TPS3840 available in?
The TPS3840 is available in a 5-pin SOT-23 package.
