Overview
The TMP390A3DRLR, produced by Texas Instruments, is an ultra-low power, dual-channel, resistor-programmable temperature switch. This device is designed to detect and protect against system thermal events over a wide temperature range of –50°C to 130°C. It offers independent overtemperature (hot) and undertemperature (cold) detection, making it versatile for various applications. The trip temperatures and hysteresis options are programmed using two external E96-series resistors connected to the SETA and SETB pins.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Free-Air Temperature | –55 | 130 | °C | ||
| Supply Voltage (VDD) | 1.62 | 5.5 | V | ||
| Trip Point Accuracy (0°C to 70°C, VDD = 2.5V to 5.5V) | –1.5 | ±0.5 | 1.5 | °C | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 230 | °C/W | |||
| Power Supply Current | VDD = 3.3V | 0.5 | μA |
Key Features
- Ultra-low power consumption of 0.5 μA typical at VDD = 3.3V.
- Dual-channel temperature detection for independent overtemperature (hot) and undertemperature (cold) protection.
- Resistor-programmable trip temperatures and hysteresis using E96-series resistors.
- Open-drain outputs with optional pullup resistors for flexibility in voltage levels.
- Wide operating temperature range from –50°C to 130°C.
- Low supply voltage range from 1.62V to 5.5V.
- Small 6-pin SOT-563 package for compact designs.
- Support for board-level manufacturing test through the trip test function.
Applications
- Environmental control systems (ECS).
- Power tools.
- Power banks.
- Wireless infrastructure:
- WLAN/Wi-Fi access points.
- Core routers.
- Edge routers.
- Macro remote radio units (RRU).
Q & A
- What is the operating temperature range of the TMP390?
The TMP390 operates over a temperature range of –50°C to 130°C.
- How are the trip temperatures and hysteresis programmed in the TMP390?
The trip temperatures and hysteresis are programmed using two external E96-series resistors connected to the SETA and SETB pins.
- What is the typical power consumption of the TMP390?
The typical power consumption is 0.5 μA at VDD = 3.3V.
- What is the supply voltage range for the TMP390?
The supply voltage range is from 1.62V to 5.5V.
- Can the outputs of the TMP390 be connected together?
- What type of outputs does the TMP390 have?
The TMP390 has open-drain outputs that require pullup resistors.
- What is the purpose of the trip test function in the TMP390?
The trip test function allows for board-level manufacturing tests by forcing the SETA or SETB pins to logic high to activate the digital outputs.
- How often does the TMP390 update its output?
The device updates its output every half a second.
- What is the recommended value for the pullup resistors?
The pullup resistors should be greater than 1 kΩ to minimize internal power dissipation.
- Can the TMP390 be used in one-channel mode?
