Overview
The TMP390A2DRLR, produced by Texas Instruments, is an ultra-low power, dual-channel, resistor-programmable temperature switch. This device is designed to detect and protect 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 thermal monitoring applications. The TMP390A2DRLR is part of the TMP390 family and is packaged in a small SOT-563 (6-pin) package, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Operating Free-Air Temperature | -55°C to 130°C | -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 |
| Conversion Time | - | - | 0.65 | - | ms |
| Output Type | - | - | - | Open-Drain Active Low | - |
Key Features
- Ultra-low power consumption, making it suitable for battery-powered devices.
- Dual-channel temperature detection for both overtemperature (hot) and undertemperature (cold) events.
- Resistor-programmable trip temperatures and hysteresis using E96-series (1%) resistors.
- Open-drain outputs with the ability to pull up to any voltage independent of VDD (VDDIO must be less than or equal to VDD + 0.3 V).
- Trip test function for board-level manufacturing testing.
- Small SOT-563 (6-pin) package for space-constrained designs.
- Operating temperature range from –50°C to 130°C.
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 TMP390A2DRLR?
The operating temperature range is from –50°C to 130°C.
- How are the trip temperatures and hysteresis programmed in the TMP390A2DRLR?
The trip temperatures and hysteresis are programmed using two external E96-series (1%) resistors connected to the SETA and SETB pins.
- What type of output does the TMP390A2DRLR have?
The output is open-drain active low.
- What is the recommended pullup resistor value for the outputs?
The pullup resistors should be greater than 1 kΩ to minimize internal power dissipation.
- Can the TMP390A2DRLR be used in one-channel mode?
- What is the purpose of the trip test function in the TMP390A2DRLR?
The trip test function allows for board-level manufacturing testing by forcing the SETA or SETB pins to logic high to activate the digital outputs.
- What is the typical conversion time for the TMP390A2DRLR?
The typical conversion time is 0.65 ms.
- Can the outputs of multiple TMP390A2DRLR devices be connected together?
- What is the recommended power supply bypassing capacitor value?
A 0.1-µF capacitor is recommended to be placed close to the VDD supply pin.
- What is the junction-to-ambient thermal resistance of the TMP390A2DRLR?
The junction-to-ambient thermal resistance (RθJA) is 230 °C/W.
