Texas Instruments

TMP390 Resistor-Programmable Temperature Switch

Texas Instruments' ultra-small, dual-channel switches are ideal for applications such as DC/AC inverters and DC/DC converters

Image of Texas Instruments' TMP390 Temperature SwitchTexas Instruments' TMP390A ultra-low power, dual-channel, resistor-programmable temperature switcher enables protection and detection of system thermal events from -50°C to +130°C. The TMP390A offers independent overtemperature (hot) and undertemperature (cold) detection. The trip temperatures (TTRIP) and thermal hysteresis (THYST) options are programmed by two E96-series (1%) standard decade value resistors on the SETA and SETB pins. Each resistor can range from 1.05 KΩ to 909 KΩ, representing one of 48 unique values.

The values of the resistor to ground on the SETA input sets the TTRIP threshold of Channel A. The value of the resistor-to-ground on the SETB input sets the TTRIP threshold of Channel B, as well as the THYST options of +5°C or +10°C for both channels preventing undesired digital output switching. The resistors accuracy has no impact on TTRIP accuracy.

To enable customer board-level manufacturing, the TMP390 supports a trip test function where the digital outputs are activated by exercising the SETA or the SETB pin.

Features
  • Resistor-programmable temperature trip points and hysteresis options:
    • Resistor tolerances contribute zero error
    • Hysteresis options: +5°C and +10°C
  • Ultra-low power consumption: 0.5 µA (typ. at +25°C)
  • Operating temperature range: -55°C to +130°C
  • Supply voltage: 1.62 V to 5.5 V
  • Accuracy level options (max at -55°C to +130°C):
    • A2 Level: ±3.0°C (±1.5°C from 0°C to +70°C)
    • A3 Level: ±3.5°C (±2.0°C from 0°C to +70°C)
  • Open-drain outputs
  • Trip test function enables in-system testing
  • Package: SOT-563 (1.60 mm x 1.20 mm) 6-pin
Applications
  • DC/AC inverters
  • DC/DC converters
  • Temperature transmitters
  • Environmental control systems (ECS)
  • Power tools
  • Power banks
  • Wireless infrastructure:
    • WLAN/Wi-Fi access points
    • Core routers
    • Edge routers
    • Macro remote radio units (RRUs)

TMP390A Temperature Switches

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
THERMOSTAT PROG ACT LOW OPEN DRNTMP390A3DRLTTHERMOSTAT PROG ACT LOW OPEN DRN22151 - Immediate$7.90View Details
THERMOSTAT PROG ACT LOW OPEN DRNTMP390A2DRLTTHERMOSTAT PROG ACT LOW OPEN DRN1480 - Immediate$8.40View Details

Evaluation Board

ImageManufacturer Part NumberDescriptionSensing RangeInterfaceVoltage - SupplyAvailable QuantityPriceView Details
DEVELOPMENT DATA ACQUISITIONTMP390EVMDEVELOPMENT DATA ACQUISITION-55°C ~ 130°C-2.2V ~ 5.5V5 - Immediate$286.47View Details
Published: 2019-07-09

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