1 Features
• Resistor programmable temperature trip points
and hysteresis options
– Resistor tolerances contribute zero error
– Hysteresis options: 5°C, 10°C and 20°C
• Separate outputs for overtemperature or
undertemperature detection
– Channel A (overtemperature): +30 to +124°C,
2°C steps
– Channel B (undertemperature): –50 to +25°C,
5°C steps
• Accuracy level options (maximum 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)
• Ultra-low power consumption: 0.5 μA typical at
25°C
• Supply voltage: 1.62 to 5.5 V
• Open-drain outputs
• Trip test function enables in-system testing
• Available in a SOT-563 (1.60-mm × 1.20-mm),
6-pin package

2 Applications
• DC/AC inverter
• DC/DC converter
• 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 (RRU)

3 Description
The TMP390 device is part of a family of ultralow
power, dual channel, resistor programmable
temperature switches that enable protection and
detection of system thermal events from –50°C
to 130°C. The TMP390 offers independent
overtemperature (hot) and undertemperature (cold)
detection . The trip temperatures (TTRIP) and thermal
hysteresis (THYST) options are programmed by two
E96-series resistors (1% tolerance) on the SETA and
SETB pins. Channel A resistors can range from 1.05
KΩ to 909 KΩ, representing one of 48 unique values.
Channel B resistors can range from 10.5 KΩ to 909
KΩ
The value of the resistor to ground on SETA input
sets the TTRIP threshold of Channel A. The value
of the resistor to ground on SETB input sets the
TTRIP threshold of Channel B, as well as the THYST
options of 5°C, or 10°C for both channels, to prevent
undesired digital output switching. When the SETB
input is connected to ground, Channel A operates with
20°C hysteresis. Resistors accuracy has no impact to
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 SETB
pin.