1 Features
• Robust integrated isolation barrier:
– Withstand isolation voltage: 3000VRMS
– Isolation working voltage: 500VRMS
• Isolation barrier life: > 50 years
• Temperature sensor accuracy
– ±0.5°C typical at 25°C
– ±1.2°C maximum from 0°C to 70°C
– ±2.5°C maximum from –40°C to 150°C
• Operating supply range: 2.3V to 5.5V
• Positive slope sensor gain: 10mV/°C, with 500mV
offset at 0°C
• Fast thermal response: < 2 seconds
• Short circuit protected output
• Low power consumption: 9μA (typical)
• DFQ (SOIC-7) package
• Safety-related certifications (planned):
– 3kVRMS isolation for 1 minute per UL 1577

2 Applications
• AC charging (pile) station
• DC fast charging station
• Rack & server PSU with 48V output
• Server PSU with 12V output
• Merchant DC/DC
• Merchant telecom rectifier
• Battery backup unit
• Merchant DIN rail power supply
• AC/DC adapter PSU

3 Description
The ISOTMP35 is the industry’s first isolated
temperature sensor IC, combining an integrated
isolation barrier, up to 3000VRMS withstand voltage,
with an analog temperature sensor featuring a
10mV/°C slope from –40°C to 150°C. This integration
enables the sensor to be co-located with high voltage
heat sources (for example: HV FETs, IGBTs, or
HV contactors) without requiring expensive isolation
circuitry. The direct contact with the high-voltage heat
source also provides greater accuracy and faster
thermal response compared with approaches where
the sensor is placed further away to meet isolation
requirements.
Operating from a non-isolated 2.3V to 5.5V
supply, the ISOTMP35 allows easy integration
into applications where sub-regulated power is not
available on the high-voltage plane.
The integrated isolation barrier satisfies UL 1577
requirements. The surface mount package (7-pin
SOIC) provides excellent heat flow from the heat
source to the embedded thermal sensor, minimizing
thermal mass and providing more accurate heatsource
measurement. This reduces the need for timeconsuming
thermal modeling and improves system
design margin by reducing mechanical variations due
to manufacturing and assembly.
The ISOTMP35 class-AB output driver provides a
strong 500μA maximum output to drive capacitive
loads up to 1000pF and is designed to directly
interface with analog-to-digital converter (ADC)
sample and hold inputs.