1 Features

• Robust integrated isolation barrier:

– Withstand isolation voltage: 5kVRMS

– Isolation working voltage: 1.06kVRMS

• Isolation barrier life: >30 years

• Temperature sensor accuracy:

– ±0.5°C typical at 25°C

– ±1.5°C maximum from 0°C to 70°C

– ±2.5°C maximum from –40°C to 150°C

• Operating supply range: 3V to 34V

• Positive slope sensor gain: 10mV/°C

• Sensor offset: 500mV at 0°C

• Fast thermal response: <4s

• Short circuit protected output

• Low power consumption: 45μA (typical)

• DFP (SSOP-12) package

• Safety-related certifications (planned):

– 5kVRMS isolation for 1 minute per UL 1577

2 Applications

• AC charging (pile) station

• DC fast charging station

• Rack and 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 ISOTMP35R is the industry’s first reinforced

isolated temperature sensor IC, combining an

integrated isolation barrier, up to 5kVRMS 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 3V to 34V supply, the

ISOTMP35R allows easy integration into applications

where subregulated power is not available on the

high-voltage plane.

The best output voltage of the ISOTMP35R ranges

from 100mV to 2V for a –40°C to 150°C temperature

range. The ISOTMP35R does not require any external

calibration or trimming to provide a worst-case

accuracy of ±0.5°C at room temperature and ±2.5°C

over the full –40°C to 150°C temperature range. The

linear output, 500mV offset, and factory calibration of

the ISOTMP35R simplify the circuitry requirements in

a single supply environment where reading negative

temperatures is necessary.

The integrated isolation barrier satisfies UL 1577

requirements. The surface mount package (12-pin

SSOP) 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.