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Programmable Temperature Controlled MOSFET Driver

ISL25700

The Temperature Controlled MOSFET Driver is a highly

integrated solution that combines a MOSFET driver with

overcurrent protection and two 8-bit resolution DACs on

a monolithic CMOS integrated circuit (IC).

The ISL25700 sets up and monitors temperature at the

point of interest, compares it with the user programmable

setpoint, and adjusts the output until the set temperature is

reached. An external power MOSFET, a heater, an NTC

thermistor and the ISL25700 are parts of the temperature

control loop.

It also features programmable overcurrent protection of

the MOSFET. The current protection automatically adjusts

the output voltage in order to keep MOSFET power under

user defined limits. The protection settings always

override the temperature settings that cause violation of

the current limit.

There is an additional 8-bit General Purpose DAC that is

available for application specific use.

The ISL25700 can be used in a variety of applications

where constant temperature is a key parameter.

Applications*(see page 17)

• Oven Controlled Applications with Micro Temperature

Chamber in:

- Basestations

- Spectrometers

- Precision Meters

- Precision Generators

Features

• Setpoint Temperature Range from +40°C to +110°C

• Operational Temperature Range from -40°C to +125°C

• 3°C Initial Setpoint Accuracy

• Coarse and Fine Tuning Setpoint Control

- +15°C Coarse Adjustment

- +0.1°C Fine Adjustment

• ±0.5°C Long-term Drift Error

• Programmable Current Protection of External MOSFET

• 5-bit Selectable Gain Control

• Wide Power Supply Range: 3V to 15V

• Works with 20kΩ to 200kΩ External NTC Thermistor

• General Purpose 8-bit DAC - 0.4% Output Resolution

• High Reliability

- Endurance: 10,000 Data Changes per Bit per Register

- Register Data Retention: 10 years @ T ≤ +125°C

• 10 Lead μTQFN 2.1mmx1.6mm Package

• Pb-free (RoHS Compliant)

FIGURE 1. TYPICAL TEMPERATURE SETTLING TIME

100

80

60

40

20

0

03

69

12

15

TIME (MINUTES)

September 3, 2010

FN6885.0