Over temperature detection solution with Thermoflagger™
What is Thermoflagger™？
Thermal management is important to ensure optimal performance and protect electronic devices from thermal damage.
Toshiba's Thermoflagger™ over-temperature detection ICs offer an over temperature protection solution in combination with PTC thermistors or temperature sensor ICs.
Thermoflagger™ operation
The resistance of PTC thermistors rises with temperature. When several PTC thermistors are connected in series with a constant current source inside the Thermoflagger™, the Thermoflagger™ can detect the PTC thermistor voltage using an internal comparator and constant current source. In case of an over temperature condition the resistor value of the PTC thermistors(s) rises and terminal voltage at the comparator rises. The Thermoflagger™ detects this as the result of a temperature change beyond the temperature set as the normal state.
Comparison with temperature sensor IC
General temperature sensor ICs can measure temperature at a specific point, however it is necessary to place an IC at each point where the temperature is to be measured.
Toshiba's Thermoflagger™ solution can detect several points using external PTC thermistors. A more robust over temperature protection solution can be realized by combining Toshiba's Thermoflagger™ with general temperature sensor IC(s).
| Product | General temperature sensor ICs | Toshiba Thermoflagger™ |
|---|---|---|
| Temperature sensors | Integrated | External PTC thermistor(s) |
| Temperature setting | I2C (example) | Select PTC thermistor(s) |
| Detect points | One point for one IC Several points for several ICs |
Several points for one IC |
Note: Examples of typical competitor product specifications
Reference Design
Lineup
Part |
Package |
Operating range |
Electrical characteristics |
FLAG |
Flag |
PTC |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Package |
Size |
Supply |
Operating |
PTCO |
Detect |
Current |
UVLO |
||||
Typ. |
Typ. |
Typ. |
Typ. |
Typ. |
|||||||
SOT-553 |
1.6×1.6, |
1.7 to |
-40 to |
1.00 |
0.50 |
1.8 |
1.5 |
Push-pull |
- |
4.7 kΩ to |
|
✔ included |
|||||||||||
10.0 |
11.3 |
- |
470 Ω to |
||||||||
✔ included |
|||||||||||
1.00 |
1.8 |
Open drain |
- |
4.7 kΩ to |
|||||||
✔ included |
|||||||||||
10.0 |
11.3 |
- |
470 Ω to |
||||||||
✔ included |
|||||||||||
＊The voltage of the push-pull type FLAG signal outputs the power supply voltage as it is. This eliminates the need for pull-up power supplies and resistors.
The open drain type requires a pull-up power supply and resistor, but the FLAG signal voltage can be set arbitrarily.
Thermoflagger™ (Over temperature detection IC)
Applications
Sokud State Drive, Server, Tablet Device and other applications that require thermal management.
* Thermoflagger™ is a trademark of Toshiba Electronic Devices & Storage Corporation.
* Other company names, product names, and service names may be trademarks of their respective companies.