Over temperature detection solution with Thermoflagger™

Thermoflagger™ in combination with PTC thermistors helps to configure a simple over temperature detection solution.

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.

Click here for reference PTC thermistor
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Thermoflagger™ circuit example

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.

Normal state
Over temperature state (1)
Over temperature state (2)

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).

Over temperature protection solution by temperature sensor ICs / Over temperature protection solution by Thermoflagger™
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

This is a picture of eFuse Application Circuit (with Enhanced Overcurrent Protection).
eFuse Application Circuit (with Enhanced Overcurrent Protection)
This reference design provides design guide, data and other contents of eFuse IC Application Circuit (with Enhanced Overcurrent Protection) built on a small board.This circuit provides precise overcurrent shutdown by combining the eFuse IC and the ThermoflaggerTM used as an overcurrent detection device.
This is a picture of eFuse Application Circuit (with Thermal Shutdown).
eFuse Application Circuit (with Thermal Shutdown)
This reference design provides design guide, data and other contents of eFuse IC Application Circuit (with Thermal Shutdown) built on a small board. This circuit provides over temperature detection and protection by combining the eFuse IC and the ThermoflaggerTM (Over Temperature Detection IC).
Over Temperature Detection IC ThermoflaggerTM Application Circuit (TCTH021AE / Push-pull type)
This reference design provides design guide, data and other contents of Over Temperature Detection IC ThermoflaggerTM Application Circuits (TCTH021AE / Push-pull type). In combination with PTC thermistor(s), the ThermoflaggerTM can be used to detect over temperature at multiple locations within a device. Details of other application circuits of the ThermoflaggerTM are also provided.
Over Temperature Detection IC ThermoflaggerTM Application Circuit (TCTH021BE / Open-drain type)
This reference design provides design guide, data and other contents of Over Temperature Detection IC ThermoflaggerTM Application Circuit (TCTH021BE / Open-drain type). In combination with PTC thermistor(s), this ThermoflaggerTM can be used to detect over temperature at multiple locations within a device.

Lineup

Part
Number

Package

Operating range

Electrical characteristics

FLAG
Signal
output
(PTCGOOD)

Flag
signal
Latch
function

PTC
Thermistor
resistance
@25℃

Package
Name

Size
(mm)

Supply
voltage
VDD(V)

Operating
temperature
Topr(°C)

PTCO
Output
current
IPTCO(μA)

Detect
voltage
VDET(V)

Current
consumption
IDD(μA)

UVLO
Voltage
VUVLO(V)

Typ.

Typ.

Typ.

Typ.

Typ.

TCTH011AE

SOT-553
(ESV)

1.6×1.6,
t=0.55

1.7 to
5.5

-40 to
125

1.00

0.50

1.8

1.5

Push-pull

-

4.7 kΩ to
10 kΩ

TCTH012AE

✔ included

TCTH021AE

10.0

11.3

-

470 Ω to
1 kΩ

TCTH022AE

✔ included

TCTH011BE

1.00

1.8

Open drain

-

4.7 kΩ to
10 kΩ

TCTH012BE

✔ included

TCTH021BE

10.0

11.3

-

470 Ω to
1 kΩ

TCTH022BE

✔ included

TCTH0x1AE
FLAG signal output type is push-pull type (*)
TCTH0x1BE
FFLAG signal output type is open drain type (*)

*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)

Click here for reference PTC thermistor
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Applications

Sokud State Drive, Server, Tablet Device and other applications that require thermal management.

Server
Such as low power consumption and miniaturization are important in designing server. Toshiba provides information on a wide range of semiconductor products suitable for power supply units, motor driving unit, over temperature monitoring unit, etc., along with circuit configuration examples.
Tablet Device
Such as low power consumption and miniaturization are important in designing tablet device. Toshiba provides information on a wide range of semiconductor products suitable for power supply management units, sensor signal input units, display units, over temperature monitoring unit, etc., along with circuit configuration examples.
Solid State Drive
Such as low power consumption and miniaturization are important in designing solid state drive (SSD). Toshiba provides information on a wide range of semiconductor products suitable for power supply/power supply management units, surge/ESD protection circuit units, over temperature monitoring unit, etc., along with circuit configuration examples.

* 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.

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