TPS61222-EP

SLVSBI2 – SEPTEMBER 2012

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Undervoltage Lockout

An implemented undervoltage lockout function stops the operation of the converter if the input voltage drops

below the typical undervoltage lockout threshold. This function is implemented in order to prevent malfunctioning

of the converter.

Overvoltage Protection

If, for any reason, the output voltage is not fed back properly to the input of the voltage amplifier, control of the

output voltage will not work anymore. Therefore an overvoltage protection is implemented to avoid the output

voltage exceeding critical values for the device and possibly for the system it is supplying. For this protection the

TPS61222 output voltage is also monitored internally. In case it reaches the internally programmed threshold of

6.5 V typically the voltage amplifier regulates the output voltage to this value.

If the TPS61222 is used to drive LEDs, this feature protects the circuit if the LED fails.

Overtemperature Protection

The device has a built-in temperature sensor which monitors the internal IC junction temperature. If the

temperature exceeds the programmed threshold (see electrical characteristics table), the device stops operating.

As soon as the IC temperature has decreased below the programmed threshold, it starts operating again. To

prevent unstable operation close to the region of overtemperature threshold, a built-in hysteresis is implemented.

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