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Revision 1.03

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AS1301

Overload Protection

When the output voltage drops significantly below battery voltage due to a very high load the AS1301 enters into an

overload protection condition. In this condition the output is connected to the input via a current limiting connection.

Once the overload is removed, the device enters soft-start period and ramps up to the nominal output voltage.

Undervoltage Lockout, UVLO

The AS1301 is equipped with undervoltage lockout functionality. If the battery voltage drops below 2.7V (typ) the

device enters the undervoltage lockout condition. The device remains in this condition until the battery voltage is high

enough to enter the soft-start period. An internal hysteresis of 100mV will prevent ringing during startup. If the input

voltage climbs back to 2.8V (typ) after such a condition, the device turns-on automatically.

Shutdown Mode

The AS1301 enters low-power shutdown mode when EN is set to logic low. In shutdown the charge-pump action is

set to a high-Z condition. So it can be forced higher voltage then the input, because the permanent monitoring of the

input- and output voltage will prevent an erroneous current form the output back to the input during shutdown.

Thermal Shutdown

The AS1301 offers thermal shutdown, which prevents eventual damage due to an over-temperature condition.

Thermal shutdown will be initiated if the junction temperature exceeds 145°C. If the temperature drops below this

value, the thermal shutdown will be released automatically and the device will resume operation.