AS1383 datasheet(9/22 Pages) AMSCO

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[v1-01] 2015-May-22

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AS1383 − Detailed Descriptions

Thermal Overload Protection

To prevent the AS1383 from short-term misuse the chip

includes a thermal overload protection. To block the normal

operation the switching of PMOS and NMOS are stopped during

the thermal protection, but the VOUT follows the VBAT. The

device is in thermal shutdown when the junction temperature

exceeds 150°C. To resume the normal operation the

temperature has to drop below 140°C.

Note(s): Continuing operation in thermal overload conditions

may damage the device and is considered bad practice.

VOUT Programming with External Resistor Divider

In adjustable VOUT variant AS1383 output voltage can be

selected with external resistor diver connected to the FB pin as

shown in Figure 3. In this case, the VOUT follows the function:

In fixed output voltage variant the VOUT is programmed

internally, and the VOUT if connected directly to FB pin.

A higher resistance of R1 and R2 will result in a lower leakage

current. Resistance between 10kΩ and 500kΩ is recommended

for R2. It is recommended to keep VIN 500mV higher than VOUT.

(EQ1)

VOUT

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

 1.25V

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