STBP112

Pin description

Doc ID 023357 Rev 3

7/38

2

Pin description

2.1

Input (IN)

Input voltage (IN) pin. The IN pin is connected to the DC power supply. An external low ESR

ceramic capacitor of minimum value 1 µF must be connected between IN and GND. This

capacitor is needed for decoupling and also protects the IC against fast voltage spikes and

ESD events. This capacitor should be located as close to the IN pin as possible.

2.2

Output (OUT)

N-channel MOSFET switch.

If no fault is detected and the STBP112 is enabled by the EN input, this switch is turned on

and the output voltage follows the input voltage.

The output is disconnected from the input when the input voltage is under the UVLO

threshold or above the OVLO threshold, when the junction temperature is above the thermal

shutdown threshold or when the device is disabled by the EN input.

After the input voltage or junction temperature returns to the specified range, there is

page 13).

The switch turn-on time is intentionally prolonged to limit the inrush current and voltage drop

caused, for example, by charging output capacitors (soft-start feature).

2.3

Fault indication output (FLT)

The active low, open-drain fault indication output provides information on the STBP112 state

to the application controller. The FLT is asserted (i.e. driven low), if the STBP112 is in the

overvoltage condition or thermal shutdown mode is active.

to the controller supply voltage (see Figure 4). If there is no need to use this output, it may

To improve safety and to prevent damage to application circuits in the event of extreme

the range of 10 k

Ω to 100 kΩ.

The FLT output is in Hi-Z (high impedance) state when the device is disabled by EN input or

when the input voltage is lower than the UVLO threshold.

2.4

Enable input (EN)

This active low logical input can be used to enable or disable the device. When the EN input

is driven high, the STBP112 is in shutdown mode and the power output is disconnected

from the input (see Figure 8 on page 13). When the EN input is driven low and all operating

conditions are within specified limits, the power output is connected to the input.