STBP110 datasheet(7/40 Pages) STMICROELECTRONICS

7 / 40 page

STBP110

Pin description

Doc ID 018687 Rev 3

7/40

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)

Output voltage (OUT) pin. The OUT pin is connected to the input through a low RDS(on)

N-channel MOSFET switch.

If no fault is detected and the STBP110 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

a recovery delay, trec, and the power output is then connected to the input (see Figure 8).

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 STBP110 state

to the application controller. The FLT is asserted (i.e. driven low), if the STBP110 is in the

overvoltage condition or thermal shutdown mode is active.

As the FLT output is of the open-drain type, it may be pulled up by an external resistor RPU

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

be left disconnected. The suitable RPU resistor value is in the range of 10 kΩ to 1 MΩ.

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

voltage or current conditions, an optional protective resistor RFLT can be connected between

the FLT output and the controller input (see Figure 4). The suitable RFLT resistor value is in

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 STBP110 is in shutdown mode and the power output is disconnected

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

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

STBP110 数据表(PDF) 7 Page - STMicroelectronics

STBP110 数据表(HTML) 7 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

数据表下载