STBP110 Datasheet, PDF (8/40 Pages) STMicroelectronics – Overvoltage protection device

Pin description
STBP110
The EN input is equipped with an internal pull-down resistor of 250 kΩ (typical value). If
there is no need to use this input, it may be left floating or, preferably, connected to GND.
For V_IN lower than 2.5 V (max.), the pull-down resistor is internally disconnected to lower the
EN pin input current in case the external AC adapter is not connected, the application is
running from an internal battery and the STBP110 device is disabled.
To improve safety and to prevent damage to application circuits in the event of extreme
voltage or current conditions, an optional protective resistor R_EN can be connected between
the EN input and the controller output (see Figure 4). The protective resistor forms a voltage
divider with the internal pull-down resistor, which limits the maximum possible R_EN value
with respect to the V_IH(EN) threshold of EN input and the controller’s output voltage for logic
high, V_OH. For the worst case, the highest protective resistor value is
R_ENmax = R_PD(EN)min x (V_OH / V_IH(EN) - 1),
where R_PD(EN)min is 100 kΩ and V_IH(EN) is 1.2 V.
For most cases, an R_EN value of 10 kΩ to 100 kΩ is adequate.
The FLT output is in Hi-Z state when the device is disabled by EN input.
2.5
No connect (NC)
Pin 3, 6, and 7 are no connect (NC). They may be left floating or connected to GND.
2.6
Ground (GND)
Ground terminal. All voltages are referenced to GND. The exposed thermal pad is internally
connected to GND.
Table 1. Pin description and signal names
Pin
Name
Type
Function
1
IN
Input/supply
Input voltage
2
GND
Supply
Ground
3, 6, 7
NC
-
Not connected
4
FLT
Output
Fault indication output (open-drain)
5
EN
Input
Enable input (pull-down resistor to GND)
8
OUT
Output
Output voltage
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Doc ID 018687 Rev 3