AN3050

Description

Doc ID 16207 Rev 1

5/18

2

Description

The STBP120 provides robust protection for positive input voltage up to +28 V and is

charge pump. The overvoltage thresholds currently available are 5.375 V, 5.50 V, 5.90 V and

6.02 V.

As additional protection, the STBP120 also monitors its own junction temperature and turns

off the internal MOSFET if the temperature exceeds the specified threshold.

The STBP120 is equipped with the undervoltage lockout function preventing unreliable

operation of the protected application for low input voltage.

The STBP120 device can be controlled (enabled / disabled) by the microcontroller and

provides status information (input overvoltage, input undervoltage, thermal shutdown)

to the microcontroller.

The STBP120 requires only one external component (1 µF input capacitor improving the

ESD immunity and stability under input transients conditions), other components are

optional (see Figure 2).

It is offered in a small, RoHS compliant 10-lead TDFN package of 2.5 x 2 mm dimensions.

For more details, please refer to the STBP120 datasheet available on www.st.com.

Figure 1.

STBP120 block diagram

GND

FLT

EN

IN

OUT

COUNTERS

OFF

VREF

VCC

AM00306

CONTROL LOGIC

SUPPLY

REGULATOR

OSCILLATOR

CHARGE PUMP

MOSFET DRIVER

VOLTAGE

REFERENCE

Input overvoltage

Input undervoltage

Thermal shutdown

Temperature

detector

MCU

INTERFACE

ESD

protection

ESD

protection

ESD

protection

Core

negative

protection