STBP120 STMicroelectronics, STBP120 Datasheet - Page 9

• Manufacturer Part Number: STBP120
• Description: Overvoltage protection device with thermal shutdown
• Manufacturer: STMicroelectronics

STBP120
Figure 3.
Figure 4.
1. Optional resistors R
2. The STBP120 MOSFET switch topology allows the current to also flow in the reverse direction, from OUT to IN, which can
IN
required. Low ESR ceramic capacitor C1 is necessary to ensure proper function of the STBP120. Capacitor C2 is not
necessary for STBP120 but may be required by the charger IC.
be useful for powering external peripherals from the system connector. The charger IC should not contain the reverse
diode to prevent the battery pack voltage from appearing on the system connector. If the reverse current (supply current) is
undesirable, it may be prevented by connecting a Schottky diode in series with the OUT pin. The voltage drop between IN
and charger is increased by the voltage drop across the diode.
protection
ESD
PERIPHERALS
Block diagram
Typical application circuit
POWERED
AC
adapter
EN
Temperature
protection
negative
, R
detector
Core
CONNECTOR
V REF
FLT
prevent damage to the controller under extreme voltage or current conditions and are not
SYSTEM
OR
Input undervoltage
Thermal shutdown
Input overvoltage
REGULATOR
REFERENCE
VOLTAGE
SUPPLY
V CC
(1)
C1
1 µF
,
Doc ID 15492 Rev 5
(2)
CHARGING CURRENT
SUPPLY CURRENT
PERIPHERAL
IN
STBP120
CONTROL LOGIC
GND
OSCILLATOR
COUNTERS
OUT
FLT
EN
GND
C2
1 µF
R FLT
R EN
CHARGER
DC-DC
MOSFET DRIVER
IC
ENABLE
CHARGE PUMP
EN
INTERFACE
MCU
BATTERY
PACK
protection
R PU
ESD
OFF
CONTROLLER
Pin descriptions
CIRCUITS
APPLICATION
SUPPLY
protection
ESD
AM00314a
AM00306
OUT
9/36
FLT
EN