Datasheet

STBP120 Pin descriptions
Doc ID 15492 Rev 5 9/36
Figure 3. Block diagram
Figure 4. Typical application circuit
(1)
,
(2)
1. Optional resistors R
EN
, R
FLT
prevent damage to the controller under extreme voltage or current conditions and are not
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.
2. The STBP120 MOSFET switch topology allows the current to also flow in the reverse direction, from OUT to IN, which can
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.
GND
FLT
EN
IN
OUT
COUNTERS
OFF
V
REF
V
CC
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
AM00314a
AC
adapter
POWERED
PERIPHERALS
SYSTEM
CONNECTOR
SUPPLY CURRENT
CHARGING CURRENT
C1
1 µF
IN OUT
FLT
EN
GND
EN
ENABLE
C2
1 µF
R
FLT
R
EN
R
PU
CHARGER
IC
SUPPLY
CIRCUITS
CONTROLLER
BATTERY
PACK
STBP120
APPLICATION
DC-DC
OR
PERIPHERAL