STW4102IQT STMicroelectronics, STW4102IQT Datasheet - Page 16

• Manufacturer Part Number: STW4102IQT
• Description: IC LI-ION BATT CHRGR DUAL 24QFN
• Manufacturer: STMicroelectronics

Specifications of STW4102IQT

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.25 V ~ 16 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Product: Charge Management
• Output Voltage: 4.7 V
• Output Current: 100 mA to 1000 mA
• Operating Supply Voltage: 4.25 V to 16 V
• Supply Current: 2 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• For Use With: 497-8514 - BOARD EVAL STW4102/STM32497-8338 - BOARD EVAL BASED ON STW4102
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6840-2

Application schematics
5.3
16/34
Using LDO regulator to supply telephone from wall adapter
The regulator with external power PMOS (M1) supplies the telephone while the battery is
discharged or unplugged. When the charger is unplugged, the phone is supplied by the
battery through Power MOS M2. A Schottky diode (D1) avoids reverse current.
Figure 18. Charge power path and regulator
Table 10.
M1 + D1
Name
M2
Co
C4
To phone
Component list for LDO regulator
STS2DPFS20V
M1
10µF to 22µF
STT5PF20V
management
D1
Typ. value
to power
Co >= 15uF
Co
C4
Indicator LED
Reset
Battery voltage
IO voltage
C2
M2
SCL
SDA
USBPWR
RESETN
LDODRV
LDOFB
VIO
EOCHG
MAIN
PWRDETECTN
CVREF
Tolerance
DRIVER
PMOS transistor with Schottky diode
PMOS transistor
An output capacitor Co of at least 10µF is required.
An input capacitor C4 equal to or larger than Co is
required on MAIN input.
STw4102
GND
TEST
BATTSENSE
C32KHZ
STDBY
SENSE
VOUT
Comments
BATT
ICG+
ICG-
CVIS
ISET
32kHz
StandBy
Rset
C1
C3
Rcg
STw4102