STW4102IQT STMicroelectronics, STW4102IQT Datasheet - Page 19

• 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

STw4102
6.4
6.5
6.6
Charging from a USB port
The MAIN or USBPWR input can be used to charge from a USB 2.0 port. When using the
MAIN input, bit SEL_DC_USB (bit 5 of register REG_CHG0) must be set to 1. Charging
from a USB port is similar to charging from a wall adapter, except the fast charge current
I
Table 12.
Charging using external power devices
To support charge currents higher than 1 A from the main supply adapter, the STw4102
provides the option to use an external power device and sense resistor. This OTP option is
factory set.
The STw4102 driver is able to drive an external PNP (STT818B or equivalent) or a PMOS
plus Schottky diode (STS2DPFS20V or equivalent). The driver maximum sink current is
60 mA.
The external current sensing device is usually a 200 mΩ shunt resistor. With this resistor
value, the trickle and USB charge currents are close to the nominal values.
Charge mode summary
Table 13
Table 13.
USB
V
V
above
under
V
trickle
trickle
batt
REG_CHG0[7]
-
is set internally and depends on bits 6 and 7 of the control register REG_CHG0.
summarizes the different charge modes.
0
0
1
1
detected
MAIN
USB charge current
Charge modes
0
1
0
1
0
x
USBPWR
detected
0
1
1
x
x
x
REG_CHG0[6]
0
1
0
1
CHG_ENA
bit
0
1
1
1
1
1
SEL_DC_USB
bit
x
x
x
0
1
x
400mA (500 mA max)
60mA (100 mA max)
Charge disabled
No charge
Trickle charge from MAIN
Trickle charge from USBPWR
Fast charge from MAIN input,
current set by Rset
Fast charge from MAIN input,
current set by USB_ICHG bits
Fast charge from USBPWR input,
current set by USB_ICHG bits
I
USB
200mA
off
(typ)
Charge
Battery charger
19/34