BQ24298_15 Datasheet, PDF (37/51 Pages) Texas Instruments – bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG

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9 Application and Implementation
bq24298
SLUSC59 – APRIL 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
A typical application consists of the device configured as an I²C controlled power path management device and a
single cell Li-Ion battery charger for single cell Li-Ion and Li-polymer batteries used in a wide range of tablets and
other portable devices. It integrates an input reverse-blocking FET (RBFET, Q1), high-side switching FET
(HSFET, Q2), low-side switching FET (LSFET, Q3), and BATFET (Q4) between the system and battery. The
device also integrates a bootstrap diode for the high-side gate drive.
9.2 Typical Application
5V USB
SDP/DCP
bq24298
1μF
8.2μF
VBUS
PMID
317W (1.5A max)
ILIM
SYS
SW
BOOT
REGN
PGND
1μH
47nF
4.7μF
SYS: 3.5V-4.35V
10μF 10μF
VREF
2.2kW
SYS
PG
STAT
BAT
10kW 10kW 10kW
SDA
QON
10μF
4.2V
Host
SCL
REGN
INT
OTG
5.25kW
CE
TS
PHY
PSEL
Thermal Pad
31.23kW
10kW
Charge Enable (0°C - 45°C)
Figure 38. bq24298 with PSEL from PHY, Charging from SDP/DCP, and Optional BATFET Enable
Interface
9.2.1 Design Requirements
Table 17. Design Requirements
DESIGN PARAMATER
Input voltage range
Input current limit
Fast charge current
Boost mode output current
EXAMPLE VALUE
3.9 V to 6.2 V
3000 mA
3000 mA
1.5 A
Copyright © 2015, Texas Instruments Incorporated
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