BQ25895_16 Datasheet, PDF (50/67 Pages) Texas Instruments – Adjustable Voltage 3.1-A Boost Operation

bq25895
SLUSC88A – MARCH 2015 – REVISED MAY 2016
9 Application and Implementation
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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 battery charger for Li-Ion and Li-polymer batteries used in a wide range of smartphones and other
portable devices. It integrates an input reverse-block 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 at 2.4A OTG
Phone
Input
3.9V±14V at 3A
40 F
1F
USB
PMID
VBUS
D+
SW
BTST
REGN
2.2 H
47nF
4.7 F
SYS 3.5V±4.5V
10 F 10 F
Host
VREF
10<Q 10<Q
260Q
SYS
2.2<Q
10<Q
D-
ILIM
STAT
PGND
SYS
BAT
QON
Ichg=5A
10uF
SDA
SCL
INT
OTG
TS
/CE
bq25895
REGN
5.23<Q
30.1<Q
Optional
10<Q
Figure 47. bq25895 with D+/D- Interface and 2.4 A Boost Mode Output
9.2.1 Design Requirements
For this design example, use the parameters shown in Table 29.
PARAMETERS
Input voltage range
Input current limit
Fast charge current
Output voltage
Table 29. Design Parameter
VALUES
3.9 V to 14 V
1.5 A
5000 mA
4.352 V
50
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