BQ25890H Datasheet, PDF (52/66 Pages) Texas Instruments – I2C Controlled Single Cell 5-A Fast Charger

BQ25890H
SLUSCC5 – SEPTEMBER 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
Input
3.9V±14V at 3A
OTG
5V at 2.4A
VBUS
1F
C1
PMID
1H
SW
SYS 3.5V±4.5V
USB
Optional
47nF
DSEL
D+
BTST
REGN
47nF
4.7 F
10 F 10 F
Host
VREF
10<Q
10<Q
260Q
SYS
2.2<Q
10<Q
D-
ILIM
STAT
PGND
SYS
BAT
QON
1F
Ichg = 5A
10 F
SDA
SCL
INT
OTG
TS
/CE
bq25890H
REGN
5.23<Q
30.1<Q
Optional
10<Q
Recommended C1 = 8.2 μF (OTG ≤ 1.8 A) or 20 μF (OTG ≤ 2.4 A)
Figure 47. bq25890 with D+/D- Interface and USB On-The-Go (OTG)
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
52
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