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| BQ24157S Datasheet, PDF (29/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support | |||
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Not Recommended for New Designs
www.ti.com
9 Application and Implementation
bq24157S
SLUSB76B â FEBRUARY 2013 â REVISED MAY 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. TIâs 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
The bq24157S is a compact, flexible, high-efficiency, USB-friendly, switch-mode charge management solution for
single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The bq24157S integrates
a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage
regulation, and charge termination, into a small DSBGA package. The charge parameters can be programmed
through an I2C interface.
9.2 Typical Application
VBUS = 5 V, ICHARGE = 1250 mA, VBAT = 3.5 to 4.44 V (adjustable).
VBUS
CIN
1 mF
VBUS
SW
U1
bq24157S
VAUX
CIN 4.7 mF PMID
10 kW
10 kW 10 kW
SCL
SDA
STAT
10 kW
I2C BUS
SLRST
10 kW
HOST
CD
10 kW
SCL
SDA
STAT
SLRST
CD
BOOT
PGND
CSIN
CSOUT
VREF
LO 1 mH
RSNS
CBOOT
33 nF
CCSIN
0.1 mF
CVREF
1 mF
CCSOUT
0.1 mF
CO1
22 mF
VBAT
CO2
33 mF
PACK+
+
PACKâ
Figure 28. I2C Controlled 1-Cell USB Charger Application Circuit With USB-OTG Support
9.2.1 Design Requirements
Use the following typical application design procedure to select external components values for the bq24157S
device.
Specification
Test Condition
Input DC voltage, VIN
Input voltage from AC adapter input
Input current
Maximum input current from AC adapter input
Charge current
Battery charge current
Output regulation voltage
Voltage applied at VBAT
Operating junction temperature range, TJ
MIN
4
0.1
0.325
0
0
TYP
5
0.1 to 0.5
0.7
3 to 4.2
MAX
6
1.5
1.55
4.44
125
UNIT
V
A
A
V
°C
Copyright © 2013â2015, Texas Instruments Incorporated
Product Folder Links: bq24157S
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