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| BQ24161B_15 Datasheet, PDF (35/52 Pages) Texas Instruments – bq2416xx 2.5A, Dual-Input, Single-Cell Switched-Mode Li-Ion Battery Charger with Power Path Management and I2C Interface | |||
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Typical Application (continued)
bq24160, bq24160A, bq24161
bq24161B, bq24163, bq24168
SLUSAO0F â NOVEMBER 2011 â REVISED JULY 2014
ADAPTER
VBUS
D+
D-
GND
1 mF 4.7 mF
1 mF 4.7 mF
1 mF
USB PHY
IN
PMIDI
USB
PMIDU
DRV
SW
BOOT
SYS
PGND
BGATE
BAT
STAT
TS
PSEL
bq24161
INT
SDA
SCL
1.5 mH
0.01 mF
10 mF
VDRV
1 mF
TEMP
PACK+
PACK-
System
Load
GSM
PA
VSYS
(1.8V)
HOST
GPIO1
SDA
SCL
Figure 22. bq24161, Shown with External Discharge FET, PA Connected to System for GSM Call Support
with a Deeply Discharged or No Battery
10.2.1 Design Requirements
Supply voltage, VIN
USB voltage, VUSB
System voltage, VSYS
Battery voltage, VBAT
Input voltage from ac adapter
Input voltage from USB or equivalent supply
Voltage output at SYS terminal (depends on VBAT voltage and
status of VINDPM)
Voltage output at VBAT terminal (registers set via I2C
communication)
Supply current, IIN(MAX)
Maximum input current from ac adapter input (registers set via
I2C communication)
Supply current, IUSB(MAX)
Maximum input current from USB input (registers set via I2C
communication)
Fast charge current,
ICHRG(MAX)
Battery charge current (registers set via I2C communication)
Operating junction temperature range, TJ
Min
4.2
4.2
3.3
2
1.5
0.1
0.550
-40
Typ
Max Unit
10 V
6V
VBATRE V
G+4.17%
4.2
4.44 V
2.5 A
0.5
1.5 A
2.5 A
125 °C
10.2.2 Detailed Design Procedure
10.2.2.1 Output Inductor and Capacitor Selection Guidelines
When selecting an inductor, several attributes must be examined to find the right part for the application. First,
the inductance value should be selected. The bq2416xx is designed to work with 1.5µH to 2.2µH inductors. The
chosen value will have an effect on efficiency and package size. Due to the smaller current ripple, some
efficiency gain is reached using the 2.2µH inductor, however, due to the physical size of the inductor, this may
not be a viable option. The 1.5µH inductor provides a good tradeoff between size and efficiency.
Once the inductance has been selected, the peak current must be calculated in order to choose the current
rating of the inductor. Use Equation 5 to calculate the peak current.
IPEA K
= ILOAD(MAX)
´
æ
çè1+
%RIPPP
2
LE
ö
÷ø
(5)
Copyright © 2011â2014, Texas Instruments Incorporated
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35
Product Folder Links: bq24160 bq24160A bq24161 bq24161B bq24163 bq24168
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