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| BQ25601 Datasheet, PDF (45/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management | |||
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9.2 Typical Application Diagram
3.9 V ± 13.5 V
1F
10 F
Opt.
SYS
SYS
VREF
2.2 k
2.2 k
3 x 10 k
Host
PHY
VAC
VBUS
PMID
PG
STAT
SDA
SCL
INT
CE
PSEL
bq25601
SLUSCK5 â MARCH 2017
SW
BTST
REGN
GND
SYS
SYSTEM
1 H 3.5V ± 4.6V
47 nF
10 F
4.7 µF
bq25601
BAT
10 F
REGN
5.23 k
TS
+
30.1 k 10 k
QON
Optional
Figure 28. Typical Application
9.2.1 Design Requirements
9.2.2 Detailed Design Procedure
9.2.2.1 inductor Selection
The 1.5-MHz switching frequency allows the use of small inductor and capacitor values.maintain an inductor
saturation current higher than the charging current (ICHG) plus half the ripple current (IRIPPLE):
ISAT ⥠ICHG + (1/2) IRIPPLE
(3)
The inductor ripple current depends on the input voltage (VVBUS), the duty cycle (D = VBAT/VVBUS), the switching
frequency (fS) and the inductance (L).
IRIPPLE
=
VIN
´ D ´ (1 -
fs ´ L
D)
(4)
The maximum inductor ripple current occurs when the duty cycle (D) is 0.5 or approximately 0.5. Usually inductor
ripple is designed in the range between 20% and 40% maximum charging current as a trade-off between
inductor size and efficiency for a practical design.
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