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| BQ25606 Datasheet, PDF (26/43 Pages) Texas Instruments – Standalone 3.0-A, Single Cell Battery Charger With 40V Over Voltage Protection Controller | |||
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bq25606
SLUSCK6 â MAY 2017
Typical Application Diagram (continued)
Input
3.9 V to 13.5 V
1F
10 F
Host
SYS SYS
2.2 k
2.2 k
450
VBUS
PMID
ACDRV
VAC
/PG
STAT
OTG
ICHG
/CE
bq25606
D+
USB
D-
Float: VREG = 4.208 V
Short : VREG = 4.352 V
RPD=10 NŸ: VREG = 4.400 V
RPD
VSET
www.ti.com
SW
BTST
REGN
GND
SYS
1H
System
3.5 V to 4.6 V
47 nF
10 F
4.7 µF
BAT
10 F
REGN
5.23 k
TS
+
30.1 k 10 k
ILIM
240
Figure 19. bq25606 Application Without OVPFET
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 to maintain an inductor
saturation current higher than the charging current (ICHG) plus half the ripple current (IRIPPLE):
ISAT ⥠ICHG + (1/2) IRIPPLE
(4)
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)
(5)
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.
26
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