BQ25015 Datasheet, PDF (10/28 Pages) Texas Instruments – SINGLE-CHIP CHARGER AND DC/DC CONVERTER IC FOR PORTABLE APPLICATIONS

bq25015
bq25017
SLUS721A – DECEMBER 2006 – REVISED MARCH 2007
FUNCTIONAL DESCRIPTIONS
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BATTERY CHARGER
The bq2501x supports a precision Li-Ion or Li-Pol charging system suitable for single-cell battery packs and a
low-power DC-DC converter for providing power to system processor. See a typical charge profile, application
circuit and an operational flow chart in Figure 12 through Figure 14 respectively. Figure 13 is the typical
application circuit for a high-current application (300 mA). Here the battery charge current is 500 mA, input
voltage range of 4.5V – 6.5V.
Figure 12. Typical Charger Profile
AC Adapter
VDC
GND
10μF
bq25015RHL
5 AC
SW 19
FB 2
VBUS
GND
USB Port
10μF
10kΩ
10kΩ
6 USB _{BAT/OUT 17}
BAT/OUT 16
7 STAT1
8 STAT2
4 EN
ISET1 12
3 VSS
ISET2 13
9 VSS
CE ¹⁵
18 VSS
PG ¹⁴
L_OUT
10 µH
R1
C₁
C_OUT
10 µF
R2
C₂
Battery
Pack
PACK+
C_CHG
+
1 µF
PACK−
SYSTEM
1.62 kΩ
R₁=261 kΩ
R₂=100 kΩ
C₁=68 pF
C₂=100 pF
Control and
Status Signals
Figure 13. Typical Application Circuit
typ_app_lus721
10
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