LX2205 データシートの表示（PDF） - Microsemi Corporation
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LX2205 Datasheet PDF : 14 Pages
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TM
1k
Wall Adapter
USB Power
10uF
Suspend
High/Low
Shutdown
LX2205
® 1A Li-Ion Battery Charger with Power Source Management
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
Si5441BDC
DC OK
MDC
CMP
USB LX2205
SYS
BAT
SUSP
UCL
SHDN
GND
CCP
CTP
CHG
DONE
CUS TFB
0.1uF
2.4k
2.4k
49.9k 9.09k 2.26k
953k
10uF
88.7k
12.4k
100k
Thermistor
Adapter Present
10k
System Load
10uF
Li-Ion
Figure 3 – AC Adapter and USB Supply (Charge and Discharge Modes) with 1A charging and 100mA termination current.
In this application, the wall adapter voltage is not well regulated and can dip to less than 4.7V. For this case, a reverse
blocking MOSFET is used instead of the reverse blocking diode, shown in the Product Highlight. This extends the operating
range of the LX2205 because the drop across the MOSFET is minimal. It also increases efficiency by eliminating the power
loss of the schottky diode.
USB Power
10uF
Suspend
High/Low
Shutdown
DC OK
USB
SUSP
UCL LX2205
CMP
SYS
BAT
SHDN
MDC
GND
CCP
CTP
CHG
DONE
CUS TFB
100k
20k
2.26k
0.1uF
2.4k
2.4k
95.3k
10uF
System Load
Q1
BSS84
8.87k
10uF
1.24k
Li-Ion
10k
Thermistor
Figure 4 – This application uses only a USB input with 500mA and 100mA maximum current limit levels and a 50mA
termination current level. MOSFET Q1 turns off the TFB resistor string when not in charge mode to prevent battery drain;
this is particularly helpful when using a small thermistor resistance value in the battery pack.
Copyright © 2007
Rev. 1.0a, 2007-03-02
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
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