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參數(shù)資料
| 型號： | LX2201CLQT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 4 X 4 MM, PLASTIC, MLPQ-20 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 231K |
| 代理商： | LX2201CLQT |
LX2201
PRODUCTION DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright
2000
Rev. 1.0, 2004-04-14
WWW
.Microse
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i
.CO
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USB Li-Ion Battery Charger
TM
APPLICATION NOTE
CURRENT LIMITED POWER SUPPLIES
When using input power supplies that are current limited
or have a high source impedance, the battery charging
current and/or load current can pull the VDD pin down very
close to the battery terminal voltage. This may cause the
LX2201 to enter an indeterminate state where it switches
between charge and discharge modes. To prevent this, the
PNP differential amplifier circuit of Figure 7 can be added;
this circuit adds an additional control loop that regulates the
charger headroom to 300mV by scaling back the battery
charging current.
The internal power switch within the LX2201 requires
the power supply have a minimal level of strength to switch
from discharge mode to charge mode. If the power source is
severely current limited, the LX2201 may not open the
discharge switch. In this case, a small amount of current
will be allowed to flow into the battery unregulated. If left
in this state indefinitely, the current will eventually raise the
battery terminal voltage to the point where the batteries
internal protection circuitry will open the circuit. Typically,
the LX2201 requires a minimum of 80mA in USB mode
and 200mA using the VDD input to force the switchover to
charge mode.
Alternatively, if weak power sources are
used, the switchover from discharge to charge mode can be
forced by momentarily setting VID0 and VID1 to a low
state, which will open the discharge switch allowing the
VDD voltage to rise so the LX2201 can enter charge mode.
USB COMPLIANCE
To be compliant with the USB specification, the +5V
current must be less than 100mA in the low power mode
and less than 500mA in the high power mode.
If the
LX2201 is configured as shown in Figure 3, it is possible
for the system to consume more than the maximum
allowed USB current (in which case the battery charging
current will have been fully scaled back).
If it is not
possible to regulate the load current when charging from a
USB power source and strict adherence to the USB power
budget is required, the LX2201 configuration as shown in
Figure 6 can be used. In this case the system load can be
applied directly to the battery and the LX2201 will prevent
the load + battery from drawing more power than is
allowed for USB compliance. A better approach that
provides battery isolation is shown in Figure 8; in this
approach, the op amp circuit provides a current limiter that
prevents the system from exceeding the USB power limits.
The battery is only discharged if the AC adapter or USB
inputs are removed or current limited.
LAYOUT GUIDELINES
It is important when laying out the LX2201 to
place 10uF ceramic capacitors close to the VDD
and VBAT IC terminals to filter switching
transients.
It is important to provide a low thermal impedance
path from the thermal pad on the bottom of the
LX2201 package to the ground plane of the circuit
board to maximize the heat dissipation.
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