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參數(shù)資料
| 型號： | LX2203A |
| 廠商： | Microsemi Corporation |
| 英文描述： | Li-Ion Battery Charger |
| 中文描述： | 鋰離子電池充電器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 186K |
| 代理商： | LX2203A |
LX2203A
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
Copyright
2004
Rev. 1.0a, 2005-10-21
W
M
.
C
Li-Ion Battery Charger
TM
A P P L I C A T I O N N O T E
G
ENERAL
D
ESCRIPTION
The LX2203A is designed to charge a single cell Lithium
Ion (Li-ion) battery using two modes: a constant current
mode, where the charge current is held constant and the
battery terminal voltage rises to 4.2V; this is followed by
constant voltage mode, where the battery voltage is held at
4.2V and the charge current starts to taper off. Once the taper
current reaches the charge termination current level the
charge cycle is ended and the STAT indicator turns off. If
the fully charged battery terminal voltage drops to 4.07V, the
battery charge cycle will be restarted.
P
ROTECTION
F
EATURES
Conditioning Current Mode – If the battery terminal
voltage is less than 2.65V, the battery charger will reduce the
charge current to 5%. This also protects the appliance from
overheating by trying to drive the full charging current into a
damaged battery.
Under Voltage Lockout – The charge cycle will not start
until the VIN voltage rises above 4.2V. Hysteresis prevents
chattering on and off.
Thermal Control loop – If the power dissipation of the
charger becomes excessive, the charge current will be
reduced to prevent the die temperature from getting above
150
°C.
This does not cause the charge cycle to stop.
Reverse current blocking – If VIN is grounded, current
will not flow from the battery through the charger. No
external blocking diode is required on the input.
Sleep Mode – If the EN pin is logic low or if VIN is
removed, the charger enters a sleep mode where a very low
quiescent current prevents drain from the battery.
L
AYOUT
G
UIDELINES
It is important when laying out the LX2203A to place
10μF ceramic capacitors close to the VIN and V
BAT
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 LX2203A
package to the ground plane of the circuit board to maximize
the heat dissipation. To minimize charge time it is best not to
rely on the thermal control feature as this feature will extend
the charging time when activated.
T
ERMINATION
C
URRENT
P
ROGRAMMING
The charge termination current (or minimum taper
current) is set by selecting a value for the CTP resistor using
the following formula:
CTP
TERM
7500
R
=
I
For example, for a termination current of 50mA set R
CTP
= 150k. This formula applies to termination currents
ranging from 20mA to 500mA.
It is possible to change the termination current to different
levels for different charge rates. For a “quick charge”, the
termination current can be set to about 50% of the constant
current level; this charges the battery to about 75% capacity.
For a full charge (taking several hours) the termination
current can be set to 5% of the constant current level. The
circuit below allows switching between the two levels:
150k
16.5k
CTP
Quick/Slow
Figure 5
– 500mA or 50mA termination current
C
ONSTANT
C
HARGE
C
URRENT
P
ROGRAMMING
The charge current during the constant current charge
mode is programmable by controlling the current flowing
from the CCP pin. A graph showing this relationship is
included in this specification. The CCP pin is regulated to
1.25V when the charger is active. Connecting a resistor from
the CTP to ground will produce a CTP current of:
CTP
CCP
1.25
I
=
R
(Continued on next page)
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PDF描述 |
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| LX2203AILD | Li-Ion Battery Charger |
| LX2203 | Li-Ion Battery Charger |
| LX2203CLD | Li-Ion Battery Charger |
| LX2205 | 1A Li-Ion Battery Charger with Power Source Management |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX2203AILD | 制造商:Microsemi Corporation 功能描述:CHGR LI-ION 1A 4.2V 10MLPD - Bulk |
| LX2203CLD | 制造商:Microsemi Corporation 功能描述:CHGR LI-ION 1A 4.2V 10MLPD - Bulk |
| LX2203CLD-TR | 制造商:Microsemi Corporation 功能描述:CHGR LI-ION 1A 4.2V 10MLPD - Tape and Reel |
| LX2205 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:1A Li-Ion Battery Charger with Power Source Management |
| LX2205 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LINEAR - LITHIUM ION - Bulk |
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