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參數資料
| 型號： | LX2202 |
| 廠商： | Microsemi Corporation |
| 英文描述： | 2A Li-Ion Linear Charger and Power Control |
| 中文描述： | 第2A鋰離子電池線性充電器和電源控制 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 176K |
| 代理商： | LX2202 |
LX2202
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 9
Copyright
2004
Rev. 1.0, 2005-03-18
W
M
.
C
2A Li-Ion Linear Charger and Power Control
T H E O R Y O F O P E R A T I O N
G
ENERAL
D
ESCRIPTION
The LX2202 is designed to charge a single cell Lithium
Ion battery using two steps: a constant current step
followed by a constant voltage step. The basic charger
function uses the VDD pins as an input and BAT pins as
the output. The LX2202 charger has a programmable
maximum current (programmable by the resistor value
between pin CCP to GND) which is the maximum
charging current during the Constant Current Mode of the
charging profile. The low dropout of the pass element
allows the battery to be charged from a loosely regulated
power supply. In the Constant Voltage Mode, the battery
terminal voltage can be regulated to 4.1V or 4.2V by
strapping the VM pin to VDD or GND, respectively. The
charger will terminate constant voltage charging once the
current drops below the minimum current setting
(programmable by the resistor value between pin CTP to
GND).
The LX2202 has an integrated thermostat with a linear
thermal regulation loop that will throttle back the charging
current to prevent the internal die temperature from
exceeding 150oC. This feature prevents damage to the
system board when the IC exceeds its thermal temperature.
C
URRENT
C
HARGE
M
ODE
A conditioning current is applied to batteries that are
deeply discharged and have a terminal voltage less than
60% of the constant voltage level. The conditioning current
is 5% of the CCP programmable constant current level
(except where it might be limited in the USB states). Once
the battery terminal voltage exceeds the 60% level, the full
constant current level is applied (unless charging current is
limited by one of the other charger control loops).
C
HARGE
T
ERMINATION
M
ODE
To increase system battery life and avoid float charging,
the LX2202 turns off the pass element once the battery has
been fully charged. The charge termination state occurs at
the end of constant voltage mode. The charge status
changes state when charging is completed.
T
OP
O
FF
C
HARGE
M
ODE
Once the charger has completed a charge cycle, if
power remains applied, the LX2202 enters a Voltage
Monitoring mode. In this mode the LX2202 monitors the
battery terminal voltage and applies a top off charge if the
battery voltage drops by more than 3% of full scale. This
feature is especially important for charging systems in
equipment where usage is infrequent.
USB
C
HARGE
M
ODE
The LX2202 is fully compliant with, and supports, the
USB specifications – the Low Power Peripheral (100mA)
and High Power Peripherals (500mA). VID1 logic input
selects USB charge currents. The LX2202 senses the
current flowing from the USB terminal to the VDD
terminal; then it limits the USB current by reducing the
current flowing from V
DD
to V
BAT
.
D
ISCHARGE
M
ODE
VID0 is used to enable discharge mode enable. The
system load is connected to VDD. The input power is
connected to VDD through an external diode. When the
input power is removed, the battery current flows from
V
BAT
to VDD. The circuit of Figure 3 shows the LX2202
in a discharge mode configuration with both AC adapter
and USB inputs. The USB input is diode ORed to the
VDD pin and uses a MOSFET to reduce the diode drop
across the ORing diode. The LX2202 provides a signal
“PSW” to control the MOSFET for charge and discharge
modes. When both AC and USB power are applied the
PSW signal is overridden by the AC adapter diode and the
MOSFET is turned off
UNDER
VOLTAGE
LOCK
OUT
The LX2202 has an under voltage lock-out feature that
monitors the VDD terminal and prevents the battery
charger from entering charge mode if the VDD terminal is
less than 3.6V (nominal).
A
P
P
L
I
C
A
T
I
O
N
S
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| LX2202CLQ-TR | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:TM 2A Li-Ion Linear Charger and Power Control |
| LX2203 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Li-Ion Battery Charger |
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