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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)： | 10/11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 8
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
TH EORY OF O PERAT ION
GENERAL DESCRIPTION
The LX2201 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. This basic 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 of
the charging profile 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).
In the CONDITIONING CHARGE mode 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).
The LX2201 has a built in thermostat that will throttle
back the charging current to prevent the internal die
temperature from exceeding 150C. This feature prevents
the IC from getting hot enough to damage the board. This
feature can reduce the settings dictated by the constant
voltage and constant current control loops to reduce power
dissipation in the IC.
The LX2201 will turn off the pass element once the
battery has been fully charged. This is to prevent float
charging, which has been shown to reduce Lithium ion
battery life. The charge termination state occurs at the end
of the constant voltage charge mode where the battery
draws less current as it nears full capacity.
The high
precision of the LX2201 in low current state lets the battery
continue charging to the point where the charging current
has dropped to the Charge Termination Current set by the
Charge Termination Programming Pin.
Once the charger has completed a charge cycle, if
power remains applied, the LX2201 enters a VOLTAGE
MONITORING mode. In this mode the LX2201 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 emergency equipment were usage is infrequent.
The USB states insure compliance with the USB
specification. There are two current limitations imposed
by the specification; a Low Power peripheral is to draw
less than 100mA unless configure by the host controller as
a High Power peripheral which increases the current
limitation to 500mA.
While the LX2201 will not
negotiate the host for the power designation it must insure
that the total current through VIN is less than, or equal to,
the stated current limitation.
To accomplish this the
constant current loop will sense the current through VIN
and dynamically scale IBAT to maintain the desired input
current. It must be noted that the circuit does not limit the
input current and only scales the charging current. It is
possible that a system would draw more than 100mA
through VDD, and as a result fail USB compliance. In this
case the LX2201 would have scaled the charging current
to zero. This feature allows for the fastest possible charge
time in a USB configuration by allocating unused power
for the charger without limiting system performance or
features.
The LX2201 has two unique features which assist in the
power control design.
The pass element can be
programmed by the VID0 pin to be bi-directional. This
allows the pass element to be used as a power switch to
provide a low impedance path around the Oring diode
without the need to use an external MOSFET. The other
feature is a logic output that enhances an external PMOS
FET when the LX2201 is in a charging mode (ie VDD >
VBAT). This provides a low impedance path around the
Oring diode that is typically used in a multiple source
power distribution. Lowering the voltage drop across the
Oring diode is especially helpful for use with low voltage
power inputs such as USB.
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相關(guān)代理商/技術(shù)參數(shù) |
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| LX2201CLQ-TR | 制造商:Microsemi Corporation 功能描述:CHGR/CHRGR CONST I/V LI-ION 2A 4.2V 20MLPQ - Tape and Reel |
| LX2202 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:2A Li-Ion Linear Charger and Power Control |
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| LX2202_06 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:TM 2A Li-Ion Linear Charger and Power Control |
| LX2202CLQ | 制造商:Microsemi Corporation 功能描述:CHG MGMT LI-ION 4.2V 20MLPQ - Bulk |
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