LX2206ILD MICROSEMI [Microsemi Corporation], LX2206ILD Datasheet - Page 7

• Manufacturer Part Number: LX2206ILD
• Description: Dual Level Lithium Ion Battery Charger
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2005
Rev. 1.2, 2006-12-22
G
Ion battery using two steps: a constant current mode
followed by a constant voltage mode. The maximum
charging current during the Constant Current Mode of the
charging profile can be logically set (using H/L) to two
preprogrammed levels set by resistors connected to HCP
and LCP (High and Low current).
terminate constant voltage charging once the current drops
below the taper current setting which is 10% of the high
charge current setting (determined by HCP resistor value).
C
deeply discharged and have a terminal voltage less than
60% of the constant voltage level. The conditioning current
is 5% of the HCP programmable constant current level.
Once the battery terminal voltage exceeds the conditioning
current threshold, the full constant current level is applied
(unless charging current is limited by one of the other
charger control loops).
C
the LX2206 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 termination current
is set by the value of the resistor connected to the HCP
programming pin. The STAT pin changes state when
charging is completed.
T
remains applied, the LX2206 enters a Voltage Monitoring
mode. In this mode the LX2206 monitors the battery
terminal voltage and applies a top off charge if the battery
voltage drops below the top of threshold.
OP
ONDITIONING
HARGE
ENERAL
Once the charger has completed a charge cycle, if power
The LX2206 is designed to charge a single cell Lithium
A conditioning current is applied to batteries that are
To increase system battery life and avoid float charging,
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D
ERMINATION
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ESCRIPTION
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URRENT
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11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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The charger will
T H E O R Y O F O P E R A T I O N
Integrated Products Division
®
Microsemi
voltage is less than 2.7V, 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
short circuited battery.
until the IN voltage rises above 3.8V. Hysteresis helps
alleviate chattering on and off.
charger becomes excessive, the charge current will be
reduced to prevent the die temperature from getting above
140°C. This does not cause the charge cycle to stop.
current will not flow from the BAT pin through the charger.
No external blocking diode is required on the input.
enters a sleep mode where a very low quiescent current
prevents drain from the battery.
Dual Level Lithium Ion Battery Charger
A
The LX2206 supports battery charging from a system that
provides adapter power or USB power using the same
external connector. Figure 1 shows one example of a
system using a special USB adapter cable to determine
whether the power source is USB or Wall Adapter.
Similarly, if the system processor senses the absence of
USB data, it can logically set the H/L logic level high to
allow a higher charge current to be used.
USB C
USB specifications – the Low Power Peripheral (100mA)
and High Power Peripherals (500mA). USB current levels
can be set using the appropriate values for the HCP and
LCP programming resistors. H/L logic input selects USB
high/low charge currents. When the SD pin is pulled high,
the USB input enters Suspend mode and will not present a
load to the IN pin.
DCOK
low to report the presence of the power source with
sufficient voltage to charge the battery. The DCOK
threshold is the larger of the UVLO threshold or the battery
voltage.
P
Conditioning Current Mode – If the battery terminal
Under Voltage Lockout – The charge cycle will not start
Thermal Control loop – If the power dissipation of the
Reverse current blocking – If IN input is grounded,
Sleep Mode – If the SD pin is a logic high, the charger
ROTECTION
DAPTER OR
The IN input is monitored and DCOK is set to a logic
The LX2206 is fully compliant with, and supports, the
HARGE
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RODUCTION
USB S
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EATURES
ODE AND CURRENT LIMIT
ELECTION
D
ATA
S
HEET
LX2206
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