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LX2206ILD-TR Datasheet(PDF) 8 Page - Microsemi Corporation

Part # LX2206ILD-TR
Description  TM Dual Level Lithium Ion Battery Charger
Download  14 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

LX2206ILD-TR Datasheet(HTML) 8 Page - Microsemi Corporation

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LX2206
PRODUCTION DATA SHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
Copyright
© 2007
Rev. 1.3a, 2007-08-28
Dual Level Lithium Ion Battery Charger
TM
®
APPLICATION NOTE
LAYOUT
In the layout of the Printed Circuit Board (PCB) it is
important to provide a solid path from the IC power and
ground pins to the power and ground planes of the PCB to
provide a good conduction path for heat. This insures the
LX2206 stays cool and can provide the maximum charge
current to minimize the time required to charge the battery.
For stability purposes and to reduce voltage switching
transients it is important to place capacitors close to the IN
and BAT pins. A 10µF capacitor (X5R or X7R dielectric)
is recommended.
CURRENT PROGRAMMING RESISTORS
The LX2206 has two programming resistors to control
the battery charging current during the constant current
charging mode of the battery charging cycle.
When the
H/L pin is high (selecting the High Current charging mode),
the charge current is determined by the value of the HCP
programming resistor. The maximum charge current is
determined by the programming current at either the HCP
or LCP programming pins (depending on the state of H/L);
the range of each of these channels is identical.
The
programming current is the HCP or LCP pin voltage
(typically 1.25V) divided by the value of the programming
resistor. For example, the HCP current with a 110K resistor
to GND is:
11.4µA
110k
1.25
R
1.25
I
HCP
HCP
=
=
=
Charge Current vs IHCP (or ILCP)
0
200
400
600
800
1000
1200
0.00
50.00
100.00
150.00
IHCP (in uA)
Using the table below it can be seen that for a
programming current value of 11.4µA, the corresponding
maximum charge current is 92mA.
The termination current determines the point at which
the charge cycle is terminated and the battery is determined
to be fully charged. The termination current is determined
by the value of the HCP programming current as
determined by the HCP programming resistor. For a value
of IHCP = 11.4µA (as was used in the previous example),
the termination current from the chart below can be seen to
be 9mA.
Term ination Current vs IHCP
0
20
40
60
80
100
120
0.00
50.00
100.00
150.00
IHCP (in uA)
The termination current is always roughly 10% of the
maximum charge current set by the HCP resistor.


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