LX2203AILD MICROSEMI [Microsemi Corporation], LX2203AILD Datasheet - Page 9

• Manufacturer Part Number: LX2203AILD
• Description: Li-Ion Battery Charger
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2004
Rev. 1.0a, 2005-10-21
C
(C
Settings along with the associated CCP pin current and
programming resistor:
changing the R
termination current is independent of the charge current,
lowering the constant charge current will increase the charge
time, but will not reduce the stored charge in the battery at
the charge termination point.
drive it directly with CMOS logic, but this requires that the
CMOS logic power supply be well regulated (±2%). Each
switch resistor leg in Figure 4 can be replaced with a two
resistor network tied to the output of a CMOS gate.
configured to charge at 1A, 500mA or 100mA. The switches
are logically controlled and reduce the resistance at the CCP
pin when switched in. It is possible to eliminate the
MOSFET devices if open drain logic is available.
from the appliance processor which would need to have the
capability to communicate over the USB interface. If there
is only one power connector and the USB interface is active,
the logic could assume the power was coming from the USB
bus and not the wall adapter. If the USB interface is active,
the USB application will know if the appliance has been
enumerated as a high or low load and would set CP1 and
CP2 appropriately.
ONSTANT
ONTINUED
The table below lists some popular Constant Current
It is possible to change the constant current setting by
The circuit in Figure 4 is an example of a battery charger
The logic for the CP1 and CP2 would normally come
It is possible to change the current programming circuit to
Charge Current
500mA
100mA
TM
1.0A
C
)
HARGE
CCP
resistor while in charge mode. Since the
C
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
URRENT
I
CCP
13.75µA
6.22µA
1.00µA
Current
P
ROGRAMMING
A P P L I C A T I O N N O T E ( C O N T I N U E D )
R
CCP
1200K
Integrated Products Division
90.9K
200K
Value
®
Microsemi
For V
These values should provide charge currents of 100mA and
500mA
between the CMP pin and V
C
OMPENSATION CAPACITOR
Figure 6 – Circuits to provide 100mA and 500mA
The values of R1 and R2 are selected such that:
Solving these equations:
A compensation capacitor of value 0.01µF is required
V
500mA/100mA
R
CC
1
CC
.
=
×
= 3.3V and R
500mA/100mA
V
R
Li-Ion Battery Charger
CC
P
1
RODUCTION
R
. 1
+
×
2
constant charge currents.
25
R
CCP
R
2
SW
Vcc
=
SW
. 1
= 243k; R1 = 649k; R2 = 392k.
25
&
CCP
IN.
D
ATA
R
&
R1
Rsw
243k
2
R2
S
=
R
R
HEET
1
1
R
R
×
+
1
1
R
R
×
−
1.21M
2
2
R
R
SW
SW
LX2203A
=
R
SW
1.21M
Page 9