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ISL9203CRZ-T Datasheet

  • ISL9203CRZ-T

  • Li-ion/Li Polymer Battery Charger

  • 518.36KB

  • 16页

  • INTERSIL   INTERSIL

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ISL9203
Recharge
After a charge cycle completes, charging is prohibited until
the battery voltage drops to a recharge threshold, V
RECHRG
(see Electrical Specifications). Then a new charge cycle
starts at point t
6
and ends at point t
8
, as shown in Figure 20.
The safety timer is reset at t
6
.
current mode is 100,000 times that of the current in the
R
IREF
resistor. Hence, the charge current is,
5
0.8V
-
I
REF
= ----------------
脳
10
(
A
)
R
IREF
(EQ. 6)
Internal Oscillator
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external timing
capacitor, C
TIME
, as shown in Typical Applications. The
oscillator charges the timing capacitor to 1.5V and then
discharges it to 0.5V in one period, both with 10碌A current.
The period T
OSC
is:
T
OSC
=
0.2
鈰?/div>
10
鈰?/div>
C
TIME
6
Table 1 shows the charge current vs. selected R
IREF
values.
The typical trickle charge current is 10% of the programmed
constant charge current. Table 2 shows the trickle charge
current tolerance guidance at given R
IREF
values, when the
battery voltage is between 0V to 2.5V. Use this guidance
only for mass production tests in customer鈥檚 products.
TABLE 1. CHARGE CURRENT vs R
IREF
VALUES.
CHARGE CURRENT (mA)
R
IREF
(k鈩?
267 ~ 160
MIN
17% lower than
TYP Value
450
720
810
900
TYP
= I
REF
in EQ. 5
500
800
900
1000
MAX
17% higher than
TYP Value
550
880
990
1100
(
sec onds
)
(EQ. 3)
A 1nF capacitor results in a 0.2ms oscillation period.The
accuracy of the period is mainly dependent on the accuracy
of the capacitance and the internal current source.
160
100
88.9
80
Total Charge Time
The total charge time for the CC mode and CV mode is
limited to a length of TIMEOUT. A 22-stage binary counter
increments each oscillation period of the internal oscillator to
set the TIMEOUT. The TIMEOUT can be calculated as:
TIMEOUT
=
2
22
TABLE 2. TRICKLE CHARGE CURRENT vs R
IREF
VALUES.
TRICKLE CHARGE CURRENT (mA)
R
IREF
(k鈩?
267
MIN
15
30
40
45
70
TYP
30
50
80
90
100
MAX
60
80
120
135
150
鈰?/div>
T
OSC
(EQ. 4)
or
C
TIME
-
TIMEOUT
=
14
鈰?/div>
-----------------
1nF
(
minutes
)
(EQ. 5)
160
100
88.9
80
A 1nF capacitor leads to 14 minutes of TIMEOUT. For
example, a 15nF capacitor sets the TIMEOUT to be 3.5
hours. The charger has to reach the end-of-charge condition
before the TIMEOUT, otherwise, a TIMEOUT fault is issued.
The TIMEOUT fault latches up the charger. There are two
ways to release such a latch-up: either to recycle the input
power, or toggle the EN pin to disable the charger and then
enable it again.
The trickle mode charge has a time limit of 1/8 TIMEOUT. If
the battery voltage does not reach V
MIN
within this limit, a
TIMEOUT fault is issued and the charger latches up. The
charger stays in trickle mode for at least 15 cycles of the
internal oscillator and, at most, 1/8 of TIMEOUT, as shown in
Figure 20.
TABLE 3. EOC CURRENT vs R
IREF
VALUES.
EOC CURRENT (mA)
R
IREF
(k鈩?
267
160
100
88.9
80
MIN
15
20
40
45
70
TYP
30
50
80
90
100
MAX
60
80
120
135
150
Charge Current Programming
The charge current in the CC mode is programmed by the
IREF pin. The voltage of IREF is regulated to a 0.8V
reference voltage. The charging current during the constant
The ISL9203 is designed to be safe when the IREF pin is
accidentally short-circuited to an external source or to
ground. If the IREF pin is driven by an external source to
below 0.38V or above 1.5V for any reason, the charger is
disabled and the FAULT pin turns to LOW to indicate a fault
FN6106.0
February 3, 2005
12

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