ISL6292BCRZ Intersil, ISL6292BCRZ Datasheet - Page 8

• Manufacturer Part Number: ISL6292BCRZ
• Description: IC CHARGER LI-ION 4.2V 4X4 16QFN
• Manufacturer: Intersil

Specifications of ISL6292BCRZ

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.3 V ~ 6.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Applications Information
Power-On Reset (POR)
The ISL6292B has a 3.4V rising POR threshold. Before the
input voltage reaches the POR threshold, the 2.9V V2P9 pin
outputs 0V and the charger is disabled. Once the POR
threshold is reached, the V2P9 pin outputs 2.9V, the open-
drain MOSFET on the DT pin is turned on, and the ambient
temperature monitoring circuit starts to function. After a
delay and after the input voltage rises above the battery
voltage, the charger control circuit starts to work and the DT
pin impedance becomes high. Figure 3 shows the sequence
of the events at power on. The POR has a falling threshold
of 2.4V typically. At power on, all counters are reset to zero.
Charge Current and R
When the ISL6292B is used as a traditional linear charger,
the R
charge current is 10% of the CC current I
with a current-limited supply, the CC current is determined
by the supply limited current I
programmed higher than I
protection. Taking into account the tolerance of both the I
and I
least 30% higher than the I
following equation:
The trickle charge current is 10% of IREF, that is,
The ISL6292B has a comparator with 100mV offset voltage
to ensure the input voltage is higher than the battery voltage
before charging starts (see the Block Diagram). This
condition requires I
limit for I
I
I
Trickle
REF
REF
IREF
=
=
FIGURE 3. EVENT SEQUENCE AT POWER UP
---------------- -
R
LIM
, it is recommended the I
0.8V
Charger
IREF
Imped
sets the constant charge current. The trickle
---------------- -
R
Start
0.8V
V2P9
D T
IREF
is 1.5A.
VIN
×
10
×
10
5
LIM
( )
A
4
( )
A
be higher than 400mA. The upper
POR
LIM
IREF
LIM
LIM
8
and is used as an overcurrent
. I
Selection
REF
. I
REF
REF
can be found by the
be programmed at
needs to be
REF
. When working
(EQ. 1)
(EQ. 2)
LIM
ISL6292B
Imp e d .
I CHG
VBAT
EOC Current and R
The EOC current is programmed by the IMIN pin and can be
calculated by the following equation:
The EOC current has a programming range up to 400mA.
To qualify as an EOC condition, the charge current needs to
drop below the I
more than three to four cycles of the internal oscillator;
additionally, the battery voltage rises above the recharge
threshold given in the Electrical Specification table.
Internal Oscillator
The internal oscillator establishes a timing reference. The
oscillation period is programmable with an external timing
capacitor, C
oscillator charges the timing capacitor to 1.5V and then
discharges it to 0.5V in one period, both with 10µA current.
The period T
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.
Total Charge Time and C
The total charge time for the CC mode and CV mode is
limited to a length of TIMEOUT, which can be found by:
V2P9
GRN
RED
T
TIMEOUT
I
VIN
MIN
OSC
DT
=
=
t 0
----------------
R
0.8V
0.2 10
IMIN
=
FIGURE 4. OPERATION WAVEFORMS
t 1 t 2 t 3
TIME
⋅
OSC
14
×
6
⋅
10
MIN
, as shown in Typical Applications. The
C
----------------- -
1/8 TIM EOUT
⋅
15 Cycle s to
is:
1nF
4
C
TIME
Th re sh o ld
( )
2.8V V M IN
TIME
Ch arg e
A
level and stay below the IMIN level for
Cycle
POR
IMIN
t 4
M IN
M IN
M IN
(
Selection
V
minutes
TIME
(
RECHRG
sec
t 5
onds
I M IN
Selection
)
)
t 6 t 7
Cycle s
Ch arg e
Cycle
15
April 19, 2005
FN9139 .1
(EQ. 3)
(EQ. 4)
(EQ. 5)
t 8