ISL9220IRTZ-T Intersil, ISL9220IRTZ-T Datasheet - Page 12

• Manufacturer Part Number: ISL9220IRTZ-T
• Description: IC BATT CHRGR LIION 1CELL 20TQFN
• Manufacturer: Intersil

Specifications of ISL9220IRTZ-T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.5 V ~ 14 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The input capacitor should be placed as close as possible
to the VIN pin. The ground of the input and output
capacitors should be connected as close as possible as
well. In addition, a solid ground plane is helpful for a
good EMI performance.
The ISL9220, ISL9220A employs a thermal enhanced
QFN package with an exposed pad. In order to maximize
the current capability, it is very important that the
exposed pad under the package is properly soldered to
the board and is connected to other layers through
thermal vias. More thermal vias and more copper
attached to the exposed pad usually results in better
thermal performance. The exposed pad is big enough for
5 vias as shown in Figure 8.
FIGURE 8. EXPOSED PAD
12
ISL9220, ISL9220A
Charging Flow Chart
The charging flow chart is shown in Figure 9 The
charging starts with the trickle mode, the ISL9220,
ISL9220A charges the battery in a trickle current. If V
reaches V
interval, the operation will change to CC mode. When the
output voltage reaches the 4.2V final voltage, the
operation will change to CV mode, where the battery is
charged at a constant voltage. If the end-of-charge
current is reached before the timeout interval is elapsed,
the operation will come to charge complete state. The
charging is terminated. After the termination, if the
output voltage drops below the recharge threshold, a
recharge starts and the timer is reset to zero.
In the event that the timeout condition is reached before
EOC, the fault mode is entered. The fault mode can also
be triggered by a V
the input power has to be removed and re-applied, or the
EN pin is toggled to HI and back to LO, then a new cycle
starts.
PCHG2
before the trickle charge timeout
BAT
OVP event. To exit the fault mode,
February 8, 2011
FN6936.2
BAT