ISL9214AIRZ Intersil, ISL9214AIRZ Datasheet - Page 9

• Manufacturer Part Number: ISL9214AIRZ
• Description: IC BATTERY CHRGR LI-ION 10-DFN
• Manufacturer: Intersil

Specifications of ISL9214AIRZ

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.3 V ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-VFDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 11 shows the typical charge profile including the
end-of-charge event.
Power Presence Indication
When either the USB or the cradle input voltage is above the
POR threshold, the PPR pin internal open-drain MOSFET
turns on indicating the presence of input power.
Power-Good Conditions
Even if there is power present, the charger will not deliver
any current to the output if the power-good conditions are
not met. The following two conditions together define the
power-good voltage range:
where VPOR is the power-on reset threshold and VOS is the
offset voltage for the input and output voltage comparator. All
of these thresholds have hysteresis, as given in the
“Electrical Specification” table on page 4. The charger will
1. VCDRL or VUSB > VPOR
2. VCDRL or VUSB - VBAT > VOS
I
4.2V
2.6V
I
REF
REF
100
18
TRICKLE
FIGURE 11. TYPICAL CHARGE CYCLE
CC
INDICATION
VOLTAGE
CHARGE
9
I MIN
CHG
CURRENT
CHARGE
CV
TIME
3.9V
ISL9214A
not charge the battery if the input voltage does not meet the
power-good conditions.
Thermal Foldback (Thermaguard™)
The thermal foldback function reduces the charge current
when the internal temperature reaches the thermal foldback
threshold, which is typically +125°C. This protects the
charger from excessive thermal stress at high input voltages.
Input Bypass Capacitors
Due to the inductance of the power leads of the wall adapter
or USB source, the input capacitor type must be properly
selected to prevent high voltage transient during a hot-plug
event. A tantalum capacitor is a good choice for its high
ESR, which provides damping to the voltage transient. Multi-
layer ceramic capacitors, however, have a very low ESR,
and hence, when chosen as input capacitors, a 1Ω series
resistor must be used (as shown in the “Typical Applications”
on page 3) in order to provide adequate damping.
State Diagram
The state diagram for the charger functions is shown in
Figure 12. The diagram starts with the Power-Off state.
When at least one input voltage rises above the POR
threshold, the charge resets it self. If both input voltages are
above the POR threshold, the charger selects the CRDL
input as the power source. Then, if the EN pin is at a logic
HIGH voltage, the charger stays in disabled state. If the EN
pin goes LOW, the fast charge starts. Any time the EN pin
turns HIGH, the charger returns to the disabled state. When
the EOC condition is reached, the CHG will turn to logic
HIGH to indicate a charge complete status but the charge
will continue. The EOC condition is then latched until one of
the four re-charge conditions is encountered, as shown in
Figure 11.
May 5, 2008
FN6698.0