ISL9209CIRZ Intersil, ISL9209CIRZ Datasheet - Page 7

• Manufacturer Part Number: ISL9209CIRZ
• Description: IC SAFETY SYSTEM CHARGER 12-TDFN
• Manufacturer: Intersil

Specifications of ISL9209CIRZ

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 12-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Operating Performance
Theory of Operation
The ISL9209C is an integrated circuit (IC) optimized to
provide a redundant safety protection to a Li-ion battery from
charging system failures. The IC monitors the input voltage,
the battery voltage, and the charge current. When any of the
above three parameters exceeds its limit, the IC turns off an
internal P-Channel MOSFET to remove the power from the
charging system. In addition to the above protected
parameters, the IC also monitors its own internal
temperature and turns off the P-Channel MOSFET when the
temperature exceeds +140°C. Together with the battery
charger IC and the protection module in a battery pack, the
charging system has triple-level protection from
overcharging the Li-ion battery and is two-fault tolerant. The
ISL9209C protects up to 30V input voltage.
FIGURE 20. EN INPUT THRESHOLD vs TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-50
-20
TEMPERATURE (°C)
FIGURE 22. ON-RESISTANCE vs TEMPERATURE AT DIFFERENT INPUT VOLTAGES
10
7
40
70
0.5
0.4
0.3
0.2
0.1
0
-50
The test conditions for the Typical Operating Performance are: V
R
100
ILIM
3V
= 25.5kΩ, R
-20
130
ISL9209C
TEMPERATURE (°C)
10
4.3V
VB
5.5V
= 200kΩ, Unless Otherwise Noted. (Continued)
40
Power-up
The ISL9209C has a power-on reset (POR) threshold of
2.6V with a built-in hysteresis of 125mV. Before the input
voltage reaches the POR threshold, the internal power PFET
is off. Approximately 10ms after the input voltage exceeds
the POR threshold, the IC resets itself and begins the soft-
start. The 10ms delay allows any transients at the input
during a hot insertion of the power supply to settle down
before the IC starts to operate. The soft-start slowly turns on
the power PFET to reduce the in-rush current as well as the
input voltage drop during the transition. The power-up
behavior is illustrated in Figure 2.
Input Overvoltage Protection (OVP)
The input voltage is monitored by the comparator CP1 in the
“Block Diagram” on page 3 (Figure 1). CP1 has an accurate
reference of 1.2V from the bandgap reference. The OVP
threshold is set by the resistive divider consisting of R
R
2
FIGURE 21. EN PIN INTERNAL PULL-DOWN RESISTANCE
. The protection threshold is set to 5.85V. When the input
70
5V
250
240
230
220
210
200
190
180
170
160
150
100
-50
130
-20
TEMPERATURE (°C)
10
40
IN
= 5V, T
70
A
= +25°C,
100
January 16, 2009
130
FN6489.1
1
and