ISL9212IRZ Intersil, ISL9212IRZ Datasheet - Page 7

• Manufacturer Part Number: ISL9212IRZ
• Description: IC SAFETY SYSTEM CHARGER 12-TDFN
• Manufacturer: Intersil

Specifications of ISL9212IRZ

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.3 V ~ 6.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 12-TDFN
• Battery Protection: Over Voltage
• No. Of Batteries: 1
• Supply Voltage Range: 4.3V To 6.5V
• Battery Ic Case Style: TDFN
• No. Of Pins: 12
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Operating Performance
Theory of Operation
The ISL9212 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 over-charging the Li-ion battery and is
two-fault tolerant. The ISL9212 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
FIGURE 22. ON-RESISTANCE vs TEMPERATURE AT DIFFERENT INPUT VOLTAGES AND LOAD CURRENTS
-20
TEMPERATURE (°C)
10
7
40
70
0.35
0.30
0.25
0.20
0.15
0.10
0.05
100
The test conditions for the Typical Operating Performance are: V
R
0
-50
ILIM
FROM TOP TO BOTTOM V
3V/1.5A, 3V/0.5A, 4.6V/1.5A, 4.6V/0.5A,
5V/1.5A, 5V/0.5A, 6.5V/1.5A, AND 6.5V/0.5A
= 25.5kΩ, R
130
-20
ISL9212
TEMPERATURE (°C)
10
VB
= 200kΩ, Unless Otherwise Noted. (Continued)
40
Power-Up
The ISL9212 has a power-on reset (POR) threshold of 2.6V
with a built-in hysteresis of 100mV. 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 (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
protection threshold is set to 6.8V. When the input voltage
IN
FIGURE 21. EN PIN INTERNAL PULL-DOWN RESISTANCE
AND I
70
LOAD
250
240
230
220
210
200
190
180
170
160
150
100
-50
ARE:
130
-20
TEMPERATURE (°C)
10
40
IN
= 5V, T
1
70
and R
A
= +25°C,
100
2
. The
June 30, 2008
130
FN9280.2