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參數(shù)資料
| 型號(hào)： | ISL9203A |
| 廠商： | Intersil Corporation |
| 英文描述： | Li-ion/Li Polymer Battery Charger |
| 中文描述： | Li-ion/Li聚合物電池充電器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 320K |
| 代理商： | ISL9203A |
12
FN6430.0
February 14, 2007
Charge Current Thermal Foldback
Over-heating is always a concern in a linear charger. The
maximum power dissipation usually occurs at the beginning
of a charge cycle when the battery voltage is at its minimum
but the charge current is at its maximum. The charge current
thermal foldback function in the ISL9203A frees users from
the over-heating concern.
Figure 21 shows the current signals at the summing node of
the current error amplifier CA in the Block Diagram. I
R
is the
reference. I
T
is the current from the Temperature Monitoring
block. The I
T
has no impact on the charge current until the
T
rises at a rate of 1μA/°C. When I
T
rises, the current control
loop forces the sensed current I
SEN
to reduce at the same
rate. As a mirrored current, the charge current is 100,000
times that of the sensed current and reduces at a rate of
100mA/°C. For a charger with the constant charge current
set at 1A, the charge current is reduced to zero when the
internal temperature rises to +110°C. The actual charge
current settles between +100°C to +110°C.
Usually the charge current should not drop below I
MIN
because of the thermal foldback. For some extreme cases if
that does happen, the charger does not indicate end-of-
charge unless the battery voltage is already above the
recharge threshold.
2.8V Bias Voltage
The ISL9203A provides a 2.8V voltage for biasing the
internal control and logic circuit. This voltage is also
available for external circuits such as the NTC thermistor
circuit. The maximum allowed external load is 2mA.
Indications
The ISL9203A has two indications: the input presence and
the charge status. The input presence is indicated by the
V2P8 pin and the charge status is indicated by the STATUS
pin. Figure 22 shows the V2P8 pin voltage vs. the input
voltage.
STATUS Pull-Up Resistor
The STATUS pin is an open-drain output that need an
external pull-up resistor. It is recommended that this be
pulled up to the input voltage or the 2.8V from the V2P8 pin.
If the STSTUS pin has to be pulled up to other voltages, the
user needs to examine carefully whether or not the ESD
diodes will form a leakage current path to the battery when
the input power is removed. If the leakage path does exist,
an external transistor is required to break the path.
Figure 23 shows the implementation. If the STATUS pin is
directly pulled up to the VCC voltage (not shown in Figure 23),
a current will flow from the VCC to the STATUS pin, then
through the ESD diode to the VIN pin. Any leakage on the VIN
pin, caused by an external or internal current path, will result
in a current path from VCC to ground.
The N-Channel MOSFET Q
1
buffers the STATUS pin. The
gate of Q
1
is connected to VIN or the V2P8 pin. When the
STATUS pin outputs a logic low signal, Q
1
is turned on and
its drain outputs a low signal as well. When STATUS is high
impedance, R
1
pulls the Q
1
drain to high. When the input
power is removed, the Q
1
gate voltage is also removed, thus
the Q
1
drain stays high.
Shutdown
The ISL9203A can be shutdown by pulling the EN pin to
ground. When shut down, the charger draws typically less
than 30μA current from the input power and the 2.8V output
at the V2P8 pin is also turned off. The EN pin needs be
driven with an open-drain or open-collector logic output, so
that the EN pin is floating when the charger is enabled. If the
EN pin is driven by an external source, the POR threshold
voltage will be affected.
FIGURE 21. CURRENT SIGNALS AT THE AMPLIFIER CA INPUT
TEMPERATURE
+100°C
IR
IT
ISEN
FIGURE 22. THE V2P8 PIN OUTPUT vs THE INPUT VOLTAGE
AT THE VIN PIN. VERTICAL: 1V/DIV,
HORIZONTAL: 100ms/DIV
3.4V
2.4V
2.8V
V
IN
V2P8
ISL9203A
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