ISL6297CR-T Intersil, ISL6297CR-T Datasheet - Page 13

• Manufacturer Part Number: ISL6297CR-T
• Description: IC BATT CHRGR 4.2V LI-ION 16-QFN
• Manufacturer: Intersil

Specifications of ISL6297CR-T

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.3 V ~ 6.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

50Ω and is negligible compared to the external resistors.
When the charger starts to charge, Q3 is turned off to set a
higher temperature range determined by the external
resistor R
The DT pin provides a higher shut down ambient
temperature during the charger operation.
FIGURE 10A. EQUIVALENT CIRCUITS FOR THE NTC DIVIDER
FIGURE 9. THE INTERNAL AND EXTERNAL CIRCUIT FOR
UNDER
TEMP
OVER
TEMP
D
. The equivalent circuit is shown in Figure 10B.
BEFORE CHARGING STARTS
THE NTC INTERFACE
V
V
TMAX
TMIN
R
Q3
CHG
Q1
V2P9
TEMP
DT
GND
13
Q2
2.9V
R
T
R
Q3
U
R1
62k
R2
88.9k
R3
17.8k
R4
31.2k
R5
7k
V2P9
TEMP
DT
GND
R
R
R
D
U
T
ISL6297
When the TEMP pin voltage is “out of the window,” as
determined by the V
charging and indicates a fault condition. When the
temperature returns to the set range, the charger continues
the charge cycle.
V
As the temperature falls, the TEMP pin voltage rises. When
it exceeds the 2.0V V
condition exists. This condition does not clear until the TEMP
pin voltage falls back below the threshold minus the
hysteresis voltage (V
condition exists when the TEMP pin voltage falls below the
0.714V V
temperature operation until the voltage rises above the
threshold plus the hysteresis voltage (V
accuracy of the 2.9V supply voltage is not important
because all the thresholds and the TEMP pin voltage are
ratios determined by the resistor dividers, as shown in
Figure 9.
FIGURE 10B. EQUIVALENT CIRCUITS FOR THE NTC DIVIDER
V
TMAN+
V
TMAX
FIGURE 11. CRITICAL VOLTAGE LEVELS FOR TEMP PIN
V
TMIN-
V
TMAX+
V
V
TMIN
TMAX
V
TMIN-
TMIN
(0.714V)
(0.788V)
(0.788V)
UNDER
(1.83V)
(0.714V)
(1.83V)
TEMP
OVER
TEMP
(2.0V)
(2.0V)
Under
Temp
Temp
Over
2.9V
TMAX
2.9V
0V
0V
DURING CHARGING
threshold and does return to normal
TMIN
TMIN-
TMIN
and V
). Similarly, an over-temperature
threshold, an under temperature
V2P9
TEMP
GND
TMAX
R
T
R
, the ISL6297 stops
R
U
D
TMAX+)
. The actual
July 30, 2007
Voltage
TEMP
FN9215.2
Pin