ISL78693 Datasheet, PDF (16/18 Pages) Intersil Corporation – Reverse battery leakage 700nA

ISL78693
VIN
VPACK
VIN
VPACK
VIN
VPACK
POWER
CONSTANT CURRENT
CHARGE
CURRENT
CONSTANT VOLTAGE
TIME
POWER
CHARGE
CURRENT
CONSTANT RES
CURRENT LIMIT
CONSTANT
VOLTAGE
TIME
POWER
CONSTANT
CURRENT
CHARGE
CURRENT
CONSTANT
VOLTAGE
TIME
FIGURE 30A.
FIGURE 30B.
FIGURE 30C.
FIGURE 30. THE OPERATING CURVES WITH THREE DIFFERENT CURRENT-LIMITED POWER SUPPLIES
IREF Programming Using Current-Limited
Adapter
The ISL78693 has 20% tolerance for the charge current.
Typically, the current-limited adapter also has 10% tolerance. In
order to guarantee proper operation, it is recommended that the
nominal charge current be programmed at least 30% higher
than the nominal current limit of the adapter.
Board Layout Recommendations
The ISL78693 internal thermal foldback function limits the
charge current when the internal temperature reaches
approximately +100°C. In order to maximize the current
capability, it is very important that the exposed pad under the
package is properly soldered to the board and is connected to
other layers through thermal vias. More thermal vias and more
copper attached to the exposed pad usually result in better
thermal performance. On the other hand, the number of vias is
limited by the size of the pad. The 3x3 DFN package allows nine
vias to be placed in three rows. Since the pins on the 3x3 DFN
package are on only two sides, as much top layer copper as
possible should be connected to the exposed pad to minimize the
thermal impedance. Refer to UG098, “ISL78693EVAL1Z
Evaluation Board User Guide” for layout example.
V_IN
V_BAT
I_BAT
1 hour
FIGURE 32. SCOPE WAVEFORMS SHOWING THE FULL-LOAD POWER
SUPPLY VOLTAGE AS HIGHER THAN THE CRITICAL
VOLTAGE
V_IN
V_BAT
I_BAT
CV Mode
CC Mode
Resistance Limit Mode
FIGURE 31. SCOPE WAVEFORMS SHOWING THE THREE MODES
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December 12, 2016