ISL6294 Ver la hoja de datos (PDF) - Renesas Electronics
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ISL6294 Datasheet PDF : 9 Pages
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ISL6294
VIN
PPR
POR
EN
GND
PRE
REG
VOS
VREF
VCC
BAT
200k
CHARGE
CONTROL
EN
VREF
VCC
DIE
TEMP
+115°C
BAT
CHG
IMIN
FIGURE 3. BLOCK DIAGRAM
IREF
TRICKLE
CC
4.2V
IREF
2.55V
19%IREF
CV
CHARGE
VOLTAGE
CHARGE
CURRENT
IMIN
76%I REF
CHG
CHG
INDICATION
FIGURE 4. TYPICAL CHARGE PROFILE
TIME
Description
The ISL6294 charges a Li-ion battery using a CC/CV profile.
The constant current IREF is set with the external resistor
RIREF (See Figure 1) and the constant voltage is fixed at
4.2V. If the battery voltage is below a typical 2.55V trickle-
charge threshold, the ISL6294 charges the battery with a
trickle current of 19% of IREF until the battery voltage rises
above the trickle charge threshold. Fast charge CC mode is
maintained at the rate determined by programming IREF until
the cell voltage rises to 4.2V. When the battery voltage
FN9174 Rev 4.00
Jul 9, 2007
reaches 4.2V, the charger enters a CV mode and regulates
the battery voltage at 4.2V to fully charge the battery without
the risk of over charge. Upon reaching an end-of-charge
(EOC) current, the charger indicates the charge completion
with the CHG pin, but the charger continues to output the
4.2V voltage. Figure 4 shows the typical charge waveforms
after the power is on.
The EOC current level IMIN is programmable with the
external resistor RIMIN (See Figure 1). The CHG signal turns
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