MAX8819A MAXIM [Maxim Integrated Products], MAX8819A Datasheet - Page 17

• Manufacturer Part Number: MAX8819A
• Description: PMIC with Integrated Chargers and Smart Power Selector in a 4mm x 4mm TQFN
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 2 shows the typical Li+/Li-Poly charge profile for
the MAX8819_, and Figure 3 shows the battery charger
state diagram.
With a valid DC input that is not suspended, the battery
charger initiates a charge cycle once CEN is driven
high. It first detects the battery voltage. If the battery
Figure 2. Li+/Li-Poly Charge Profile
IMPEDANCE
I
I
CHGMAX
V
V
PREQUAL
I
BATREG
BATPRQ
TOPOFF
PMIC with Integrated Chargers and Smart
HIGH
LOW
0
______________________________________________________________________________________
PREQUALIFICATION
Power Selector in a 4mm x 4mm TQFN
Battery Charger
(CONSTANT CURRENT)
FAST-CHARGE
voltage is less than the prequalification threshold
(3.0V), the charger enters prequalification mode and
charges the battery at 10% of the maximum fast-charge
current while deeply discharged. Once the battery volt-
age rises to 3.0V, the charger transitions to fast-charge
mode and applies the maximum charge current. As
charging continues, the battery voltage rises until it
approaches the battery regulation voltage (4.2V typ)
(CONSTANT VOLTAGE)
FAST-CHARGE
TOP-OFF
DONE
17