Datasheet

MAX8819A/MAX8819B/MAX8819C
PMIC with Integrated Chargers and Smart
Power Selector in a 4mm x 4mm TQFN
18 ______________________________________________________________________________________
where charge current starts tapering down. When
charge current decreases to 10% of the maximum fast-
charge current, the charger enters a 33min top-off state
and then charging stops. If the battery voltage subse-
quently drops 100mV below the battery regulation volt-
age, charging restarts and the timers reset.
The battery charge rate is set by several factors:
• Battery voltage
• DC input current limit
• The charge-setting resistor, R
CISET
• The system load (I
SYS
)
• The die temperature
ANY STATE
V
BAT
> 3V,
IC SETS TIMER = 0
V
BAT
< 2.82V
IC SETS TIMER = 0
DLIM[1:2] ≠ 11
CEN = 1
IC SETS TIMER = 0
CHARGER DISABLED
I
CHG
= 0mA
CHG = 1
DONE
(V
BATREG
-100mV) ≤ V
BAT
≤ V
BATREG
I
CHG
= 0mA
CHG = 1
TOP-OFF
CHG = 1
V
BAT
= V
BATREG
I
CHG
≤ I
CHGMAX
/10
TIMER SUSPEND
I
CHG
< (I
CHGMAX
x 20%)
CHG = 0
FAST-CHARGE
I
CHG
≤ I
CHGMAX
CHG = 0
PREQUALIFICATION
I
CHG
≤ I
CHGMAX
/10
CHG = 0
TIMER FAULT
I
CHG
= 0mA
CHG = 2Hz SQUAREWAVE
TIMER EXTEND
(I
CHGMAX
x 20%) < I
CHG
< (I
CHGMAX
x 50%)
CHG = 0
NO INPUT POWER
I
CHG
= 0mA
CHG = 1
INPUT SUSPENDED
DLIM[1:2] = 11
I
CHG
= 0mA
CHG = 1
DC = INVALID
DLIM[1:2] = 11
DC = VALID
CEN = 0
t > t
PREQUAL
t > t
FSTCHG
I
CHG
< I
CHGMAX
x 53%
OR V
BAT
= V
BATREG
IC RESUMES TIMER
I
CHG
< I
CHGMAX
x 50%
AND V
BAT
< V
BATREG
IC EXTENDS TIMER BY 2x
I
CHG
< I
SET
x 23%
OR V
BAT
= V
BATREG
IC RESUMES TIMER
I
CHG
< I
CHGMAX
x 20%
AND V
BAT
<V
BATREG
IC SUSPENDS
TIMER
V
BAT
< (V
BATREG
100mV)
IC SETS TIMER = 0
I
CHG
< I
CHGMAX
x 10% AND V
BAT
IC SETS TIMER = 0
t
TOPOFF
>
I
CHG
< I
CHGMAX
x 20%
IC SETS TIMER = 0
I
CHGMAX
= 2000 x
1.5V
R
CISET
33min
Figure 3. Li+/Li-Poly Charger State Diagram