Datasheet
MAX8662/MAX8663
Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
24 ______________________________________________________________________________________
DC Input Current-Limit Selection
(PEN1/PEN2)
The input current limit can be set to a variety of values
as shown in Table 1. When the PEN1 input is low, a
USB source is expected at DC and the current limit is
set to either 95mA or 475mA by PEN2.
When PEN1 is high, an AC adapter is expected at DC
and the current limit is set based on a programming resis-
tor at PSET. The DC input current limit is calculated from:
I
DC_LIM
= 2000 x (1.5 / R
PSET
)
An exception is when the battery charger is disabled
(CEN high) with PEN2 low, where the MAX8662/
MAX8663 enter USB suspend mode.
Power-OK Output (
POK
)
POK is an active-low open-drain output indicating DC
status. When the voltage at DC is between the under-
voltage and the overvoltage thresholds, and is greater
than the BAT voltage, POK pulls low to indicate that
input power is OK. Otherwise, POK is high impedance.
POK is not affected by the states of PEN1, PEN2, or
CEN. POK remains active in thermal overload.
Battery Charger
The battery charger state diagram is illustrated in
Figure 4.
With a valid AC adapter/USB voltage present, the bat-
tery charger initiates a charge cycle when the charger
CEN
PEN1 PEN2 DC INPUT CURRENT LIMIT
EXPECTED INPUT TYPE
CHARGER CURRENT LIMIT**
0 0 0 95mA 100mA USB 1556(1.5V / R
ISET
)
0 0 1 475mA 500mA USB 1556(1.5V / R
ISET
)
0 1 X* 2000(1.5V / R
PSET
) AC adapter 1556(1.5V / R
ISET
)
1 X* 0 Off USB suspend Off
1 0 1 475mA 500mA USB Off
1 1 1 2000(1.5V / R
PSET
) AC adapter Off
Table 1. DC Input Current and Charger Current-Limit Select
*
X = Don’t care.
**
The maximum charge will not exceed the DC Input current.
TOGGLE CEN OR
REMOVE AND
RECONNECT AC
ADAPTER/USB
CHARGER OFF
CHG = HIGH-Z
I
BAT
= 0mA
TEMPERATURE
SUSPEND
I
BAT
= 0mA
CHG = PREVIOUS STATE
ANY STATE
TIMER > t
PREQUAL
ANY CHARGING STATE
CEN = 1 OR REMOVE AND
RECONNECT AC
ADAPTER/USB
THERMISTOR
TOO HOT OR TOO COLD
TIMER = SUSPENDED
THERMISTOR
TEMPERATURE OK
TIMER = RESUMED
V
BAT
> 3V
SET TIMER = 0
V
BAT
< 2.82V
SET TIMER = 0
I
BAT
< I
CHG-MAX
x 7.5%
AND V
BAT
= 4.2V
SET TIMER = 0
I
BAT
> I
CHG-MAX
x 12%
SET TIMER = 0
TIMER > t
TOP-OFF
V
BAT
= < 4.1V
SET TIMER = 0
TIMER > t
FST-CHG
(TIMER SUSPENDED IF I
BAT
< I
CHG-MAX
x
20% WHILE V
BAT
< 4.2V)
PREQUALIFICATION
CHG = 0V
I
BAT
= I
CHG-MAX
/ 10
CEN = 0
SET TIMER = 0
DONE
CHG = HIGH-Z
I
BAT
= 0mA
FAST CHARGE
CHG = 0V
I
BAT
= I
CHG-MAX
TOP - OFF
CHG = HIGH - Z
FAULT
POK = 0V
CHG = BLINK AT 1Hz
I
BAT
= 0mA
Figure 4. Charger State Diagram