Datasheet
MAX8600/MAX8601
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
6 _______________________________________________________________________________________
PIN
MAX8600
MAX8601
NAME
FUNCTION
12, 13 12, 13 DC
DC Input Supply. Connect DC to a 4.5V to 7V charging source. Bypass DC to GND with a 1µF
or larger capacitor. DC takes priority over USB when both are present (MAX8601). Both DC
inputs should be connected together externally.
14 14 FLT
Fault Status Output. FLT goes low when either the prequal timer or the fast-charge timers
expire and the battery voltage is not above the required threshold. Clear the fault by raising
EN or removing input power.
— 9 USB
USB Input Source. Connect to a USB port. Bypass USB to GND with a 1µF or larger capacitor.
— 6 USEL
USB Charge-Select Input. Logic input that determines the maximum charge current drawn
from the USB input. I
BAT
= 95mA when USEL = low, and I
BAT
= 475mA when USEL = high.
— — EP Exposed Pad. Connect to the GND plane for optimum thermal dissipation.
Pin Description (continued)
ANY STATE
FAULT
CHG = HIGH
FLT = LOW
V
BAT
> 3V
SET TIMER = 0s
R
THM
> 3.97kΩ AND
R
THM
< 28.7kΩ
R
THM
> 3.97kΩ AND
R
THM
< 28.7kΩ
R
THM
< 3.97kΩ OR
R
THM
> 28.7kΩ
R
THM
< 3.97kΩ OR
R
THM
> 28.7kΩ
I
BAT
< 112.5 / R
SETI
AND VOLTAGE MODE
SET TIMER = 0s
V
IN
< 4.1V OR
V
IN
< 7.5V OR
V
IN
< V
BAT
OR
EN HIGH
V
BAT
< 3V AND
PREQUAL
TIMEOUT
I
BAT
> 112.5 / R
SETI
AND FAST-CHARGE
TIMEOUT
TOP-OFF
TIMEOUT
OFF
POK = HIGH, CHG = HIGH, FLT = HIGH
I
BAT
= 0A
EN LOW AND
POWER-GOOD
SET TIMER = 0s
PREQUAL
POK = LOW, CHG = HIGH
I
BAT
= 150 / R
SETI
DONE
POK = LOW, CHG = HIGH
I
BAT
= 0A
TOP-OFF
POK = LOW, CHG = HIGH
FAST-CHARGE
POK = LOW, CHG = LOW
I
BAT(DC)
= 1500 / R
ISET
I
BAT(USB)
= 100mA / 500mA
THM OUT OF RANGE
POK = PREVIOUS STATE
CHG = PREVIOUS STATE
I
BAT
= 0A
PREQUAL TIMER HELD
THM OUT OF RANGE
POK = PREVIOUS STATE
CHG = PREVIOUS STATE
I
BAT
= 0A
FAST-CHARGE TIMER HELD
I
BAT
< 172.5/R
SETI
AND VOLTAGE MODE
SET TIMER = 0s
V
BAT
< 2.82V
SET TIMER = 0s
V
BAT
< 4.05V
SET TIMER = 0s
Figure 1. Charger State Diagram