Apm8601, New prod uc t functional description – Diodes APM8601 User Manual
Page 7
APM8601
DUAL CHANNEL SINGLE CELL LINEAR LITHIUM BATTERY
CHARGER WITH 28V OVP and PROGRAMMABLE CHARGE
TIMER
APM8601
Document number: DS35138 Rev. 1 - 2
7 of 14
December 2010
© Diodes Incorporated
NEW PROD
UC
T
Functional Description
APM8601 is a linear Li-Ion battery charger device for single-cell applications. It has dual power inputs (DC and USB) and the
charge currents can be programmed with the R
SETI
resistor and/or the USEL pin. The device also incorporates several safety
features, such as charge timers, battery temperature monitoring and internal thermal limiting.
Functional State Diagram
ANY STATE
EN = HIGH
OR V
IN
< V
BAT
OR V
IN
< 4.0V
OR V
IN
> 7.5V
EN = LOW
AND V
IN
> V
BAT
AND V
IN
> 4.0V
AND V
IN
< 7.5V
V
BAT
> 3V
Reset Timer
V
BAT
< 2.82V
Reset Timer
I
BAT
< 112.5 / R
SETI
Reset Timer
I
BAT
> 172.5 / R
SETI
Reset Timer
R
THM
< 315
Ω
OR (R
THM
> 3.94k
Ω
AND R
THM
< 28.3k
Ω)
(R
THM
> 315
Ω
AND R
THM
< 3.94k
Ω)
OR R
THM
> 28.3k
Ω
R
THM
< 315
Ω
OR (R
THM
> 3.94k
Ω
AND R
THM
< 28.3k
Ω)
(R
THM
> 315
Ω
AND R
THM
< 3.94k
Ω)
OR R
THM
> 28.3k
Ω
Time out
V
BAT
< 4.05V
Reset Timer
I
BAT
> 112.5 / R
SETI
AND Time out
V
BAT
< 3V
AND Time out
DISABLE
POK 1 FLT 1 CHG 1
I
BAT
0A
PREQUAL
POK 0 FLT 1
CHG 1
I
BAT
150 / R
SETI
Timer Hold
THM
POK 0 FLT 1
CHG 1 I
BAT
0A
TOP-OFF
POK 0 FLT 1 CHG 1
CHARGE
POK 0 FLT 1 CHG 0
I
BAT
(USB)
USEL Setting
I
BAT
(DC)
1500 / R
SETI
DONE
POK 0 FLT 1 CHG 1
I
BAT
0A
Timer Hold
THM
POK 0 FLT 1
CHG 0 I
BAT
0A
FAULT
POK 0 FLT 0
CHG 1 I
BAT
0A