APL3200
Typical Application Circuits (Cont.)
3. Full-Featured Circuit. Overvoltage protection MOSFET (Q2) on DC withstands up to 18V from the AC adapter, but
disables charging at inputs over 6.4V. Output switch-over MOSFET (Q1) disconnects the battery from the
system load when input power is applied. The input can power the system through D1, D2, Q2, and Q3 when
either USB or AC power is present.
OVP up to 18V
Charging up to 6V
C4
4.7µF
Q3
55mΩ
USB
Input
D2 500mA
Schottky Diode
D1 500mA
Schottky Diode
R4
1kΩ DC
Q2
55mΩ
C5
0.1µF
R5
10kΩ
C6
4.7µF
DCOK
DCLV
UOK
USB
500mA
100mA
R3
1kΩ
USEL
DCI
C1
2.2µF
PON
BATT
EN
STAT1
STAT2
REF
THRM
To System
Load
Q1
55mΩ
C2
Li+
2.2µF
Cell
C3
0.1µF
Designation
Description
2.2µF, 10V, X5R, 0603
C1
Murata GRM188R61A225K
C2
2.2µF, 6.3V, X5R, 0603
Murata GRM188R60J225K
R1
10kΩ
4.7µF, 25V, X5R, 0805
C4
Murata GRM21BR61E475K
C6
4.7µF, 10V, X5R, 0603
Murata GRM188R61A475K
R2 Murata website: www.murata.com
NTC
Thermistor
10kΩ at 25°C
4. Partial-Battery Load Switching. AC adapter power is routed directly to system load, but USB power is not. When
USB power is connected, total USB current is limited to that set by USEL and system power is drawn from the
battery through D2.
OVP up to 18V
Charging up to
6V
C4
4.7µF
USB
Input
D1 500mA
Schottky Diode
R4
1kΩ DC
Q2
55mΩ
C5
0.1µF
DCOK
DCLV
UOK
C6
4.7µF
USB
PON
BATT
EN
STAT1
STAT2
REF
500mA
100mA
R3
1kΩ
USEL
DCI
THRM
C1
2.2µF
To System
Load
Q1
55mΩ
D2 500mA
Schottky
Diode
C2
Li+
2.2µF
Cell
C3
0.1µF
R1
10kΩ
Designation
Description
2.2µF, 10V, X5R, 0603
C1
Murata GRM188R61A225K
C2
2.2µF, 6.3V, X5R, 0603
Murata GRM188R60J225K
4.7µF, 25V, X5R, 0805
C4
Murata GRM21BR61E475K
C6
4.7µF, 10V, X5R, 0603
Murata GRM188R61A475K
Murata website: www.murata.com
R2
NTC
Thermistor
10kΩ at 25°C
Copyright © ANPEC Electronics Corp.
13
Rev. A.5 - Apr., 2009
www.anpec.com.tw