Copyright

© ANPEC Electronics Corp.

Rev. A.5 - Apr., 2009

APL3200

www.anpec.com.tw

13

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.

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.

Typical Application Circuits (Cont.)

Designation

Description

C1

2.2

µF, 10V, X5R, 0603

Murata GRM188R61A225K

C2

2.2

µF, 6.3V, X5R, 0603

Murata GRM188R60J225K

C4

4.7

µF, 25V, X5R, 0805

Murata GRM21BR61E475K

C6

4.7

µF, 10V, X5R, 0603

Murata GRM188R61A475K

Murata website: www.murata.com

THRM

DCI

STAT2

STAT1

USEL

DC

DCLV

BATT

PON

USB

DCOK

C1

2.2

µF

EN

R2

NTC

Thermistor

10k

Ω at 25 C

Q2

55m

Ω

D1 500mA

Schottky Diode

To System

Load

Li+

Cell

500mA

100mA

R3

1k

Ω

REF

Q1

55m

Ω

C2

2.2

µF

R1

10k

Ω

OVP up to 18V

Charging up to 6V

USB

Input

R4

1k

Ω

UOK

C3

0.1

µF

R5

10k

Ω

C5

0.1

µF

Q3

55m

Ω

D2 500mA

Schottky Diode

C6

4.7

µF

C4

4.7

µF

°

Designation

Description

C1

2.2

µF, 10V, X5R, 0603

Murata GRM188R61A225K

C2

2.2

µF, 6.3V, X5R, 0603

Murata GRM188R60J225K

C4

4.7

µF, 25V, X5R, 0805

Murata GRM21BR61E475K

C6

4.7

µF, 10V, X5R, 0603

Murata GRM188R61A475K

Murata website: www.murata.com

D2 500mA

Schottky

Diode

THRM

DCI

STAT2

STAT1

USEL

DC

DCLV

BATT

PON

USB

DCOK

C1

2.2

µF

EN

R2

NTC

Thermistor

10k

Ω at 25 C

Q2

55m

Ω

D1 500mA

Schottky Diode

To System

Load

Li+

Cell

500mA

100mA

R3

1k

Ω

REF

Q1

55m

Ω

C2

2.2

µF

R1

10k

Ω

OVP up to 18V

Charging up to

6V

USB

Input

R4

1k

Ω

UOK

C3

0.1

µF

C5

0.1

µF

C6

4.7

µF

C4

4.7

µF

°