[AP3603]

015000004-E-02

2015/07

- 1 -

1.

General Description

The AP3603 is a dual output step-up DC-DC controller. The output voltage can be set up to 60V by an

external feedback resistor. A wide input range of 6.4V to 20V is available, which is possible to realize a high

power boost source from the battery or the other power sources. The AP3603 supports either 200W×2ch dual

outputs or 400W×1ch dual phase single output. PWM switching frequency is set from 40kHz to 500kHz by

an external resistor. As the protective functions, it has output over voltage protection and over current

protection. The AP3603 is housed in a space-saving 20-pin HTSSOP package.

2.

Features



Input Voltage Range

6.4 to 20V



Oscillation Frequency Setting Range

40k to 500kHz（Set by external resistor）



8V Gate Driver for External N-channel MOSFET（ON resistance : 3Ω)



Over Temperature Protection



Output Over Voltage Protection



Quasi-Foldback Over Current Protection



Accuracy of Feedback Voltage

+3% /-2 % (Tj=-40～145℃)



Dual Output or Dual Phase Single Output Application is Selectable



Package

20-pin HTSSOP

Dual Output Application

Dual Phase Application

Applications

Input

Voltage

Output

Voltage

Output

Current

Output

Power

Circuit

Power Amplifier

12V

20V

CH-1 7.5A

CH-2 7.5A

CH-1 150W

CH-2 150W

Dual Output

Booster

200W class

6.4V

12V

CH-1 17A

CH-2 17A

CH-1 204W

CH-2 204W

Dual Output

Booster

400W class

6.4V

12V

34A

400W

Dual Phase Single Output

High Power Dual Output Step-Up DC-DC Controller

AP3603

1

1

2

2

3

3

4

4

5

5

6

6

D

D

C

C

B

B

A

A

Title

Num ber

Revision

Size

A4

Date:

2014/09/12

Sheet

of

File:

C:\Users\..\AP3603_140912.SchDoc

Drawn By :

Vin

PWON

C1

Vout

L1

R1

R2

L2

R3

R4

C2

C4

C5

C6

C7

C8

C9

R8

R9

R10

R11

D1

D2

M1

M2

R7

R12

V8

FB2

CC2

SS

GND2

PWON

RT

GND1

RSP1

RSP2

RSN1

RSN2

FSYN

DRV1

DRV2

VDD

V4

CC1

FB1

MDC

1

1

2

2

3

3

4

4

5

5

6

6

D

D

C

C

B

B

A

A

Title

Num ber

Revision

Size

A4

Date:

2014/09/12

Sheet

of

File:

C:\Users\..\AP3603do_140912.SchDoc

Drawn By :

Vin

PWON

C1

CH-1 Vout

L1

R1

R2

L2

R3

R4

R5

R6

C2

C3

C4

C5

C6

C7

C8

C9

R8

R9

R10

R11

D1

D2

M1

M2

R7

R12

V8

FB2

CC2

SS

GND2

PWON

RT

GND1

RSP1

RSP2

RSN1

RSN2

FSYN

DRV1

DRV2

VDD

V4

CC1

FB1

MDC

CH-2 Vout