2

Rev.1.3

11 -

■Block diagram

■Standard circuit

Input

Cin=

10µF/25V

Ceramic

R4=100k

7

8

C2=

0.1µF

C3=10nF

C4

Option

C1=3.3nF

3

5

Cout=

22µF/6.3V

Ceramic×2

2

1

4

6

L=10µH

ELM613DA

VIN

FB

SW

EN

GND

BS

SS

COMP

R1=12.1kΩ

1%

R2=4.7kΩ

1%

R3=15kΩ

Output=

3.3V/2A

+

+

-

-

+

-

+

Current sense

amplifier

Current

comparator

Error

amplifier

Oscillator

170kHz &

550kHz

Shutdown

comparator

VIN

FB

SW

EN

GND

BS

SS

COMP

5

8

6

7

2

1

3

4

1.5V

1.2V

Internal

regulators

5V

IN

IN<4.10V

EN

OVP

M2

85mΩ

M1

85mΩ

5V

S

R

Q

Q

OVP

1.1V

6µA

0.923V

CLK

RAMP

0.3V

-

-

+

+

-

+

SOP-8(TOP VIEW)

■Pin configuration

Pin No.

Pin name

Pin description

1

BS

High-side gate drive boost input

2

VIN

Power input

3

SW

Power switching output

4

GND

Ground

5

FB

Feedback input

6

COMP

Compensation node

7

EN

Enable input

8

SS

Soft start control input

4

3

2

1

5

6

7

8

Note: EN pin is clamped to 5.6V. If EN pin needs to be pulled-up, EN input current has to

be lower than 200μA with R4 (about 100kΩ).