RT8409

2

DS8409-00

September 2016

www.richtek.com

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Copyright

2016 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

SGND

Signal ground of the chip.

2

COMP

Close loop compensation node.

3

FB

Error amplifier input.

4

SENSE

Current sense input.

5, 6

DRAIN

Internal MOSFET drain.

7

NC

No internal connection.

8

VCC

Supply voltage input of the chip. For good bypass, a ceramic capacitor near the VCC pin is

required.

Typical Application Circuit

SGND

COMP

FB

RT8409

SENSE

VCC

R2

L1

D7

C4

D5

C2

R2B

R2A

C1

3

2

1

8

4

DRAIN

5, 6

C3

X

R4

R3

X

R1

D2

D4

D1

D3

F1

D8

Bootstrap diode

C5