RT9187

2

DS9187-08 August 2007

www.richtek.com

Typical Application Circuit

Function Pin Description

Figure 2. Adjustable Operation

Figure 1. Fixed Operation

Note: The value of R2 should be less than 80k to

maintain regulation.

Pin No.

RT9187-xxPQV

(Fixed)

RT9187PQV

(Adjustable)

Pin

Name

Pin Function

1

1

VIN

Supply Input.

2

2

VIN

Supply Input.

3

3

VOUT

Regulator Output.

4

4

VOUT

Regulator Output.

5

BP

Noise Reduction. Connecting a 10nF capacitor to GND to reduce

output noise.

5

ADJ

If external feedback resistors are applied, the output voltage will be:

) Volts

6

6

GND

Common Ground.

7

7

NC

No Internal Connection.

8

8

EN

Enable Input Logic, Active High. When the EN goes to a logic low, the

device is in shutdown mode.

Exposed Pad (9)

NC

No Internal Connection.

2

1

R

R

2

1

R

R

1

+

V

) Volts

VIN

GND

VOUT

RT9187

C

OUT

2.2uF

2.2uF

BP

10nF

EN

C

IN

C

BP

V

IN

V

OUT

Chip Enable

VIN

GND

VOUT

RT9187

C

OUT

2.2uF

2.2uF

ADJ

EN

C

IN

V

IN

V

OUT

R1

R2

Chip Enable