RT9108NL

2

DS9108NL-01

June 2012

www.richtek.com

©

Copyright

2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

SD

Shutdown Logic Input for Audio Amp (High = outputs enabled). TTL logic levels

with compliance to AVCC.

2

FAULT

Open Drain Output used to Display Short Circuit Fault Status. Voltage compliant

to AVCC. Short circuit faults can be set to auto recovery by connecting FAULT pin

to SD pin.

3

LINP

Positive Audio Input for Left Channel. Biased at 2V.

4

LINN

Negative Audio Input for Left Channel. Biased at 2V.

5

GAIN0

Gain Select Least Significant Bit.

6

GAIN1

Gain Select Most Significant Bit.

7

AVCC

Analog Supply Input.

8,

29 (Exposed Pad)

AGND

Analog Ground. Connect to the thermal pad. The exposed pad must be soldered

to a large PCB and connected to AGND for maximum power dissipation.

9

GVDD

High Side FET Gate Drive Supply. Nominal voltage is 4.6V.

10

PLIMIT

Power Limit Level Adjustment.

11

RINN

Negative Audio Input for Right Channel. Biased at 2V.

12

RINP

Positive Audio Input for Right Channel. Biased at 2V.

13, 16, 27

NC

No Internal Connection.

14

MUTE

Mute Logic Input for Audio Amp (Low = outputs enabled).

15

PVCCR

Power Supply Input for Right Channel H-Bridge. Right channel and left channel

power supply inputs are connected internally.

17

BSPR

Bootstrap I/O for Right Channel. Positive high side FET.

18

OUTPR

Class-D H-Bridge Positive Output for Right Channel.

19, 24

PGND

Power Ground for H-Bridges.

20

OUTNR

Class-D H-Bridge Negative Output for Right Channel.

21

BSNR

Bootstrap I/O for Right Channel. Negative high side FET.

22

BSNL

Bootstrap I/O for Left Channel. Negative high side FET.

23

OUTNL

Class-D H-Bridge Negative Output for Left Channel.

25

OUTPL

Class-D H-Bridge Positive Output for Left Channel.

26

BSPL

Bootstrap I/O for Left Channel. Positive high side FET.

28

PVCCL

Power Supply Input for Left Channel H-Bridge. Right channel and left channel

power supply inputs are connected internally.