Datasheet

MAX9736

Mono/Stereo High-Power Class D Amplifier

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Pin Description

PIN NAME FUNCTION

1, 2 OUTL- Left-Channel Negative Speaker Output

3 BOOT Charge-Pump Output. Connect a 1μF charge-pump holding capacitor from BOOT to PVDD.

4 MONO Mono Select. Set MONO high for mono mode, low for stereo mode.

5 FBL Left-Channel Feedback. Connect feedback resistor between FBL and INL to set amplifier gain.

6 INL Stereo Left-Channel Inverting Input. In mono mode, INL is the inverting audio input for the mono amplifier.

7, 8, 17 N.C. No Connection. Not internally connected. OK to connect to PGND.

9 MUTE Mute Input. Drive MUTE low to place the device in mute mode.

10 SHDN Shutdown Input. Drive SHDN low to place the device in shutdown mode.

11 REGEN

Internal Regulator Enable Input. Connect REGEN to SHDN

to enable the internal regulator. Drive REGEN

low to disable the internal regulator, and supply the device with an external 5V supply on VS. See the

Power-Supply Sequencing section.

12 COM Internal 2V Bias. Bypass COM to AGND with a 1μF capacitor.

13, 14 AGND Analog Ground

15 REG Internal Regulator Output. Bypass REG to AGND with a 1μF capacitor.

16 VS

5V Regulator Supply. Bypass VS to AGND with a 1μF capacitor. If REGEN is low, the internal regulator is

disabled, and an external 5V supply must be connected to VS. See the Power-Supply Sequencing

section.

18 INR

Stereo Right-Channel Inverting Audio Input. In mono mode, INR is the inverting audio input for the

uncommitted preamplifier (see the Mono Configuration section for more details).

19 FBR Right-Channel Feedback. Connect feedback resistor between FBR and INR to set amplifier gain.

20 MOD

Output Modulation Select. Sets the output modulation scheme:

MOD

= Low, classic PWM/fixed-frequency mode

MOD

= High, filterless modulation/spread-spectrum mode

21 C1N Charge-Pump Flying-Capacitor Negative Terminal

22 C1P Charge-Pump Flying-Capacitor Positive Terminal

23, 24 OUTR- Right-Channel Negative Speaker Output

25, 26 OUTR+ Right-Channel Positive Speaker Output

27, 30 PVDD

Power Supply. Bypass each PVDD pin to ground with 0.1μF capacitors. Also, use a single 220μF

capacitor between PVDD and PGND.

28, 29 PGND Power Ground

31, 32 OUTL+ Left-Channel Positive Speaker Output

— EP Exposed Pad. Must be externally connected to PGND.