PAM8904E

Document number: DS41667 Rev. 2 - 2

5 of 10

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February 2022

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PAM8904E

Application Information

Charge Pump Mode Setting

The Charge Pump Mode (CPM) pins EN1 and EN2 are used to set the charge pump into mode 1x VDD, 2x VDD, 3x VDD or they can be used to put

the PAM8904E into a forced low current shutdown mode.

DIN

EN1

EN2

MODE

0

—

—

Shutdown Mode

1

0

0

Shutdown Mode

1

0

1

1x Mode

1

1

0

2x Mode

1

1

1

3x Mode

Timing Chart and Device Operation

When one or both of the EN pins are pulled high, the device enters normal operation mode. Refer to the above table for the mode selection. Once

the PAM8904E senses a valid signal on the DIN pin, the charge pump will start and provide the desired voltage on the VOUT pin and the output

drive VO1 and VO2 start to function after time tON which is typically between 470µs and 2s depending on the mode chosen. Once the input signal

on DIN is removed, the PAM8904E senses this and waits typically 42ms to ensure the signal has been removed. If there is no further valid signal

within the time period tOFF

, the PAM8904E enters into a low current standby mode.

Timing Chart

VDD Range

Mode

1.5V to 4.5V

1x, 2x and 3x

1.5V to 5.5V

1x, 2x

tON

tOFF