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ADAU1701

3.3V

10 uF

100 nF

1 k惟

Preliminary Technical Data

amplification factor (h

FE

or beta) should be at least 100. Second,

the transistor鈥檚 collector needs to be able to dissipate the heat

generated when regulating from 3.3 V to 1.8 V. The maximum

digital current draw of the ADAU1701 is 60 mA. The equation

to determine the transistor鈥檚 minimum power dissipation specs

is as follows:

(3.3 V 鈥?1.8 V) 脳 60 mA = 90 mW

There are many transistors with these specifications available in

small packages (i.e. SOT-23 or SOT-223), such as the 2N3906 or

FZT953.

ADAU170

1

DVDD

VDRIVE

Figure 18. Voltage Regulator Design

Two specifications need to be taken into consideration when

choosing a regulator transistor. First, the transistor鈥檚 current

Rev. PrF | Page 16 of 43

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