SC1566 查看數據表（PDF） - Semtech Corporation

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SC1566

Very Low Dropout 3.0 Amp Regulator With Enable

Semtech Corporation 

SC1566

POWER MANAGEMENT

Applications Information (Cont.)

Using this figure, and assuming TA(MAX) = 85°C, we can

calculate the maximum thermal impedance allowable to

maintain TJ ≤ 150°C (see page 7):

( ) ( ) R = TH(J−A )(MAX )

TJ(MAX ) − TA (MAX )

PD(MAX )

=

150 − 85

1.81

= 36°C / W

R TH(J−C)(MAX ) = 3°C / W and R TH(C−S) = 0°C / W,

therefore R TH(S−A )(MAX ) = 33°C / W

This should be achievable for the TO-263 package using

pcb copper area to aid in conducting the heat away from

the device, such as a large (~2 squ. inch) pad connected

to the tab of the device. Internal ground/power planes

and air flow will also assist in removing heat. For higher

power dissipations it may be necessary to use a small

heatsink and the TO-220 package.

Co=2.2uF, Stable Region:

Unstable Region:

3mA

30mA

Load

300mA

0.001

0.01

0.1

1

ESR(Ohms)

3A

10

Co=22uF, Stable Region:

Unstable Region:

3mA

30mA

Load

300mA

0.001

0.01

0.1

1

ESR(Ohms)

3A

10

 2005 Semtech Corp.

Co=220uF, Stable Region:

Unstable Region:

3mA

30mA

Load

300mA

0.001

0.01

0.1

1

ESR(Ohms)

3A

10

Figure 1. Phase-margin Contour Plot

8

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