MC33263 datasheet(5/12 Pages) ONSEMI | Ultra Low Noise 150 mA Low Dropout Voltage Regulator with ON/OFF Control

5 page

MC33263

http://onsemi.com

If TJmax is internally limited to 150°C, then the MC33263

can dissipate up to 595 mW @ 25

°C.

The power dissipated by the MC33263 can be calculated

from the following formula:

Ptot

+ V

in @

gnd

(Iout) ) Vin * Vout @ Iout

Vinmax +

Ptot

) V

out @ Iout

gnd )

Iout

If a 150 mA output current is needed, the ground current

is extracted from the data–sheet curves: 6.5 mA @ 150 mA.

For a MC33263NW28R2 (2.8 V), the maximum input

voltage will then be 6.48 V, a rather comfortable margin.

Typical Application – The following figure portraits the

typical

application

for

the

MC33263

where

both

input/output decoupling capacitors appear.

Figure 1. A Typical MC33263 Application with

Recommended Capacitor Values

Input

Output

1.0

10 nF

On/Off

MC33263

As for any low noise designs, particular care has to be

taken when tackling Printed Circuit Board (PCB) layout.

The following figure gives an example of a layout where

stray inductances/capacitances are minimized.

Figure 2. Printed Circuit Board

Figure 3. Copper Side Component Layout

Input

Output

ON/OFF

Differential (Vin–Vout)

MC33263

Rpull–up

This layout is the basis for an MC33263 performance

evaluation board where the BNC connectors give the user an

easy and quick evaluation mean.

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