LM2936Z-3.3 datasheet(6/10 Pages) NSC

Part #	LM2936Z-3.3

Description	Ultra-Low Quiescent Current 3.3V Regulator

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Manufacturer	NSC [National Semiconductor (TI)]

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Typical Performance Characteristics (Continued)

Peak Output Current

Line Transient Response

10132417

10132419

Ripple Rejection

Load Transient Response

10132421

10132422

Output Impedance

10132424

Applications Information

Unlike other PNP low dropout regulators, the LM2936 re-

mains fully operational to 40V. Owing to power dissipation

characteristics of the available packages, full output current

cannot be guaranteed for all combinations of ambient tem-

perature and input voltage. As an example, consider an

LM2936Z-3.3 operating at 25˚C ambient. Using the formula

for maximum allowable power dissipation given in (Note 3) ,

we find that P

Dmax = 641 mW at 25˚C. Including the small

contribution of the quiescent current to total power dissipa-

tion the maximum input voltage (while still delivering 50 mA

output current) is 15.3V. The LM2936Z-3.3 will go into ther-

mal shutdown if it attempts to deliver full output current with

an input voltage of more than 15.3V. Similarly, at 40V input

and 25˚C ambient the LM2936Z-3.3 can deliver 15 mA maxi-

mum.

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