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TLE4253E

Low Dropout Voltage Tracking Regulator

Infineon Technologies 

TLE4253

Application Information

VBAT

Main µC supply, e.g.

I TLE4271-2 Q

TLE4278

TLE4470

etc.

GND

VREF

µC, e.g. C167

VDD

I/O

EN/

5 ADJ

1

Q

TLE 4253 G

I

8

GND

2, 3, 6, 7

4

FB

R1FB

R2FB

VQ > VREF

Figure 5 Application circuit: Output voltage VQ higher than reference voltage VREF

For output voltages higher than the reference voltage, the voltage divider has to be applied between the feedback

and the output according to Figure 5. The equation for the output voltage with respect to the reference voltage is

given by:

VQ

=

VR

EF

⋅





R-----1---F---RB----2-+--F---RB----2---F---B--

Keep in mind that the input voltage has to be at minimum equal to the output voltage plus the dropout voltage of

the regulator.

With a given reference voltage VREF, the desired output voltage VQ and the resistor value R1FB, the resistor value

for R2FB is given by:

R2FB

=

R1FB

⋅





V-----Q--V---–--R--V--E---FR---E----F-

Data Sheet

18

Rev. 1.2, 2009-11-09

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