TLE4254 데이터 시트보기 (PDF) - Infineon Technologies

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TLE4254

High Accuracy Low Dropout Voltage Tracking Regulator

Infineon Technologies 

TLE4254

Application Information

VBAT

Main µC supply

I

e.g.

Q

TLE4271-2

TLE4471

TLE6368...

GND

VREF

micro controller

e.g.

VDD

C167,

XC16X

TC17xx

I/O

EN/

5 ADJ

1

Q

TLE4254GA

TLE4254EJ A

I

8

4

FB

GND

2, 3, 6, 7

R1FB

R2FB

VQ > VREF

Figure 7 Application circuit: Output voltage VQ higher than reference voltage VREF (version GA / EJ A

only)

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

and the output according to Application circuit: Output voltage VQ higher than reference voltage VREF

(version GA / EJ A only). 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

17

Rev. 1.2, 2009-11-18

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