TLE4253 데이터 시트보기 (PDF) - Infineon Technologies

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TLE4253

Low Dropout Voltage Tracking Regulator

Infineon Technologies 

TLE4253

Application Information

VBAT

Main µC supply, e.g.

I

TLE4271-2 Q

TLE4278

TLE4470

etc.

GND

µC, e.g. C167

VDD

I/O

VREF

R1ADJ

R2ADJ

EN/

5 ADJ

1

Q

TLE 4253 G

I

8

GND

2, 3, 6, 7

4

FB

VQ < VREF

Figure 4 Application circuit: Output voltage VQ lower than reference voltage VREF

In order to obtain a lower output voltage VQ at the tracker output than the reference voltage VREF, a voltage divider

according to Figure 4 has to be used. The output voltage VQ then calculates:

VQ

=

VR

E

F

⋅





R-----1---A----DR----J2---+-A---D-R---J-2---A----D----J

With a given reference voltage VREF, the desired output voltage VQ and the resistor value R1ADJ, the resistor value

for R2ADJ is given by:

R2ADJ

=

R1ADJ

⋅





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

Taking into consideration also the effect of the internal EN/ADJ pull-down resistor, the external resistor divider’s

R2ADJ has to be selected to:

R 2 A D J ,s e l e c t

=





-RR----P-2--u-A-l--l-D-D--J-o---⋅w---R-n---,P-m--u--i-ln-l--D-–---o--Rw----n2---,A-m---D-i--n-J

Data Sheet

17

Rev. 1.2, 2009-11-09

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