4254GA Ver la hoja de datos (PDF) - Infineon Technologies

Número de pieza

componentes Descripción

Fabricante

4254GA

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

micro controller

e.g.

VDD

C167,

XC16X

TC17xx

I/O

I/O

VREF

R1 ADJ

R2 ADJ

EN/

5 ADJ

4

ST

TLE4254GS

TLE4254EJ S

I

8

1

Q

GND

2, 3, 6, 7

VQ < VREF

Figure 6 Application circuit: Output voltage VQ lower than reference voltage VREF

Status Output feedbacked to microcontroller (version GS / EJ S)

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

according to Application circuit: Output voltage VQ lower than reference voltage VREF Status Output

feedbacked to microcontroller (version GS / EJ S) 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

16

Rev. 1.2, 2009-11-18

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