TLE4470_08 Datasheet, PDF(16/24 Page) Infineon Technologies AG – Dual Low-Drop Voltage Regulator Very low dropout

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TLE4470_08 Datasheet, PDF (16/24 Pages) Infineon Technologies AG – Dual Low-Drop Voltage Regulator Very low dropout

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TLE 4470

V I1

Band-Gap

Reference

1.35 V

TLE 4470 G

Band-Gap

Reference

1.35 V

VQ1

30 kâ¦

RADJ Vref

GND

AES02505_4470

Figure 5

Early Warning

The early warning function compares a voltage defined by the user to an internal

reference voltage. Therefore the voltage to be supervised has to be scaled down by an

external voltage divider in order to compare it to internal sense threshold (reference

voltage) which is typically 1.35 V. The sense out pin is set to low when the user defined

voltage falls below this threshold.

A typical example where this circuit can be used is to supervise the input voltage VI to

give the microprocessor a prewarning of a low battery condition.

Calculation of the voltage divider can be easily done since the sense input current can

be neglected. The equations needed for calculation are identical to the previously given

ones.

To minimize transient influences the use of a capacitor in parallel to R2 is recommended.

Like the reset output pin, the sense out pin SQ is internally connected to the stand-by

output Q1 via a 30 kâ¦ pull-up resistor. The sense out LOW signal at pin SQ is generated

down to an input voltage VI1 of 3 V typical.

Data Sheet

Rev. 1.2, 2008-03-20

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