Data Sheet

8

Rev. 1.7, 2007-03-20

TLE 4290

Application Information

Figure 4

Application Diagram

Input, Output

An input capacitor is necessary for damping line influences. A resistor of approx. 1

Ω in

series with

C

The TLE 4290 requires an output capacitor of at least 22

μF with an ESR below 5 Ω for

stability.

Power Good

The Power Good pin informs e.g. the micro-controller in case the output voltage has

fallen below a threshold of typ. 3.65 V. When the battery voltage is supplied the Power

Good signal indicates a loss of memory due to missing power. After the Memory Good

switching threshold is reached the Power Good output remains low for the Power Good

delay time. This time can be set by the user with an external capacitor at pin D according

to the requirements of the application, e.g. the time until the microcontroller is initialized

and ready to receive any information.

AES02822

Current

and

Saturation

Control

Band-

Gap-

Reference

TLE 4290

Power

Good

Control

2

5

I

4

C

C

V

BAT

C

D

47 nF

GND

R

PG

5 k

22

µF

µ-Controller

V

CC

NMI /

PORT

Internal

Reset

D

PG

Q

100

nF

C

Q2

C

Q1

1