Data Sheet

2

Rev. 1.2, 2008-03-20

TLE 4470

use of an external voltage divider the main output voltage can be set to

V

TLE 4470 G type (PG-DSO-20 package).

V

which is proportional to the output voltage

V

series PNP transistor via a buffer.

The main output voltage

V

For the TLE 4470 GS (PG-DSO-14 package) the output voltage is fixed to 5 V.

To save energy e.g. in battery powered body electronic applications, the main regulator

can be switched off via the disable input, which causes the current consumption to drop

to 180

µA typical.

Two additional features of the TLE 4470 are an early warning comparator (can be used

e.g. to monitor the supply voltage

V

time. The TLE 4470 G (PG-DSO-20 package) has in addition an adjustable reset

switching threshold. This feature is useful with microprocessors which guarantee a safe

operation down to voltages below the internally set reset threshold of 4.65 V typical.

Two functions are included in the reset generator, a power-on-reset and an under-

voltage reset. The power-on-reset feature is necessary for a defined start of the

microprocessor when switching on the application. The reset signal is kept low for a

certain delay time after the output voltage

V

threshold. An external delay capacitor sets this delay time. The under voltage reset

circuit supervises the stand-by output voltage. In case

V

threshold the reset output is set LOW after a short reaction time. The reset LOW signal

is generated down to an output voltage

V

Figure 1

Pin Configuration (top view)

GND

GND

10

8

9

7

6

3

5

4

2

120

19

18

17

16

15

14

13

12

11

GND

DIS

D

GND

RQ

SI

AEP02151

SQ

GND

RADJ

GND

GND

ADJ2

GND

Q2

Q2

Q1

Ι

Ι

1

2

GND

7

6

3

5

4

2

114

13

12

11

10

9

8

GND

GND

DIS

SI

AEP02152

GND

D

Ι

GND

GND

RQ

SQ

Q2

Q1

PG-DSO-14

PG-DSO-20