2000 Feb 01

4

Philips Semiconductors

Preliminary specification

Very low dropout voltage/quiescent current

3.3 V voltage regulator with enable

TDA3673

FUNCTIONAL DESCRIPTION

The TDA3673 is a fixed 3.3 V regulator which can deliver

output currents up to 100 mA. The regulator is available in

an SO8 package with fused centre pins connected to the

lead frame. The regulator is intended for portable, mains,

telephone and automotive applications. To increase the

lifetime of batteries, a specially built-in clamp circuit keeps

the quiescent current of this regulator very low, also in

dropout and full load conditions.

The regulator remains operating down to very low supply

voltages and below it switches off.

A temperature protection circuit is included, which

switches off the regulator output at a junction temperature

above 150

°C.

A new output circuit guarantees the stability of the

regulator for a capacitor output circuit with an ESR up to

20

Ω. If only a 100 nF capacitor is used, the regulator is

the ESR of an electrolytic capacitor increases strongly at

low temperatures (no expensive tantalum capacitor is

required).

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

THERMAL CHARACTERISTICS

QUALITY SPECIFICATION

In accordance with

“SNW-FQ-611E”.

SYMBOL

PARAMETER

CONDITIONS

MIN.

MAX.

UNIT

supply voltage

TDA3673T

−

33

V

TDA3673AT

−

45

V

reverse polarity supply voltage

non-operating

−−25

V

total power dissipation

temperature of copper area

is 25

°C

−

4.1

W

storage temperature

non-operating

−55

+150

°C

ambient temperature

operating

TDA3673T

−40

+85

°C

TDA3673AT

−40

+125

°C

junction temperature

operating

−40

+150

°C

SYMBOL

PARAMETER

CONDITIONS

VALUE

UNIT

thermal resistance from junction to ambient

in free air; soldered

125

K/W

thermal resistance from junction to case

to centre pins; soldered

30

K/W