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TDA3668

Very low dropout voltage/quiescent current 5 V regulator with overvoltage switch off

Philips Electronics 

Philips Semiconductors

Very low dropout voltage/quiescent current

5 V regulator with overvoltage switch off

Preliminary specification

TDA3668AT

FUNCTIONAL DESCRIPTION

The TDA3668AT is a fixed 5 V regulator which can deliver

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

an SO8 package. 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 operational down to very low supply

voltages and at lower voltages 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

38 Ω. This is very attractive as the ESR of an electrolytic

capacitor increases strongly at low temperatures

(no expensive tantalum capacitor is required).

A load dump circuit (see Fig.3) and an overvoltage

protection circuit is built-in which will switch off the IC

above 28 V (typical value).

handbook, halfpage

50

VP

(V)

14.4

tr

tf

Fig.3 Load dump pulse.

MGS590

t (ms)

LIMITING VALUES

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

SYMBOL

VP

PARAMETER

supply voltage

VP(rp)

Ptot

Tstg

Tamb

Tj

reverse polarity supply voltage

total power dissipation

storage temperature

ambient temperature

junction temperature

CONDITIONS

operating

load dump

non-operating

temperature of PCB ground

plane is 25 °C

non-operating

operating

MIN.

−

−

−

−

−55

−40

−40

MAX.

24

50

−25

4.1

UNIT

V

V

V

W

+150

°C

+125

°C

+150

°C

THERMAL CHARACTERISTICS

SYMBOL

Rth(j-a)

Rth(j-c)

PARAMETER

thermal resistance from junction to ambient

thermal resistance from junction to case

CONDITIONS

in free air; soldered

to centre pins; soldered

VALUE

125

30

UNIT

K/W

K/W

QUALITY SPECIFICATION

In accordance with “SNW-FQ-611E”.

2000 Feb 01

4

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