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TDA3661

Very low dropout voltage/quiescent current adjustable voltage regulator

Philips Electronics 

Philips Semiconductors

Very low dropout voltage/quiescent current

adjustable voltage regulator

Preliminary specification

TDA3661

FUNCTIONAL DESCRIPTION

The TDA3661 is an adjustable voltage regulator with an

output voltage that can be fixed by means of an external

resistor divider. The regulator 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, in dropout

and full load conditions.

The device remains operational down to very low supply

voltages (typical 2 V) and below this voltage it switches off.

A temperature protection 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

fully stable when IREG > 200 µA. This is very attractive as

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).

SYMBOL

PARAMETER

VP

supply voltage

TDA3661T

TDA3661AT

VP(rp)

Ptot

reverse polarity supply voltage

total power dissipation

Tstg

Tamb

Tj

storage temperature

ambient temperature

TDA3661T

TDA3661AT

junction temperature

CONDITIONS

MIN.

−

−

non-operating

−

temperature of copper area −

is 25 °C

non-operating

−55

operating

−40

−40

operating

−40

MAX.

UNIT

33

V

45

V

−25

V

4.1

W

+150

°C

+85

°C

+125

°C

+150

°C

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

Rth(j-c)

Rth(j-a)

thermal resistance from junction to case

thermal resistance from junction to ambient

CONDITIONS

to centre pins; soldered

in free air; soldered

VALUE

30

125

UNIT

K/W

K/W

QUALITY SPECIFICATION

In accordance with “SNW-FQ-611E”.

2000 Feb 01

4

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