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TDA3661A

Very low dropout voltage/quiescent current adjustable voltage regulator

Philips Electronics 

Philips Semiconductors

TDA3661

Very low dropout voltage/quiescent current voltage regulator

6.2 Pin description

Table 3:

Symbol

REG

GND

n.c.

ADJ

VP

Pin description

Pin

1

2, 3, 6 and 7

4

5

8

Description

regulator output

ground [1]

not connected

feedback input

supply voltage

[1] All GND pins are connected to the lead frame and can also be used to reduce the total thermal resistance

Rth(j-a) by soldering these pins to a ground plane. The ground plane on the top side of the printed-circuit

board acts like a heat spreader.

7. 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 and telephone 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.

8. Limiting values

Table 4: Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter

Conditions

Min

VP

supply voltage

-

VP(rp)

reverse polarity supply

non-operating

-

voltage

Ptot

total power dissipation

temperature of

-

copper area is

25 °C

Tstg

storage temperature

non-operating

−55

Tamb

ambient temperature

operating

−40

Tj

junction temperature

operating

−40

Max Unit

45

V

−25

V

4.1

W

+150 °C

+125 °C

+150 °C

9. Thermal characteristics

Table 5:

Symbol

Rth(j-c)

Rth(j-a)

Thermal characteristics

Parameter

thermal resistance from junction to case

thermal resistance from junction to ambient

Conditions

to center pins; soldered

in free air; soldered

Typ

Unit

30

K/W

155

K/W

9397 750 15049

Product data sheet

Rev. 05 — 28 June 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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