Philips TDA3661 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA3661

Very low dropout voltage/quiescent
current adjustable voltage regulator

Preliminary specification
Supersedes data of 1999 Sep 29
File under Integrated Circuits, IC01

2000 Feb 01

Philips Semiconductors Preliminary specification

Very low dropout voltage/quiescent current
adjustable voltage regulator

FEATURES

• Output adjustable from 1.5 V to VP, 100 mA regulator

• Supply voltage range up to 33 V (45 V)

• Very low quiescent current of 15 µA (typical value)

• Very low dropout voltage

• High ripple rejection

• Very high stability:

– Electrolytic capacitors: Equivalent Series

Resistance (ESR) < 38 Ω at I

– Other capacitors: 100 nFat 200 µA ≤ I

REG

≤ 25 mA

REG

≤ 100 mA.

• Pin compatible family TDA3662 to TDA3666

• Protections:

– Reverse polarity safe (down to −25 V without high

reverse current)

– Negative transient of 50 V (RS=10Ω, t < 100 ms)

– Able to withstand voltages up to 18 V at the output

– ESD protection on all pins
– DC short-circuit safe to ground and VP of the

– Temperature protection (at Tj> 150 °C).

GENERAL DESCRIPTION

The TDA3661 is an adjustable voltage regulator with very
lowdropout voltage andquiescentcurrent, which operates
over a wide supply voltage range.

The IC is available as:

• TDA3661T: VP≤ 33 V, −40 °C ≤ T
SO8 package (non-automotive)

• TDA3661AT: VP≤ 45 V, −40 °C ≤ T
SO8 package (automotive).

(supply line may be short-circuited)

regulator output

amb

amb

TDA3661

≤ +85 °C and

≤ +125 °C and

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

supply voltage regulator on

TDA3661T 3 14.4 33 V
TDA3661AT 3 14.4 45 V

I

q

quiescent supply current VP= 14.4 V; I

=0mA − 15 30 µA

REG

Regulator; k = 4.01929 (note 1)
V

REG

V

ref

V

REG(drop)

output voltage 8 V ≤ VP≤ 22 V; I

6V≤V
V

P

0.5 mA ≤ I

≤45 V; I

P

= 14.4 V;

REG

≤ 100 mA
reference voltage VP= 14.4 V 1.181 1.244 1.306 V
dropout voltage VP= 4.5 V; I

T

amb

REG

≤ 85 °C;

= 0.5 mA 4.8 5.0 5.2 V

REG

= 0.5 mA 4.75 5.0 5.25 V

REG

4.75 5.0 5.25 V

=50mA

− 0.18 0.3 V

Note

V

1.

REG

V

k×=

ref

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA3661T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
TDA3661AT SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1

2000 Feb 01 2

Philips Semiconductors Preliminary specification

Very low dropout voltage/quiescent current
adjustable voltage regulator

BLOCK DIAGRAM

handbook, halfpage

8

V

P

REGULATOR

BAND GAP

TDA3661

PROTECTION

2, 3, 6, 7

GND

THERMAL

MGS579

TDA3661

1

REG

5

ADJ

Fig.1 Block diagram.

PINNING

SYMBOL PIN DESCRIPTION

REG 1 regulator output
GND 2, 3, 6 and 7 ground; note 1
n.c. 4 not connected
ADJ 5 feedback input
V

P

8 supply voltage

Note

1. All GND pins are connected to thelead frameand can
also be used to reduce the total thermal resistance
R

by soldering these pins to a ground plane.

th(j-a)

The ground plane on the top side of the PCB acts like
a heat spreader.

handbook, halfpage

REG

GND

n.c.

1
2
3
4

TDA3661

MGS580

V

8

P

GNDGND

7

GND

6

ADJ

5

2000 Feb 01 3

Fig.2 Pin configuration.

Philips Semiconductors Preliminary specification

Very low dropout voltage/quiescent current

TDA3661

adjustable voltage regulator

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, aspecially 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 belowthis voltageit switchesoff.

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage

TDA3661T − 33 V

TDA3661AT − 45 V
V
P

T
T

P(rp)
tot

stg
amb

reverse polarity supply voltage non-operating −−25 V
total power dissipation temperature of copper area

storage temperature non-operating −55 +150 °C
ambient temperature operating

TDA3661T −40 +85 °C

TDA3661AT −40 +125 °C
T

j

junction temperature operating −40 +150 °C

Atemperatureprotection is includedwhich switchesoff 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 I

> 200 µA. This is very attractive as

REG

the ESR of an electrolytic capacitor increases strongly at
low temperatures (no expensive tantalum capacitor is
required).

− 4.1 W

is 25 °C

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R
R

th(j-c)
th(j-a)

thermal resistance from junction to case to centre pins; soldered 30 K/W
thermal resistance from junction to ambient in free air; soldered 125 K/W

QUALITY SPECIFICATION

In accordance with

“SNW-FQ-611E”

.

2000 Feb 01 4

Philips Semiconductors Preliminary specification

Very low dropout voltage/quiescent current

TDA3661

adjustable voltage regulator

CHARACTERISTICS

VP= 14.4 V; T

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply voltage: pin V

V

P

I

q

Regulator output: pin REG; note 3
V

REG

V

REG(drop)

V

REG(stab)

V

REG(adj)

∆V

REG(line)

∆V

REG(load)

SVRR supply voltage ripple rejection f

V

ref

I

REG(crl)

I

LO(rp)

=25°C; k = 4.01929 (note 1); measured with test circuit of Fig.3; unless otherwise specified.

amb

P

supply voltage regulator operating; note 2

TDA3661T 3 14.4 33 V
TDA3661AT 3 14.4 45 V

quiescent supply current VP= 4.5 V; I

V

= 14.4 V; I

P

6V≤V
6V≤V

≤24 V; I

P

≤24 V; I

P

output voltage 8 V ≤ VP≤ 22 V; I

0.5 mA ≤ I
6V≤V

≤45 V; I

P

dropout voltage VP= 4.5 V; T

I

=50mA

REG

=0mA − 10 30 µA

REG

=0mA − 15 30 µA

REG

=10mA − 0.2 0.5 mA

REG

=50mA − 1.4 2.5 mA

REG

= 0.5 mA 4.8 5.0 5.2 V

REG

≤ 100 mA 4.75 5.0 5.25 V

REG

= 0.5 mA 4.75 5.0 5.25 V

REG

amb

≤ 85 °C;

− 0.18 0.3 V

output voltage long-term stability − 20 − mV/1000 h
output voltage adjust range 1.5 − V
line input regulation voltage 7 V ≤ VP≤ 22 V; I

7V≤V

load output regulation voltage 0.5 mA ≤ I

= 120 Hz;

i

V

i(ripple)

I

REG

≤45 V; I

P

REG

= 1 V (RMS);

= 0.5 mA

≤ 50 mA − 10 50 mV

= 0.5 mA − 130mV

REG

= 0.5 mA − 150mV

REG

50 60 − dB

V

P

reference voltage VP= 14.4 V 1.181 1.244 1.306 V
output current limit V
output leakage currentat reverse

> 4 V 0.17 0.3 − A

REG

VP= −15 V; V

= ≤ 0.3 V − 1 500 µA

REG

polarity

Notes

1. The output voltage can be calculated using the following formula: where and

V

REG

V

ref

k×= k

R1 R2+

=

---------------------­R2

R1 + R2 ≤ 100 kΩ.

2. The regulator output will follow V

if VP<V

P

REG+VREG(drop)

.

3. Limiting values as applicable for device types:
a) TDA3661T: VP≤ 33 V and −40 °C ≤ T
b) TDA3661AT: VP≤ 45 V and −40 °C ≤ T

amb

amb

≤ +85 °C.

≤ +125 °C.

2000 Feb 01 5