Philips TDA3668AT Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA3668AT

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

Preliminary specification
Supersedes data of 1999 Nov 23
File under Integrated Circuits, IC01

2000 Feb 01

Philips Semiconductors Preliminary specification

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

FEATURES

• Fixed 5 V, 100 mA regulator

• Supply voltage range up to 50 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 nF at 200 µA ≤ I

REG

≤ 25 mA

REG

≤ 100 mA.

• Pin compatible family TDA3661 to TDA3676

• 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 protected for all pins
– DC short-circuit safe to ground and VP of regulator

– Temperature protection at Tj> 150 °C
– Load dump protection, which will switch off V

GENERAL DESCRIPTION

The TDA3668AT is a fixed 5 V voltage regulator with a
very low dropout voltage and quiescent current, which
operates over a wide supply voltage range.

The regulator should use a supply voltage of VP≤ 50 V.
It has a temperature range of −40 °C ≤ T
and it is available as an automotive version in an
SO8 package.

TDA3668AT

(supply line may be short-circuited)

output

during load dump.

≤ +125 °C,

amb

REG

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

I

q

supply voltage regulator on 3 14.4 24 V

load dump; t ≤ 50 ms; t

quiescent supply current VP= 14.4 V; I

REG

≥ 2.5 ms −−50 V

r

=0mA − 15 30 µA

Regulator output

V

REG

V

REG(drop)

output voltage 8 V ≤ VP≤ 22 V; I

6V≤V
T

amb

V

P

T

amb

dropout voltage VP= 4.5 V; I

≤24 V; I

P

≤ 125 °C

= 14.4 V;0.5 mA ≤ I

≤ 125 °C

REG

= 0.5 mA 4.8 5.0 5.2 V

REG
REG

= 0.5 mA;

≤ 100 mA;

REG

4.75 5.0 5.25 V

4.75 5.0 5.25 V

=50mA − 0.18 0.3 V

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TDA3668AT 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
5 V regulator with overvoltage switch off

BLOCK DIAGRAM

handbook, halfpage

V

P

8

BAND GAP

TDA3668AT

REGULATOR

PROTECTION

2, 3, 6, 7

GND

THERMAL

MGS588

TDA3668AT

1

REG

Fig.1 Block diagram.

PINNING

SYMBOL PIN DESCRIPTION

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

P

8 supply voltage

Note

1. For the SO8 package all GND pins are connected to
theleadframeandcanalsobeusedtoreducethetotal
thermal resistance R

by soldering these pins to a

th(j-a)

ground plane. The ground plane on the top side of the
Printed-Circuit Board (PCB) acts like a heat spreader.

handbook, halfpage

REG

1
2

TDA3668AT

3

GND

4

n.c.

MGS589

Fig.2 Pin configuration.

V

8

P

GNDGND

7

GND

6

n.c.

5

2000 Feb 01 3

Philips Semiconductors Preliminary specification

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

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.

Theregulatorremains 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).

handbook, halfpage

50

V

P

(V)

14.4

TDA3668AT

MGS590

t

r

t

f

t (ms)

A load dump circuit (see Fig.3) and an overvoltage
protection circuit is built-in which will switch off the IC

Fig.3 Load dump pulse.

above 28 V (typical value).

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage operating − 24 V

load dump − 50 V
V
P

P(rp)
tot

reverse polarity supply voltage non-operating −−25 V
total power dissipation temperature of PCB ground

− 4.1 W

plane is 25 °C
T

stg

T

amb

T

j

storage temperature non-operating −55 +150 °C
ambient temperature −40 +125 °C
junction temperature operating −40 +150 °C

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R
R

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

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

QUALITY SPECIFICATION

In accordance with

“SNW-FQ-611E”

.

2000 Feb 01 4

Philips Semiconductors Preliminary specification

Very low dropout voltage/quiescent current

TDA3668AT

5 V regulator with overvoltage switch off

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 2
V

REG

V

REG(drop)

V

REG(stab)

∆V

REG(line)

∆V

REG(load)

SVRR supply voltage ripple

I

REG(crl)

I

LO(rp)

=25°C; measured in test circuit of Fig.4; unless otherwise specified.

amb

P

supply voltage regulator operating; note 1 3 14.4 24 V

load dump; t
overvoltage protection; regulator

≤ 50 ms; tr≥ 2.5 ms −−50 V

f

24 28 − V

switched off

quiescent current VP= 4.5 V; I

V

= 14.4 V; I

P

6V≤V
6V≤V

≤22 V; I

P

≤22 V; I

P

output voltage 8 V ≤ VP≤ 22 V; I

6V≤V
T

amb

≤24 V; I

P

≤ 125 °C

0.5 mA ≤ I
T

≤ 125 °C

amb

dropout voltage VP= 4.5 V; I

T

≤ 85 °C

amb

=0mA − 10 −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

REG

REG

= 0.5 mA;

REG

≤ 100 mA;

= 50 mA;

4.75 5.0 5.25 V

4.75 5.0 5.25 V

− 0.18 0.3 V

long-term stability voltage − 20 − mV/1000 h
line input regulation voltage 8 V ≤ VP≤ 22 V; I

load output regulation
voltage

rejection
current limit V
output leakage current at

7V≤V
T

amb

0.5 mA ≤ I
T

amb

f

P(ripple)

I

REG

REG

VP= −15 V; V

≤22 V; I

P

≤ 85 °C

≤ 50 mA;

REG

≤ 125 °C

= 120 Hz; V

= 0.5 mA

> 4.5 V 0.17 0.25 − A

REG

= 0.5 mA − 130mV

REG
REG

= 0.5 mA;

− 150mV

− 10 50 mV

P(ripple)(rms)

=1V;

50 60 − dB

≤ 0.3 V − 1 500 µA

reverse polarity

Notes

1. The regulator output will follow V

if VP<V

P

REG+VREG(drop)

.

2. Limiting values as applicable for device type: VP≤ 50 V and −40 °C ≤ T

2000 Feb 01 5

≤ +125 °C.

amb