DATA SHEET
Preliminary specification
Supersedes data of 1999 Nov 22
File under Integrated Circuits, IC01
2000 Feb 01
INTEGRATED CIRCUITS
TDA3675
Low dropout voltage/quiescent
current 8.5 V voltage regulator with
enable
2000 Feb 01
2
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
FEATURES
Fixed 8.5 V, 100 mA regulator with enable function
Supply voltage range up to 33 V (45 V)
Very low quiescent current of 15
A (typical value)
Very low dropout voltage
High ripple rejection
Very high stability:
Electrolytic capacitors: Equivalent Series Resistance
(ESR) < 38
at I
REG
25 mA
Other capacitors: 100 nF at 200
A
I
REG
100 mA.
Pin compatible family TDA3672 to TDA3676
Protections:
Reverse polarity safe (down to
-
25 V without high
reverse current)
Negative transient of 50 V (R
S
= 10
, t < 100 ms)
Able to withstand voltages up to 18 V at the output
(supply line may be short-circuited)
ESD protection for all pins
DC short-circuit safe to ground and V
P
of the
regulator output
Temperature protection at T
j
> 150
C.
GENERAL DESCRIPTION
The TDA3675 is a fixed 8.5 V voltage regulator with very
low dropout voltage and quiescent current, which operates
over a wide supply voltage range.
The IC is available as:
TDA3675T: V
P
33 V,
-
40
C
T
amb
+85
C and
SO8 package (non-automotive)
TDA3675AT: V
P
45 V,
-
40
C
T
amb
+125
C and
SO8 package (automotive).
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
P
supply voltage
regulator on
TDA3675T
3
14.4
33
V
TDA3675AT
3
14.4
45
V
I
q
quiescent supply current
V
P
= 14.4 V; I
REG
= 0 mA;
V
I(EN)
= 5 V
-
15
30
A
Regulator output
V
REG
regulator output voltage
V
I(EN)
= 5 V
11.5 V
V
P
22 V; I
REG
= 0.5 mA
8.16
8.5
8.84
V
9.5 V
V
P
45 V; I
REG
= 0.5 mA
8.08
8.5
8.92
V
V
P
= 14.4 V;
0.5 mA
I
REG
100 mA
8.08
8.5
8.92
V
V
REG(drop)
dropout voltage
V
P
= 8.0 V; I
REG
= 50 mA
-
0.18
0.3
V
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA3675T
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
TDA3675AT
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
2000 Feb 01
3
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
BLOCK DIAGRAM
handbook, halfpage
MGL829
REGULATOR
2, 3, 6, 7
1
GND
8
REG
VP
5
EN
BAND GAP
TDA3675
THERMAL
PROTECTION
Fig.1 Block diagram.
PINNING
Note
1. All GND pins are connected to the lead frame and can
also be used to reduce the total thermal resistance
R
th(j-a)
by soldering these pins to a ground plane.
The ground plane on the top side of the Printed-Circuit
Board (PCB) acts like a heat spreader.
SYMBOL
PIN (SO8)
DESCRIPTION
REG
1
regulator output
GND
2, 3, 6 and 7
ground; note 1
n.c.
4
not connected
EN
5
enable input
V
P
8
supply voltage
handbook, halfpage
1
2
3
4
8
7
6
5
MGL830
TDA3675
VP
GND
GND
GND
EN
n.c.
GND
REG
Fig.2 Pin configuration.
2000 Feb 01
4
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
FUNCTIONAL DESCRIPTION
The TDA3675 is a fixed 8.5 V regulator which can deliver
output currents up to 100 mA. The regulator is available in
an SO8 package with fused centre pins connected to the
lead frame. 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 operating down to very low supply
voltages and below this voltage 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
20
. If only a 100 nF capacitor is used, the regulator is
fully stable when I
REG
> 200 mA. 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).
THERMAL CHARACTERISTICS
QUALITY SPECIFICATION
In accordance with
"SNW-FQ-611E".
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
supply voltage
TDA3675T
-
33
V
TDA3675AT
-
45
V
V
P(rp)
reverse polarity supply voltage
non-operating
-
-
25
V
P
tot
total power dissipation
temperature of PCB ground
plane is 25
C
-
4.1
W
T
stg
storage temperature
non-operating
-
55
+150
C
T
amb
ambient temperature
operating
TDA3675T
-
40
+85
C
TDA3675AT
-
40
+125
C
T
j
junction temperature
operating
-
40
+150
C
SYMBOL
PARAMETER
CONDITIONS
VALUE
UNIT
R
th(j-a)
thermal resistance from junction to ambient
in free air; soldered
125
K/W
R
th(j-c)
thermal resistance from junction to case
to centre pins; soldered
30
K/W
2000 Feb 01
5
Philips Semiconductors
Preliminary specification
Low dropout voltage/quiescent current
8.5 V voltage regulator with enable
TDA3675
CHARACTERISTICS
V
P
= 14.4 V; T
amb
= 25
C; V
I(EN)
= 5 V; measured in test circuit of Fig.3; unless otherwise specified.
Notes
1. The regulator output will follow V
P
if V
P
< V
REG
+ V
REG(drop)
.
2. Limiting values as applicable for device type:
a) TDA3675T: V
P
33 V,
-
40
C
T
amb
+85
C.
b) TDA3675AT: V
P
45 V,
-
40
C
T
amb
+125
C.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply voltage: pin V
P
V
P
supply voltage
regulator operating; note 1
TDA3675T
3
14.4
33
V
TDA3675AT
3
14.4
45
V
I
q
quiescent current
V
P
= 14.4 V; I
REG
= 0 mA; V
I(EN)
= 0 V
-
4
15
A
V
P
= 14.4 V; I
REG
= 0 mA; V
I(EN)
= 5 V
-
15
30
A
9.5 V
V
P
22 V; I
REG
= 10 mA
-
0.2
0.5
mA
9.5 V
V
P
22 V; I
REG
= 50 mA
-
1.4
2.5
mA
Enable input: pin EN
V
I(EN)
enable input voltage
enable off; V
REG
0.8 V
-
1.0
-
+1.0
V
enable on; V
REG
8.0 V
3.0
-
18
V
I
I(EN)
enable input current
V
I(EN)
= 5 V
-
0.3
-
A
Regulator output: pin REG; note 2
V
REG
output voltage
11.5 V
V
P
22 V; I
REG
= 0.5 mA
8.16
8.5
8.84
V
9.5 V
V
P
45 V; I
REG
= 0.5 mA;
T
amb
125
C
8.08
8.5
8.92
V
0.5 mA
I
REG
100 mA;
T
amb
125
C
8.08
8.5
8.92
V
V
REG(drop)
dropout voltage
V
P
= 8.0 V; I
REG
= 50 mA;
T
amb
85
C
-
0.18
0.3
V
V
REG(stab)
long-term stability voltage
-
20
-
mV/1000 h
V
REG(line)
line input regulation voltage 11.5 V
V
P
16 V; I
REG
= 0.5 mA
-
1
10
mV
10.5 V
V
P
22 V; I
REG
= 0.5 mA
-
1
30
mV
7 V
V
P
45 V; I
REG
= 0.5 mA;
T
amb
125
C
-
1
50
mV
V
REG(load)
load output regulation
voltage
0.5 mA
I
REG
50 mA;
T
amb
125
C
-
10
50
mV
SVRR
supply voltage ripple
rejection
f
i
= 120 Hz; V
i(ripple)
= 1 V (RMS);
I
REG
= 0.5 mA
50
60
-
dB
I
REG(crl)
current limit
V
REG
> 8.0 V
0.17
0.25
-
A
I
LO(rp)
output leakage current at
reverse polarity
V
P
=
-
15 V; V
REG
0.3 V
-
1
500
A
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