NTE923 & NTE923D
Integrated Circuit
Precision Voltage Regulator
Description:
The NTE923 and NTE923D are voltage regulators designed primarily for series regulator applica-
tions. By themselves, these devices will supply output currents up to 150mA; but, external transistors
can be added to provide any desired load current. The circuits feature extremely low standby current
drain, and provision is made for either linear or foldback current limiting.
These devices are also useful in a wide range of other applications such as shunt regulators, current
regulators, and temperature controllers.
Features:
D
150mA Output Current without External Pass Transistor
D
Output Currents in Excess of 10A Possible by Adding External Transistors
D
Input Voltage: 40V Max
D
Output Voltage Adjustable from 2V to 37V
D
Can be Used as Either a Linear or a Switching Regulator
Absolute Maximum Ratings:
Pulse Voltage from V+ to V (50ms)
50V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous Voltage from V+ to V
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
InputOutput Voltage Differential
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Amplifier Input Voltage
Either Input
8.5V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential
5.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current from V
Z
25mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current from V
REF
15mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation
NTE923
800mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NTE923D
660mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range
0
to +70
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range
NTE923
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NTE923D
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 4sec max)
NTE923
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NTE923D
+260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (Note 1)
Parameter
Test Conditions
Min
Typ
Max
Unit
Line Regulation
V
IN
= 12V to 15V
0.01
0.1
% V
OUT
0
T
A
+70
C
0.3
% V
OUT
V
IN
= 12V to 40V
0.1
0.5
% V
OUT
Load Regulation
I
L
= 1mA to 50mA
0.03
0.2
% V
OUT
0
T
A
+70
C
0.6
% V
OUT
Ripple Rejection
f = 50Hz to 10kHz
C
REF
= 0
74
dB
C
REF
= 5
F
86
dB
Average Temperature Coefficient of
Output Voltage
0
T
A
+70
C, Note 2
0.003 0.015
%/
C
Short Circuit Current Limit
R
SC
= 10
, V
OUT
= 0
65
mA
Reference Voltage
6.80
7.15
7.50
V
Output Noise Voltage
BW = 100Hz to 10kHz C
REF
= 0
86
V
rms
C
REF
= 5
F
2.5
V
rms
Long Term Stability
0.05
%/1000Hrs
Standby Current Drain
I
L
= 0, V
IN
= 30V
1.7
4.0
mA
Input Voltage Range
9.5
40
V
Output Voltage Range
2.0
37
V
InputOutput Voltage Differential
3.0
38
V
Thermal Resistance, Junction to Ambient
NTE923D
105
C/W
NTE923
Board mount in still air
225
C/W
Board mount in 400LF/Min Air flow
90
C/W
Thermal Resistance, Junction to Case
25
C/W
Note 1. Unless otherwise otherwise specified, T
A
= +25
C, V
IN
= V+ = V
C
= 12V, V = 0, V
OUT
= 5V,
I
L
= 1mA, R
SC
= 0, C
!
= 100pF, C
REF
= 0 and divider impedance as seen by error amplifier
10k
. Line and load regulation specifications are given for the condition of constant chip
temperature. Temperature drifts must be taken into account separately for high dissipation
conditions.
Note 2. Guaranteed by correlation to other tests.
Note 3. For metal can applications where V
Z
is required, an external 6.2V zener diode should be con-
nected in series with V
OUT
.
Pin Connection Diagram
NTE923
(Top View)
NTE923D
10
9
8
5
4
3
2
7
6
1
Freq Comp
NonInvert Input
Invert Input
Current Limit
V
C
V
out
V ()/Case
V
ref
V (+)
Current Sense
V
Z
V
out
V
C
V
ref
N.C.
V (+)
Freq Comp
N.C.
Invert Input
V ()
NonInvert Input
Current Sense
Current Limit
N.C.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
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