NTE935
Integrated Circuit
3Terminal Adjustable Positive Voltage Regulator
1.2V to 32V, 5A
Description:
The NTE935 is an adjustable 3terminal positive voltage regulator in a TO3 type package capable
of supplying in excess of 5A over a 1.2V to 32V output range. This device is exceptionally easy to
use.
A unique feature of the NTE935 is its time dependent current limiting. The current limit circuitry allows
peak currents of up to 12A to be drawn from the regulator for short periods of time.
Also included on the chip are thermal overload protection and safe area protection for the power transistor.
Overload protection remains functional even if the adjustment pin is accidently disconnected.
Normally, no capacitors are needed unless the device is situated far from the input filter capacitors
in which case an input bypass is needed. An optional output capacitor can be added to improve tran-
sient response. The adjustment terminal can be bypassed to achieve very high ripple rejections ratios
which are difficult to achieve with standard 3terminal regulators.
Features:
D
Guaranteed 7A Peak Output Current
D
Guaranteed 5A Output Current
D
Adjustable Output Down to 1.2V
D
Line Regulation Typically 0.005%/V
D
Load Regulation Typically 0.1%
D
Guaranteed Thermal Regulation
D
Output is Short Circuit Protected
D
Current Limit Constant with Temperature
D
Standard 3Lead Transistor Package.
Absolute Maximum Ratings:
Power Dissipation, P
D
Internally limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
InputOutput Voltage Differential, V
IO
35V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature Range, T
J
0
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 10 seconds), T
L
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance, JunctiontoCase, R
thJC
1.0
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance, JunctiontoAmbient, R
thJA
35
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (+25
C
TJ
+150
C, V
IN
V
OUT
= 5V and I
OUT
= 2.5A, Note 1
unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Line Regulation
3V
(V
IN
V
OUT)
35V, I
L
= 0.01A, Note 2
0.02
0.06
%/V
3V
(V
IN
V
OUT)
35V, I
L
= 0.01A, T
A
= +25
C, Note 2
0.005
0.03
%/V
Load Regulation
10mA
I
OUT
5A, Note 2
0.3
1.0
%
10mA
I
OUT
5A, T
A
= +25
C, Note 2
0.1
0.5
%
Thermal Regulation
Pulse = 20ms, T
J
= +25
C
0.002
0.02
%/W
Adjustment Pin Current
45
100
A
Adjustment Pin Current Change
10mA
I
L
5A, 3V
(V
IN
V
OUT
)
35V
0.2
5.0
A
Reference Voltage
3
(V
IN
V
OUT
)
35V, 10mA
I
OUT
5A, P
50W,
Note 3
1.19
1.24
1.29
V
Temperature Stability
T
MIN
T
J
T
MAX
1
%
Minimum Load Current
(V
IN
V
OUT
) = 35V
3.5
10
mA
Current Limit
(V
IN
V
OUT
)
10V
5.0
8.0
A
(V
IN
V
OUT
)
30V
1.0
A
RMS Output Noise, % of V
OUT
T
J
= +25
C, 10Hz
f
10kHz
0.003
%
Ripple Rejection Ratio
V
OUT
= 10V, f = 120Hz
60
dB
C
ADJ
= 10
F
60
75
dB
Long Term Stability
T
J
= +125
C
0.3
1.0
%
Note 1. Power dissipation is internally limited, these specifications are applicable for power dissipations
up to 50W.
Note 2. Regulation is measured at constant junction temperature. Changes in output voltage due
to heating effects are taken into account separately by thermal regulation.
Note 3. Selected devices with tightened tolerance reference voltage.
1.187 (30.16)
.875 (22.2)
Dia Max
.665
(16.9)
.430
(10.92)
Seating Plane
.040 (1.02)
.312 (7.93) Min
.135 (3.45) Max
.350 (8.89)
V
IN
V
OUT
/Case
Adjust
.215 (5.45)
.525 (13.35) R Max
.156 (3.96) Dia
(2 Holes)
.188 (4.8) R Max
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