NTE972
Integrated Circuit
3–Terminal Positive Voltage Regulator, 24V
The NTE972 fixed–voltage regulator is a monolithic integrated circuit in a TO220 type package de-
signed for use in a wide variety of applications including local, on–card regulation. This regulator em-
ploys internal current limiting, thermal shutdown, and safe–area compensation. With adequate heat-
sinking it can deliver output currents in excess of 1.0 ampere. Although designed primarily as a fixed
voltage regulator, this device can be used with external components to obtain adjustable voltages and
currents.
Features:
D
Output Current in Excess of 1.0 Ampere
D
No External Components Reguired
D
Internal Thermal Overload Protection
D
Internal Short–Circuit Current Limiting
D
Output Transistor Safe–Area Compensation
Absolute Maximum Ratings:
(T
A
= +25°C unless otherwise specified)
Input Voltage, V
in
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Vdc
Power Dissipation (T
A
= +25°C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Derate above +25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4mW/°C
Power Dissipation (T
C
= +25°C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Derate above +75°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
200mW/°C
Thermal Resistance, Junction–to–Ambient, R
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C/W
Thermal Resistance, Junction–to–Case, R
thJC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5°C/W
Operating Junction Temperature Range, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Storage Junction Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Electrical Characteristics:
(V
in
= 33V, I
O
= 500mA, T
J
= 0° to +125°C unless otherwise specified)
Parameter
Output Voltage
Symbol
V
O
Reg
line
Reg
load
T
J
= +25°C
5mA
≤
I
O
≤
1A, P
O
≤
15W, 27V
≤
V
in
≤
38V
Line Regulation
T
J
= +25°C, Note 1
T
J
= +25°C, Note 1
27V
≤
V
in
≤
38V
30V
≤
V
in
≤
36V
Load Regulation
5mA
≤
I
O
≤
1.5A
250mA
≤
I
O
≤
750mA
Test Conditions
Min
23
Typ
24
Max
25
Unit
V
V
mV
mV
mV
mV
22.8 24.0 25.2
–
–
–
–
31
14
60
25
480
240
480
240
Note 1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due
to heating effects must be taken into account separately. Pulse testing with low duty cycle
is used.