NTE971
Linear Integrated Circuit
Voltage Regulator, Negative, 24V, 1A
Description:
The NTE924 fixedvoltage regulator is a monolithic integrated circuit in a TO220 type package de-
signed for use in a wide variety of applications including local, oncard regulation. This regulator em-
ploys internal current limiting, thermal shutdown, and safearea compensation. With adequate heat
sinking it can deliver output currents in excess of 1A. Although designed primarily as a fixed regulator,
this device can be used with external components to obtain adjustable voltages and currents.
Features:
D
No External Components Required
D
Internal Thermal Overload Protection
D
Internal ShortCircuit Current Limiting
D
Output Transistor SafeArea Compensation
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Input Voltage, V
IN
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation, P
D
Internally Limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above +25
C
15.4mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation (T
C
= +25
C), P
D
Internally Limited
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above +75
C
200mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Junction Temperature Range, T
J
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance, JunctiontoAmbient, R
thJA
65
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance, JunctiontoCase, R
thJC
5
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (V
IN
= 33V, I
O
= 500mA, T
J
= 0
to +125
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Output Voltage
V
O
T
J
= +25
C
23.0
24.0
25.0
V
5mA
I
O
1A, P
O
15W,
38V
V
IN
27V
22.8
24.0
25.2
V
Line Regulation
Reg
Line
T
J
= +25
C,
38V
V
IN
27V
31
480
mV
Note 1
36V
V
IN
30V
14
240
Load Regulation
Reg
Load
T
J
= +25
C,
5mA
I
O
1.5A
60
480
mV
Note 1
250mA
I
O
750mA
25
240
Electrical Characteristics: (V
IN
= 33V, I
O
= 500mA, T
J
= 0
to +125
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Quiescent Current
I
B
T
J
= +25
C
4.6
8.0
mA
Quiescent Current Change
I
B
38V
V
IN
27V
1.0
mA
5mA
I
O
1A
0.5
Ripple Rejection
RR
38V
V
IN
28V, f = 120Hz
54
dB
Dropout Voltage
V
IN
V
O
T
J
= +25
C, I
O
= 1A
2.0
V
Output Noise Voltage
V
n
T
A
= +25
C, 10Hz
f
100kHz
10
V/V
O
Output Resistance
r
O
f = 1kHz
20
m
ShortCircuit Current Limit
I
sc
T
A
= +25
C, V
IN
= 35V
0.2
A
Peak Output Current
I
max
T
J
= +25
C
2.2
A
Average Temperature
Coefficient of Output
Voltage
TCV
O
1.5
mV/
C
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 spearately. Pulse testing with low duty
cycle is used.
.420 (10.67)
Max
.500
(12.7)
Max
.500
(12.7)
Min
.250 (6.35)
Max
.147 (3.75)
Dia Max
.070 (1.78)
Max
.100 (2.54)
GND
V
IN
/Tab
V
OUT
.110 (2.79)
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