NTE1911
3 Terminal Adjustable Negative Voltage Regulator
1.2V to 37V, 1.5A
Description:
The NTE1911 is an adjustable 3terminal negative voltage regulator capable of supplying in excess
of 1.5A over an output voltage range of 1.2V to 37V. This regulator is exceptionally easy to apply,
requiring only 2 external resistors to set the output voltage and 1 output capacitor for frequency com-
pensation. The circuit design has been optimized for excellent regulation and low thermal transients.
Further, if features internal current limiting, thermal shutdown and safearea compensation, making
the, virtually blowoutproof against overloads.
The NTE1911 serves a wide variety of applications including local oncard regulation, program-
mableoutput voltage regulation or precision current regulation.
Features:
D
Output Voltage Adjustable from 1.2V to 37V
D
1.5A Output Current Guaranteed, 55
C to +150
C
D
Line Regulation Typically 0.01%/V
D
Load Regulation Typically 0.3%
D
Excellent Thermal Regulation, 0.002%/W
D
77dB Ripple Rejection
D
Excellent Rejection of Thermal Transients
D
50ppm/
C Temperature Coefficient
D
TemperatureIndependent Current Limit
D
Internal Thermal Overload Protection
Absolute Maximum Ratings:
Power Dissipation, P
D
20W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
InputOutput Voltage Differential, V
IO
40V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature Range, T
J
0
to +125
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (Soldering, 10 sec), T
L
300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (Note 1)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Line Regulation
Reg
line
T
A
= +25
C, 3V
V
I
V
O
40V, Note 2
0.01
0.04
%/V
3V
V
I
V
O
40V, Note 2
0.02
0.07
%/V
Note 1. Unless otherwise noted, these specifications apply: 0
T
J
+125
C, (V
I
V
O
) = 5V,
P
max
= 20W, and I
MAX
= 1.5A.
Note 2. Load and line regulation are specified at constant junction temperature. Pulse testing with
a low duty cycle is used. Change in V
O
because of heating effects is covered under the Ther-
mal Regulation specification.
Electrical Characteristics (Cont'd): (Note 1)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Load Regulation
Reg
load
V
O
5V,
T
A
= +25
C, 10mA
I
O
1.5A
15
50
mV
Note 2
10mA
I
O
3A
20
70
mV
V
O
5V,
T
A
= +25
C, 10mA
I
O
1.5A
0.3
1.0
%
Note 2
10mA
I
O
3A
0.3
1.5
%
Thermal Regulation
Reg
therm
T
A
= +25
C, Pulse = 10ms
0.003
0.04
%V
O
/W
Adjustment Pin Current
I
Adj
65
100
A
Adjustment Pin Current
Change
I
Adj
T
A
= +25
C, 10mA
I
L
1.5A,
2.5V
(V
I
V
O
)
40V, P
20W
0.2
5.0
A
Reference Voltage
V
ref
10mA
I
O
1.5A, 3V
(V
I
V
O
)
40V,
P
20W, T
A
= +25
C, Note 3
1.20
1.25
1.30
V
10mA
I
O
1.5A, 3V
(V
I
V
O
)
40V,
P
20W, Note 3
1.213
1.250
1.287
V
Temperature Stability
T
S
0
T
J
+125
C
0.6
%V
O
Minimum Load Current
I
Lmin
V
I
V
O
10V
1.5
6.0
mA
V
I
V
O
40V
2.5
10
mA
Maximum Output Current
I
max
V
I
V
O
15V, P
20W
1.5
2.2
A
Limit
V
I
V
O
40V, P
20W, T
A
= +25
C
0.15
0.4
A
RMS Noise, % of V
O
N
T
A
= +25
C, 10Hz
f
10kHz
0.003
%V
O
Ripple Rejection Ratio
RR
V
O
= 10V, f = 120Hz, C
Adj
= 0
60
dB
V
O
= 10V, f = 120Hz, C
Adj
= 10
F
66
77
dB
Long Term Stability
S
T
A
= +125
C, 1000 Hours
0.3
1.0
%/1.0k
Note 1. Unless otherwise noted, these specifications apply: 0
T
J
+125
C, (V
I
V
O
) = 5V,
P
max
= 20W, and I
MAX
= 1.5A.
Note 2. Load and line regulation are specified at constant junction temperature. Pulse testing with
a low duty cycle is used. Change in V
O
because of heating effects is covered under the Ther-
mal Regulation specification.
Note 3. C
Adj
, when used, is connected between the adjustment pin and GND.
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
OUT
V
IN
/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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