NTE1900
Integrated Circuit
3–Terminal Adjustable Positive
Voltage Regulator
Description:
The NTE1900 is an adjustable 3–terminal positive voltage regulator in a TO92 type package capable
of supplying in excess of 100mA over a 1.2V to 37V output range. This device is exceptionally easy
to use and both line and load regulation are better than standard fixed regulators.
In addition to higher performance than fixed regulators, the NTE1900 offers full overload protection
available only in IC’s. Included on the chip are current limit, thermal overload protection, and safe
area protection. All overload protection circuitry remains fully functional even if the adjustment termi-
nal is 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 rejection ratios
which are difficult to achieve with standard 3–terminal regulators.
Besides replacing fixed regulators, the NTE1900 is useful in a wide variety of other applications. Since
the regulator is “floating” and sees only the input–to–output differential voltage, supplies of several
hundred volts can be regulated as long as the maximum input to output differential is not exceeded.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator,
or by connecting a fixed resistor between the adjustment and output, the NTE1900 can be used as
a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the
adjustment terminal to GND which programs the output to 1.2V where most loads draw little current.
Features:
D
Adjustable Output Down to 1.2V
D
Guaranteed 100mA Output Current
D
Line Regulation Typically 0.01%/V
D
Load Regulation Typically 0.1%
D
Current Limit Constant with Temperature
D
Eliminates the Need to Stock Many Voltages
D
80dB Ripple Rejection
Absolute Maximum Ratings:
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Input–Output Voltage Differential, V
I
–V
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Operating Junction Temperature Range, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering, 10sec), T
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Electrical Characteristics:
(–25°
≤
T
J
≤
+125°C, V
IN
–V
OUT
= 5V, I
O
= 40mA, I
MAX
= 100mA,
Note 1 unless otherwise specified)
Parameter
Line Regulation
Load Regulation
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current
Change
Reference Voltage
Temperature Stability
Minimum Load Current
Maximum Output Current
Limit
RMS Output Noise,
% of V
OUT
Ripple Rejection Ratio
Long Term Stability
I
Adj
∆I
Adj
V
ref
T
S
I
Lmin
I
max
N
RR
S
5mA
≤
I
L
≤
100mA, 3V
≤
(V
IN
–V
OUT
)
≤
40V,
P
≤
625mW
3V
≤
(V
IN
–V
OUT
)
≤
40V, 5mA
≤
I
O
≤
100mA,
P
≤
625mW, Note 3
–25°
≤
T
J
≤
+125°C
(V
IN
–V
OUT
)
≤
40V
3V
≤
(V
IN
–V
OUT
)
≤
15V
3V
≤
(V
IN
–V
OUT
)
≤
13V
V
IN
–V
OUT
= 40V
T
A
= +25°C, 10Hz
≤
f
≤
10kHz
V
OUT
= 10V, f = 120Hz, C
ADJ
= 0
C
ADJ
= 10µF
T
J
= +125°C, 1000 Hours
Symbol
Reg
line
Reg
load
Test Conditions
T
A
= +25°C, 3V
≤
(V
IN
–V
OUT
)
≤
40V, Note 2
3V
≤
(V
IN
–V
OUT
)
≤
40V
T
A
= +25°C, 5mA
≤
I
O
≤
1
MAX
, Note 2
5mA
≤
I
O
≤
100mA, Note 2
T
A
= +25°C, 10ms Pulse
Min
–
–
–
–
–
–
–
1.20
–
–
–
100
25
–
–
66
–
Typ
0.01
0.02
0.1
0.3
0.04
50
0.2
1.25
0.65
3.5
1.5
200
50
0.003
65
80
0.3
Max
0.04
0.07
0.5
1.5
0.2
100
5.0
1.30
–
5
2.5
300
150
–
–
–
1.0
Unit
%/V
%/V
%
%
%/W
µA
µA
V
%
mA
mA
mA
mA
%
dB
dB
%
Note 1. Although power dissipation is internally limited, these specifications are applicable for power
dissipations of 625mW.
Note 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty
cycle. Changes in output voltage due to heating effects are covered under the specification
for thermal regulation.
Note 3. Thermal resistance is 180°C/W junction to ambient with 0.4” leads from a PC board and
160°C/W junction to ambient with 0.125” lead length to PC board.
.135 (3.45) Min
.210
(5.33)
Max
Seating Plane
.500
(12.7)
Min
Adj
V
IN
V
OUT
.100 (2.54)
.021 (.445) Dia Max
.050 (1.27)
.165
(4.2)
Max
.105 (2.67) Max
.205 (5.2) Max
.105 (2.67) Max
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