NTE NTE1925 Datasheet
NTE1925
3 Terminal Negative Voltage Regulator
–18V, 1.5A
Description:
The NTE1925 is a negative 3–terminal voltage regulator in a TO3 type package suitable for numerous
applications including local, on–card regulation requiring up to 1.5A. This device features thermal
shutdown and current limiting making the NTE1925 remarkably rugged.
Although designed primarily as a fixed voltage regulator, this device can be used with external components to obtain adjustable voltages and currents.
Features:
D Internal Thermal Overload Protection
D Output Transistor Safe Area Protection
D Internal Short Circuit Current Limit
D No External Components Required
Absolute Maximum Ratings:
Input Voltage, V
IN
Internal Power Dissipation (T
(TA = +25°C unless otherwise specified)
= +25°C), P
A
D
Internally Limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above 25°C 22.2mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation (T
= +25°C), P
C
D
Internally Limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above 25°C 182mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature Range, T
Storage Temperature Range, T
stg
Thermal Resistance, Junction–to–Case, R
Thermal Resistance, Junction–to–Ambient, R
Electrical Characteristics:
Parameter Symbol Test Conditions Min Typ Max Unit
Output Voltage V
Line Regulation Reg
Load Regulation Reg
(0° ≤ TJ ≤ +125°C, VIN = –33V, IO = 0.5Aunless otherwise specified)
TJ = +25°C –23 –24 –25 V
O
5mA ≤ IO ≤ 1A, –38V ≤ VIN ≤ –27V, PO ≤ 15W –22.8 –24.0 –25.2 V
lineTJ
loadTJ
= +25°C, –38V ≤ VIN ≤ –27V, Note 1 – 118 480 mV
TJ = +25°C, –36V ≤ VIN ≤ –30V, Note 1 – 70 240 mV
= +25°C, 5mA ≤ IO ≤ 1.5A, Note 1 – 150 480 mV
TJ = +25°C, 250mA ≤ IO ≤ 750mA, Note 1 – 85 240 mV
J
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
thJC
thJA
–40V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. Load and line regulation are specified at constant junction temperature. Change in VO due
to heating effects must be taken into account separately. Pulse testing with low duty cycle is
used.
Electrical Characteristics (Cont’d): (0° ≤ TJ ≤ +125°C, VIN = –27V, IO = 0.5Aunless otherwise
specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Input Bias Current I
Input Bias Current Change I
Output Noise Voltage V
Ripple Rejection Ratio RR IO = 20mA, f = 120Hz – 56 – dB
Dropout Voltage TJ = +25°C, IO = 1A – 2.0 – V
Peak Output Current IOmax TJ = +25°C 1.3 2.5 3.3 A
Average Temperature
Coefficient of Output
Voltage
TJ = +25°C – 4.5 8.0 mA
B
–38V ≤ VIN ≤ –27V – – 1.0 mA
B
5mA ≤ IO ≤ 1.5A – – 0.5 mA
TA = +25°C, f = 10Hz to 100kHz – 170 – µV
n
IO = 5mA – –1.0 – mV/°C
Note 2. Load and line regulation are specified at constant junction temperature. Change in VO due
to heating effects must be taken into account separately. Pulse testing with low duty cycle is
used.
.135 (3.45) Max
.350 (8.89)
.875 (22.2)
Dia Max
.215 (5.45)
.430
(10.92)
V
OUT
GND
Seating Plane
.040 (1.02).312 (7.93) Min
1.187 (30.16)
.665
(16.9)
.156 (3.96) Dia
(2 Holes)
.188 (4.8) R Max
.525 (13.35) R Max
VIN/Case
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