NTE NTE1942 Datasheet
NTE1942
Integrated Circuit
Positive Adjustable Voltage Regulator,
2.85V to 36V, 2A
Description:
The NTE1942 is an integrated circuit for voltage and current programmable regulation. Current limiting, power limiting, thermal shutdown, and input overvoltage protection (up to 60V) make the
NTE1942 virtually blowout proof. The NTE1942 can be used to replace fixed voltage regulators when
high output voltage precision is required.
Features:
D Adjustable Output Current Up to 2A (Guaranteed Up to TJ = +150°C)
D Adjustable Output Voltage Down to 2.85V
D Input Overvoltage Protection (Up to 60V, 10ms)
D Short Circuit Protection
D Output Transistor S.O.A. Protection
D Thermal Overload Protection
D Low Bias Current On Regulation Terminal
D Low Standby Current Drain
Absolute Maximum Ratings:
DC Input Voltage, V
Peak Input Voltage (10ms), V
In–Out Operating Differential Voltage, ∆V
Output Current, I
Power Dissipation, P
Storage Temperature Range, T
Operating Junction Temperature Range, T
Maximum Thermal Resistance, Junction–to–Case, R
i
i
i–o
o
tot
stg
J
thJC
Maximum Thermal Resistance, Junction–to–Ambient, R
thJA
40V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
60V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–55° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–25° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+3°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
+50°C/W. . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (TJ = –25° to +150°C unless otherwise specified)
∆
Parameter Symbol Test Conditions Min Typ Max Unit
GENERAL
Quiescent Drain Current
I
(Pin3)
Output Noise Voltage e
VOLTAGE REGULATION LOOP
Reference Voltage (Pin4) V
Average Temperature ∆V
Coefficient of
Reference Voltage
Output Voltage Range V
Voltage Load Regulation ∆V
V
Supply Voltage Rejection
SVR Vo = 5V, Io = 500mA, ∆Vi = 100Vpp,
Ratio
Line Regulation ∆V
∆V
Output Impedance Z
Drop–out Voltage between
Pin1 and Pin5
Bias Current at Pin4 I
Average Temperature
Coefficient (Pin4)
∆I
∆TDI
CURRENT REGULATION LOOP
d
ref
Vi = 20V, TJ = +25°C – 4.2 9.2 mA
Vo = V
N
ref
Vi = 20V, Io = 10mA, TJ = +25°C 2.65 2.77 2.85 V
Vi = 20V,
ref
T Io = 10mA
Io = 10mA, TJ = +25°C 2.85 – 36 V
o
∆Io =2.0A, Note 1 – 0.15 1.0 %
o
o
∆Io =1.5A, Note 1 – 1.0 0.5 %
f = 100Hx, Note 2
Vo = 5V, Io = 500mA, Vi = 8V to 18V,
i
o
o
= +25°C
T
J
Vi = 10V, Vo = V
f = 100Hz
I
1.5A, ≤ 2%
o =
4
TJ = +25°C – 3 10 µA
4
4
, Io = 10mA, B = 1MHz – 80 – µV
TJ = –25° to +125°C – –0.25 – mV/°C
TJ = +125° to +150°C – –1.5 – mV/°C
60 70 – dB
54 70 – dB
–3
Ω
∆V
V
o
o
, Io = 0.5A,
ref
1.5 x 10
– 2.0 2.5 V
– –0.5 – %/°C
Current Limit Sense
V
SC
Vi = 10V, Vo = V
, TJ = +25°C – 0.45 – V
ref
Voltage between
Pin5 and Pin2
Average Temperature
Coefficient of V
SC
Current Load Regulation ∆I
Vi = 10V,
o
I
o
∆Vo = 3V
Io = 0.5A – 1.4 – %
Io = 1.0A – 1.0 – %
– 0.03 – %/°C
Io = 1.5A – 0.9 – %
Short Circuit Current I
sc
Vi – Vo = 14V,
2.0 2.5 3.6 A
Pin2 and Pin5 short circuited
Note 1. A load step of 2A can be applied provided that the input–output differential voltage is lower
than 20V.
Note 2. The same performance can be maintained at higher output levels if a bypassing capacitor
is provided between Pin2 and Pin4.
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