NTE NTE1942

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, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Peak Input Voltage (10ms), Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60V
In–Out Operating Differential Voltage, ∆Vi–o . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32V
Output Current, Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited
Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +150°C
Maximum Thermal Resistance, Junction–to–Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . +3°C/W
Maximum Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . +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
(Pin3)
Id
Vi = 20V, TJ = +25°C
–
4.2
9.2
mA
Output Noise Voltage
eN
Vo = Vref, Io = 10mA, B = 1MHz
–
80
–
µV
Vi = 20V, Io = 10mA, TJ = +25°C
2.65
2.77
2.85
V
–
–0.25
–
mV/°C
–
–1.5
–
mV/°C
2.85
–
36
V
VOLTAGE REGULATION LOOP
Reference Voltage (Pin4)
Vref
Average Temperature
Coefficient of
Reference Voltage
∆Vref
∆
∆T
Output Voltage Range
Vo
Vi = 20V, TJ = –25° to +125°C
Io = 10mA
TJ = +125° to +150°C
Io = 10mA, TJ = +25°C
∆Vo
Vo
∆Io =2.0A, Note 1
–
0.15
1.0
%
∆Io =1.5A, Note 1
–
1.0
0.5
%
Supply Voltage Rejection
Ratio
SVR
Vo = 5V, Io = 500mA, ∆Vi = 100Vpp,
f = 100Hx, Note 2
60
70
–
dB
Line Regulation
∆Vi
∆Vo
Vo = 5V, Io = 500mA, Vi = 8V to 18V,
TJ = +25°C
54
70
–
dB
Voltage Load Regulation
Output Impedance
Zo
Drop–out Voltage between
Pin1 and Pin5
Bias Current at Pin4
Average Temperature
Coefficient (Pin4)
Io = 1.5A,
I4
∆Vo
≤ 2%
Vo
Ω
1.5 x 10–3
Vi = 10V, Vo = Vref, Io = 0.5A,
f = 100Hz
–
2.0
2.5
V
–
3
10
µA
–
–0.5
–
%/°C
–
0.45
–
V
–
0.03
–
%/°C
Io = 0.5A
–
1.4
–
%
Io = 1.0A
–
1.0
–
%
Io = 1.5A
–
0.9
–
%
2.0
2.5
3.6
A
TJ = +25°C
∆I4
∆TDI4
CURRENT REGULATION LOOP
Current Limit Sense
Voltage between
Pin5 and Pin2
VSC
Vi = 10V, Vo = Vref, TJ = +25°C
Average Temperature
Coefficient of VSC
Current Load Regulation
Short Circuit Current
∆Io
Io
Isc
Vi = 10V,
∆ o = 3V
∆V
Vi – Vo = 14V,
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.
Pin Connection Diagram
VOUT
VIN
Reference
Limiting
GND
.408 (10.37
Max
0.45 (1.37) Max
.114 (2.9)
.619
(15.72)
Max
.896
(22.76)
Max
.364
(9.25)
Max
.850
(21.6)
Max
.135 (3.45)
.150 (3.81)
1
3
2
5
4
.182 (4.62) Max
.182 (4.62)