NTE1900
Integrated Circuit
3鈥揟erminal Adjustable Positive
Voltage Regulator
Description:
The NTE1900 is an adjustable 3鈥搕erminal 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鈥檚. 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鈥搕erminal regulators.
Besides replacing fixed regulators, the NTE1900 is useful in a wide variety of other applications. Since
the regulator is 鈥渇loating鈥?and sees only the input鈥搕o鈥搊utput 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鈥揙utput Voltage Differential, V
I
鈥揤
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Operating Junction Temperature Range, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +125擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Lead Temperature (During Soldering, 10sec), T
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300擄C
1
2
