NTE NTE1900 Datasheet

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 termi­nal 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 tran­sient 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 r egulators, t he N TE1900 i s u seful i n a wide variety of other a pplications. 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
Input–Output Voltage Differential, V
Operating Junction Temperature Range, T
Storage Temperature Range, T
Lead Temperature (During Soldering, 10sec), T

D

I–VO

J

stg

L

Internally Limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Characteristics: (–25° ≤ TJ ≤ +125°C, VIN–V

= 5V, IO = 40mA, I

OUT

= 100mA,

MAX

Note 1 unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Line Regulation Reg

Load Regulation Reg

lineTA

loadTA

Thermal Regulation TA = +25°C, 10ms Pulse – 0.04 0.2 %/W
Adjustment Pin Current I
Adjustment Pin Current

∆I

Adj

Adj

Change

Reference Voltage V

Temperature Stability T
Minimum Load Current I

Maximum Output Current I

ref

S

Lmin

max

Limit

RMS Output Noise,

% of V

OUT

N TA = +25°C, 10Hz ≤ f ≤ 10kHz – 0.003 – %

Ripple Rejection Ratio RR V

Long Term Stability S TJ = +125°C, 1000 Hours – 0.3 1.0 %

= +25°C, 3V ≤ (VIN–V

3V ≤ (VIN–V

) ≤ 40V – 0.02 0.07 %/V

OUT

= +25°C, 5mA ≤ IO ≤ 1

) ≤ 40V, Note 2 – 0.01 0.04 %/V

OUT

, Note 2 – 0.1 0.5 %

MAX

5mA ≤ IO ≤ 100mA, Note 2 – 0.3 1.5 %

– 50 100 µA

5mA ≤ IL ≤ 100mA, 3V ≤ (VIN–V

OUT

) ≤ 40V,

– 0.2 5.0 µA

P ≤ 625mW
3V ≤ (VIN–V

) ≤ 40V, 5mA ≤ IO ≤ 100mA,

OUT

1.20 1.25 1.30 V

P ≤ 625mW, Note 3
–25° ≤ TJ ≤ +125°C – 0.65 – %
(VIN–V
3V ≤ (VIN–V
3V ≤ (VIN–V
VIN–V

OUT

C

ADJ

) ≤ 40V – 3.5 5 mA

OUT

) ≤ 15V – 1.5 2.5 mA

OUT

) ≤ 13V 100 200 300 mA

OUT

= 40V 25 50 150 mA

OUT

= 10V, f = 120Hz, C

= 0 – 65 – dB

ADJ

= 10µF 66 80 – 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

.500

(12.7)

Min

.100 (2.54)

Adj

V

OUT

V

IN

Seating Plane

.021 (.445) Dia Max

.050 (1.27)

.165
(4.2)
Max

.105 (2.67) Max

.205 (5.2) Max

.105 (2.67) Max