NTE NTE309K Datasheet
NTE309K
Integrted Circuit
Voltage Regulator
Description:
The NTE309K is a complete 5V regulator fabricated on a single silicon chip. It is designed for local
regulation on digital logic cards, eliminating the distribution problems associated with single–point
regulation. With the TO3 power package, the available output current is greater than 1A.
The regulator is essentially blowout proof. Current limiting is included to limit the peak output current
to a safe value. In addition, the thermal shutdown is provided to keep the IC from overheating. If internal dissipation becomes too great, the regulator will shut down to prevent excessive heating.
Considerable effort was expended to make these devices easy to use and to minimize the number
of external components. It is not necessary to bypass the output, although this does improve transient
response somewhat. Input bypassing is needed, however, if the regulator is located very far from the
filter capacitor of the power supply. Stability is also achieved by methods that provide very good rejection of load or line transients as are usually seen with TTL logic.
Although designed primarily as a fixed–voltage regulator, the output can be set to voltages above 5V,
as shown below. It is also possible to use the circuits as the control element in precision regulators,
taking advantage of the good current–handling capability and the thermal overload protection.
Features:
D Specified to be compatible, worst case, with TTL and DTL
D Output current in excess of 1A
D Internal thermal overload protection
D No external components required
Absolute Maximum Ratings:
Input Voltage, V
Power Dissipation, P
Operating Junction Temperature Range, T
Storage Temperature Range, T
IN
D
opr
stg
Typical Thermal Resistance, Junction–to–Case (Note 1), R
Lead Temperature (Soldering, 10 seconds), T
L
Internally Limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0°C to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65°C to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
thJC
35V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5°C/W. . . . . . . . . . . . . . . . . . . . . . .
+300°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. Without a heat sink, the thermal resistance of the TO–3 package is approximately 35°C/W.
With a heat sink,
Electrical Characteristics: (Note 2)
Parameter Test Conditions Min Typ Max Unit
Output Voltage TJ = +25°C 4.8 5.05 5.2 V
Line Regulation TJ = +25°C, 7 ≤ VIN ≤ 25V – 4.0 50 mV
Load Regulation TJ = +25°C 5mA ≤ I
Output Voltage 7 ≤ VIN ≤ 25V, 5mA ≤ I
≤ 1.5A – 15 100 mV
OUT
OUT
≤ I
MAX
, P ≤ P
MAX
4.75 – 5.25 V
Quiescent Current 7V ≤ VIn ≤ 25V – 5.2 10 mA
Quiescent Current Change
7V ≤ VIN ≤ 25V – – 0.5 mA
5mA ≤ I
OUT
≤ I
MAX
– – 0.8 mA
Output Noise Voltage TA = +25°C 10Hz ≤ f ≤ 100kHz – 40 – µV
Long Term Stability – – 20 mV
Ripple Rejection TJ = +25°C 50 – – dB
Note 2. Unless otherwise specified, these specifications apply 0°C ≤ TJ ≤ +125°C VIN = 10V; and
I
= 0.5A. I
OUT
Pin Connection Diagram
= 1.0A and P
MAX
MAX
= 20W.
.350 (8.89)
.135 (3.45) Max
.875 (22.2)
Dia Max
Seating
Plane
2
1
Case/GND
Output
Input
.215 (5.45)
.430
(10.92)
.312 (7.93) Min
V
OUT
V
IN
.040 (1.02)
1.187 (30.16)
.665
(16.9)
.156 (3.96) Dia
(2 Holes)
.188 (4.8) R Max
.525 (13.35) R Max
GND/Case
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