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LP3994TL-1.5 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP3994TL-1.5
Description  50mA CMOS Voltage Regulator with Enable Control
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3994TL-1.5 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Electrical Characteristics(Notes 2, 7) (Continued)
Unless otherwise noted, V
EN = 1.2, VIN =VOUT + 1.0V, CIN = 1 µF, IOUT = 1 mA, COUT = 1 µF. Typical values and limits ap-
pearing in normal type apply for T
J = 25˚C. Limits appearing in boldface type apply over the full temperature range for opera-
tion, −40 to +125˚C. (Notes 13, 14)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
PSRR
Power Supply Rejection Ratio
f = 100Hz, I
OUT = 1mA to 50mA
70
dB
f = 50kHz, I
OUT = 1mA to 50mA
30
f = 1MHz, I
OUT = 1mA
50
f = 1MHz, I
OUT = 50mA
40
E
n
Output noise Voltage (Note 9)
BW = 100Hz to 100kHz,
V
IN = 4.2V, IOUT = 1mA
95
µV
RMS
T
SHUTDOWN
Thermal Shutdown Temperature
160
˚C
Thermal Shutdown Hysteresis
20
Enable Control Characteristics
I
EN
Maximum Input Current at
V
EN Input
V
EN = 0.0V and VIN = 5.5V
0.015
µA
V
IL
Low Input Threshold
V
IN = 2.5V to 5.5V
0.4
V
V
IH
High Input Threshold
V
IN = 2.5V to 5.5V
1.2
V
Timing Characteristics
T
ON1
Turn On Time (Note 9)
10 to 90% of V
OUT(NOM) (Note 10)
10
20
µS
T
ON2
To 95% Level (Note 11)
35
100
Transient
Response
Line Transient Response |
δV
OUT|
Figure 1 (Note 9)
20
mV
Load Transient Response
|
δV
OUT|
Figure 2 (Note 9)
70
Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All Voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage
Note 4: The human body is 100pF discharge through 1.5kW resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin.
Note 5: In applications where high power dissipation and/or poor thermal resistance is present, the maximum ambient temperature may have to be derated.
Maximum ambient temperature (TA(max)) is dependant on the maximum operating junction temperature (TJ(max-op)), the maximum power dissipation (PD(max)), and
the junction to ambient thermal resistance in the application (
θJA). This relationship is given by :-
T
A(max) =TJ(max-op) −(PD(max) x
θ
JA)
See Applications section.
Note 6: Junction to ambient thermal resistance is highly application and board layout dependent. In applications where high maximum power dissipation exists, the
thermal dissipation issues should be addressed in the board layout design.
Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.
Note 8: The device maintains the regulated output voltage without the load.
Note 9: This electrical specification is guaranteed by design.
Note 10: Time for VOUT to rise from 10 to 90% of VOUT(nom).
Note 11: Time from VEN = 1.2V to VOUT = 95%(VOUT(nom)).
Note 12: Short circuit current is measured on the input supply line at the point when the short circuit condition reduces the output voltage to 95% of its nominal value.
Note 13: CIN, and COUT: Low ESR surface mont devices used in setting electrical characteristics.
Note 14: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at TJ = 25˚C or correlated using
Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the electrical characteristics to process and
temperature variations and applying statistical process control.
Output Capacitor, Recommended Specifications
Symbol
Parameter
Conditions
Min
Typ
Max
Units
C
o
Output Capacitor
Capacitance(Note 15)
0.7
1.0
µF
ESR
5
500
m
Note 15: The capacitor tolerance should be ±30% or better over the full temperature range. The full range of operating conditions for the capacitor in the application
should be considered during device selection to ensure this minimum capacitance specification is met. X7R capacitor types are recommended to meet the full device
temperature range, however X5R, Y5V, and Z5U types may be used with careful consideration of the application and its operating conditions. (See Capacitor
Sections in Application Hints.)
www.national.com
5


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