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參數(shù)資料
| 型號： | LP3994 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 50mA CMOS Voltage Regulator with Enable Control |
| 中文描述： | 50mA的CMOS電壓調(diào)節(jié)器的使能控制 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LP3994 |
Electrical Characteristics
(Notes 2, 7) (Continued)
Unless otherwise noted, V
= 1.2, V
= V
+ 1.0V, C
= 1 μF, I
= 1 mA, C
= 1 μF. Typical values and limits ap-
pearing in normal type apply for T
J
= 25C. Limits appearing in
boldface
type apply over the full temperature range for opera-
tion, 40 to +125C. (Notes 13, 14)
Symbol
PSRR
Parameter
Conditions
Min
Typ
70
30
50
40
95
Max
Units
Power Supply Rejection Ratio
f = 100Hz, I
OUT
= 1mA to 50mA
f = 50kHz, I
OUT
= 1mA to 50mA
f = 1MHz, I
OUT
= 1mA
f = 1MHz, I
OUT
= 50mA
BW = 100Hz to 100kHz,
V
IN
= 4.2V, I
OUT
= 1mA
dB
E
n
Output noise Voltage (Note 9)
μV
RMS
T
SHUTDOWN
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Enable Control Characteristics
I
EN
Maximum Input Current at
V
EN
Input
V
IL
Low Input Threshold
V
IH
High Input Threshold
Timing Characteristics
T
ON1
Turn On Time (Note 9)
T
ON2
Transient
Response
Load Transient Response
|
δ
V
OUT
|
160
20
C
V
EN
= 0.0V and V
IN
= 5.5V
0.015
μA
V
IN
= 2.5V to 5.5V
V
IN
= 2.5V to 5.5V
0.4
V
V
1.2
10 to 90% of V
OUT(NOM)
(Note 10)
To 95% Level (Note 11)
10
35
20
100
20
μS
Line Transient Response |
δ
V
OUT
|
Figure 1
(Note 9)
mV
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 (T
) is dependant on the maximum operating junction temperature (T
J(max-op)
), the maximum power dissipation (P
D(max)
), and
the junction to ambient thermal resistance in the application (
θ
JA
). This relationship is given by :-
T
A(max)
= T
J(max-op)
(P
D(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 V
OUT
to rise from 10 to 90% of V
OUT(nom)
.
Note 11:
Time from V
EN
= 1.2V to V
OUT
= 95%(V
OUT(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:
C
IN
, and C
OUT
: 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 T
J
= 25C 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
C
o
Parameter
Conditions
Min
0.7
Typ
1.0
5
Max
Units
μF
m
Output Capacitor
Capacitance(Note 15)
ESR
500
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.)
L
www.national.com
5
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PDF描述 |
|---|---|
| LP3994LD-1.5 | 50mA CMOS Voltage Regulator with Enable Control |
| LP3994LD-1.8 | 50mA CMOS Voltage Regulator with Enable Control |
| LP3994LDX-1.5 | 50mA CMOS Voltage Regulator with Enable Control |
| LP3994LDX-1.8 | 50mA CMOS Voltage Regulator with Enable Control |
| LP3994TL-1.5 | 50mA CMOS Voltage Regulator with Enable Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3994LD-1.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP3994LD-1.8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP3994TL-1.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP3994TLX-1.5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LP3994TLX-1.8 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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