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參數(shù)資料
| 型號： | LP3992IMFX-1.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micropower 1.5V CMOS Voltage Regulator with Shutdown Control |
| 中文描述： | 1.5 V FIXED POSITIVE REGULATOR, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 245K |
| 代理商： | LP3992IMFX-1.5 |
Electrical Characteristics
(Continued)
Note 3:
The package can pass MSL (moisture sensitivity level) 1 at 260C.
Additional information on lead temperature can be obtained from National Semiconductor web pages
http://www.national.com/packaging/general.html
http://www.national.com/packaging/plastic.html
Note 4:
The Maximum power dissipation of the device is dependant on the maximum allowable junction temperature for the device and the ambient temperature.
This relationship is given by the formula
P
D
= (T
J
- T
A
)/
θ
JA
Where T
J
is the junction temperature, T
A
is the ambient temperature, and
θ
JA is the junction-to-ambient thermal resistance. The Maximum Power dissipation across
the device related to the operational conditions can be calculated using the formula
P
D
= (V
IN(MAX)
- V
OUT(MAX)
) * (I
OUT(MAX)
)
Substituting the device values gives the max power dissipation = (5.2V - 1.5V)(0.03) = 0.111W. This figure for Maximum power dissipation can be used to derive the
maximum ambient temperature. For the SOT23-5 package
θ
= 220C/W, thus for this device the maximum temperature difference, (T
- T
), is 24.4C, (0.111 *
220). This gives the maximum ambient temperature for operation as 100.6C, (125 - 24.4). Similarly the numbers for the absolute maximum case can be derived
using a figure of 150C for the junction temperature.
Note 5:
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 6:
The device maintains the regulated output voltage without the load.
Note 7:
This electrical specification is guaranteed by design.
Note 8:
Time for V
OUT
to rise from 50 to 85% of V
OUT(nom)
. (figure 1)
Note 9:
Time from V
SD
= 1.15V to V
OUT
= 95%(V
OUT(nom)
). (figure 1)
Note 10:
Time for V
OUT
to fall from 85 to 50% of V
OUT(nom)
. (figure 1)
Note 11:
Time from V
SD
= 0.4V to V
OUT
= 5%(V
OUT(nom)
. (figure 1)
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:
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
Parameter
Conditions
Typ
Limit
Units
Min
1.0
5
Max
C
o
Output Capacitor
Capacitance(Note 14)
ESR
μF
m
500
Note 14:
Capacitor types recommended are X7R, Y5V, and Z5U. X7R tolerance is quoted as 15% over temperature.
20041203
FIGURE 1. Figure 1. T
on
/T
off
Timing Diagram
L
www.national.com
4
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