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參數(shù)資料
| 型號(hào)： | LP3985IBPX-2.8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator |
| 中文描述： | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.1 V DROPOUT, PBGA5 |
| 封裝： | 0.900 MM HEIGHT, MICRO, SMD-5 |
| 文件頁數(shù)： | 6/17頁 |
| 文件大小： | 570K |
| 代理商： | LP3985IBPX-2.8 |
Electrical Characteristics
(Continued)
Unless otherwise specified: V
= V
+ 0.5V, C
= 1 μF, I
= 1mA, C
OUT
= 1 μF, C
BYPASS
= 0.01μF. Typical values
and limits appearing in standard typeface are for T
= 25C. Limits appearing in
temperature range for operation, 40C to +125C. (Note 7) (Note 8)
Symbol
Parameter
Conditions
Typ
Limit
Units
Min
Max
T
ON
Turn-On Time
(Note 11)
Output Noise Voltage(Note 12)
C
BYPASS
= 0.01 μF
200
μs
e
n
BW = 10 Hz to 100 kHz,
C
OUT
= 1μF
C
BP
= 0
30
μVrms
Output Noise Density
230
nV/
I
EN
V
IL
Maximum Input Current at EN
Maximum Low Level Input
Voltage at EN
Minimum High Level Input
Voltage at EN
Output Capacitor
V
EN
= 0.4 and V
IN
= 6.0
V
IN
= 2.5 to 6.0V
±
1
nA
V
0.4
V
IH
V
IN
= 2.5 to 6.0V
1.4
V
C
OUT
Capacitance
ESR
1
5
20
500
μF
m
C
C
TSD
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
160
20
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may 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:
Additional information on lead temperature and pad temperature can be found in National Semiconductor Application Note (AN-1112).
Note 4:
The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using 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 364mW rating for SOT23-5
appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150C, for T
J
, 70C for T
A
, and 220C/W for
θ
JA
.
More power can be dissipated safely at ambient temperatures below 70C . Less power can be dissipated safely at ambient temperatures above 70C. The Absolute
Maximum power dissipation can be increased by 4.5mW for each degree below 70C, and it must be derated by 4.5mW for each degree above 70C.
Note 5:
The human body model is 100pF discharged through 1.5k
resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each
pin.
Note 6:
Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating for
SOT23-5 appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125C, for T
J
, 70C for T
A
, and 220C/W for
θ
JA
into (Note 4) above. More power can be dissipated at ambient temperatures below 70C . Less power can be dissipated at ambient temperatures above 70C.
The maximum power dissipation for operation can be increased by 4.5mW for each degree below 70C, and it must be derated by 4.5mW for each degree above
70C.
Note 7:
All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with T
J
= 25C or correlated using
Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations
and applying statistical process control.
Note 8:
The target output voltage, which is labeled V
OUT(nom)
, is the desired voltage option.
Note 9:
An increase in the load current results in a slight decrease in the output voltage and vice versa.
Note 10:
Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply
for input voltages below 2.5V.
Note 11:
Turn-on time is time measured between the enable input just exceeding V
IH
and the output voltage just reaching 95% of its nominal value.
Note 12:
The output noise varies with output voltage option. The 30μVrms is measured with 2.5V voltage option. To calculate an approximated output noise for other
options, use the equation: (30μVrms)(X)/2.5, where X is the voltage option value.
10136408
FIGURE 1. Line Transient Input Test Signal
L
www.national.com
6
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