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參數(shù)資料
| 型號： | LP3997 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Micropower 250mA CMOS LDO Regulator with Error Flag / Power-On-Reset |
| 中文描述： | 微功耗250mA的CMOS LDO穩(wěn)壓器，錯誤旗/上電復(fù)位 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 279K |
| 代理商： | LP3997 |
Electrical Characteristics
(Continued)
Unless otherwise noted, V
=950mV, V
= V
+ 1.0V, C
IN
= 2.2 μF, I
= 1 mA, C
=2.2 μF and C
= 0.1 μF.
Typical values and limits appearing in normal type apply for T
J
= 27C. Limits appearing in
boldface
type apply over the full
temperature range for operation, 40 to +125C. (Note 11)
Symbol
Parameter
Conditions
Typ
Limit
Units
Min
2
Max
V
HYST
V
OL
I
OFF
I
DELAY
Timing Characteristics
t
ON
Hysteresis
ErrorOutput low Voltage
Error Output High Leakage
Delay Pin Current Source
V
IN
Rising or Falling
I
SINK
= 2mA
ERROR = V
OUT(NOM)
V
OUT
>
95% V
OUT(NOM)
%V
OUT
V
μA
μA
0.4
2
2.2
Turn On Time (Note 8)
To 95% Level
w/o C
NOISE
C
NOISE
= 0.1μF
150
2
250
μs
ms
mV
Transient
Response
Line Transient Response |
δ
V
OUT
| T
rise
= T
fall
= 30μs (Note 8)
δ
V
IN
= 600mV
T
rise
= T
fall
= 1μs (Note 8)
I
OUT
= 1mA to 150mA
8
TBA
(pk - pk)
Load Transient Response
|
δ
V
OUT
|
70
80
mV
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 model is 100pF discharged through a 1.5k
resistor into each pin. The machine model is a 200pF capacitor discharged directly into each
pin.
Note 5:
The maximum ambient temperature (T
A(max)
) is dependant on the maximum operating junction temperature (T
J(max-op)
= 125C), the maximum power
dissipation of the device in te application (P
D(max)
θ
JA
), as given by the
following equation: T
A(max)
= T
J(max-op)
- (
θ
JA
D(max)
).
Note 6:
Junction to ambient thermal resistance is dependant on the application and board layout. In applications where high maximum power dissipation is possible,
special care must be paid to thermal dissipation issues in board design.
Note 7:
The device maintains the regulated output voltage without the load.
Note 8:
This electrical specification is guaranteed by design.
Note 9:
Short circuit current is measured on the input supply line at the point when the short circuit condition reduces the output voltage to 5% of its nominal value.
Note 10:
Enable Pin has 6M
typical, resistor connected to GND.
Note 11:
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
0.7
5
Max
C
o
Output Capacitor
Capacitance(Note 12)
ESR
1.0
μF
m
500
Note 12:
The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered when selecting
a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R,
Y5V, and Z5U can also be used. (See capacitor characteristics section in Application Hints)
L
www.national.com
5
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| LP3997MM-3.3 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3997MM-3.3/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3997MM-3.3/NOPB | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| LP3997MMX-3.3/NOPB | 功能描述:IC REG LDO 3.3V .25A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.1V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:300mA 電流 - 限制（最?。?420mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) |
| LP3999ITL-1.5 | 制造商:Texas Instruments 功能描述:LDO Regulator Pos 1.5V 0.15A 5-Pin uSMD T/R |
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