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參數(shù)資料
| 型號(hào)： | LP2950 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 100 mA Low Dropout Voltage Regulators(100mA,低壓差穩(wěn)壓器) |
| 中文描述： | 一百毫安低壓差穩(wěn)壓器（100mA的電流，低壓差穩(wěn)壓器） |
| 文件頁數(shù)： | 3/12頁 |
| 文件大小： | 297K |
| 代理商： | LP2950 |
Rev. 11/2/00
FEEDBACK
INPUT
OUTPUT
UNREGULATED DC
SHUTDOW N
GROUND
______
5V TAP
SENSE
5V @ 100mA
MAX
TO CMOS OR
TTL
REFERENCE
ERROR DETECTION
COM PARATOR
ERROR
AM PLIFIER
1.23V
FROM
CM OS OR
TTL
+
+
_
+
+
+
+
60 mV
3
7
8
1
2
6
5
4
..
60k
330k
180k
..
..
μ
..
1
F
_
LP2950 and LP2951 Block Diagram
LP2950/51
PARAMETER
CONDITIONS
(Note 2)
Min. Typ. Max.
8-Pin Versions only (Continued)
Reference Voltage
Temperature
Coefficient
Feedback Pin Bias
Current
Temperature Coefficient
Error Comparator
Output Leakage Current
V
OH
= 30V
0.01
1
Output Low Voltage
V
IN
= 4.5V
I
OL
= 400
μ
A
Upper Threshold
Voltage
Lower Threshold
Voltage
Hysteresis
(Note 8)
15
Shutdown Input
Input logic Voltage
Low (Regulator ON)
High (Regulator OFF)
2
Shut down Pin Input
Current
V
S
= 30V
675
800
Regulator Output
Current in Shutdown
Note 1:
Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 2:
Unless otherwise specified all limits guaranteed for T
J
= 25
°
C, V
IN
= 6V, I
L
= 100
μ
A and C
L
= 1
μ
F. Additional conditions for the 8-pin versions are feedback
tied to 5V tap and output tied to output sense (V
OUT
= 5V) and V
SHUTDOWN
≤
0.8V.
Note 3:
Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are
covered under the specification for thermal regulation.
Note 4
: Line regulation for the LP2951 is tested at 150
°
C for I
L
= 1mA. For I
L
= 100
μ
A and T
J
= 125
°
C, line regulation is guaranteed by design to 0.2%. See typical
performance characteristics for line regulation versus temperature and load current.
Note 5:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at
very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6:
V
REF
≤
V
OUT
≤
(V
IN
- 1V), 2.3
≤
V
IN
≤
30V, 100
μ
A
≤
I
L
≤
100 mA, T
J
≤
T
JMAX
.
Note 7:
Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To
express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V
OUT
/V
REF
= (R
1
+ R
2
)/R
2
. For example, at a programmed output
voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 8:
V
SHUTDOWN
≥
2V, V
IN
≤
30V, V
OUT
=0, Feedback pin tied to 5V Tap.
Note 9:
All typical values are not guaranteed. The value could vary from lot to lot.
LP2951
LP2950AC
LP2951AC
Min. Typ. Max.
LP2950C
LP2951C
Min. Typ. Max.
UNITS
( Note 7 )
20
20
50
ppm/°C
0.1
0.1
0.1
nA/°C
0.01
150
1
250
0.01
150
1
250
μ
A
mV
150
250
(Note 8)
40
60
40
60
40
60
mV
(Note 8)
75
95
75
95
75
95
mV
15
15
mV
1.3
0.6
2
1.3
0.7
2
1.3
0.7
V
V
μ
A
μ
A
μ
A
V
S
= 2.4V
30
50
30
675
3
50
800
10
30
675
3
50
800
10
(Note 9)
3
10
BLOCK DIAGRAM
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| LP2950_05 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:100 mA LOW-DROPOUT VOLTAGE REGULATOR |
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| LP2950_08 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:100mA Low-Dropout Voltage Regulator |
| LP2950_09 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:100 mA LOW-DROPOUT VOLTAGE REGULATOR |
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