參數(shù)資料
型號(hào)： SPX2950
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 150mA Low Dropout Voltage Regulators(150mA，低壓差穩(wěn)壓器)
中文描述： 150mA的低壓差穩(wěn)壓器（150毫安，低壓差穩(wěn)壓器）
文件頁(yè)數(shù)： 3/12頁(yè)
文件大小： 258K
代理商： SPX2950
Rev. 10/30/00
INPUT
OUTPUT
SHUTDOWN
GROUND
______
5V TAP
SENSE
5V @ 150mA
MAX
TO CMOS
OR
REFERENC
E
ERROR
DETECTION
COMPARATOR
ERROR
AMPLIFIER
1.23V
FROM
CMOS OR
TTL
+
+
_
+
_
+
+
+
60 mV
3
7
8
1
2
6
5
4
..
60k
330k
180k
..
..
μ
..
1
F
SPX2950 and SPX2951 Block
UNREGULATED DC
FEEDBACK
SPX2950/SPX2951
PARAMETER
CONDITIONS
(Note 2)
SPX2951
Min Typ Max
SPX2950AC
SPX2951AC
Min Typ
Max
SPX2950C
SPX2951C
Min Typ
Max
UNITS
8-Pin Version only (Continued)
Feedback Pin Bias Current
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Error Comparator
Output Leakage Current
Output Low Voltage
( Note 7 )
40
20
60
40
20
60
40
50
60
nA
ppm/°C
0.1
0.1
0.1
nA/°C
V
OH
= 30V
V
IN
= 4.5V
I
OL
= 400
μ
A
(Note 8)
(Note 8)
(Note 8)
0.01
150
1
0.01
150
1
0.01
150
1
μ
A
mV
250
250
250
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Shutdown Input
Input logic Voltage
40
60
75
15
40
60
75
15
40
60
75
15
mV
mV
mV
95
95
95
Low (Regulator ON)
High (Regulator OFF)
V
S
= 2.4V
V
S
= 30V
(Note 9)
2
1.3
0.6
2
1.3
0.7
2
1.3
0.7
V
V
μ
A
μ
A
μ
A
Shut down Pin Input Current
30
675
3
50
800
10
30
675
3
50
800
10
30
675
3
50
800
10
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 SPX2951 is tested at 150
°
C for I
L
= 1 mA. 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
≤
150 mA, T
J
≤
T
JMAX
.
Note 7:
Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 8:
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 9:
V
SHUTDOWN
≥
2V, V
IN
≤
30V, V
OUT
=0, Feedback pin tied to 5V Tap.
Note 10:
All typical values are not guaranteed. The value could vary from lot to lot.
BLOCK DIAGRAM
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