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參數(shù)資料
| 型號： | LT1123CST |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, PDSO4 |
| 封裝： | PLASTIC, SOT-223, 4 PIN |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 167K |
| 代理商： | LT1123CST |
3
LT1123
1123fb
TEMPERATURE (
°
C)
0
100
F
μ
A
200
300
400
25
50
75
100
LT1123 G01
125
V
FB
= 5V
Feedback Pin Bias Current
vs Temperature
FEEDBACK PIN VOLTAGE (V)
0
F
μ
A
300
400
500
4
LT1123 G04
200
100
0
1
2
3
5
T
J
= 125
°
C
T
J
= 0
°
C
T
J
= 25
°
C
TEMPERATURE (
°
C)
–50
O
5.01
5.02
5.03
25
75
LT1123 G06
5.00
4.99
–25
0
50
100
125
4.98
4.97
Output Voltage vs Temperature
TEMPERATURE (
°
C)
0
0
M
μ
A
200
400
600
25
50
75
100
LT1123 G02
125
100
300
500
V
DRIVE
= 3V
Minimum Drive Pin Current
vs Temperature
DRIVE CURRENT (mA)
0
0
D
1.0
2.5
40
80
100
LT1123 G05
0.5
2.0
1.5
20
60
120
140
T
J
= 125
°
C
T
J
= 0
°
C
T
J
= 25
°
C
V
FB
= 4.5V
Drive Pin Saturation Voltage
vs Drive Current
C
HARA TERISTICS
U
A
TYPICAL PERFOR
CE
FEEDBACK PIN VOLTAGE (V)
0
0
D
50
100
150
1
2
3
4
LT1123 G03
5
6
200
T
J
= 125
°
C
T
J
= –50
°
C
T
J
= 25
°
C
V
DRIVE
= 3V
Drive Current
vs Feedback Pin Voltage
Feedback Pin Bias Current
vs Feedback Pin Voltage
PIU
Drive Pin:
The drive pin serves two functions. It provides
current to the LT1123 for its internal circuitry including
start-up, bias, current limit, thermal limit and a portion of
the base drive current for the output Darlington. The sum
total of these currents (450
μ
A typical) is equal to the
minimum drive current. This current is listed in the speci-
fications as Drive Current with V
FB
= 5.2V. This is the
minimum current required by the drive pin of the LT1123.
The second function of the drive pin is to sink the base
drive current of the external PNP pass transistor. The
available drive current is specified for two conditions.
Drive current with V
FB
= 4.80V gives the range of current
available under nominal operating conditions, when the
device is regulating. Drive current with V
FB
= 0.5V gives the
range of drive current available with the feedback pin
pulled low as it would be during start-up or during a short-
circuit fault. The drive current available when the feedback
pin is pulled low is less than the drive current available
when the device is regulating (V
FB
= 5V). This can be seen
in the curve of Drive Current vs V
FB
Voltage in the Typical
Performance Characteristics curves. This can provide
some foldback in the current limit of the regulator circuit.
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