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參數(shù)資料
| 型號： | 1977IFE |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current |
| 中文描述： | 高電壓，500kHz降壓1.5安培的電流型開關穩(wěn)壓器的靜態(tài)電流為100uA |
| 文件頁數(shù)： | 5/24頁 |
| 文件大?。?/td> | 288K |
| 代理商： | 1977IFE |
LT1977
5
1977f
TYPICAL PERFOR U
Switch Peak Current Limit
Soft-Start Current Threshold
vs FB Voltage
Frequency Foldback Percentage
TEMPERATURE (
°
C)
–50
1.5
P
2.0
2.5
3.0
3.5
–25
–0
25
50
1977 G10
75
100
125
FB VOLTAGE (V)
0
0
C
μ
A
10
20
30
0.2
0.4
0.6
0.8
1977 G11
1.0
40
50
5
15
25
35
45
1.2
SOFT-START
DEFEATED
T
J
= 25
°
C
FB PIN VOLTAGE (V)
0
F
60
80
100
1
1977 G12
40
20
50
70
90
30
10
0
0.25
0.5
0.75
1.25
Switch On Voltage (V
CESAT
)
LOAD CURRENT (A)
–0.1
0
V
50
150
200
250
500
350
0.3
0.7
0.9
1977 G13
100
400
450
300
0.1
0.5
1.1
1.3
1.5
T
J
= 125
°
C
T
J
= 25
°
C
T
J
= –50
°
C
INPUT VOLTAGE (V)
0
0
S
μ
A
50
100
10
20
30
40
1977 F05
50
150
25
75
125
60
V
OUT
= 3.3V
A
= 25
°
C
Supply Current vs Input Voltage
LOAD CURRENT (A)
0
I
6.0
7.0
8.0
1
1977 G19
5.0
4.0
5.5
6.5
7.5
4.5
3.5
3.0
0.25
0.5
0.75
1.25
V
= 5V
START-UP
RUNNING
V
= 3.3V
START-UP
RUNNING
Minimum Input Voltage
Burst Mode Threshold
vs Input Voltage
INPUT VOLTAGE (V)
5
L
300
400
500
13
1977 G20
200
100
250
350
450
150
50
0
7
9
11
15
6
14
8
10
12
16 17 18 19 20
Burst Mode EXIT
(INCREASING LOAD)
Burst Mode ENTER
(DECREASING LOAD)
V
= 3.3V
L = 10
μ
H
C
OUT
= 100
μ
F
Minimum On Time
Boost Current vs Load Current
TEMPERATURE (
°
C)
–50
0
O
50
150
200
250
500
350
0
50
75
1977 G21
100
400
450
300
–25
25
100
125
LOAD CURRENT = 0.5A
LOAD CURRENT = 1A
LOAD CURRENT (A)
0
0
B
5
15
20
25
1
45
1977 G22
10
0.5
0.25
1.25
0.75
1.5
30
35
40
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