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LT1977 Datasheet(PDF) 5 Page - Linear Technology

No. de Pieza. LT1977
Descripción  High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current
Descarga  24 Pages
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Fabricante  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LT1977 Datasheet(HTML) 5 Page - Linear Technology

 
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LT1977
5
1977f
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Peak Current Limit
Soft-Start Current Threshold
vs FB Voltage
Frequency Foldback Percentage
TEMPERATURE (°C)
–50
1.5
2.0
2.5
3.0
3.5
–25
–0
25
50
1977 G10
75
100
125
FB VOLTAGE (V)
0
0
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
TJ = 25°C
FB PIN VOLTAGE (V)
0
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 (VCESAT)
LOAD CURRENT (A)
–0.1
0
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
TJ = 125°C
TJ = 25°C
TJ = –50°C
INPUT VOLTAGE (V)
0
0
50
100
10
20
30
40
1977 F05
50
150
25
75
125
60
VOUT = 3.3V
TA = 25°C
Supply Current vs Input Voltage
LOAD CURRENT (A)
0
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
VOUT = 5V
START-UP
RUNNING
VOUT = 3.3V
START-UP
RUNNING
Minimum Input Voltage
Burst Mode Threshold
vs Input Voltage
INPUT VOLTAGE (V)
5
300
400
500
13
1977 G20
200
100
250
350
450
150
50
0
7
9
11
15
614
8
10
12
16 17 18 19 20
Burst Mode EXIT
(INCREASING LOAD)
Burst Mode ENTER
(DECREASING LOAD)
VOUT = 3.3V
L = 10µH
COUT = 100µF
Minimum On Time
Boost Current vs Load Current
TEMPERATURE (°C)
–50
0
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
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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