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LT1959 Datasheet(PDF) 5 Page - Linear Technology

Part No. LT1959
Description  4.5A, 500kHz Step-Down Switching Regulator
Download  24 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1959 Datasheet(HTML) 5 Page - Linear Technology

 
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5
LT1959
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency
BOOST Pin Current
Maximum Load Current
at VOUT = 3.3V
Maximum Load Current
at VOUT = 5V
Switch Voltage Drop
VC Pin Shutdown Threshold
Current Limit Foldback
*See “More Than Just Voltage Feedback” in the Applications Information section.
TEMPERATURE (
°C)
–50
550
540
530
520
510
500
490
480
470
460
450
100
1959 G11
–25
0
25
50
75
125
INPUT VOLTAGE (V)
5
2.6
2.8
3.2
3.4
3.6
9
13
15
4.4
1959 G13
3.0
711
3.8
4.0
4.2
L= 10
µH
L= 5
µH
L= 3
µH
L= 1.8
µH
SWITCH CURRENT (A)
0
0
10
20
40
30
60
50
12
3
45
1959 G15
80
70
100
90
DUTY CYCLE = 100%
INPUT VOLTAGE (V)
4
4.0
4.2
4.4
12
1959 G14
3.8
3.6
610
814
3.4
3.2
3.0
L= 10
µH
L= 5
µH
L= 3
µH
L= 1.8
µH
OUTPUT VOLTAGE (%)
0
5
6
7
80
1959 G16
4
3
20
40
60
100
2
1
0
FOLDBACK
CHARACTERISTICS
CURRENT
SOURCE
LOAD
RESISTOR
LOAD
MOS LOAD
POSSIBLE UNDESIRED
STABLE POINT FOR
CURRENT SOURCE
LOAD*
JUNCTION TEMPERATURE (
°C)
–50
1.4
1.2
1.0
0.8
0.6
0.4
100
1959 G17
–25
0
25
50
75
125
SHUTDOWN
SWITCH CURRENT (A)
0
250
200
400
125
°C
25
°C
350
300
45
1959 G18
150
100
50
0
1
2
3
500
450
–40
°C
Frequency Foldback
FEEDBACK PIN VOLTAGE (V)
0
500
400
300
200
100
0
0.2
0.4
0.6
0.8
1959 • G10
1.0
1.2
SWITCHING
FREQUENCY
FEEDBACK
PIN CURRENT


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