lt1959cs8-trpbf Linear Technology Corporation, lt1959cs8-trpbf Datasheet - Page 5

• Manufacturer Part Number: lt1959cs8-trpbf
• Description: 4.5a, 500khz Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

*See “More Than Just Voltage Feedback” in the Applications Information section.
TYPICAL PERFORMANCE CHARACTERISTICS
500
400
300
200
100
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
4
0
Frequency Foldback
Maximum Load Current
at V
OUT
0.2
6
FEEDBACK PIN VOLTAGE (V)
= 3.3V
INPUT VOLTAGE (V)
0.4
8
1.4
1.2
1.0
0.8
0.6
0.4
0.6
–50
SWITCHING
FREQUENCY
FEEDBACK
PIN CURRENT
V
10
C
SHUTDOWN
0.8
Pin Shutdown Threshold
–25
L= 1.8 H
L= 10 H
JUNCTION TEMPERATURE ( C)
L= 5 H
L= 3 H
W
12
1.0
0
1959 • G10
1959 G14
U
25
1.2
14
50
75
100
550
540
530
520
510
500
490
480
470
460
450
90
80
70
60
50
40
30
10
20
0
– 50
0
100
BOOST Pin Current
Switching Frequency
DUTY CYCLE = 100%
1959 G17
–25
125
1
SWITCH CURRENT (A)
0
TEMPERATURE ( C)
2
25
50
3
75
4
500
450
400
350
300
250
200
150
100
50
100
0
1959 G11
Switch Voltage Drop
1959 G15
0
125
5
1
SWITCH CURRENT (A)
4.4
4.2
4.0
3.8
3.6
3.4
3.0
3.2
2.8
2.6
2
7
6
5
4
3
2
1
0
5
0
Current Limit Foldback
Maximum Load Current
at V
POSSIBLE UNDESIRED
STABLE POINT FOR
CURRENT SOURCE
LOAD*
3
OUT
125 C
20
25 C
7
= 5V
OUTPUT VOLTAGE (%)
– 40 C
INPUT VOLTAGE (V)
4
40
1959 G18
9
RESISTOR
5
CHARACTERISTICS
60
11
LOAD
LT1959
FOLDBACK
MOS LOAD
L= 1.8 H
CURRENT
L= 10 H
SOURCE
L= 5 H
L= 3 H
80
13
LOAD
1959 G13
1959 G16
5
100
15