Datasheet

LT8641
7
Rev B
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TYPICAL PERFORMANCE CHARACTERISTICS
RT Programmed Switching
Frequency
V
IN
UVLO
SWITCHING FREQUENCY (MHz)
0.2
RT PIN RESISTOR (kΩ)
150
200
250
1.8
8641 G28
100
50
125
175
225
75
25
0
0.6
1
1.4
2.2 2.6 3
Case Temperature Rise
Case Temperature Rise vs 5A
Pulsed Load
V
BIAS
= 5V
V
OUT
= 5V
I
LOAD
= 1A
f
SW
= 1MHz
INPUT VOLTAGE (V)
5
15
25
35
45
55
65
4.5
5.0
5.5
6.0
6.5
7.0
7.5
BIAS PIN CURRENT (mA)
Bias Pin Current
8641 G30
V
BIAS
= 5V
V
OUT
= 5V
V
IN
= 12V
I
LOAD
= 1A
SWITCHING FREQUENCY (MHz)
0.2
0.6
1.0
1.4
1.8
2.2
2.6
3.0
0
5
10
15
20
BIAS PIN CURRENT (mA)
Bias Pin Current
8641 G31
Frequency Continuous Operation
Switching Waveforms, Full
500ns/DIV
V
SW
5V/DIV
I
L
1A/DIV
8641 G34
FRONT PAGE APPLICATION
12V
IN
TO 5V
OUT
AT 1A
Mode Operation
Switching Waveforms, Burst
10µs/DIV
V
SW
5V/DIV
I
L
500mA/DIV
8641 G35
FRONT PAGE APPLICATION
12V
IN
TO 5V
OUT
AT 10mA
V
SYNC
= 0V
Switching Waveforms
500ns/DIV
V
SW
20V/DIV
I
L
1A/DIV
8641 G36
FRONT PAGE APPLICATION
48V
IN
TO 5V
OUT
AT 1A
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
2.0
2.2
2.4
2.6
2.8
3.0
3.2
INPUT VOLTAGE (V)
Minimum Input Voltage
8641 G29
DC2373A DEMO BOARD
V
IN
= 12V, f
SW
= 1MHz
V
IN
= 24V, f
SW
= 1MHz
V
IN
= 12V, f
SW
= 2MHz
V
IN
= 24V, f
SW
= 2MHz
LOAD CURRENT (A)
0
0.5
1
1.5
2
2.5
3
3.5
0
10
20
30
40
50
60
CASE TEMPERATURE RISE (°C)
Case Temperature Rise
8641 G32
DC2373A DEMO BOARD
V
IN
= 12V
V
OUT
= 5V
f
SW
= 2MHz
STANDBY LOAD = 0.25A
1kHz PULSED LOAD = 5A
DUTY CYCLE OF 5A LOAD
0
0.2
0.4
0.6
0.8
0
10
20
30
40
50
60
70
80
90
CASE TEMPERATURE RISE (°C)
Pulsed Load
8641 G33
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