Datasheet

LT8640/LT8640-1
8
Rev.C
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TYPICAL PERFORMANCE CHARACTERISTICS
RT Programmed Switching
Frequency
V
IN
UVLO
Bias Pin Current
Bias Pin Current
Switching Waveforms, Full
Frequency Continuous Operation
Switching Waveforms, Burst
Mode Operation Switching Waveforms
SWITCHING FREQUENCY (MHz)
0.2
RT PIN RESISTOR (kΩ)
150
200
250
1.8
8640 G28
100
50
125
175
225
75
25
0
0.6
1
1.4
2.2 2.6 3
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
3.4
35
8640 G29
2.8
2.4
–25 5 65
2.2
2.0
3.6
3.2
3.0
2.6
95 125 155
INPUT VOLTAGE (V)
5
BIAS PIN CURRENT (mA)
7.0
8.0
45
8640 G30
6.0
15
25
35
10
20
30
40
8.5
6.5
7.5
5.5
V
BIAS
= 5V
V
OUT
= 5V
I
LOAD
= 1A
f
SW
= 1MHz
SWITCHING FREQUENCY (MHz)
0.2
15
20
1.4 2.2
8640 G31
10
0.6 1
1.8 2.6 3
5
0
BIAS PIN CURRENT (mA)
V
BIAS
= 5V
V
OUT
= 5V
V
IN
= 12V
I
LOAD
= 1A
LOAD CURRENT (A)
0
CASE TEMPERATURE RISE (°C)
30
40
50
3
5
8640 G32
20
10
0
1 2 4
60
70
80
V
IN
= 12V, f
SW
= 1MHz
V
IN
= 24V, f
SW
= 1MHz
V
IN
= 12V, f
SW
= 2MHz
V
IN
= 24V, f
SW
= 2MHz
DC2202A DEMO BOARD
I
L
1A/DIV
V
SW
5V/DIV
500ns/DIV
FRONT PAGE APPLICATION
12V
IN
TO 5V
OUT
AT 1A
8640 G34
I
L
500mA/DIV
V
SW
5V/DIV
5µs/DIV
FRONT PAGE APPLICATION
12V
IN
TO 5V
OUT
AT 10mA
V
SYNC
= 0V
8640 G35
I
L
1A/DIV
V
SW
10V/DIV
500ns/DIV
FRONT PAGE APPLICATION
36V
IN
TO 5V
OUT
AT 1A
8640 G36
Case Temperature Rise
Case Temperature Rise vs 7A
Pulsed Load
DUTY CYCLE OF 7A LOAD
0
CASE TEMPERATURE RISE (°C)
30
40
50
0.6
0.8
8640 G33
20
10
0
0.2 0.4
60
70
80
90
V
IN
= 12V
V
OUT
= 5V
f
SW
= 2MHz
STANDBY LOAD = 0.25A
1KHz PULSED LOAD = 7A
DC2202A DEMO BOARD
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