Linear Technology LT3695 Series, Техническое описание

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LT3695 Series
5
3695fa
TYPICAL PERFORMANCE CHARACTERISTICS
No-Load Supply Current Maximum Load Current
Maximum Load Current Maximum Load Current Maximum Load Current
Effi ciency (V
OUT
= 5V, SYNC = 0V)
T
A
= 25°C, unless otherwise noted.
Effi ciency (V
OUT
= 3.3V, SYNC = 0V)
Effi ciency (V
OUT
= 3.3V, SYNC = 0V)
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
60
70
40
50
80
1000
3695 G01
30
10
20
1 10 100
90
V
IN
= 12V
V
IN
= 34V
L = 10μH
f = 800kHz
V
IN
= 24V
LOAD CURRENT (mA)
EFFICIENCY (%)
3695 G02
0.1
60
70
40
50
80
1000
30
10
20
1
10 100
90
V
IN
= 12V
V
IN
= 34V
L = 10μH
f = 800kHz
V
IN
= 24V
LOAD CURRENT (mA)
0.1
EFFICIENCY (%)
POWER LOSS(W)
70
60
80
90
1000
3695 G03
20
30
40
50
10
1 10 100
100
0.1
0.01
0.001
1
V
IN
= 12V
V
OUT
= 3.3V
L = 10μH
f = 800kHz
No-Load Supply Current
INPUT VOLTAGE (V)
0 5
LOAD CURRENT (A)
1.25
1.00
0.75
1.50
40
3695 G06
0.50
0.25
10 15 20 30 35 25
1.75
TYPICAL
MINIMUM
V
OUT
= 3.3V
L = 10μH
f = 800kHz
SYNC = 0V
SYNC = 3.3V
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
1.00
0.75
1.25
40
3682 G07
0.50
0.25
10 15 20 30 35 25
1.50
TYPICAL
MINIMUM
V
OUT
= 5V
L = 10μH
f = 800kHz SYNC = 0V
SYNC = 5V
INPUT VOLTAGE (V)
8
LOAD CURRENT (A)
1.00
1.25
20
3695 G08
0.50
0.75
0.25
10
12 14 16 18
1.50
TYPICAL
MINIMUM
V
OUT
= 5V
L = 4.7μH
f = 2MHz
SYNC = 0V
SYNC = 5V
INPUT VOLTAGE (V)
0
LOAD CURRENT (A)
1.50
1.25
1.75
40
3695 G09
1.00
0.75
0.50
0.25
5
10 15 20 30 35 25
TYPICAL
MINIMUM
V
OUT
= 1.8V
L = 10μH
f = 500kHz SYNC = 0V
SYNC = 3.3V
TEMPERATURE (°C)
–50
SUPPL
Y CURRENT (μA)
1300
1200
500
600
700
800
900
1000
1100
400
200
300
100
0
0 50 –25 25 100
3695 G05
150 75 125
CATCH DIODE: DIODES, INC. B140
V
IN
= 12V
V
OUT
= 3.3V
INCREASED SUPPLY CURRENT
DUE TO CATCH DIODE LEAKAGE
AT HIGH TEMPERATURE
INPUT VOLTAGE (V)
0 5
SUPPL
Y CURRENT (μA)
140
120
60
80
100
40
20
0
10 20 15 30
3695 G04
40 25 35
V
OUT
= 3.3V