Datasheet

LTC3633
5
3633fc
For more information www.linear.com/LTC3633
Typical perForMance characTerisTics
Efficiency vs Load Current
Efficiency vs Input Voltage
Burst Mode Operation
Load Regulation
Oscillator Frequency
vs Temperature
Efficiency vs Load Current
Burst Mode Operation
Efficiency vs Load Current
Forced Continuous Mode
Operation Efficiency vs Load Current
T
J
= 25°C, V
IN
= 12V, f
SW
= 1MHz, L = 1µH unless
otherwise noted.
Oscillator Internal Set Frequency
vs Temperature
Reference Voltage
vs Temperature
1
0
EFFICIENCY (%)
10
30
40
50
70
100
10000
3633 G01
20
80
100
90
60
10 1000
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
LOAD CURRENT (mA)
V
OUT
= 1.8V
1
0
EFFICIENCY (%)
10
30
40
50
70
100
10000
3633 G02
20
80
100
90
60
10 1000
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
LOAD CURRENT (mA)
V
OUT
= 1.8V
1
0
EFFICIENCY (%)
10
30
40
50
70
100
10000
3633 G03
20
80
100
90
60
10 1000
V
OUT
= 5V
V
OUT
= 3.3V
LOAD CURRENT (mA)
Burst Mode
OPERATION
FORCED
CONTINUOUS
OPERATION
4
EFFICIENCY (%)
65
70
75
85
8
16
3633 G05
60
90
100
95
80
6 10 12 14
I
LOAD
= 10mA
I
LOAD
= 100mA
I
LOAD
= 1A
I
LOAD
= 3A
INPUT VOLTAGE (V)
V
OUT
= 1.8V
0.1 1
0
EFFICIENCY (%)
10
30
40
50
70
100
10000
3633 G04
20
80
100
90
60
10 1000
LOAD CURRENT (mA)
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 1.2V
–50
V
FB
(V)
0.597
0.599
50
150
3633 G06
0.595
0.601
0.605
0.603
25–25 0 75 100 125
TEMPERATURE (°C)
0
∆V
OUT
/V
OUT
(%)
0.0
0.4
1.5
3
3633 G07
–0.4
0.8
1.6
1.2
10.5 2 2.5
I
LOAD
(A)
Burst Mode OPERATION
FORCED CONTINUOUS
–50
FREQUENCY VARIATION (%)
–8
–6
–4
–2
0
2
4
6
8
25
125
3633 G08
–10
10
0–25 50 75 100
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.6
1.8
2.0
2.2
2.4
25
125
3633 G09
1.4
2.6
0–25 50 75 100
TEMPERATURE (°C)
R
T
= INTV
CC