LTC3633A/LTC3633A-1
TYPICAL PERFORMANCE CHARACTERISTICS TJ = 25°C, VIN1 = VIN2 = 12V, fSW = 1MHz, L = 1μH
unless otherwise noted.
Efficiency vs Load Current
Efficiency vs Load Current
Burst Mode Operation
Forced Continuous Mode
Operation
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
Burst Mode OPERATION
V
OUT
= 1.8V
V
= 1.8V
OUT
FORCED
CONTINUOUS
OPERATION
L = 2.2μH
V
OUT
V
OUT
V
OUT
V
OUT
= 5V
V
V
V
V
= 4V
V
IN
V
IN
V
IN
V
IN
= 4V
IN
IN
IN
IN
= 3.3V
= 5V
= 8V
= 8V
= 12V
= 20V
= 12V
= 20V
= 3.3V
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
3633a G02
3633a G03
3633a G01
Efficiency vs Load Current
Burst Mode Operation
Efficiency vs Input Voltage
Burst Mode Operation
Reference Voltage
vs Temperature
100
90
80
70
60
50
40
30
20
10
0
100
95
90
85
80
75
70
65
60
0.605
0.603
0.601
0.599
0.597
0.595
V
OUT
= 1.2V
V
OUT
= 1.8V
V
V
V
V
V
= 4V
IN
IN
IN
IN
IN
I
I
I
I
= 10mA
= 100mA
= 1A
LOAD
LOAD
LOAD
LOAD
= 8V
= 12V
=15V
= 20V
= 3A
0.0001 0.001
0.01
0.1
1
10
4
6
8
10 12 14 16 18 20
INPUT VOLTAGE (V)
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
LOAD CURRENT (A)
3633a G04
3633a G05
3633a G06
Oscillator Frequency
vs Temperature
Oscillator Internal Set Frequency
vs Temperature
Load Regulation
1.6
1.2
10
8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
Burst Mode OPERATION
FORCED CONTINUOUS
R
= INTV
CC
T
V
OUT
= 1.8V
6
4
2
0.8
0
0.4
–2
–4
–6
–8
–10
0.0
–0.4
0
0.5
1
1.5
2
2.5
3
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100
125
I
(A)
TEMPERATURE (°C)
TEMPERATURE (°C)
LOAD
3633a G07
3633a G08
3633a G09
3633a1f
5
Linear [ Linear ]
