Datasheet

LTC3633A-2/LTC3633A-3
5
3633a23f
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Load Current
Burst Mode Operation
Effi ciency vs Input Voltage
Burst Mode Operation
Load Regulation
Oscillator Frequency
vs Temperature
Effi ciency vs Load Current
Burst Mode Operation
Effi ciency vs Load Current
Forced Continuous Mode
Operation Effi ciency vs Load Current
T
J
= 25°C, PV
IN1
= PV
IN2
= SV
IN
= 12V, f
SW
= 1MHz,
L = 1μH unless otherwise noted.
Oscillator Internal Set Frequency
vs Temperature
Reference Voltage
vs Temperature
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G01
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
V
OUT
= 1.8V
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G02
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
V
IN
= 20V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
OUT
= 1.8V
0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G03
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
Burst Mode OPERATION
FORCED
CONTINUOUS
OPERATION
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 5V
L = 2.2µH
4
EFFICIENCY (%)
65
70
75
85
8
20
3633a23 G05
60
90
100
95
80
6 1012141618
I
LOAD
= 10mA
I
LOAD
= 100mA
I
LOAD
= 1A
I
LOAD
= 3A
INPUT VOLTAGE (V)
V
OUT
= 1.8V
0.0001 0.001
0
EFFICIENCY (%)
10
30
40
50
70
0.1
10
3633a23 G04
20
80
100
90
60
0.01 1
LOAD CURRENT (A)
V
IN
= 20V
V
IN
=15V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
OUT
= 1.2V
–50
V
FB
(V)
0.597
0.599
50
150
3633a23 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
3633a23 G07
–0.4
0.8
1.6
1.2
10.5 2 2.5
I
LOAD
(A)
Burst Mode OPERATION
FORCED CONTINUOUS
V
OUT
= 1.8V
–50
FREQUENCY VARIATION (%)
–8
–6
–4
–2
0
2
4
6
8
25
125
3633a23 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
3633a23 G09
1.4
2.6
0–25 50 75 100
TEMPERATURE (°C)
R
T
= INTV
CC