Datasheet

LTC3634
5
3634fb
For more information www.linear.com/LTC3634
Typical perForMance characTerisTics
T
A
= 25°C, V
IN
= 12V, f
SW
= 1MHz, L = 1.5μH unless
otherwise noted.
Efficiency vs Load Current
(Burst Mode Operation)
Efficiency vs Load Current
(Forced Continuous)
Efficiency vs Load Current
(Forced Continuous)
0.001
EFFICIENCY (%)
10
20
10
3634 G01
0
30
40
50
60
70
80
100
90
10.01 0.1
LOAD CURRENT (A)
V
OUT
= 1.8V
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
IN
= 15V
0.001
EFFICIENCY (%)
10
20
10
3634 G02
0
30
40
50
60
70
80
100
90
10.01 0.1
LOAD CURRENT (A)
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 1.8V
0.001
EFFICIENCY (%)
10
20
10
3634 G03
0
30
40
50
60
70
80
100
90
10.01 0.1
LOAD CURRENT (A)
V
OUT
= 1.5V
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
IN
= 15V
V
TT
Power Loss vs Load Current,
Sourcing and Sinking Efficiency vs Input Voltage
Reference Voltage
vs Temperature
V
TT
Power Loss vs Load Current
Oscillator Frequency
vs Temperature
Oscillator Internal Set Frequency
vs Temperature
FREQUENCY VARIATION (%)
–8
–6
–4
–2
0
2
4
6
8
3634 G08
–10
10
TEMPERATURE (°C)
–50 50
150125
25–25 0 75 100
FREQUENCY (MHz)
1.6
1.8
2.0
2.2
2.4
3634 G09
1.4
2.6
TEMPERATURE (°C)
–50 50 15012525–25 0 75 100
–3
POWER LOSS (W)
3
3634 G04
0
0.2
0.4
0.6
0.8
1.2
1.0
10 2–2 –1
OUTPUT CURRENT (A)
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
TT
= 0.9V
L = 0.82µH
4
EFFICIENCY (%)
16
3634 G05
60
65
70
75
80
90
95
85
1210 146 8
INPUT VOLTAGE (V)
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 1A
I
OUT
= 3A
–50
REFERENCE VOLTAGE (V)
0.597
0.599
50
150
125
3634 G07
0.595
0.601
0.605
0.603
25–25 0 75 100
TEMPERATURE (°C)
–3
POWER LOSS (W)
3
3634 G06
0
0.2
0.4
0.6
0.8
1.2
1.0
10 2–2 –1
OUTPUT CURRENT (A)
V
IN
= 15V
V
IN
= 12V
V
IN
= 8V
V
IN
= 4V
V
TT
= 0.75V
L = 0.82µH