Datasheet

LTC3112
5
3112fc
For more information www.linear.com/LTC3112
Maximum Output Current
PWM Mode
Maximum Output Current
Burst Mode Operation
12V
IN
to 12V
OUT
Efficiency
vs Frequency with 4.7µH
V
IN
(V)
2
MAXIMUM OUTPUT CURRENT (A)
3.2
4.0
4.8
1.6
2.4
0
0.8
4 6 7 8 9 10 11 12 13 14 155
3112 G04
3
3.3V
OUT
5.0V
OUT
12V
OUT
V
IN
(V)
2
MAXIMUM OUTPUT CURRENT (mA)
320
400
480
560
160
240
0
80
4 6 7 8 9 10 11 12 13 14 155
3112 G05
3
3.3V
OUT
5.0V
OUT
12V
OUT
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
70
80
90
100
50
60
30
40
0.1 1 10
3112 G06
500kHz
750KHz
1000kHz
1500kHz
Typical perForMance characTerisTics
T
A
= 25°C, V
IN
= 5.0V, V
OUT
= 5.0V unless otherwise specified
V
CC
Voltage vs V
CC
Current
Boost Mode Minimum SW1
Low Time vs V
CC
Voltage
Normalized N-Channel MOSFET
Resistance vs V
CC
750kHz PWM Mode No-Load Input
Current
Burst Mode No-Load Input Current
with V
CC
from V
IN
or Back-Fed
from V
OUT
with Optional Diode
V
CC
Voltage vs V
IN
PWM Mode No Load
V
IN
(V)
2
V
IN
CURRENT (mA)
20
25
10
15
0
5
4 6 7 8 9 10 11 12 13 14 155
3112 G07
3
V
OUT
= 5V
V
IN
(V)
3
CURRENT FROM V
IN
(µA)
250
300
350
150
200
0
50
100
5 7 9 11 13 15
3112 G08
V
OUT
= 5V
V
CC
FROM V
IN
V
CC
FROM V
OUT
V
IN
(V)
2
V
CC
(V)
4.0
4.5
3.0
3.5
2.0
2.5
4 6 7 8 9 10 11 12 13 14 155
3112 G09
3
CURRENT FROM V
CC
(mA)
0
V
CC
(V)
4.3
4.4
4.1
4.2
3.9
4.0
20 40 60 80 100 120 140
3112 G10
V
IN
= 5V
V
CC
VOLTAGE (V)
2.5
MINIMUM SW1 LOW TIME (ns)
250
275
200
225
125
175
150
3.5 4 4.5 53
3112 G11
V
CC
(V)
2.5
NORMALIZED N-CHANNEL MOSFET RESISTANCE
1.2
1.3
0.9
1.0
1.1
0.7
0.8
3.5 3.75 4 4.25 4.5 4.75 52.75 3 3.25
3112 G12