LTC3112_15 Datasheet, PDF (5/32 Pages) Linear Technology – 15V, 2.5A Synchronous Buck-Boost DC/DC Converter

Typical Performance Characteristics
T_A = 25°C, V_IN = 5.0V, V_OUT = 5.0V unless otherwise specified
Maximum Output Current
PWM Mode
4.8
Maximum Output Current
Burst Mode Operation
560
4.0
3.2
2.4
1.6
0.8
3.3V_OUT
5.0V_OUT
12V_OUT
0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3112 G04
480
400
320
240
160
80
3.3V_OUT
5.0V_OUT
12V_OUT
0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3112 G05
750kHz PWM Mode No-Load Input
Current
25
V_OUT = 5V
20
15
Burst Mode No-Load Input Current
with V_CC from V_IN or Back-Fed
from V_OUT with Optional Diode
350
V_OUT = 5V
300
V_CC FROM V_IN
V_CC FROM V_OUT
250
200
10
150
100
5
50
0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3112 G07
0
3
5
7
9 11 13 15
V_IN (V)
3112 G08
LTC3112
12V_IN to 12V_OUT Efficiency
vs Frequency with 4.7µH
100
90
80
70
60
50
40
30
0.01
0.1
1
LOAD CURRENT (mA)
500kHz
750KHz
1000kHz
1500kHz
10
3112 G06
V_CC Voltage vs V_IN
PWM Mode No Load
4.5
4.0
3.5
3.0
2.5
2.0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3112 G09
V_CC Voltage vs V_CC Current
4.4
V_IN = 5V
4.3
4.2
4.1
4.0
3.9
0 20 40 60 80 100 120 140
CURRENT FROM V_CC (mA)
3112 G10
Boost Mode Minimum SW1
Low Time vs V_CC Voltage
275
250
225
200
175
150
125
2.5
3
3.5
4
4.5
5
V_CC VOLTAGE (V)
3112 G11
Normalized N-Channel MOSFET
Resistance vs V_CC
1.3
1.2
1.1
1.0
0.9
0.8
0.7
2.5 2.75 3 3.25 3.5 3.75 4 4.25 4.5 4.75 5
V_CC (V)
3112 G12
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