LTC3112_15 Datasheet, PDF (6/32 Pages) Linear Technology – 15V, 2.5A Synchronous Buck-Boost DC/DC Converter

LTC3112
Typical Performance Characteristics
T_A = 25°C, V_IN = 5.0V, V_OUT = 5.0V unless otherwise specified
Normalized N-Channel MOSFET
Resistance vs Temperature
1.4
1.3
1.2
1.1
1.0
Feedback Pin Program Voltage
vs Temperature
0.825
0.820
0.815
0.810
0.805
0.800
0.795
0.9
0.790
0.785
0.8
0.780
0.7
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G13
0.775
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G14
V_CC and V_IN UVLO vs Temperature
2.7
2.6
V_CC RISING
V_CC FALLING
2.5
V_IN RISING
2.4
V_IN FALLING
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G15
RUN and PWM/SYNC Threshold
Voltage vs Temperature
1.2
PWM/SYNC RISING
1.1
PWM/SYNC FALLING
RUN RISING
1.0
RUN FALLING
0.9
0.8
0.7
0.6
0.5
0.4
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G16
PWM Mode
I_LIMIT, I_PEAK, I_REV vs Temperature
12
I_PEAK
L = 4.7µH
10
8
I_LIMIT
6
4
2
0
I_REV
–2
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G17
Burst Mode Operation
I_PEAK, I_ZERO vs Temperature
2.0
L = 4.7µH
1.5
I_PEAK
1.0
0.5
I_ZERO
0
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G18
I_OUT Pin Current vs Temperature
1.5A Load Current
40
39
38
37
36
35
34
33
32
–60 –40 –20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
3112 G19
I_OUT Voltage vs V_OUT Current
3500
R_IOUT = 42.2k, C_IOUT = 100pF,
3000 ^{VOUT = 5V, 750kHz}
2500
2000
1500
1000
V_IN = 3V
500
V_IN = 5V
V_IN = 8V
V_IN = 12V
0
0 0.5 1 1.5 2 2.5 3 3.5
V_OUT CURRENT (A)
3112 G20
I_OUT Voltage vs V_IN
2500
2000
I_OUT = 2A
1500
I_OUT = 1.5A
1000
I_OUT = 1A
500
I_OUT = 500mA
R_IOUT = 42.2k, C_IOUT = 100pF,
V_OUT = 5V, 750kHz
0
2 3 4 5 6 7 8 9 10 11 12 13 14 15
V_IN (V)
3112 G21
3112fc
6
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