LTC3118_15 Datasheet, PDF (6/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

LTC3118
Typical Performance Characteristics
PWM to Burst Mode Thresholds
vs V_IN
420
5V_OUT
350 ^{L = 3.3µH}
280
12V_OUT
210
L = 6.8µH
140
70
0
2 4 6 8 10 12 14 16 18
V_IN1 OR V_IN2 VOLTAGE (V)
3118 G13
N-Channel MOSFET Leakage
vs Die Temperature and Stand-Off
Voltage
1000
100
25°C
50°C
75°C
100°C
125°C
150°C
175°C
10
1
0
0
3
6
9 12 15 18
STAND-OFF VOLTAGE (V)
3118 G16
Maximum Load Current vs V_IN in
PWM Mode
3.5
3.0
DIODE FROM V_OUT = 5V
TO V_CC
2.5
5V_OUT
L = 3.3µH
2.0
12V_OUT
L = 6.8µH
1.5
1.0
0.5
0
2 4 6 8 10 12 14 16 18
V_IN1 OR V_IN2 VOLTAGE (V)
3118 G14
Normalized N-MOSFET
Resistance vs V_CC
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
2.5 3 3.5 4 4.5
V_CC VOLTAGE (V)
5 5.5
3118 G17
Inductor Overload, Average and
Reverse Current Limits
vs Temperature
6
5
OVERLOAD
4
AVERAGE
3
2
1
0
REVERSE
–1
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3118 G15
Normalized N-Channel MOSFET
Resistance vs Die Temperature
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
–50
0
50
100
TEMPERATURE (°C)
150
3118 G18
FB Program Voltage
vs Temperature
1.025
1.020
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
0.975
–50
0
50
100
TEMPERATURE (°C)
150
3118 G19
V_CC vs Active V_IN
3.9
3.7
3.5
3.3
3.1
2.9
2.7
2.5
2.3
2 4 6 8 10 12 14 16 18
ACTIVE V_IN VOLTAGE (V)
3118 G20
3118f
6
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