LTC3118_15 Datasheet, PDF (7/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

Typical Performance Characteristics
LTC3118
V_CC vs Supply Current (V_IN > 5V)
Showing Current Limit
3.9
3.8
3.7
3.6
3.5
3.4
0
20
40
60
V_CC SUPPLY CURRENT (mA)
80
3118 G21
No-Load Active V_IN Current in
Burst Mode
250
225
200
175
150
125
100
V_OUT = 12V
75
V_OUT = 5V
50
DIODE FROM V_OUT = 5V TO V_CC
25
0
2 4 6 8 10 12 14 16 18
ACTIVE V_IN VOLTAGE (V)
3118 G22
No-Load Active V_IN Current in
PWM
24
20
V_OUT = 12V
16
V_OUT = 5V
12
8
DIODE FROM V_OUT = 5V TO V_CC
4
0
2 4 6 8 10 12 14 16 18
ACTIVE V_IN VOLTAGE (V)
3118 G23
MODE and SEL Logic Thresholds
1.4
1.2
1.0
0.8
RISING
0.6
FALLING
0.4
0.2
0
–50
0
50
100
150
TEMPERATURE (°C)
3118 G24
Active V_IN in Ideal Diode Mode
with Hysteresis
18
16
14
V_IN1 ACTIVE
12
10
V_IN2 ACTIVE
8
6
4
SEL = V_CC
2
2 4 6 8 10 12 14 16 18
V_IN2 VOLTAGE (V)
3118 G25
RUN1 and RUN2 Thresholds for
V_IN UVLO and V_CC Enable
1.4
V_IN UVLO RISING
1.2
V_IN UVLO FALLING
1.0
0.8
V_CC ON
0.6
V_CC OFF
0.4
0.2
0
–50
0
50
100
150
TEMPERATURE (°C)
3118 G26
RUN1 and RUN2 Current
vs Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 2 4 6 8 10 12 14 16 18
RUN VOLTAGE (V)
3118 G27
SW1, SW2 Minimum Low Time
vs V_CC
160
140
120
100
80
2.5 3 3.5 4 4.5 5 5.5
V_CC VOLTAGE (V)
3118 G28
3118f
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