LTC3118_15 Datasheet, PDF (8/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

LTC3118
Typical Performance Characteristics
Switch and V_OUT Waveforms
(12V_IN, 12V_OUT)
12V_OUT
RIPPLE
100mV/DIV
I_L
1A/DIV
SW1
5V/DIV
SW2
5V/DIV
200ns/DIV
12V_IN2 to 5V_IN1 Switchover
Waveforms, V_OUT = 12V 500mA Load
100mA to 1A Load Step PWM
Mode (12V_IN, 12V_OUT)
12V_OUT
AC-COUPLED
500mV/DIV
12V_OUT
AC-COUPLED
500mV/DIV
I_L
1A/DIV
SEL
5V/DIV
SW1
10V/DIV
I_L
1A/DIV
INDUCTOR
1A/DIV
VC
200mV/DIV
3118 G29
L = 6.8µH
C_OUT = 100µF
500µs/DIV
3118 G30
L = 6.8µH
C_OUT = 100µF
500µs/DIV
3118 G31
5V_IN Burst Mode Waveforms
12V_OUT, 50mA
12V_OUT
RIPPLE
100mV/DIV
I_L
0.5A/DIV
12V_IN Burst Mode Waveforms
12V_OUT, 100mA
12V_OUT
RIPPLE
100mV/DIV
I_L
0.5A/DIV
18V_IN Burst Mode Waveforms
12V_OUT, 100mA
12V_OUT
RIPPLE
100mV/DIV
I_L
0.5A/DIV
SW2
10V/DIV
SW1
10V/DIV
SW2
10V/DIV
SW1
10V/DIV
SW2
10V/DIV
SW1
10V/DIV
L = 6.8µH
C_OUT = 100µF
5µs/DIV
3118 G32
L = 6.8µH
C_OUT = 100µF
5µs/DIV
3118 G33
L = 6.8µH
C_OUT = 100µF
5µs/DIV
3118 G34
Soft-Start Waveforms with 500mA
Load (12V_IN, 12V_OUT)
V_OUT Short-Circuit Waveforms
Response and Recovery
(12V_IN, 12V_OUT)
V_OUT
5V/DIV
I_L
1A/DIV
VC
500mV/DIV
RUN1 OR
RUN2
5V/DIV
R_L = 24Ω
V_OUT
5V/DIV
200µs/DIV
I_L
2A/DIV
VC
500mV/DIV
V_OUT SHORTED
SHORT
RELEASED
3118 G35
1ms/DIV
3118 G36
V_CC Short-Circuit Waveforms
Response and Recovery
(12V_IN, 12V_OUT, 500mA Load)
V_OUT
10V/DIV
I_L
1A/DIV
V_CC
5V/DIV
V_CC
SHORTED
SHORT
RELEASED
2ms/DIV
3118 G37
3118f
8
For more information www.linear.com/LTC3118