LTC3789_15 Datasheet, PDF (6/30 Pages) Linear Technology – High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

LTC3789
Typical Performance Characteristics T_A = 25°C unless otherwise noted.
Forced Continuous Mode
SW1
10V/DIV
SW2
10V/DIV
I_L
1A/DIV
V_IN = 6V
V_OUT = 12V
4µs/DIV
Forced Continuous Mode
SW1
10V/DIV
SW2
10V/DIV
3789 G10
I_L
1A/DIV
V_IN = 12V
V_OUT = 12V
4µs/DIV
3789 G11
Forced Continuous Mode
SW1
10V/DIV
SW2
10V/DIV
I_L
1A/DIV
V_IN = 18V
V_OUT = 12V
4µs/DIV
3789 G12
Pulse-Skipping Mode
SW1
10V/DIV
SW2
10V/DIV
I_L
1A/DIV
V_IN = 6V
V_OUT = 12V
4µs/DIV
Pulse-Skipping Mode
SW1
10V/DIV
SW2
10V/DIV
3789 G13
I_L
1A/DIV
V_IN = 12V
V_OUT = 12V
2µs/DIV
Pulse-Skipping Mode
SW1
10V/DIV
SW2
10V/DIV
3789 G14
I_L
1A/DIV
V_IN = 18V
V_OUT = 12V
2µs/DIV
3789 G15
Oscillator Frequency
vs Temperature
700
V_FREQ = 2.4V
600
500
400
V_FREQ = 1.2V
300
200
V_FREQ = 0V
100
0
–50
0
50
100
TEMPERATURE (°C)
150
3789 G16
Undervoltage Threshold at INTV_CC
vs Temperature
5.0
4.5
4.0
RISING
3.5
FALLING
3.0
2.5
2.0
1.5
1.0
0.5
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3789 G17
6
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Undervoltage Threshold at V_IN
vs Temperature
5.0
4.5
RISING
4.0
FALLING
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3789 G18
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