Datasheet

LTC3789
6
3789fa
Forced Continuous Mode Forced Continuous Mode Forced Continuous Mode
Pulse-Skipping Mode Pulse-Skipping Mode Pulse-Skipping Mode
Typical perForMance characTerisTics
T
A
= 25°C unless otherwise noted.
Oscillator Frequency
vs Temperature
Undervoltage Threshold at INTV
CC
vs Temperature
Undervoltage Threshold at V
IN
vs Temperature
4µs/DIV
SW1
10V/DIV
SW2
10V/DIV
I
L
1A/DIV
3789 G10
V
IN
= 6V
V
OUT
= 12V
4µs/DIV
SW1
10V/DIV
SW2
10V/DIV
I
L
1A/DIV
3789 G11
V
IN
= 12V
V
OUT
= 12V
4µs/DIV
I
L
1A/DIV
SW1
10V/DIV
SW2
10V/DIV
3789 G12
V
IN
= 18V
V
OUT
= 12V
4µs/DIV
I
L
1A/DIV
SW1
10V/DIV
SW2
10V/DIV
3789 G13
V
IN
= 6V
V
OUT
= 12V
2µs/DIV
I
L
1A/DIV
SW1
10V/DIV
SW2
10V/DIV
3789 G14
V
IN
= 12V
V
OUT
= 12V
2µs/DIV
I
L
1A/DIV
SW1
10V/DIV
SW2
10V/DIV
3789 G15
V
IN
= 18V
V
OUT
= 12V
TEMPERATURE (°C)
–60
0
UNDERVOLTAGE (V)
1.0
2.0
3.0
–40
–20
0 20 6040 80
4.0
5.0
0.5
1.5
2.5
3.5
4.5
100
3789 G17
RISING
FALLING
TEMPERATURE (°C)
–60
0
UNDERVOLTAGE (V)
1.0
2.0
3.0
–40
–20
0 20 6040 80
4.0
5.0
0.5
1.5
2.5
3.5
4.5
100
3789 G18
RISING
FALLING
TEMPERATURE (°C)
–50
0
OSCILLATOR FREQUENCY (kHz)
200
400
600
0 50 150100
700
100
300
500
3789 G16
V
FREQ
= 2.4V
V
FREQ
= 0V
V
FREQ
= 1.2V