Datasheet

LTC3789
5
3789fa
Typical perForMance characTerisTics
Efficiency vs Output Current
(Boost Region)
Efficiency vs Output Current
(Buck-Boost Region)
Efficiency vs Output Current
(Buck Region)
Efficiency vs V
IN
Internal 5.5V LDO Line
Regulation EXTV
CC
LDO Line Regulation
INTV
CC
and EXTV
CC
Switch
Voltage vs Temperature Supply Current vs Input Voltage
RUN Pin Threshold
vs Temperature
T
A
= 25°C unless otherwise noted.
LOAD CURRENT (mA)
10
40
EFFICIENCY (%)
50
60
70
80
100 1000 10000
30
20
10
0
90
100
3789 G01
V
IN
= 6V
V
OUT
= 12V
DCM
FCM
DCM
FCM
CIRCUIT OF FIGURE 13
LOAD CURRENT (mA)
10
40
EFFICIENCY (%)
50
60
70
80
100 1000 10000
30
20
10
0
90
100
3789 G02
V
IN
= 12V
V
OUT
= 12V
DCM
FCM
CIRCUIT OF FIGURE 13
LOAD CURRENT (mA)
10
40
EFFICIENCY (%)
50
60
70
80
100 1000 10000
30
20
10
0
90
100
3789 G03
V
IN
= 18V
V
OUT
= 12V
DCM
FCM
CIRCUIT OF FIGURE 13
V
IN
(V)
0
91
EFFICIENCY (%)
93
95
97
10 20 4030
99
92
94
96
98
3789 G04
200kHz
300kHz
400kHz
520kHz
FREQUENCY
CIRCUIT OF FIGURE 13
INPUT VOLTAGE (V)
4
3.5
INTV
CC
VOLTAGE (V)
4.0
4.5
6.0
5.5
14
24
29
5.0
9
19
34
3789 G05
EXTV
CC
(V)
4
INTV
CC
(V)
4
5
11
3
2
6 8
5 13
7 9
12
10 14
1
0
6
3789 G06
TEMPERATURE (°C)
–60
INTV
CC
AND EXTV
CC
SWITCH VOLTAGE (V)
4
5
3
2
–20 0 40
–40
20 60 80 100
1
0
6
3789 G07
RISING
FALLING
INPUT VOLTAGE (V)
4
0
SUPPLY CURRENT (mA)
0.5
1.5
2.0
2.5
4.0
3.5
14
24
29
1.0
3.0
9
19
34
3789 G08
TEMPERATURE (°C)
–60
0.5
UNDERVOLTAGE RESET VOLTAGE AT RUN (V)
0.7
0.9
1.1
–40
–20
0 20 6040 80
1.3
1.5
0.6
0.8
1.0
1.2
1.4
100
3789 G09
RISING
FALLING