LTC3785 LINER [Linear Technology], LTC3785 Datasheet - Page 5

• Manufacturer Part Number: LTC3785
• Description: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
• Manufacturer: LINER [Linear Technology]

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