LTC3789_15 Datasheet, PDF (5/30 Pages) Linear Technology – High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

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