LTC3115-2_15 Datasheet, PDF (8/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
Typical Performance Characteristics (T_A = 25°C unless otherwise specified)
Power Switch Resistance
vs V_CC
170
165
160
155
150
145
140
2.5 3 3.5 4 4.5
V_CC (V)
5 5.5
31152 G32
SW1, SW2 Minimum Low Time
vs Temperature
110
108
f_SW = 1MHz
NO LOAD
106
104
102
100
98
96
94
92
90
–50
0
50
100
150
TEMPERATURE (°C)
31152 G35
SW2 Maximum Duty Cycle
vs Switching Frequency
95
94
93
92
91
90
0
500
1000
1500
2000
SWITCHING FREQUENCY (kHz)
31152 G38
FB Voltage vs Temperature
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–50
0
50
100
TEMPERATURE (°C)
150
31152 G33
SW1, SW2 Minimum Low Time
vs V_CC
180
160
f_SW = 300kHz
140
120
f_SW = 1MHz
100
80
f_SW = 2MHz
60
2.5 3 3.5 4 4.5
V_CC (V)
5 5.5
31152 G36
Die Temperature Rise vs Load
Current, V_OUT = 5V, f_SW = 750kHz
60
V_IN = 36V
V_IN = 24V
50
V_IN = 12V
V_IN = 6V
40
V_IN = 3.6V
30
20
10
0
0
STANDARD DEMO PCB
L = 15µH MSS1048
0.5
1
1.5
2
LOAD CURRENT (A)
31152 G49
8
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Inductor Current Limit Thresholds
vs Temperature
5
4
3
2
SWA
CURRENT
1
LIMIT
0
–1
–2
SWB
–3
CURRENT
LIMIT
–4
–5
–50
0
50
100
150
TEMPERATURE (°C)
31152 G34
SW1, SW2 Minimum Low Time
vs Switching Frequency
200
180
160
140
V_CC = 2.7V
120
100
V_CC = 4.4V
80
60
0
500
1000
1500
2000
SWITCHING FREQUENCY (kHz)
31152 G37
Die Temperature Rise vs Load
Current, V_OUT = 5V, f_SW = 1.5MHz
100
90
V_IN = 36V
V_IN = 24V
80
V_IN = 12V
V_IN = 6V
70
V_IN = 3.6V
60
50
40
30
20
10
STANDARD DEMO PCB
L = 15µH MSS1048
0
0
0.5
1
1.5
2
LOAD CURRENT (A)
31152 G50
31152fa