LTC3675 Datasheet, PDF (13/36 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3675
Buck-Boost Regulator,
V_OUT6 vs Temperature
3.40
PWM MODE, LOAD = 500mA
3.38
3.36
3.34
V_IN = 5.5V
3.32
3.30
3.28
V_IN = 3.6V
V_IN = 2.7V
3.26
3.24
3.22
3.20
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G40
Buck-Boost Regulator, Forward
Current Limit vs Temperature
2.90
2.85
2.80
2.75
2.70
V_IN = 3.6V
V_IN = 2.7V
2.65
2.60
2.55
V_IN = 4.2V
2.50
2.45
2.40
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G41
Buck-Boost Regulator, Switch
R_DSON vs Temperature
0.60
0.55
0.50
0.45
NMOS R_DSON, V_IN = 2.7V
0.40
0.35 ^{PMOS R}DSON^{, V}IN ^{= 2.7V}
0.30
0.25
0.20
0.15
PMOS R_DSON, V_IN = 4.2V
0.10
NMOS R_DSON, V_IN = 4.2V
0.05
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G42
LED Driver, Dual String Efficiency,
10 LEDs per String
100
90
80
V_IN = 4.2V
70
60
50
V_IN = 2.7V
40
30
20
10
R_{LED_FS} = 20kΩ
0
1
10
100
1000
DAC CODE (DECIMAL)
3675 G43
LED Driver, LED Current
vs Temperature
10.25
SINGLE LED STRING CURRENT
10.20 _{MODE0 = MODE1 = 0}
10.15
10.10
10.05
10.00
V_IN = 3.6V
V_IN = 5.5V
9.95
V_IN = 2.7V
9.90
9.85
9.80
9.75
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G46
LED Driver, Dual String Efficiency,
4 LEDs per String
100
90
V_IN = 4.2V
80
V_IN = 2.7V
70
60
50
40
30
20
10
R_{LED_FS} = 20kΩ
0
1
10
100
1000
DAC CODE (DECIMAL)
3675 G44
LED Driver, Forward Current Limit
vs Temperature
2.10
2.05
2.00
1.95
1.90
V_IN = 2.7V
V_IN = 3.6V
1.85
1.80
V_IN = 5.5V
1.75
1.70
1.65
1.60
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G45
High Voltage Boost Regulator,
Efficiency vs Load
100
90
80
V_IN = 5.5V
70
V_IN = 2.7V
60
50
V_IN = 3.6V
40
30
20
10
MODE1 = 1, MODE0 = 0
V_OUT = 12V
0
1
10
100
LOAD CURRENT (mA)
1000
3675 G47
Always-On LDO, Load Regulation
1.220
1.215
1.210
1.205
1.200
1.195
1.190
V_IN = 2.7V
V_IN = 5.5V
V_IN = 3.6V
1.185
1.180
0.1
1
10
LOAD CURRENT (mA)
100
3675 G48
3675f
13