Datasheet

5
LTC3445
3445fa
Buck Efficiency and Power Loss
vs Load Current, V
CC1
= 2.5V
Buck Output Voltage
vs Load Current
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3445 G04
0
1
100
1000
10
1.0
0.1
DAC MAX
DAC MIN
DAC MIN
DAC MAX
EFFICIENCY
POWER LOSS
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3445 G05
0
1
100
1000
10
1.0
0.1
DAC MAX
DAC MIN
DAC MIN
DAC MAX
EFFICIENCY
POWER LOSS
LOAD CURRENT (mA)
–100
BUCK OUTPUT (V)
0.800
0.850
700
3445 G06
0.750
0.700
100
300
0.900
500
900
DAC = MIN
Buck Output Voltage
vs Load Current
I
VCC2
vs Temperature (RUN = V
CC1
)
LOAD CURRENT (mA)
–100
BUCK OUTPUT (V)
1.500
1.540
1.520
1.560
700
3445 G07
1.480
1.460
100
300
1.580
500
900
DAC = MAX
TEMPERATURE (°C)
0
V
CC2
LEAKAGE CURRENT (µA)
0.4
0.8
1.2
0.2
0.6
1.0
–10 30 70 110
3445 G08
150–50
V
CC2
= 2.5V
V
CC2
= 3.6V
V
CC2
= 4.2V
V
CC2
= 5.5V
I
VCC2
vs Temperature (RUN = 0V)
TEMPERATURE (°C)
0
V
CC2
LEAKAGE CURRENT (µA)
0.4
0.8
1.2
0.2
0.6
1.0
–10 30 70 110
3445 G09
150–50
V
CC2
= 2.5V
V
CC2
= 3.6V
V
CC2
= 4.2V
V
CC2
= 5.5V
TYPICAL PERFOR A CE CHARACTERISTICS
UW
R
DS(ON)
vs Input Voltage
Synchronous Switch R
DS(ON)
vs Temperature
INPUT VOLTAGE (V)
2.2 2.6 3 3.4 3.8 4.2 4.6 5 5.4
250
R
DS(ON)
(mΩ)
300
400
450
500
600
3445 G10
350
5.8
550
MAIN SWITCH
SYNCHRONOUS SWITCH
TEMPERATURE (°C)
–40
R
DS(ON)
(mΩ)
500
600
700
120
3445 G11
400
300
200
–20 0 20
40 60
80 100 140
V
CC1
= 2.5V
V
CC1
= 3.6V
V
CC1
= 4.2V
V
CC1
= 5.5V
Main Switch R
DS(ON)
vs Temperature
TEMPERATURE (°C)
–40
R
DS(ON)
(mΩ)
600
700
800
120
3445 G12
500
400
300
–20 0 20
40 60
80 100 140
V
CC1
= 2.5V
V
CC1
= 3.6V
V
CC1
= 4.2V
V
CC1
= 5.5V
Buck Efficiency and Power Loss
vs Load Current, V
CC1
= 4.2V