 English |
|
|
|
|
|
|
|
| LTC3445 Datasheet, PDF (5/24 Pages) Linear Technology – I2C Controllable Buck Regulator with Two LDOs in a 4mm × 4mm QFN | |||
| |||
| ◁ |
TYPICAL PERFOR A CE CHARACTERISTICS
LTC3445
Buck Efficiency and Power Loss
vs Load Current, VCC1 = 2.5V
100
1000
90
EFFICIENCY
80
70
DAC MIN
DAC MAX
100
60
50
10
DAC MAX
40
30
POWER LOSS
1.0
20
DAC MIN
10
0
0.1
0.1
1
10
100
1000
LOAD CURRENT (mA)
3445 G04
Buck Efficiency and Power Loss
vs Load Current, VCC1 = 4.2V
100
1000
90
EFFICIENCY
80
DAC MAX
DAC MIN
100
70
60
50
10
40
30
20
DAC MAX
POWER LOSS 1.0
10
0
0.1
DAC MIN
1
10
100
LOAD CURRENT (mA)
0.1
1000
3445 G05
Buck Output Voltage
vs Load Current
1.580
DAC = MAX
1.560
1.540
IVCC2 vs Temperature (RUN = VCC1)
1.2
VCC2 = 2.5V
VCC2 = 3.6V
1.0
VCC2 = 4.2V
VCC2 = 5.5V
0.8
Buck Output Voltage
vs Load Current
0.900
DAC = MIN
0.850
0.800
0.750
0.700
â100
100 300 500 700
LOAD CURRENT (mA)
900
3445 G06
IVCC2 vs Temperature (RUN = 0V)
1.2
VCC2 = 2.5V
VCC2 = 3.6V
1.0
VCC2 = 4.2V
VCC2 = 5.5V
0.8
1.520
0.6
0.6
1.500
0.4
0.4
1.480
0.2
0.2
1.460
â100
100 300 500 700
LOAD CURRENT (mA)
900
3445 G07
RDS(ON) vs Input Voltage
600
550
500
MAIN SWITCH
450
400
SYNCHRONOUS SWITCH
350
300
250
2.2 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8
INPUT VOLTAGE (V)
3445 G10
0
â50
â10
30
70 110 150
TEMPERATURE (°C)
3445 G08
Synchronous Switch RDS(ON)
vs Temperature
700
VCC1 = 2.5V
VCC1 = 3.6V
600
VCC1 = 4.2V
VCC1 = 5.5V
500
400
300
200
â40 â20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
3445 G11
0
â50
â10 30
70 110 150
TEMPERATURE (°C)
3445 G09
Main Switch RDS(ON)
vs Temperature
800
VCC1 = 2.5V
VCC1 = 3.6V
700
VCC1 = 4.2V
VCC1 = 5.5V
600
500
400
300
â40 â20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
3445 G12
3445fa
5
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese