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LTC3445 데이터 시트보기 (PDF) - Linear Technology
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LTC3445
3A/ 4MHz/ Monolithic Synchronous Step-Down Regulator
Linear Technology
LTC3445 Datasheet PDF : 24 Pages
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LTC3445
TYPICAL PERFOR A CE CHARACTERISTICS
Slew Rates DAC Min to DAC Max
Buck (DAC = Min)
100mA to 300mA Load Step
Buck (DAC = Max)
100mA to 400mA Load Step
200mV/DIV
100
µ
s/DIV
BUCK
VOLTAGE
50mV/DIV
LOAD
CURRENT
100mA/DIV
3445 G13
20
µ
s/DIV
BUCK
VOLTAGE
50mV/DIV
LOAD
CURRENT
100mA/DIV
3445 G14
20
µ
s/DIV
3445 G15
Buck Switching Frequency
vs V
CC1
1.60
1.56
1.52
1.48
1.44
1.40
2.5
3.5
4.5
V
CC1
(V)
5.5
3445 G16
V
CC
BATT vs V
CC1
6
V
TRACK
= V
BACKUP
= 2V
5
4
V
CC
BATT
3
2
V
CC1
1
0
0
V
CC1
RAMP (V)
3445 G19
Buck Switching Frequency
vs Temperature
1.560
Soft-Start (DAC = Min and Max)
4.7
Ω
Load
1.540
1.520
BUCK
OUTPUTS
500mV/DIV
1.500
1.480
1.460
200
µ
s/DIV
3445 G18
1.440
–50
–25
0
25
50
75
100
125
150
TEMPERATURE (
°
C)
3445 G17
V
CC
BATT vs V
TRACK
6
V
CC1
= 5.5V
V
BACKUP
= 2V
5
4
V
CC
BATT
0mA
5mA
PowerPath LDO Load Step
1mA to 5.5mA
V
CC
BATT
20mV/DIV
3
2
V
TRACK
1
0
0
V
TRACK
RAMP (V)
LOAD
CURRENT
10mA/DIV
3445 G20
200
µ
s/DIV
3445 G21
3445fa
6
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