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LTC1878 データシートの表示(PDF) - Linear Technology
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コンポーネント説明
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LTC1878
High Efficiency Monolithic Synchronous Step-Down Regulator
Linear Technology
LTC1878 Datasheet PDF : 16 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC1878
Switch Leakage vs Temperature
2.5
V
IN
= 7V
RUN = 0V
2.0
1.5
1.0
MAIN
SWITCH
SYNCHRONOUS
0.5
SWITCH
0
– 50 – 25
0 25 50 75
TEMPERATURE (
°
C)
100 125
1878 G13
Pulse Skipping Mode Operation
Switch Leakage vs Input Voltage
1.2
RUN = 0V
1.0
SYNCHRONOUS
SWITCH
0.8
0.6
0.4
MAIN
SWITCH
0.2
0
0 1234 56 78
INPUT VOLTAGE (V)
1878 G20
Start-Up from Shutdown
Burst Mode Operation
SW
5V/DIV
V
OUT
50mV/DIV
AC
COUPLED
I
L
200mA/DIV
V
IN
= 4.2V
V
OUT
= 1.5V
L = 10
µ
H
10
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 50mA
Load Step Response
1878 G14
SW
5V/DIV
V
OUT
20mV/DIV
AC
COUPLED
I
L
200mA/DIV
V
IN
= 4.2V
V
OUT
= 1.5V
L = 10
µ
H
1
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 50mA
RUN
2V/DIV
V
OUT
1V/DIV
I
L
500mA/DIV
1878 G15
V
IN
= 3.6V
V
OUT
= 1.5V
L = 10
µ
H
40
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 500mA
Load Step Response
V
OUT
50mV/DIV
AC
COUPLED
I
L
500mA/DIV
1878 G16
I
TH
1V/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
L = 10
µ
H
40
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 200mA TO 500mA
1878 G17
PULSE SKIPPING MODE
Load Step Response
V
OUT
100mV/DIV
AC
COUPLED
I
L
500mA/DIV
V
OUT
100mV/DIV
AC
COUPLED
I
L
500mA/DIV
I
TH
1V/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
L = 10
µ
H
40
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 50mA TO 500mA
PULSE SKIPPING MODE
1878 G18
I
TH
1V/DIV
V
IN
= 3.6V
V
OUT
= 1.5V
L = 10
µ
H
40
µ
s/DIV
C
IN
= 22
µ
F
C
OUT
= 47
µ
F
I
LOAD
= 50mA TO 500mA
Burst Mode OPERATION
1878 G19
5
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