LTC1878 データシートの表示（PDF） - Linear Technology
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LTC1878 Datasheet PDF : 16 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LTC1878
Switch Leakage vs Temperature
2.5
VIN = 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
VOUT
50mV/DIV
AC
COUPLED
IL
200mA/DIV
VIN = 4.2V
VOUT = 1.5V
L = 10µH
10µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 50mA
Load Step Response
1878 G14
SW
5V/DIV
VOUT
20mV/DIV
AC
COUPLED
IL
200mA/DIV
VIN = 4.2V
VOUT = 1.5V
L = 10µH
1µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 50mA
RUN
2V/DIV
VOUT
1V/DIV
IL
500mA/DIV
1878 G15
VIN = 3.6V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 500mA
Load Step Response
VOUT
50mV/DIV
AC
COUPLED
IL
500mA/DIV
1878 G16
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 200mA TO 500mA 1878 G17
PULSE SKIPPING MODE
Load Step Response
VOUT
100mV/DIV
AC
COUPLED
IL
500mA/DIV
VOUT
100mV/DIV
AC
COUPLED
IL
500mA/DIV
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 50mA TO 500mA
PULSE SKIPPING MODE
1878 G18
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 10µH
40µs/DIV
CIN = 22µF
COUT = 47µF
ILOAD = 50mA TO 500mA
Burst Mode OPERATION
1878 G19
5
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