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| LTC3404 Datasheet, PDF (5/16 Pages) Linear Technology – 1.4MHz High Efficiency Monolithic Synchronous Step-Down Regulator | |||
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TYPICAL PERFOR A CE CHARACTERISTICS
DC Supply Current
vs Temperature
450
400
PULSE SKIPPING
350
MODE
300
250
VIN = 3.6V
VOUT = 1.5V
200
150
100
50
0
â50 â25
Burst Mode
OPERATION
0 25 50 75
TEMPERATURE (°C)
100 125
3404 G12
Switch Leakage vs Temperature
2.5
VIN = 7V
RUN = 0V
2.0
1.5
1.0
MAIN
SWITCH
SYNCHRONOUS
0.5
SWITCH
0
â 50 â 25
0 25 50 75
TEMPERATURE (°C)
100 125
3404 G13
Burst Mode Operation
Pulse Skipping Mode Operation
LTC3404
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)
3404 G20
Start-Up from Shutdown
SW
5V/DIV
VOUT
50mV/DIV
AC
COUPLED
IL
200mA/DIV
VIN = 4.2V
VOUT = 1.5V
L = 4.7µH
10µs/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 30mA
Load Step Response
SW
5V/DIV
VOUT
10mV/DIV
IL
100mA/DIV
3404 G14
VIN = 4.2V
VOUT = 1.5V
L = 4.7µH
500ns/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 30mA
Load Step Response
RUN
2V/DIV
VOUT
1V/DIV
IL
500mA/DIV
3404 G15
VIN = 3.6V
VOUT = 1.5V
L = 4.7µH
40µs/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 500mA
Load Step Response
3404 G16
VOUT
100mV/DIV
IL
500mA/DIV
VOUT
100mV/DIV
IL
500mA/DIV
VOUT
100mV/DIV
IL
500mA/DIV
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 4.7µH
40µs/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 200mA TO 500mA 3404 G17
PULSE SKIPPING MODE
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 4.7µH
40µs/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 50mA TO 500mA
PULSE SKIPPING MODE
3404 G18
ITH
1V/DIV
VIN = 3.6V
VOUT = 1.5V
L = 4.7µH
40µs/DIV
CIN = 10µF
COUT = 22µF
ILOAD = 50mA TO 500mA
Burst Mode OPERATION
3404 G19
5
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