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| LTC3405A_15 Datasheet, PDF (4/16 Pages) Linear Technology – 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT | |||
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LTC3405A
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
RDS(ON) vs Temperature
1.2
VIN = 4.2V
1.0 VIN = 2.7V VIN = 3.6V
0.8
0.6
0.4
0.2
0
â50 â25
SYNCHRONOUS SWITCH
MAIN SWITCH
0 25 50 75 100 125
TEMPERATURE (°C)
3405A G11
Switch Leakage vs Temperature
160
VIN = 5.5V
140 RUN = 0V
120
100
80
60
SYNCHRONOUS
40
SWITCH
20
MAIN SWITCH
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3405A G14
Pulse Skipping Mode Operation
Dynamic Supply Current
1600
1400
VOUT = 1.8V
ILOAD = 0A
1200
1000
800
600
PULSE SKIPPING MODE
400
200
0
2
Burst Mode OPERATION
3
4
5
SUPPLY VOLTAGE (V)
6
3405A G12
Dynamic Supply Current
vs Temperature
600
VIN = 3.6V
VOUT = 1.8V
500 ILOAD = 0A
400
PULSE SKIPPING MODE
300
200
100
0
â50 â25
Burst Mode OPERATION
0 25 50 75
TEMPERATURE (°C)
100 125
3405A G13
Switch Leakage vs Input Voltage
60
RUN = 0V
50
SYNCHRONOUS
SWITCH
40
30
Burst Mode Operation
SW
5V/DIV
VOUT
100mV/DIV
AC COUPLED
20
MAIN SWITCH
10
IL
100mA/DIV
0
012
3
4
56
INPUT VOLTAGE (V)
3405A G15
Start-Up from Shutdown
VIN = 3.6V
VOUT = 1.8V
ILOAD = 20mA
5µs/DIV
Load Step
3405A G16
SW
5V/DIV
VOUT
10mV/DIV
AC
COUPLED
IL
100mA/DIV
RUN
2V/DIV
VOUT
1V/DIV
IL
200mA/DIV
VOUT
100mV/DIV
AC
COUPLED
IL
200mA/DIV
ILOAD
200mA/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 20mA
500ns/DIV
3405A G17
4
VIN = 3.6V
VOUT = 1.8V
ILOAD = 250mA
100µs/DIV
3405A G18
VIN = 3.6V
40µs/DIV
VOUT = 1.8V
ILOAD = 0mA TO 250mA
PULSE SKIPPING MODE
3405A G19
3405afa
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