Datasheet

4
LTC3405
3405fa
R
DS(ON)
vs Temperature
Dynamic Supply Current
Dynamic Supply Current
vs Temperature
Switch Leakage vs Temperature
Switch Leakage vs Input Voltage
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
1.2
1.0
0.8
0.6
0.4
0.2
0
25 75
–25 0
50 100 125
3405 G11
SYNCHRONOUS SWITCH
MAIN SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SUPPLY VOLTAGE (V)
2
DYNAMIC SUPPLY CURRENT (µA)
1600
1400
1200
1000
800
600
400
200
0
34 56
3405 G12
V
OUT
= 1.8V
I
LOAD
= 0A
PULSE SKIPPING MODE
Burst Mode OPERATION
TEMPERATURE (°C)
–50
DYNAMIC SUPPLY CURRENT (µA)
600
500
400
300
200
100
0
25 75
–25 0
50 100 125
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0A
3405 G13
PULSE SKIPPING MODE
Burst Mode OPERATION
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
160
140
120
100
80
60
40
20
0
25 75
–25 0
50 100 125
V
IN
= 5.5V
RUN = 0V
3405 G14
MAIN SWITCH
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (pA)
60
50
40
30
20
10
0
1
234
3405 G15
56
RUN = 0V
MAIN SWITCH
SYNCHRONOUS
SWITCH
SW
5V/DIV
V
OUT
50mV/DIV
AC COUPLED
I
L
100mA/DIV
3405 G16
5µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
20mA
SW
5V/DIV
V
OUT
20mV/DIV
AC
COUPLED
I
L
100mA/DIV
3405 G17
500ns/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
20mA
RUN
2V/DIV
V
OUT
1V/DIV
I
L
200mA/DIV
3405 G18
100µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
250mA
3405 G19
V
OUT
100mV/DIV
AC
COUPLED
I
LOAD
200mA/DIV
I
L
200mA/DIV
40µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 250mA
PULSE SKIPPING MODE
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Figure 1a Except for the Resistive Divider Resistor Values)
Burst Mode Operation
Pulse Skipping Mode Operation
Start-Up from Shutdown
Load Step