Datasheet

4
LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
Dynamic Supply Current
vs Supply Voltage
Dynamic Supply Current
vs Temperature
Switch Leakage vs Temperature
Switch Leakage vs Input Voltage
SUPPLY VOLTAGE (V)
2
0
SUPPLY CURRENT (µA)
200
600
800
1000
4
1800
3405A1518 G12
400
3
2.5
4.5 5
3.5 5.5
1200
1400
1600
PULSE SKIPPING MODE
BURST MODE OPERATION
V
OUT
= 1.8V
I
LOAD
= 0A
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
3405F G14
MAIN SWITCH
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (pA)
60
50
40
30
20
10
0
1
234
3405F G15
56
RUN = 0V
MAIN SWITCH
SYNCHRONOUS
SWITCH
SW
5V/DIV
V
OUT
100mV/DIV
AC COUPLED
I
L
100mA/DIV
3405A1518 G16
5µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
20mA
SW
5V/DIV
V
OUT
10mV/DIV
AC
COUPLED
I
L
100mA/DIV
3405A1518 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
3405A1518 G18
100µs/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
=
250mA
3405A1518 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)
Burst Mode Operation
Pulse Skipping Mode Operation
Start-Up from Shutdown
Load Step
TEMPERATURE (°C)
–50
300
340
25 75
3405A1518 G13
260
–25 0
50 100 125
220
180
140
100
60
20
0
SUPPLY CURRENT (µA)
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0A
PULSE SKIPPING MODE
BURST MODE OPERATION