Datasheet

LTC3419
4
3419fa
V
IN
(V)
2.5
LEAKAGE CURRENT (nA)
3.0
2.5
1.5
2.0
1.0
0.5
0
4.0 5.0
3419 G07
3.0 3.5 4.5 5.
5
MAIN SWITCH
SYNCHRONOUS
SWITCH
V
IN
(V)
2.5
R
DS(ON)
(Ω)
0.50
0.45
0.35
0.40
0.30
0.25
0.20
4.0 5.0
3419 G08
3.0 3.5 4.5 6.
0
5.5
MAIN SWITCH
SYNCHRONOUS
SWITCH
TEMPERATURE (°C)
–50
V
FB
(% ERROR)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
25 75
3419 G04
–25 0 50 100 12
5
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.8
1.9
25 75
3419 G05
–25 0 50 100 12
5
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.7V
TEMPERATURE (°C)
–50
SUPPLY CURRENT (μA)
55
50
40
45
30
35
20
25
15
25 75
3419 G06
–25 0 50 125100
RUN1 = RUN2 = V
IN
I
LOAD
= 0A
V
IN
= 5.5V
V
IN
= 2.7V
V
IN
(V)
2.5
EFFICIENCY (%)
100
90
70
80
60
40
50
30
4.0 5.0
3419 G03
3.0 3.5 4.5 5.
5
V
OUT
= 1.8V
I
OUT
= 600mA
I
OUT
= 100mA
I
OUT
= 1mA
I
OUT
= 0.1mA
I
OUT
= 10mA
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation Pulse Skip Mode Operation Effi ciency vs Input Voltage
Reference Voltage
vs Temperature
Oscillator Frequency
vs Temperature
Supply Current
vs Temperature
Switch Leakage vs Input Voltage
Switch On-Resistance
vs Input Voltage
Switch On-Resistance
vs Temperature
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
0.6
0.5
0.4
0.3
0.2
0.1
25 75
3419 G09
–25 0 50 100 125
SYNCHRONOUS SWITCH
MAIN SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 25mA
SW
2V/DIV
I
L
100mA/DIV
V
OUT
50mV/DIV
AC-COUPLED
2μs/DIV
3419 G01
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 5mA
SW
2V/DIV
I
L
100mA/DIV
V
OUT
50mV/DIV
AC-COUPLED
5μs/DIV
3419 G02
T
A
= 25°C, V
IN
= 3.6V, unless otherwise noted.