Datasheet

3
LTC3426
3426fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
1.0
FREQUENCY (MHz)
1.1
1.2
1.3
1.40
–30 –10 10 30
3426 G01
50 70 90
V
IN
(V)
1.8
80
EFFICIENCY (%)
84
88
92
2.2
2.6
3 3.4
LT1108 • TPC12
3.8
96
100
82
86
90
94
98
4.2
FIGURE 1 CIRCUIT
T
A
= 25°C
I
LOAD
= 150mA
V
OUT
= 5V
C
OUT
= 22µF
L = 2.2µH
V
IN
(V)
1.8
0.3
I
OUT(MAX)
(A)
0.5
0.7
0.9
1.1
1.3
2.2
2.6 3 3.4
3426 G03
3.8 4.2
FIGURE 1 CIRCUIT
T
A
= 25°C
V
OUT
= 5V
C
OUT
= 22µF
L = 2.2µH
Efficiency vs V
IN
I
OUT(MAX)
vs V
IN
R
DS(ON)
vs Temperature
TEMPERATURE (°C)
–50
0.05
R
DS(ON)
(Ω)
0.07
0.09
0.11
–25
0
25 50
3426 G04
75
0.13
0.15
0.06
0.08
0.10
0.12
0.14
100
V
OUT
= 2.5V
V
OUT
= 5V
V
OUT
= 3.3V
TEMPERATURE (°C)
–50
1.19
FB VOLTAGE (V)
1.20
1.21
1.22
1.23
1.25
–25
02550
3426 G05
75 100
1.24
FB Pin Voltage
V
OUT
500mV/DIV
SW
2V/DIV
100ns/DIVV
IN
= 1.8V
V
OUT
= 3.3V
C
OUT
= 22µF
L = 2.5µH
3426 G06
I
L
200mA/DIV
Switching Waveforms
SW Pin Antiringing Operation
V
OUT
Transient Response
SW
1V/DIV
100ns/DIVV
IN
= 1.8V
V
OUT
= 3.3V
3426 G07
I
L
50mA/DIV
40µs/DIVV
IN
= 1.8V
V
OUT
= 3.3V
C
OUT
= 22µF
L = 2.5µH
3426 G08
I
L
500mA/DIV
I
OUT
200mA/DIV
V
OUT
500mV/DIV
250mA
500mA