Datasheet

4
LTC3401
3401fb
Transient Response 50mA to 500mA
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Burst Mode Operation
Burst Mode Operation
V
OUT
200mV/DIV
550mA
50mA
I
OUT
C
OUT
= 22μF 200μs/DIV 3401 G04
L = 3.3μH
f
OSC
= 1MHz
V
OUT
AC
100mV/DIV
V
IN
= 1.2V 5ms/DIV 3401 G05
V
OUT
= 3.3V
C
OUT
= 100μF
I
OUT
= 250μA
MODE/SYNC PIN = HIGH
SW
1V/DIV
V
OUT
AC
100mV/DIV
V
IN
= 1.2V 200μs/DIV 3401 G06
V
OUT
= 3.3V
C
OUT
= 100μF
I
OUT
= 20mA
MODE/SYNC PIN = HIGH
SW
1V/DIV
Converter Efficiency 1.2V to 3.3V
OUTPUT CURRENT (mA)
EFFICIENCY (%)
80
100
60
0
40
20
70
90
50
30
10
0.1 10 100 1000
3401 G07
1
Burst Mode
OPERATION
3MHz
300kHz
1MHz
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3401 G08
0
1
300kHz
3MHz
1MHz
Burst Mode
OPERATION
V
IN
(V)
0.8
0
OUTPUT CURRENT (mA)
100
200
300
0.9
1
1.1 1.2
3401 G09
1.3
400
500
1.4
T
A
= 25°C
Converter Efficiency 2.4V to 3.3V
Start-Up Voltage
vs I
OUT
LOAD CURRENT (mA)
0.1
0
EFFICIENCY (%)
10
30
40
50
100
70
3401 G10
20
80
90
60
110
100
1000
1MHz
FIXED
FREQUENCY
Burst Mode OPERATION
Converter Efficiency 3.6V to 5V
Efficiency Loss Without Schottky
vs Frequency
FREQUENCY (MHz)
0.2
8
10
14
1.4 2.2
3401 G11
6
4
0.6 1.0
1.8 2.6 3.0
2
0
12
EFFICIENCY LOSS (%)
T
A
= 25°C
Current Limit
TEMPERATURE (°C)
–55
CURRENT (A)
1.55
1.60
1.65
65
125
3401 G12
1.50
1.45
1.40
–15 25 105
1.70
1.75
1.80