Datasheet

4
LTC3404
3404fb
OUTPUT CURRENT (mA)
70
EFFICIENCY (%)
80
90
65
75
85
0.1 10 100 1000
3404 G04
60
1
V
IN
= 3V
V
IN
= 6V
V
OUT
= 1.8V
L = 4.7μH
V
IN
= 4.2V
V
IN
= 3.6V
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Oscillator Frequency
vs Temperature
Efficiency vs Output Current
TEMPERATURE (°C)
–50
REFERENCE VOLTAGE (V)
0.814
0.809
0.804
0.799
0.794
0.789
0.784
25 75
3404 G05
–25 0
50 100 125
V
IN
= 3.6V
Oscillator Frequency
vs Supply Voltage
Reference Voltage
vs Temperature
Output Voltage vs Load Current
OUTPUT CURRENT (mA)
80
75
EFFICIENCY (%)
85
90
95
100
0.1 10 100 1000
3404 G4a
70
65
1
V
IN
= 6V
V
IN
= 3.6V
V
OUT
= 3.1V
L = 4.7μH
V
IN
= 4.2V
Efficiency vs Output Current
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
1.55
1.50
1.45
1.40
1.35
1.30
1.25
10075
3404 G06
–25
0
5025
125
V
IN
= 3.6V
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (MHz)
1.25
1.35
1.30
8
3404 G07
2
4
6
1.55
1.50
1.45
1.40
LOAD CURRENT (mA)
0
1.75
1.76
1.77
OUTPUT VOLTAGE (V)
1.78
1.80
1.81
1.82
200
400
3404 G08
1.79
600
800
1.83
PULSE SKIPPING MODE
V
IN
= 3.6V
L = 4.7μF
Efficiency vs Input Voltage Efficiency vs Output Current Efficiency vs Output Current
INPUT VOLTAGE (V)
2
EFFICIENCY (%)
75
80
5
7
3404 G01
70
60
85
65
34 6
90
95
8
Burst Mode OPERATION
V
OUT
= 2.5V
L = 4.7μH
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 300mA
I
OUT
= 0.1mA
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3404 G02
0
1
V
IN
= 3.6V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 4.2V
PULSE SKIPPING MODE
Burst Mode OPERATION
V
OUT
= 1.8V
L = 4.7μH
OUTPUT CURRENT (mA)
55
EFFICIENCY (%)
65
70
80
90
0.1 10 100 1000
3404 G03
1
75
60
50
85
L = 4.7μH
L = 3.5μH
Burst Mode OPERATION
V
IN
= 6V
V
OUT
= 2.5V