Datasheet

LTC3407A
4
3407afa
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Input Voltage
Oscillator Frequency
vs Temperature
Oscillator Frequency
vs Supply Voltage
Reference Voltage
vs Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature
T
A
= 25°C unless otherwise specifi ed.
Load Step Soft Start
3407 G03
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA TO 600mA
CIRCUIT OF FIGURE 3
V
OUT2
100mV/DIV
V
OUT1
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20µs/DIV
3407 G04
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 500mA
CIRCUIT OF FIGURE 4
V
IN
2V/DIV
V
OUT1
1V/DIV
I
L
500mA/DIV
1ms/DIV
INPUT VOLTAGE (V)
2
0
EFFICIENCY (%)
10
30
40
50
100
100mA
1mA
70
3
4
3407A G05
20
80
90
60
5
6
10mA
V
OUT
= 1.8V
CIRCUIT OF FIGURE 3
600mA
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
FREQUENCY (MHz)
TEMPERATURE (°C)
–50 25 75
3407A G06
–25 0
50 100 125
1.8
1.7
1.6
1.5
1.4
1.3
1.2
OSCILLATOR FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
2
3407A G07
3
456
0.615
0.610
0.605
0.600
0.595
0.590
0.585
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
–50 25 75
3407A G08
–25 0
50 100 125
V
IN
= 3.6V
V
IN
(V)
1
500
450
400
350
300
250
200
46
3407A G09
2
3
57
R
DS(ON)
(m)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
TEMPERATURE (°C)
–50
550
500
450
400
350
300
250
200
150
100
25 75
3407A G10
–25 0
50 100 150125
R
DS(ON)
(m)
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 2.7V