Datasheet

LTC3407
4
3407fa
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs
Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature
Effi ciency vs Load Current Effi ciency vs Load Current Load Regulation
0.615
0.610
0.605
0.600
0.595
0.590
0.585
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
–50 25 75
3407 G07
–25 0
50 100 125
V
IN
= 3.6V
V
IN
(V)
1
500
450
400
350
300
250
200
46
3407 G08
2
3
57
R
DS(ON)
(mΩ)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
T
A
= 25°C
TEMPERATURE (°C)
–50
550
500
450
400
350
300
250
200
150
100
25 75
3407 G09
–25 0
50 100 150125
R
DS(ON)
(mΩ)
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 2.7V
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
10 100 1000
3407 G10
3.3V
2.7V
4.2V
V
OUT
= 2.5V Burst Mode OPERATION
CIRCUIT OF FIGURE 1
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
10 100 1000
3407 G11
V
IN
= 3.6V, V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
Burst Mode OPERATION
PULSE-SKIPPING
MODE
LOAD CURRENT (mA)
1
V
OUT
ERROR (%)
4
3
2
1
0
–1
–2
–3
–4
10 100 1000
3407 G12
V
IN
= 3.6V, V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
Burst Mode OPERATION
PULSE-SKIPPING
MODE
Effi ciency vs Input Voltage
Oscillator Frequency vs
Temperature
Oscillator Frequency vs Supply
Voltage
INPUT VOLTAGE (V)
2
3407 G04
3
456
100
95
90
85
80
75
70
65
60
EFFICIENCY (%)
V
OUT
= 1.8V
CIRCUIT OF FIGURE 1
600mA
10mA
100mA
1mA
T
A
= 25°C
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
3407 G05
–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
3407 G06
3
456
T
A
= 25°C