Datasheet

LTC3407-3
4
34073fb
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs
Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature
Effi ciency vs V
IN
Effi ciency vs Load Current Effi ciency vs Load Current
T
A
= 25°C unless otherwise specifi ed.
0.615
0.610
0.605
0.600
0.595
0.590
0.585
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
–50 25 75
34073 G07
–25 0
50 100 125
V
IN
= 3.6V
V
IN
(V)
1
500
450
400
350
300
250
200
46
34073 G08
2
3
57
R
DS(ON)
(mΩ)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
TEMPERATURE (°C)
–50
550
500
450
400
350
300
250
200
150
100
25 75
34073 G09
–25 0
50 100 150125
R
DS(ON)
(mΩ)
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
= 4.2V
V
IN
= 3.6V
INPUT VOLTAGE (V)
2
34073 G10
3
456
100
95
90
85
80
75
70
65
60
55
50
EFFICIENCY (%)
V
OUT
= 1.8V
Burst Mode OPERATION
CH2 OFF
800mA
10mA
100mA
1mA
LOAD CURRENT (mA)
1
80
EFFICIENCY (%)
90
100
10 100 1000
34073 G14
70
75
85
95
65
60
V
IN
= 5V,
V
OUT
= 3.3V
NO LOAD ON
OTHER CHANNEL
Burst Mode OPERATION
PULSE-SKIPPING
MODE
LOAD CURRENT (mA)
1
EFFICIENCY (%)
100
90
80
70
60
10 100 1000
34073 G11
V
IN
= 3.6V, V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
Burst Mode OPERATION
PULSE-SKIPPING
MODE
Load Step
Oscillator Frequency vs
Temperature
Oscillator Frequency Deviation
vs Supply Voltage
34073 G04
V
IN
= 5V
V
OUT
= 3.3V
I
LOAD
= 80mA TO 800mA
CIRCUIT OF FIGURE 1
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
20μs/DIV
2.5
2.4
2.3
2.2
2.1
2.0
FREQUENCY (MHz)
TEMPERATURE (°C)
–50 25 75
34073 G05
–25 0
50 100 125
V
IN
= 3.6V
10
8
6
4
2
0
–2
–4
–6
–8
–10
FREQUENCY DEVIATION (%)
SUPPLY VOLTAGE (V)
2
34073 G06
3
456