LTC3405 Linear Technology, LTC3405 Datasheet - Page 3

• Manufacturer Part Number: LTC3405
• Description: Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger
• Manufacturer: Linear Technology

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(From Figure1a Except for the Resistive Divider Resistor Values)
TYPICAL PERFOR A CE CHARACTERISTICS
100
1.8
1.7
1.6
1.5
1.4
1.3
1.2
95
90
85
80
75
70
65
60
55
50
90
80
70
60
50
40
2.5
0.1
2
Efficiency vs Input Voltage
Efficiency vs Output Current
Oscillator Frequency vs
Supply Voltage
Burst Mode OPERATION
V
I
OUT
V
OUT
IN
3.0
= 4.2V
= 250mA
= 1.8V
OUTPUT CURRENT (mA)
3
1
SUPPLY VOLTAGE (V)
INPUT VOLTAGE (V)
V
3.5
IN
V
= 3.6V
IN
= 2.7V
4.0
10
4
I
OUT
I
OUT
4.5
= 0.1mA
I
I
OUT
OUT
= 1mA
100
V
5
W
OUT
= 10mA
= 100mA
5.0
= 1.3V
3405 G02
3405 G05
3405 G08
U
1000
5.5
6
0.814
0.809
0.804
0.799
0.794
0.789
0.784
1.834
1.824
1.814
1.804
1.794
1.784
1.774
100
90
80
70
60
50
40
30
20
10
0
–50
0.1
0
Efficiency vs Output Current
Output Voltage vs Load Current
Reference Voltage vs
Temperature
V
V
PULSE SKIPPING MODE
V
IN
V
IN
IN
IN
–25
= 3.6V
Burst Mode
OPERATION
= 3.6V
= 3.6V
100
= 3.6V
V
IN
OUTPUT CURRENT (mA)
1
= 4.2V
V
LOAD CURRENT (mA)
0
IN
TEMPERATURE ( C)
200
= 4.2V
25
PULSE SKIPPING MODE
Burst Mode OPERATION
300
10
50
400
75
V
100
OUT
500
100
= 1.8V
3405 G03
3405 G09
3405 G06
1000
125
600
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
100
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
90
80
70
60
50
40
0
–50
0.1
Efficiency vs Output Current
Oscillator Frequency vs
Temperature
R
0
V
DS(ON
IN
–25
= 3.6V
V
SYNCHRONOUS
1
IN
) vs Input Voltage
= 5.5V
OUTPUT CURRENT (mA)
1
0
V
TEMPERATURE ( C)
2
INPUT VOLTAGE (V)
V
SWITCH
IN
IN
V
= 4.2V
= 3.6V
IN
25
MAIN SWITCH
3
= 2.7V
10
LTC3405
50
4
75
100
5
V
OUT
sn3405 3405fs
100
= 1.8V
3405 G04
6
3405 G10
3405 G07
3
1000
125
7