LTC3405A-1.8 Linear Technology, LTC3405A-1.8 Datasheet - Page 3

• Manufacturer Part Number: LTC3405A-1.8
• Description: 1.5V / 1.8V / 1.5MHz - 300mA Synchronous Step-Down Regulators in ThinSOT
• Manufacturer: Linear Technology

(From Figure1a)
TYPICAL PERFOR A CE CHARACTERISTICS
1.834
1.824
1.814
1.804
1.794
1.784
1.774
100
95
90
85
80
75
70
65
60
55
50
90
80
70
60
50
40
2.5
0.1
Efficiency vs Input Voltage
Efficiency vs Output Current
0
V
Output Voltage vs Load Current
I
Burst Mode OPERATION
V
OUT
OUT
OUT
Burst Mode
OPERATION
3.0
= 250mA
= 1.5V
100
= 1.8V
V
IN
1
OUTPUT CURRENT (mA)
= 4.2V
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
PULSE SKIPPING MODE
3.5
200
V
IN
= 2.7V
4.0
V
10
300
IN
I
OUT
= 3.6V
I
OUT
4.5
400
= 0.1mA
I
I
OUT
OUT
= 1mA
100
W
3405A1518 G02
= 10mA
= 100mA
5.0
3405A1518 G09
3405A1518 G05
500
U
1000
5.5
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
30
20
10
0
0
–50
0.1
R
0
Efficiency vs Output Current
Oscillator Frequency vs
Temperature
V
V
V
DS(ON
IN
IN
IN
–25
= 3.6V
= 3.6V
= 3.6V
SYNCHRONOUS
1
V
IN
) vs Input Voltage
OUTPUT CURRENT (mA)
1
= 4.2V
V
0
IN
2
TEMPERATURE ( C)
INPUT VOLTAGE (V)
SWITCH
= 4.2V
25
PULSE SKIPPING MODE
Burst Mode OPERATION
MAIN SWITCH
3
10
50
4
LTC3405A-1.5/LTC3405A-1.8
75
V
100
5
OUT
3405A1518 G03
3405A1518 G10
3405A1518 G07
100
= 1.8V
6
1000
125
7
100
1.2
1.0
0.8
0.6
0.4
0.2
1.8
1.7
1.6
1.5
1.4
1.3
1.2
90
80
70
60
50
40
0
–50
0.1
2
Efficiency vs Output Current
Oscillator Frequency vs
Supply Voltage
R
V
IN
DS(ON)
–25
= 2.7V
V
IN
= 5.5V
OUTPUT CURRENT (mA)
1
3
vs Temperature
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SUPPLY VOLTAGE (V)
0
TEMPERATURE ( C)
V
V
V
IN
IN
IN
V
= 4.2V
= 3.6V
= 3.6V
IN
25
SYNCHRONOUS SWITCH
MAIN SWITCH
= 2.7V
10
4
sn3405a1518 3405a1518fs
V
50
IN
= 4.2V
75
100
V
5
OUT
3405A1518 G04
3405A1518 G08
100
= 1.8V
3405F G11
3
1000
125
6