LTC3100
8
3100fb
For more information www.linear.com/LTC3100
Step-Down DC/DC Converter
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current and V
IN
for V
O
= 1.2V
Efficiency vs Load Current and V
IN
for V
O
= 1.8V
No-Load Input Current
vs V
INBK
(Mode = Open)
Burst Mode Operation Threshold
Current vs V
IN
V
OUT
and I
IN
During Soft-Start
T
A
= 25癈, unless otherwise specified.
Output Voltage Ripple in Fixed
Frequency and Burst Mode Operation
Load Step Response,
Burst Mode Operation Enabled
10mA to 100mA
Load Step Response,
Fixed Frequency Mode
10mA to 100mA
LOAD CURRENT (mA)
30
50
80
0.01
10 100 1000
0
10
0.1 1
100
70
90
40
60
20
100
0.01
1000
1
10
0.1
3100 G19
V
IN
= 1.8V
V
IN
= 2.4V
V
IN
= 3.3V
PL, V
IN
= 1.8V
PL, V
IN
= 2.4V
PL, V
IN
= 3.3V
LOAD CURRENT (mA)
30
50
80
0.01
10 100 1000
0
10
0.1 1
100
70
90
40
60
20
100
0.01
1000
1
10
0.1
3100 G20
V
IN
= 2.4V
V
IN
= 3.3V
V
IN
= 5V
PL, V
IN
= 2.4V
PL, V
IN
= 3.3V
PL, V
IN
= 5V
V
INBK
(V)
1.5
2.5
3.5
2
3
4 4.5 5
5
0
15
20
10
3100 G21
V
INBK
(V)
60
70
50
40
2.5
3.5
2
3
4 4.5 5
10
0
30
80
20
3100 G22
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 1.5V
3100 G24
5祍/DIV
50mV/DIV
50mV/DIV
C
OUT
= 10礔
3100 G25
200祍/DIV
100mA/DIV
50mV/DIV
C
OUT
= 10礔
3100 G26
200祍/DIV
50mA/DIV
50mV/DIV
C
OUT
= 10礔
3100 G23
2ms/DIV
INPUT
CURRENT
50mA/DIV
V
OUT
0.5V/DIV
STARTUP, 200mA LOAD
V
IN
= 2.4V
V
OUT
= 1.2V
C
OUT
= 10礔
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