Datasheet
LTC3103
6
3103f
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted
Automatic Burst Mode Threshold
vs Supply Voltage
Load Step
(Automatic Burst Mode Operation)
Load Step
(Forced Continuous Operation)
Load Regulation
(Automatic Burst Mode Operation)
Load Regulation
(Automatic Burst Mode Operation)
Load Regulation
(Automatic Burst Mode Operation)
Maximum Duty Cycle
vs Input Voltage
Minimum Input Voltage at
Maximum Duty Cycle vs Load
Current
Minimum Input Voltage at
Maximum Duty Cycle vs Load
Current
V
OUT
200mV/DIV
AC-COUPLED
I
L
200mA/DIV
I
LOAD
200mA/DIV
200µs/DIV
3103 G19
I
LOAD
= LOAD STEP, 5mA TO 300mA
V
IN
= 10V
C
IN
= 10µF
L = 10µH
V
OUT
= 2.2V
C
OUT
= 47µF
V
OUT
50mV/DIV
AC-COUPLED
I
L
100mA/DIV
I
LOAD
100mA/DIV
200µs/DIV
3103 G20
I
LOAD
= LOAD STEP, 50mA TO 200mA
V
IN
= 10V
L = 10µH
V
OUT
= 2.5V
C
OUT
= 22µF
INPUT VOLTAGE (V)
0
0
BURST THRESHOLD (I
LOAD
, mA)
20
60
80
100
140
4
8
10
3103 G27
40
160
120
2 6
12
14
16
V
OUT
= 1.2V
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 3.3V
V
OUT
= 5V
LOAD CURRENT (mA)
0
2.5
INPUT VOLTAGE (V)
3.0
3.5
4.0
4.5
5.5
50
100 150 200
3103 G21
250 300
5.0
V
OUT
= 4.2V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 2.2V
V
OUT
= 1.8V
V
OUT
= 1.5V
LOAD CURRENT (mA)
0
5
INPUT VOLTAGE (V)
7
9
11
50
100
150 200
3103 G22
250
13
15
6
8
10
12
14
300
V
OUT
= 12V
V
OUT
= 9V
V
OUT
= 5V
I
LOAD
(mA)
0
–2.0
CHANGE IN V
OUT
(%)
–1.5
–1.0
–0.5
0
0.5
1.0
10 20 30 40
3103 G23
50
NORMALIZED AT I
LOAD
= 100mA
V
IN
= 10V
V
OUT
= 5V
C
FF
= 12pF
C
OUT
= 68µF
C
OUT
= 47µF
C
OUT
= 22µF
I
LOAD
(mA)
0
–2.0
CHANGE IN V
OUT
(%)
–1.5
–1.0
–0.5
0
20 40
60
80
3103 G24
0.5
1.0
10 30
50
70
NORMALIZED AT I
LOAD
= 100mA
V
IN
= 10V
V
OUT
= 3.3V
C
FF
= 12pF
C
OUT
= 68µF
C
OUT
= 47µF
C
OUT
= 33µF
I
LOAD
(mA)
0
CHANGE IN V
OUT
(%)
–1.5
–1.0
–0.5
60
100
3103 G25
–2.0
–2.5
–3.0
20 40 80
0
0.5
1.0
NORMALIZED AT I
LOAD
= 100mA
V
IN
= 10V
V
OUT
= 1.8V
C
FF
= 12pF
C
OUT
= 100µF
C
OUT
= 68µF
C
OUT
= 47µF
INPUT VOLTAGE (V)
2
85
90
100
5 7
3103 G26
80
75
3 4
6 8 9
70
65
95
MAXIMUM DUTY CYCLE (%)
I
OUT
= 1mA
I
OUT
= 300mA