Datasheet

LTC3104
6
3104f
Automatic Burst Mode Operation Forced Continuous Operation
Start-Up into Pre-Biased Output
(Automatic Burst Mode Operation)
Start-Up into Pre-Biased Output
(Forced Continuous Operation)
Start-Up from Shutdown
(Automatic Burst Mode Operation)
Start-Up from Shutdown
(Forced Continuous Operation)
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted
Load Step
(Automatic Burst Mode Operation)
Load Step
(Forced Continuous Operation)
Minimum Input Voltage at
Maximum Duty Cycle vs Load
Current
V
OUT
50mV/DIV
AC-COUPLED
I
L
100mA/DIV
10µs/DIV
3104 G13
I
LOAD
= 25mA
V
IN
= 10V
C
IN
= 10µF
L = 10µH
V
OUT
= 2.5V
C
OUT
= 22µF
V
OUT
20mV/DIV
AC-COUPLED
I
L
100mA/DIV
1µs/DIV
3104 G14
I
LOAD
= 25mA
V
IN
= 10V
C
IN
= 10µF
L = 10µH
V
OUT
= 2.5V
C
OUT
= 22µF
RUN
5V/DIV
V
OUT
1V/DIV
PGOOD
5V/DIV
I
L
100mA/DIV
500µs/DIV
3104 G15
I
LOAD
= 2mA
V
IN
= 10V
C
IN
= 10µF
L = 10µH
V
OUT
= 2.5V
C
OUT
= 47µF
BURST CURRENT
PULSES
SOFT-START
PERIOD
V
BST
REFRESH
CURRENT PULSES
RUN
5V/DIV
V
OUT
1V/DIV
I
L
100mA/DIV
PGOOD
5V/DIV
500µs/DIV
3104 G16
I
LOAD
= 2mA
V
IN
= 10V
L = 10µH
V
OUT
= 2.5V
V
BST
REFRESH
CURRENT PULSES
RUN
5V/DIV
PGOOD
5V/DIV
V
OUT
1V/DIV
I
L
100mA/DIV
500µs/DIV
3104 G17
I
LOAD
= 25mA
V
IN
= 10V
L = 10µH
V
OUT
= 2.5V
RUN
5V/DIV
PGOOD
5V/DIV
V
OUT
1V/DIV
I
L
100mA/DIV
500µs/DIV
3104 G18
I
LOAD
= 25mA
V
IN
= 10V
L = 10µH
V
OUT
= 2.5V
SOFT-START/
FOLDBACK PERIOD
V
OUT
200mV/DIV
AC-COUPLED
I
L
200mA/DIV
I
LOAD
200mA/DIV
200µs/DIV
3104 G19
I
LOAD
= LOAD STEP, 5mA TO 300mA
V
IN
= 10V
C
IN
= 10µF
L = 10µH
V
OUT
= 2.5V
C
OUT
= 47µF
V
OUT
50mV/DIV
AC-COUPLED
I
L
100mA/DIV
I
LOAD
100mA/DIV
200µs/DIV
3104 G20
I
LOAD
= LOAD STEP, 50mA TO 200mA
V
IN
= 10V
L = 10µH
V
OUT
= 2.5V
C
OUT
= 22µF
LOAD CURRENT (mA)
0
2.5
INPUT VOLTAGE (V)
3.0
3.5
4.0
4.5
5.5
50
100 150 200
3104 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