Datasheet

LTC3104
16
3104f
TYPICAL APPLICATIONS
Dual Lithium-Ion to 2.5V/300mA Regulator with 1.8V /10mA LDO
V
IN
C
BST
22nF
C
FF
12pF
BST
5V TO 9V
ON
OFF
RUN
SW
RUNLDO
MODE
V
CC
PGOOD
FBLDO
V
INLDO
V
LDO
FB
LTC3104
GND
R3
412k
L1: TDK VLCF4018T
L1
6.8µH
2.5V
300mA
1.8V
10mA
R2
931k
3104 TA02a
C
OUT
47µF
C
LDO
4.7µF
C1
1µF
C
IN
10µF
R4
825k
R1
294k
ON
OFF
Efficiency vs Output Current
12V to 3.3V/300mA Regulator with Accurate 5V UVLO,
Forced Continuous Operation and Independently Powered LDO
Start-Up with Ramped Input
Power into 100mA Load on V
OUT
V
IN
C
BST
22nF
BST
V
IN
12V
RUN
SW
RUNLDO
MODE
V
CC
PGOOD
PGOOD
FBLDO
V
INLDO
V
LDO
FB
LTC3104
GND
R3
665k
L1: WÜRTH 744031100
L1
10µH
3.3V
300mA
2.2V
10mA
V
INLDO
2.5V TO 12V
R2
2M
3104 TA03a
C
OUT
10µF
C
LDO
4.7µF
C2
10µF
C1
1µF
C
IN
10µF
R4
1.78M
1M
R1
442k
R6
1.47M
R5
280k
ON
OFF
C
FF
10pF
LOAD CURRENT (A)
80
EFFICIENCY (%)
90
100
70
85
95
0.0001 0.01 0.1 1
3104 TA02b
60
75
65
0.001
V
IN
= 5V
V
IN
= 9V
V
LDO
3V/DIV
V
OUT
2V/DIV
V
IN
20V/DIV
I
L
100mA/DIV
1ms/DIV
3104 TA03b
SOFT-START
FOLDBACK PERIOD