Datasheet

LTC3548A
16
3548afa
TYPICAL APPLICATIONS
Figure 4. Low Ripple Buck Regulators with Soft-Start
Efficiency vs Load Current
RUN/SS2
V
IN
V
IN
= 2.5V TO 5.5V
V
OUT2
2.5V
400mA
V
OUT1
1.2V
800mA
RUN/SS1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3548A
C
IN
10μF
R7
100k
R6
4.7M
R5
4.7M
POWER-ON
RESET
C1 22pFC2 22pF
L1
4.7μH
L2
10μH
R4
887k
R2
604k
R1
604k
R3
280k
C
OUT2
10μF
C4
680pF
C3
680pF
C
OUT1
10μF
3548A F04a
C
IN
, C
OUT1
, C
OUT2:
TAIYO YUDEN JMK316BJ106ML
L1: TDK VLF3012ST-4R7MR91
L2: TDK VLF3012ST-100MR59
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3548A F04b
2.5V
V
IN
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
1.2V