Datasheet

LTC3407A-2
14
3407a2f
TYPICAL APPLICATIO S
U
RUN/SS2 V
IN
V
IN
= 2.5V
TO 5.5V
V
OUT2
= 2.5V
AT 800mA
V
OUT1
= 1.8V
AT 800mA
RUN/SS1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3407A-2
C1
10μF
R5
100k
POWER-ON
RESET
C4, 22pFC5, 22pF
L1
2.2μH
L2
2.2μH
R4
887k
R2
604k
R1
301k
R3
280k
C3
10μF
C2
10μF
3407A2 TA03
C1, C2, C3: TAIYO YUDEN JMK316BJ106MD
L1, L2: TDK VLF3010AT-2R2M1R0
Figure 3. 1mm Height Core Supply
Efficiency vs Load Current
Figure 4. Low Ripple Buck Regulators with Soft-Start
RUN/SS2
V
IN
V
IN
= 2.5V TO 5.5V
V
OUT2
= 2.5V
AT 800mA
V
OUT1
= 1.2V
AT 800mA
RUN/SS1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3407A-2
C
IN
10μF
R7
100k
R6
4.7MΩ
R5
4.7MΩ
POWER-ON
RESET
C1, 22pFC2, 22pF
L1
4.7μH
L2
4.7μH
R4
887k
R2
604k
R1
604k
R3
280k
C
OUT2
10μF
C4
680pF
C3
680pF
C
OUT1
10μF
3407A2 TA04
C
IN
, C
OUT1
, C
OUT2:
TAIYO YUDEN JMK316BJ106ML L1, L2: TDK VLF3012AT-4R7M74
Efficiency vs Load Current
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3407A2 TA03b
2.5V
V
IN
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
1.8V
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3407A2 TA04b
2.5V
V
IN
= 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
1.2V