LTC3545_15 Datasheet, PDF (18/20 Pages) Linear Technology – Triple 800mA Synchronous Step-Down Regulator–2.25MHz

LTC3545/LTC3545-1
TYPICAL APPLICATIONS
L1
1.5μH
C6
20pF
C5
R9
R2
R1
10μF
511k
511k
511k
1
16
SW1 LTC3545-1 GNDA
E9
E2
E1
PGOOD3 PGOOD2 PGOOD1
2
PGOOD1
3
15
V_IN
14
RUN2
RUN1
L2
4
PGOOD2
5
13
V_FB1
12
1.5μH
V_IN
2.5V TO 5.5V
SW2
6
PGND
V_FB2
11
V_FB3
C7
20pF
7
10
P_VIN
RUN3
C1
4.7μF
8
SW3
9
PGOOD3
GND
17
L3
1.5μH
C8
20pF
3-Channel Power Sequencing
RUN1
V_OUT1
V_OUT2
V_OUT3
PGOOD3
T_A = 25°C
V_IN = 3.6V
400μs/DIV
3545 TA06
Figure 5. LTC3545-1 Three PGOODs and Power Sequencing
E3
R3
100k
C2
10μF
V_OUT1
1.2V AT 0.8A
E4
GND
R4
100k
E7
R5
165k
C3
V_OUT2
10μF
1.5V AT 0.8A
E6
GND
R6
110k
R7
133k
R8
66.5k
C4
10μF
3545 TA05
E5
V_OUT3
1.8V AT 0.8A
E8
GND
35451fb
18