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| LTC3545-1_15 Datasheet, PDF (17/20 Pages) Linear Technology – Triple 800mA Synchronous Step-Down Regulator–2.25MHz | |||
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LTC3545/LTC3545-1
TYPICAL APPLICATIONS
R2
R1
511k
511k
E2
PGOOD2
E1
PGOOD1
VIN
2.7V TO 5.5V
C1
10μF
10V
1
16
SW1 LTC3545 GNDA
2
15
PGOOD1
3
VIN
14
RUN2
RUN1
4
13
PGOOD2
5
VFB1
12
SW2
6
VFB2
11
PGND
7
VFB3
10
PVIN
8
RUN3
9
SW3
SYNC/MODE
GND
17
C5
4.7μF
L1
1.5μH
C6
20pF
L2
1.5μH
C7
20pF
L3
1.5μH
C8
20pF
R3
191k
C2
10μF
6.3V
R4
60.4k
E3
VOUT1
2.5V AT 0.8A
E4
GND
R5
100k
C3
10μF
6.3V
R6
100k
E7
VOUT2
1.2V AT 0.8A
E6
GND
R7
165k
R8
110k
C4
10μF
6.3V
3545 TA02
E5
VOUT3
1.5V AT 0.8A
E8
GND
Overall Efï¬ciency vs
Channel 1 Load Current
100
90
80
70
60
50
40 TA = 25°C
30 VIN = 3.6V
20
VOUT = 2.5V
fOSC = 2.25MHz
10
CHANNEL 2 = 1.2V, ILOAD = 400mA
CHANNEL 3 = 1.5V, ILOAD = 400mA
0
0.1
1
10
100
CHANNEL 1 LOAD CURRENT (mA)
1000
3545 TA03
Burst Mode Ripple
VOUT3
AC COUPLED
20mV/DIV
IL3
250mA/DIV
SW3
2V/DIV
TA = 25°C
VIN = 3.6V
VOUT = 1.5V
ILOAD = 50mA
fOSC = 2.25MHz
1μs/DIV
3545 TA04
Figure 4. LTC3545 Low Ripple Burst Mode Operation
35451fb
17
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