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| LTC3544B_15 Datasheet, PDF (15/18 Pages) Linear Technology – Quad Synchronous Step-Down Regulator | |||
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LTC3544B
Applications information
VOUT2
1.5V
VOUT3
0.8V
VSUPPLY
3.6V
C2
4.7µF
R3
93.1k
R4
107k
R5
C3
0Ω
4.7µF R6
100k
L2
4.7µH
C6
20pF
L3
4.7µH
C7
20pF
C9
4.7µF
15
7
C10
4.7µF
16
VCC
RUN200B
4 SW200B
PVIN
12
RUN100
SW100 13
1 VFB200B
3 RUN200A
5 SW200A
LTC3544B
VFB100 11
RUN300 9
SW300 8
2 VFB200A
GNDA GNDA
17 14
VFB300 10
PGND
6
L1
10µH
L4
4.7µH
Figure 5
C5 R1
20pF 59k
R2
118k
VOUT1
1.2V
C1
4.7µF
C8 R7
20pF 162k
R8
76.8k
VOUT2
2.5V
C4
4.7µF
3544B F05a
Efficiency vs Output Currentâ300mA Channel,
All Other Channels Off
100
VOUT = 2.5V
90 TA = 25°C
80
70
60
50
40
30
20
10
0
0.0001
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
0.001
0.01
0.1
LOAD CURRENT (A)
1
3544B F05b
Transient Response
VOUT300
100mV/DIV
AC-COUPLED
IL
250mA/DIV
ILOAD
250mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 2.5V
TA = 25°C
LOAD STEP = 300µA TO 300mA
3544B F05c
3544bfb
15
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