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LTC3548 데이터시트(PDF) 13 Page - Linear Technology

부품명 LTC3548
상세설명  Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator
PDF  16 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3548 데이터시트(HTML) 13 Page - Linear Technology

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LTC3548
13
3548fa
Low Ripple Buck Regulators Using Ceramic Capacitors
RUN2
VIN
VIN = 2.5V
TO 5.5V
VOUT2 = 1.8V
AT 400mA
VOUT1 = 1.2V
AT 800mA
RUN1
POR
SW1
VFB1
GND
VFB2
SW2
MODE/SYNC
LTC3548
C1
10μF
R5
100k
POWER-ON
RESET
C4, 33pF
C5, 68pF
L1
4.7μH
L2
10μH
R4
887k
R2
604k
R1
604k
R3
442k
C3
10μF
C2
10μF
3548 TA03
C1, C2, C3: TDK C2012X5R0J106M
L1: SUMIDA CDRH2D18/HP-4R7NC
L2: SUMIDA CDRH2D18/HP-100NC
LOAD CURRENT (mA)
10
100
1000
3548 TA03b
100
95
90
85
80
75
70
65
60
55
50
1.8V
1.2V
VIN = 3.3V
PULSE SKIP MODE
NO LOAD ON OTHER CHANNEL
Efficiency vs Load Current
TYPICAL APPLICATIO S
Figure 4. LTC3548 Layout Diagram (See Board Layout Checklist)
RUN2
VIN
VIN
VOUT2
VOUT1
RUN1
POR
SW1
VFB1
GND
VFB2
SW2
MODE/SYNC
LTC3548
CIN
C4
C5
L1
L2
R4
R2
R1
R3
COUT2
COUT1
3548 F04
BOLD LINES INDICATE HIGH CURRENT PATHS
RUN2 VIN
VIN = 2.5V*
TO 5.5V
VOUT2 = 2.5V*
AT 400mA
VOUT1 = 1.8V
AT 800mA
RUN1
POR
SW1
VFB1
GND
VFB2
SW2
MODE/SYNC
LTC3548
C1
10μF
R5
100k
POWER-ON
RESET
C4, 33pF
C5, 68pF
L1
2.2μH
L2
4.7μH
R4
887k
R2
604k
R1
301k
R3
280k
C3
4.7μF
C2
10μF
3548 F03
C1, C2, C3: TAIYO YUDEN JMK212BJ106MG
C3: TAIYO YUDEN JMK212BJ475MG
L1: MURATA LQH32CN2R2M11
L2: MURATA LQH32CN4R7M23
*VOUT CONNECTED TO VIN FOR VIN ≤ 2.8V (DROPOUT)
Figure 3. LTC3548 Typical Application
APPLICATIONS INFORMATION



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