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LTC3548 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3548
Description  Dual Synchronous, 400mA/800mA, 2.25MHz
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3548 Datasheet(HTML) 13 Page - Linear Technology

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LTC3548
13
3548fc
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
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
TYPICAL APPLICATIONS



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