LTC3548A Datasheet, PDF (16/20 Pages) Linear Technology – Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548A
TYPICAL APPLICATIONS
V_IN
2.5V TO 5.5V
C1
10μF
V_OUT2
2.5V
400mA
L2
4.7μH
C5 22pF
RUN/SS2 V_IN RUN/SS1
MODE/SYNC
POR
SW2 LTC3548A SW1
R5
100k
POWER-ON
L1 ^RESET
2.2μH
C4 22pF
V_OUT1
1.8V
800mA
C3
4.7μF
R4
887k
V_FB2
V_FB1
R3
280k
GND
R1
R2
301k ^604k
C1, C2, C3: TAIYO YUDEN JMK316BJ106MD
L1: TDK VLF3010AT-2R2M1R0-1
L2: TDK VLF3010AT-4R7MR70-1
Figure 3. 1mm Height Core Supply
C2
10μF
3548 F03a
Efficiency vs Load Current
100
90 ^2.5V
80
1.8V
70
60
50
40
30
20 _{VIN = 3.3V}
10 ^{Burst Mode OPERATION}
NO LOAD ON OTHER CHANNEL
0
1
10
100
LOAD CURRENT (mA)
1000
3548A F03b
3548af
16