LTC3548A Datasheet, PDF (17/20 Pages) Linear Technology – Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548A
TYPICAL APPLICATIONS
V_IN = 2.5V TO 5.5V
R6
4.7M
C_IN
10μF
C4
680pF _VOUT2
2.5V
400mA
L2
10μH
C2 22pF
V_IN
POR
RUN/SS2 RUN/SS1
LTC3548A
SW2
SW1
R7
100k _POWER-ON
RESET
L1
4.7μH
C1 22pF
R5
4.7M
C3
V_OUT1 ^680pF
1.2V
800mA
C_OUT2
10μF
R4
887k
R3
280k
V_FB2
V_FB1
MODE/SYNC GND
C_IN, C_OUT1, C_OUT2: TAIYO YUDEN JMK316BJ106ML
R1 ^R2
604k ^604k
C_OUT1
10μF
3548A F04a
L1: TDK VLF3012ST-4R7MR91
L2: TDK VLF3012ST-100MR59
Figure 4. Low Ripple Buck Regulators with Soft-Start
Efficiency vs Load Current
100
90 ^2.5V
80
1.2V
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 F04b
3548af
17