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LTC3411_15 Datasheet, PDF (18/24 Pages) Linear Technology – 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter | |||
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LTC3411
TYPICAL APPLICATIONS
VIN
2.63V TO
5.5V
C1
22μF
PGND
RS1
BM 1M
FC
PS RS2
1M
R3
13k
SVIN
PVIN PGOOD
LTC3411 SW
SYNC/MODE
ITH
VFB
SHDN/RT
SGND PGND
C3
1000pF
R5
100k
PGOOD
L1
2.2μH
R2 887K
3.3V 2.5V 1.8V
C4 22pF
R4
R1A R1B R1C
324k 280k 412k 698k
SGND
SGND
GND
SGND
VOUT
1.8V/2.5V/3.3V
AT 1.25A
C2
22μF
3411 F07a
PGND
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
C1, C2: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A914BYW-2R2M (D52LC SERIES)
Figure 7. General Purpose Buck Regulator Using Ceramic Capacitors
Efï¬ciency vs Load Current
100
Burst Mode
95 OPERATION (BM)
90
85 PULSE SKIP FORCED
(PS)
CONTINUOUS (FC)
80
75
70
VIN = 3.3V
65
VOUT = 2.5V
fO = 1MHz
60
1
10
100
1000 10000
LOAD CURRENT (mA)
3411 F07b
3411fb
18
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