LTC3411 Datasheet, PDF (16/20 Pages) Linear Technology – 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

LTC3411
TYPICAL APPLICATIO S
V_IN
2.63V TO
5.5V
C1
22µF
PGND
RS1
BM ^1M
FC
PS _RS2
1M
R3
13k
SV_IN
PV_{IN PGOOD}
LTC3411 SW
SYNC/MODE
I_TH
V_FB
SHDN/R_T
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
V_OUT
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
Efficiency vs Load Current
100
Burst Mode
95 ^{OPERATION (BM)}
90
85 ^{PULSE SKIP FORCED}
(PS)
CONTINUOUS (FC)
80
75
70
65
60
1
V_IN = 3.3V
V_OUT = 2.5V
f_O = 1MHz
10
100
1000
LOAD CURRENT (mA)
10000
3411 F07b
16
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