LTC3411 Datasheet, PDF (17/20 Pages) Linear Technology – 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

TYPICAL APPLICATIO S
LTC3411
Single Inductor, Positive, Buck-Boost Converter
V_IN
2.63V
TO 5V
100k
PGOOD
R1
280k
R3
13k
R2
887k
C7
10pF
C1
22µF
PV_IN
PGND
SV_IN
SW
LTC3411 SGND
PGOOD
V_FB
SYNC/MODE
I_TH
SHDN/R_T
C3
1000pF
L1
3.3µH
D1
M1
V_IN
R4
324k
C2 +
22µF
×2
V_OUT
3.3V/
C4 ^400mA
47µF
C1, C2: TAIYO YUDEN JMK325BJ226MM
C4: SANYO POSCAP 6TPA47M
D1: ON MBRM120L
3411 TA02
L1: TOKO A915AY-3R3M (D53LC SERIES)
M1: SILICONIX Si2302DS
Efficiency vs Load Current
85
f_O = 1MHz
80
75
70
V_IN = 4V
V_IN = 2.5V
V_IN = 3V
V_IN = 3.5V
65
60
55
10
100k
LOAD CURRENT (mA)
1000
3411 TA03
sn3411 3411fs
17