Datasheet

LTC3822-1
22
38221f
APPLICATIONS INFORMATION
22µF
×2
V
IN
3.3V
V
OUT
1.1V
8A
38221 F12a
64.9k
470pF
IPRG V
IN
PLLLPF
SW
BOOST
TG
RUN
SYNC/MODE
I
TH
V
FB
BGGND
*SANYO 2R5TPE220M9
**TOKO FDV0630
LTC3822EDD-1
TRACK/SS
EXTERNAL
OSCILLATOR
700kHz
59k
1%
0.20µF
0.20µH**
10µF
X5R
Si7940DP
Si7940DP
220µF*
10nF
33pF
10k
49.9k 1%
82pF
Figure 12. Externally Synchronized 700kHz, 3.3V
IN
, 1.1V/8A Step-Down Converter
LOAD CURRENT (mA)
10
40
EFFICIENCY (%)
50
60
70
80
100 1000 10000
38221 F12b
30
20
10
0
90
V
OUT
50mV/DIV
AC COUPLED
INDUCTOR
CURRENT
2A/DIV
V
IN
= 3.3V
V
OUT
= 1.1V
LOAD STEP 300mA TO 3.3A
50µs/DIV
38221 F12c
Effi ciency Load Step