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| LTC3822-1 Datasheet, PDF (21/24 Pages) Linear Technology – No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller | |||
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APPLICATIONS INFORMATION
LTC3822-1
1M
TRACK/SS
IPRG
VIN
SYNC/MODE
RUN
PGOOD
PLLLPF
TG
SENSEâ
SW
13.7k
33pF
LTC3822EGN-1
ITH
BOOST
680pF
GND
BG
VFB
59k
1% 118k 1%
68pF
0.22µF
Si7882DP
Si7882DP
VIN
3.3V
47µF
Ã2
0.56µH**
VOUT
1.8V
100µF* 12A
Ã2
38221 F07
*TAIYO YUDEN JMK325BJ107MM
**TOKO FDU0650
Figure 11. 3.3VIN 1.8V/12A High Efï¬ciency High Current 300kHz Step-Down Converter
Efï¬ciency
95
90
Burst Mode
85 OPERATION
80
PULSE
75 SKIPPING
70
CONTINUOUS
MODE
65
60
55
50
10
100
1000
10000 100000
LOAD CURRENT (mA)
38221 F11b
VOUT
200mV/DIV
AC COUPLED
Load Step
INDUCTOR
CURRENT
5A/DIV
50µs/DIV
38221 F11c
VIN = 3.3V
VOUT = 1.8V
FORCED CONTINUOUS MODE 1A TO 6A
38221f
21
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