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| LTC3822-1_15 Datasheet, PDF (22/24 Pages) Linear Technology – No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller | |||
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LTC3822-1
APPLICATIONS INFORMATION
EXTERNAL
OSCILLATOR
700kHz
10nF
10k
33pF
64.9k
470pF
TRACK/SS
IPRG
VIN
SYNC/MODE
RUN
PLLLPF
TG
LTC3822EDD-1
SW
ITH
BOOST
GND
BG
VFB
59k
1% 49.9k 1%
82pF
0.20µF
Si7940DP
0.20µH**
Si7940DP
VIN
22µF 3.3V
Ã2
10µF
X5R
VOUT
1.1V
220µF* 8A
38221 F12a
*SANYO 2R5TPE220M9
**TOKO FDV0630
Figure 12. Externally Synchronized 700kHz, 3.3VIN, 1.1V/8A Step-Down Converter
90
80
70
60
50
40
30
20
10
0
10
Efï¬ciency
100
1000
LOAD CURRENT (mA)
10000
38221 F12b
Load Step
VOUT
50mV/DIV
AC COUPLED
INDUCTOR
CURRENT
2A/DIV
50µs/DIV
VIN = 3.3V
VOUT = 1.1V
LOAD STEP 300mA TO 3.3A
38221 F12c
38221f
22
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