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LTC3520 데이터시트(PDF) 21 Page - Linear Technology

부품명 LTC3520
상세설명  Synchronous 1A Buck-Boost and 600mA Buck Converters
PDF  24 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3520 데이터시트(HTML) 21 Page - Linear Technology

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LTC3520
21
3520f
TYPICAL APPLICATIONS
Sequenced Buck Converter Start-Up
3.3V at 500mA and 1.8V at 600mA Outputs
3520 TA02a
SW1A
SW1B
VOUT1
AOUT
AIN
VC1
FB1
SS1
SVIN
PVIN3
PVIN2
PVIN1
PGND2
SGND
PGND1
SW2
FB2
SS2
RT
PWM1
PWM2
SD3
SD1
SD2
C3
22
µF
1M
442k
309k
15k
470pF
10k
56pF
LTC3520
VOUT
3.3V
500mA
1A FOR VIN ≥ 3V
VOUT
1.8V
600mA
VIN
2.2V TO 4.2V
C1, C2, C3: TAIYO YUDEN CERAMIC JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7
µH
L2: TDK RLF7030T-3R3M4R 3.3
µH
THE BUCK CONVERTER IS ENABLED WHEN THE
BUCK-BOOST OUTPUT VOLTAGE REACHES 3.0V.
C2
22
µF
470pF
0.022
µF
0.022
µF
54.9k
255k
200k
301k
499k
C1
22
µF
Li-Ion
L2
3.3
µH
L1
4.7
µH
PWM
BURST
ON
OFF
158k
27pF
Typical Waveforms During Power-Up
SD1, SD3
5V/DIV
1ms/DIV
BUCK VOUT
1V/DIV
BUCK-BOOST
VOUT
2V/DIV
AOUT
5V/DIV
3520 TA02b



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