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| LTC3520 Datasheet, PDF (22/24 Pages) Linear Technology – Synchronous 1A Buck-Boost and 600mA Buck Converters | |||
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LTC3520
TYPICAL APPLICATIONS
Dual 3.3V at 500mA and 1.2V at 600mA Supplies
with Power Good Output
VOUT
1.2V
600mA
VIN
2.2V TO 4.2V
Li-Ion
C2
22µF
27pF
C1
22µF
L2
3.3µH
PVIN1 PVIN2 PVIN3 SVIN SW1A
SW1B
SW2
VOUT1
100k
VC1
FB2
0.022µF
191k
SS2
FB1
PWM
BURST
54.9k
RT
PWM1
301k
PWM2
LTC3520
SS1
AIN
AOUT
SD3
ON
OFF
SD2
SD1
PGND1 SGND PGND2
L1
4.7µH
470pF
15k
56pF
1M
10k
0.022µF
309k
BUCK-BOOST
PGOOD OUTPUT
150pF
C3
22µF
VOUT
3.3V
500mA
1A FOR VIN ⥠3V
442k
158k
C1, C2, C3: TAIYO YUDEN CERAMIC JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7µH
L2: TDK RLF7030T-3R3M4R 3.3µH
3520 TA03a
Typical Waveforms During Power-Up
SD1, SD2, SD3
5V/DIV
BUCK-BOOST VOUT
1.5V/DIV
BUCK VOUT
0.5V/DIV
AOUT
(BUCK-BOOST PGOOD)
5V/DIV
1ms/DIV
3520 TA03b
3520f
22
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