LTC3520 Linear Technology, LTC3520 Datasheet - Page 22

• Manufacturer Part Number: LTC3520
• Description: Synchronous 1A Buck-Boost and 600mA Buck Converters
• Manufacturer: Linear Technology

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LTC3520
TYPICAL APPLICATIONS
22
600mA
V
1.2V
OUT
C1, C2, C3: TAIYO YUDEN CERAMIC JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7µH
L2: TDK RLF7030T-3R3M4R 3.3µH
Li-Ion
C2
22µF
BURST
V
2.2V TO 4.2V
IN
27pF
OFF
PWM
ON
(BUCK-BOOST PGOOD)
100k
191k
C1
22µF
BUCK-BOOST V
3.3µH
SD1, SD2, SD3
0.022µF
L2
54.9k
301k
Dual 3.3V at 500mA and 1.2V at 600mA Supplies
BUCK V
1.5V/DIV
0.5V/DIV
5V/DIV
5V/DIV
A
SW2
FB2
SS2
R
PWM1
PWM2
SD3
SD2
SD1
PV
OUT
OUT
OUT
T
Typical Waveforms During Power-Up
IN1
PGND1
PV
IN2
with Power Good Output
LTC3520
SGND
PV
IN3
SV
PGND2
1ms/DIV
IN
SW1A
SW1B
V
A
OUT1
SS1
V
FB1
OUT
A
C1
IN
470pF
0.022µF
4.7µH
L1
150pF
15k
3520 TA03b
PGOOD OUTPUT
BUCK-BOOST
10k
56pF
1M
309k
C3
22µF
442k
158k
V
3.3V
500mA
1A FOR V
3520 TA03a
OUT
IN
≥ 3V
3520f