LTC3520 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC3520' PDF : 24 Pages View PDF
LTC3520
TYPICAL APPLICATIONS
VOUT
1.8V
600mA
Sequenced Buck Converter Start-Up
3.3V at 500mA and 1.8V at 600mA Outputs
VIN
2.2V TO 4.2V
Li-Ion
C1
22μF
L2
3.3μH
PVIN1 PVIN2 PVIN3
SW2
SVIN SW1A
SW1B
VOUT1
L1
4.7μH
470pF
255k
C2
22μF
200k
27pF
FB2
0.022μF
SS2
VC1
15k
FB1
0.022μF
BURST PWM
54.9k
RT
PWM1
301k
PWM2
LTC3520
SS1
AIN
AOUT
SD3
OFF ON
SD1
SD2
PGND1 SGND PGND2
56pF
1M
10k
309k
C3
22μF
VOUT
3.3V
500mA
1A FOR VIN ≥ 3V
442k
158k
470pF
499k
C1, C2, C3: TAIYO YUDEN CERAMIC JMK212BJ226MG-T
L1: TDK RLF7030T-4R7M3R4 4.7μH
L2: TDK RLF7030T-3R3M4R 3.3μH
THE BUCK CONVERTER IS ENABLED WHEN THE
BUCK-BOOST OUTPUT VOLTAGE REACHES 3.0V.
3520 TA02a
Typical Waveforms During Power-Up
SD1, SD3
5V/DIV
BUCK-BOOST
VOUT
2V/DIV
AOUT
5V/DIV
BUCK VOUT
1V/DIV
1ms/DIV
3520 TA02b
3520fa
21
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