LTC3521IFE-TRPBF データシートの表示（PDF） - Linear Technology
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LTC3521IFE-TRPBF Datasheet PDF : 22 Pages
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LTC3521
Typical Application
Li-Ion to 3.3V at 800mA, 1.8V at 600mA and 1.2V at
600mA with Sequenced Start-Up
VIN
2.4V TO
4.2V
+
Li-Ion
4.7µF L1
4.7µH
VOUT3
1.2V
600mA
499k
L3
4.7µH
C3
R5
10µF 100k
R6
100k
PVIN1 VIN PVIN2
SW1A
SW2
SW1B
FB2
SW3
LTC3521
FB3
VOUT1
PGOOD1
PWM
BURST
FB1
PGOOD3
SHDN1
SHDN2
PGOOD1 PGOOD2
PWM
SHDN3
PGND1A
PGND1B GND PGND2
L2
4.7µH
R3
137k
VOUT2
1.8V
C2 600mA
10µF
R4
68.1k
R1
1.0M
VOUT1
3.3V
800mA
C1
22µF
(1A,
VIN
>
3.0V)
R2
221k
R5
499k
ON
OFF
3521 TA03a
Sequenced Start-Up Waveforms
VOUT2
2V/DIV
VOUT3
2V/DIV
VOUT1
2V/DIV
SHDN2, 5V/DIV
PGOOD2, 5V/DIV
PGOOD3, 5V/DIV
500µs/DIV
3521 TA03b
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Dual 300mA IOUT, 2.25MHz, Synchronous Step-Down DC/ 95% Efficiency, VIN: 2.5V to 5.5V, VOUT(MIN) = 0.6V, IQ = 40µA,
DC Converter
ISD < 1µA, DFN-8 Package
22 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950Fo3r5m-7o4re1i7nformation www.linear.com/LTC3521
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC3521
3521fb
LT 0813 REV B • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2010
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