Datasheet

LTC3522
20
3522fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
LT 0807 REV A • PRINTED IN USA
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PART NUMBER DESCRIPTION COMMENTS
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OUT(RANGE)
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IN
, I
Q
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SD
< 1µA,
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OUT
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IN
: 2.5V to 5.5V, V
OUT(RANGE)
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Q
= 25µA, I
SD
< 1µA,
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OUT
), 2MHz Synchronous Buck-Boost
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IN
: 2.5V to 5.5V, V
OUT(RANGE)
= 2.4V to 5.25V, I
Q
= 25µA, I
SD
< 1µA,
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OUT
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IN
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Q
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SD
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OUT
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IN
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OUT(RANGE)
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Q
= 40µA, I
SD
< 1µA,
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OUT
), 2MHz Synchronous Buck-Boost
DC/DC Converter
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IN
: 2.4V to 5.5V, V
OUT(RANGE)
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Q
= 35µA, I
SD
< 1µA,
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LTC3544/LTC3544B 300mA, 200mA ×2, 100mA, 2.25MHz Quad Output
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3mm × 3mm QFN Packages
TYPICAL APPLICATION
3V at 400mA and 1.8V at 200mA with Sequenced Start-Up
+
PV
IN1
PV
IN2
SW2
FB2
V
OUT1
LTC3522
PGOOD2
1M
137k
12pF
68.1k
C2
4.7μF
C1
6.8μF
C3
4.7μF
Li-Ion
L2
4.7μH
L1
8.2μH
V
OUT1
3V
300mA
(400mA, V
IN
> 3V)
C1: TDK C3216X5R0J685M
C2, C3: TAIYO YUDEN JMK212BJ106MG
L1: COOPER BUSSMANN SD18-8R2
L2: COOPER BUSSMANN SD18-4R7
V
OUT2
1.8V
200mA
PGOOD1
V
IN
2.4V TO 4.2V
499k
499k
3522 TA03A
PGOOD1
PWM
SW1A
SW1B
FB1
SHDN2
SHDN1
PGND1 GND1 PGND2
499k
ON
OFF
PWM
BURST
V
OUT2
1V/DIV
V
OUT1
2V/DIV
PGOOD2
5V/DIV
PGOOD1
5V/DIV
200μs/DIV
3522 TA03b
Sequenced Start-Up Waveforms