LTC3521 LINER [Linear Technology], LTC3521 Datasheet - Page 20

• Manufacturer Part Number: LTC3521
• Description: Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters
• Manufacturer: LINER [Linear Technology]

Typical applicaTion
relaTeD parTs
LTC3521
0
2.4V TO
PART NUMBER
LTC3100
LTC3101
LTC3409
LTC3441/LTC3442/
LTC3443
LTC3520
LTC3522
LTC3531/LTC3531-3/
LTC3531-3.3
LTC3532
LTC3547
600mA
V
4.2V
OUT3
1.2V
V
IN
+
499k
Li-Ion
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
Li-Ion to 3.3V at 800mA, 1.8V at 600mA and 1.2V at
PGOOD1
C3
10µF
BURST
4.7µF
DESCRIPTION
700mA I
Synchronous Step-Down DC/DC Converter and 100mA LDO
Wide V
Controller, 800mA Buck-Boost, Dual 350mA Buck
Converters, 50mA Always-On LDO
600mA I
DC/DC Converter
1.2A I
Converter
1A 2MHz, Synchronous Buck-Boost and 600mA Buck
Converter
400mA 2MHz, Synchronous Buck-Boost and 200mA Buck
Converter
200mA I
Converter
500mA I
Converter
Dual 300mA I
DC/DC Converter
R6
100k
R5
100k
600mA with Sequenced Start-Up
4.7µH
4.7µH
PWM
●
L1
L3
OUT
FAX: [phone]
IN
SW
OUT
OUT
OUT
, Multioutput DC/DC Converter and PowerPath™
, 2MHz, Synchronous Buck-Boost DC/DC
, 1.5MHz, Synchronous Step-Up, 250mA
, 1.7MHz/2.6MHz, Synchronous Step-Down
, 1.5MHz, Synchronous Buck-Boost DC/DC
, 2MHz, Synchronous Buck-Boost DC/DC
SW1A
SW1B
SW3
FB3
PGOOD3
SHDN1
PGOOD1
PWM
PGND1
OUT
PV
, 2.25MHz, Synchronous Step-Down
IN1
LTC3521
GND
PV
PGOOD2
SHDN2
SHDN3
PGND2
IN2
V
●
SW2
OUT1
FB2
FB1
www.linear.com
3521 TA03a
4.7µH
499k
R5
L2
68.1k
1.0M
137k
R3
R4
R1
OFF
R2
221k
ON
C2
10µF
C1
22µF
V
1.8V
600mA
V
3.3V
800mA
(1A, V
OUT2
OUT1
COMMENTS
94% Efficiency, V
I
95% Efficiency, V
4mm × 4mm QFN-24 Package
96% Efficiency, V
I
95% Efficiency, V
I
95% Efficiency, V
I
95% Efficiency, V
I
95% Efficiency, V
I
95% Efficiency, V
I
95% Efficiency, V
I
SD
SD
Q
SD
SD
SD
Q
SD
IN
= 50µA, I
= 35µA, I
< 1µA, 3mm × 3mm QFN-16 Package
< 1µA, DFN Package
< 1µA, 4mm × 4mm QFN-24 Package
< 1µA, 3mm × 3mm QFN-16 Package
< 1µA, ThinSOT and DFN Packages
< 1µA, DFN-8 Package
> 3.0V)
SD
SD
< 1µA, DFN Package
< 1µA, MS10 and DFN Packages
PGOOD2, 5V/DIV
PGOOD3, 5V/DIV
SHDN2, 5V/DIV
IN
IN
IN
IN
IN
IN
IN
IN
IN
: 0.7V to 5V, V
: 1.8V to 5.5V, I
: 1.6V to 5.5V, V
: 2.4V to 5.5V, V
: 2.2V to 5.5V, V
: 2.4V to 5.5V, V
: 1.8V to 5.5V, V
: 2.4V to 5.5V, V
: 2.5V to 5.5V, V
2V/DIV
2V/DIV
2V/DIV
V
V
V
OUT2
OUT3
OUT1
Sequenced Start-Up Waveforms
 LINEAR TECHNOLOGY CORPORATION 2010
OUT(MAX)
Q
OUT(MIN)
OUT(MIN)
OUT(MAX)
OUT(MAX)
OUT(MIN)
OUT(MIN)
OUT(MIN)
= 38µA, Standby I
= 5.25V, I
: 2.4V to 5.25V,
: 2V to 5V, I
: 2.4V to 5.25V,
= 0.6V, I
= 0.6V, I
= 5.25V, I
= 5.25V, I
500µs/DIV
LT 0310 • PRINTED IN USA
Q
Q
Q
= 15µA,
Q
Q
= 65µA,
= 40µA,
Q
Q
= 55µA,
= 25µA,
= 15µA,
= 16µA,
3521 TA03b
3521f