Datasheet

LTC3521
2
3521fb
For more information www.linear.com/LTC3521
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absoluTe MaxiMuM raTings
PV
IN1
, PV
IN2
, V
IN
Voltage ............................. –0.3V to 6V
SW1A, SW1B, SW2, SW3 Voltage
DC ............................................................ –0.3V to 6V
Pulsed < 100ns ............................................–1V to 7V
(Note 1)
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3521EFE#PBF LTC3521EFE#TRPBF LTC3521FE 20-Lead Plastic TSSOP –40°C to 125°C
LTC3521IFE#PBF LTC3521IFE#TRPBF LTC3521FE 20-Lead Plastic TSSOP –40°C to 125°C
LTC3521EUF#PBF LTC3521EUF#TRPBF 3521 24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC3521IUF#PBF LTC3521IUF#TRPBF 3521 24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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Voltage, All Other Pins ................................. –0.3V to 6V
Operating Junction Temperature Range
(N
otes 2,
5) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
FB3
FB2
SHDN2
PGOOD3
PGOOD2
PGOOD1
V
IN
GND
PWM
FB1
PV
IN2
SW2
PGND2
SW3
V
OUT1
SW1A
SW1B
PV
IN1
SHDN1
SHDN3
21
PGND1A
T
JMAX
= 150°C, θ
JA
= 40°C/W (NOTE 4)
UNDERSIDE METAL INTERNALLY CONNECTED TO V
–
(PCB CONNECTION OPTIONAL)
EXPOSED PAD (PIN 21) IS PGND1A AND MUST BE SOLDERED TO PCB GROUND
24 23 22 21 20 19
7 8 9
TOP VIEW
25
PGND1A
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
SHDN2
PGOOD3
PGOOD2
PGOOD1
V
IN
GND
PGND2
SW3
V
OUT1
SW1A
SW1B
NC
FB2 FB3 PV
IN2
PGND1A SW2 NC
PWM
FB1
SHDN3 SHDN1
PV
IN1
PGND1B
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS PGND1A AND MUST BE SOLDERED TO PCB GROUND