ltc3521fe Linear Technology Corporation, ltc3521fe Datasheet - Page 2

• Manufacturer Part Number: ltc3521fe
• Description: Ltc3521 Wide Vin, 1a Buck-boost Dc/dc And Dual 600ma Buck Dc/dc Converters Features
• Manufacturer: Linear Technology Corporation

absoluTe MaxiMuM raTinGs
elecTrical characTerisTics
LTC3521
PV
SW1A, SW1B, SW2, SW3 Voltage
Voltage, All Other Pins ................................. –0.3V to 6V
orDer inForMaTion
junction temperature range, otherwise specifications are at T
PARAMETER
Input Voltage
Quiescent Current—Shutdown
Burst Mode Quiescent Current
pin conFiGuraTion
LEAD FREE FINISH
LTC3521EUF#PBF
LTC3521EFE#PBF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
For more information on tape and reel specifications, go to:

IN1
DC ............................................................ –0.3V to 6V
Pulsed < 100ns ........................................... –1V to 7V
UNDERSIDE METAL INTERNALLY CONNECTED TO V
, PV
EXPOSED PAD (PIN 21) IS GND AND MUST BE SOLDERED TO PCB GROUND
IN2
Voltage .................................... –0.3V to 6V
PGOOD3
PGOOD2
PGOOD1
SHDN2
T
PWM
JMAX
GND
FB3
FB2
FB1
V
IN
= 150°C, θ
20-LEAD PLASTIC TSSOP
TAPE AND REEL
LTC3521EUF#TRPBF
LTC3521EFE#TRPBF
10
1
2
3
4
5
6
7
8
9
FE PACKAGE
TOP VIEW
JA
GND
21
= 40°C/W (NOTE 4)
–
20
19
18
17
16
15
14
13
12
11
(PCB CONNECTION OPTIONAL)
PV
SW2
PGND2
SW3
V
SW1A
SW1B
PV
SHDN1
SHDN3
CONDITIONS
V
V
OUT1
SHDN1
FB1
IN2
IN1
http://www.linear.com/leadfree/
= 0.66V, V
PART MARKING
3521
LTC3521FE
http://www.linear.com/tapeandreel/
= V
SHDN2
FB2
The
= V
J
= 0.66V, V
= 25°C. V
(Note 1)
l
SHDN3
denotes the specifications which apply over the full operating
= 0V
Operating Junction Temperature Range
(Note 2) .................................................... –40°C to 85°C
Maximum Junction Temperature (Note 5)............. 125°C
Storage Temperature Range ................... –65°C to 150°C
FB3
IN
= 0.66V, V
= 3.6V, V
EXPOSED PAD (PIN 25) IS GND AND MUST BE SOLDERED TO PCB GROUND
PACKAGE DESCRIPTION
24-Lead (4mm × 4mm) Plastic QFN
20-Lead Plastic TSSOP
PGOOD3
PGOOD2
PGOOD1
PWM
SHDN2
OUT1
GND
V
= 0V
IN
24-LEAD (4mm 4mm) PLASTIC QFN
= 3.3V, unless otherwise noted.
1
2
3
4
5
6
T
JMAX
24 23 22 21 20 19
7
l
l
= 125°C, θ
8
UF PACKAGE
TOP VIEW
9
GND
25
MIN
1.8
10 11 12
JA
= 37°C/W
0.01
TYP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
30
18
17
16
15
14
13
PGND2
SW3
V
SW1A
SW1B
NC
OUT1
MAX
5.5
2
UNITS
3521f
µA
µA
V