LTC3521 Datasheet, PDF (2/20 Pages) Linear Technology – Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

LTC3521
Absolute Maximum Ratings (Note 1)
PV_IN1, PV_IN2 Voltage..................................... –0.3V to 6V
SW1A, SW1B, SW2, SW3 Voltage
DC............................................................ –0.3V to 6V
Pulsed < 100ns........................................... –1V to 7V
Voltage, All Other Pins.................................. –0.3V to 6V
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
PIN CONFIGURAtion
TOP VIEW
FB3 1
FB2 2
20 PV_IN2
19 SW2
SHDN2 3
18 PGND2
PGOOD3 4
17 SW3
PGOOD2 5
PGOOD1 6
21
16 V_OUT1
GND
15 SW1A
V_IN 7
GND 8
PWM 9
14 SW1B
13 PV_IN1
12 SHDN1
FB1 10
11 SHDN3
FE PACKAGE
20-LEAD PLASTIC TSSOP
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 GND AND MUST BE SOLDERED TO PCB GROUND
TOP VIEW
24 23 22 21 20 19
SHDN2 1
PGOOD3 2
PGOOD2 3
PGOOD1 4
V_IN 5
GND 6
18 PGND2
17 SW3
25
16 V_OUT1
GND
15 SW1A
14 SW1B
13 NC
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 25) IS GND AND MUST BE SOLDERED TO PCB GROUND
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3521EUF#PBF
LTC3521EUF#TRPBF
3521
24-Lead (4mm × 4mm) Plastic QFN
LTC3521EFE#PBF
LTC3521EFE#TRPBF
LTC3521FE
20-Lead Plastic TSSOP
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: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_J = 25°C. V_IN = 3.6V, V_OUT1 = 3.3V, unless otherwise noted.
PARAMETER
Input Voltage
Quiescent Current—Shutdown
Burst Mode Quiescent Current
CONDITIONS
MIN TYP MAX UNITS
l 1.8
5.5
V
V_SHDN1 = V_SHDN2 = V_SHDN3 = 0V
l
V_FB1 = 0.66V, V_FB2 = 0.66V, V_FB3 = 0.66V, V_PWM = 0V
0.01
2
µA
30
µA
3521f