LTC3521 LINER [Linear Technology], LTC3521 Datasheet - Page 19

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

packaGe DescripTion
± 0.05
4.50
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGD-X)—TO BE APPROVED
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
ON THE TOP AND BOTTOM OF PACKAGE
± 0.05
3.10
0.70 ±0.05
PACKAGE
OUTLINE
2.45 ± 0.05
(4 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
6.60 ±0.10
(.0035 – .0079)
0.09 – 0.20
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
4.50 ±0.10
0.50 BSC
0.25 ±0.05
RECOMMENDED SOLDER PAD LAYOUT
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
(.169 – .177)
4.30 – 4.50*
(.020 – .030)
0.50 – 0.75
SEE NOTE 4
(.152)
MILLIMETERS
3.86
(INCHES)
0.65 BSC
24-Lead Plastic QFN (4mm × 4mm)
0.45 ±0.05
(Reference LTC DWG # 05-08-1697)
20-Lead Plastic TSSOP (4.4mm)
(Reference LTC DWG # 05-08-1663)
(.108)
0.25
REF
2.74
Exposed Pad Variation CB
1.05 ±0.10
0° – 8°
PIN 1
TOP MARK
(NOTE 6)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
4. RECOMMENDED MINIMUM PCB METAL SIZE
SHALL NOT EXCEED 0.150mm (.006") PER SIDE
FOR EXPOSED PAD ATTACHMENT
UF Package
FE Package
4.00 ± 0.10
(4 SIDES)
(.0256)
0.65
BSC
20 1918 17 16 15
1
(.0077 – .0118)
0.195 – 0.30
2
0.200 REF
0.00 – 0.05
TYP
3 4 5 6 7 8 9 10
(.252 – .260)
0.75 ± 0.05
6.40 – 6.60*
(.152)
3.86
14 13
12
11
FE20 (CB) TSSOP 0204
(.002 – .006)
0.05 – 0.15
R = 0.115
BOTTOM VIEW—EXPOSED PAD
(.108)
(.047)
2.74
MAX
1.20
TYP
(.252)
6.40
BSC
23
24
LTC3521
PIN 1 NOTCH
R = 0.20 TYP OR
0.35 × 45° CHAMFER
0.50 BSC
0.25 ± 0.05
1
2
(UF24) QFN 0105
0.40 ± 0.10
2.45 ± 0.10
(4-SIDES)

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