lt3688fe Linear Technology Corporation, lt3688fe Datasheet - Page 27

• Manufacturer Part Number: lt3688fe
• Description: Lt3688 - Dual 800ma Step-down Switching Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

PACKAGE DESCRIPTION
4.50 ± 0.05
3.10 ± 0.05
2.45 ± 0.05
(4 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
6.60 0.10
4.50 0.10
(.0035 – .0079)
0.09 – 0.20
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
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.
RECOMMENDED SOLDER PAD LAYOUT
0.50 BSC
(.169 – .177)
4.30 – 4.50*
0.25 ±0.05
SEE NOTE 4
(.020 – .030)
0.50 – 0.75
0.70 ±0.05
(.128)
3.25
PACKAGE
OUTLINE
MILLIMETERS
(Reference LTC DWG # 05-08-1771 Rev Ø)
(INCHES)
24-Lead Plastic QFN (4mm × 4mm)
0.65 BSC
24-Lead Plastic TSSOP (4.4mm)
(Reference LTC DWG # 05-08-1697)
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
0.45 0.05
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE, IF PRESENT
ON THE TOP AND BOTTOM OF PACKAGE
(.108)
2.74
0.25
REF
PIN 1
TOP MARK
(NOTE 6)
1.05 0.10
0 – 8
UF Package
FE Package
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
Variation AA
4. RECOMMENDED MINIMUM PCB METAL SIZE
SHALL NOT EXCEED 0.150mm (.006") PER SIDE
4.00 ± 0.10
FOR EXPOSED PAD ATTACHMENT
(4 SIDES)
(.0256)
24
1
0.65
BSC
23
2
22
3 4 5 6 7 8 9 10 11 12
(.0077 – .0118)
0.195 – 0.30
21
TYP
20
(.303 – .311)
7.70 – 7.90*
(.128)
19 18 17 16 15
3.25
0.75 ± 0.05
14 13
0.200 REF
0.00 – 0.05
2.45 ± 0.10
FE24 (AA) TSSOP 0208 REV Ø
(4-SIDES)
(.002 – .006)
0.05 – 0.15
(.108)
(.047)
2.74
MAX
1.20
(.252)
6.40
BSC
R = 0.115
BOTTOM VIEW—EXPOSED PAD
TYP
23
LT3688
24
PIN 1 NOTCH
R = 0.20 TYP OR
0.35 × 45° CHAMFER
0.50 BSC
0.25 ± 0.05
27
1
2
(UF24) QFN 0105
0.40 ± 0.10
3688f