ltc3891 Linear Technology Corporation, ltc3891 Datasheet - Page 30

• Manufacturer Part Number: ltc3891
• Description: Ltc3891 - Low Iq, 60v Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3891
PACKAGE DESCRIPTION
30
3.50 ± 0.05
2.10 ± 0.05
1.50 REF
4.00 ± 0.10
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
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
TOP MARK
(NOTE 6)
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
ON THE TOP AND BOTTOM OF PACKAGE
1.65 ± 0.05
0.50 BSC
PIN 1
0.25 ±0.05
3.10 ± 0.05
4.50 ± 0.05
3.00 ± 0.10
2.50 REF
2.65 ± 0.05
(Reference LTC DWG # 05-08-1742 Rev Ø)
20-Lead Plastic QFN (3mm × 4mm)
(Reference LTC DWG # 05-08-1742 Rev Ø)
20-Lead Plastic QFN (3mm × 4mm)
UDC Package
UDC Package
0.70 ±0.05
0.75 ± 0.05
PACKAGE OUTLINE
0.200 REF
0.00 – 0.05
R = 0.05 TYP
2.50 REF
R = 0.115
TYP
BOTTOM VIEW—EXPOSED PAD
2.65 ± 0.10
1.65 ± 0.10
1.50 REF
19
20
0.50 BSC
0.25 ± 0.05
1
2
0.40 ± 0.10
(UDC20) QFN 1106 REV Ø
PIN 1 NOTCH
R = 0.20 OR 0.25
× 45° CHAMFER
3891f