LTC4007-1_15 Datasheet, PDF (23/24 Pages) Linear Technology – 4A, High Efficiency, Li-Ion Battery Charger

APPLICATIO S I FOR ATIO
SWITCH NODE
HIGH
V_IN
C2
FREQUENCY
CIRCULATING
PATH
L1
V_BAT
D1
C3
BAT
40071 F12
Figure 12. High Speed Switching Path
LTC4007-1
DIRECTION OF CHARGING CURRENT
R_SENSE
40071 F13
CSP
BAT
Figure 13. Kelvin Sensing of Charging Current
PACKAGE DESCRIPTION
UFD Package
24-Lead Plastic QFN (4mm × 5mm)
(Reference LTC DWG # 05-08-1696)
4.50 ± 0.05
3.10 ± 0.05
2.65 ± 0.05
(2 SIDES)
0.70 ±0.05
5.00 ± 0.10
(2 SIDES)
4.00 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
0.75 ± 0.05
3.65 ± 0.10
(2 SIDES)
2.65 ± 0.10
(2 SIDES)
R = 0.115
TYP
23 24
PIN 1 NOTCH
R = 0.30 TYP
0.40 ± 0.05
1
2
0.25 ±0.05
0.50 BSC
3.65 ± 0.05
(2 SIDES)
4.10 ± 0.05
5.50 ± 0.05
PACKAGE OUTLINE
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING PROPOSED TO BE MADE A JEDEC PACKAGE OUTLINE MO-220 VARIATION (WXXX-X).
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
0.200 REF
0.00 – 0.05
(UFD25) QFN 0504
0.25 ± 0.05
0.50 BSC
BOTTOM VIEW—EXPOSED PAD
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
40071f
23