LTC4255 Datasheet, PDF (15/16 Pages) Linear Technology – Quad Network Power Controller with I2C Compatible Interface

LTC4255
APPLICATIO S I FOR ATIO
Relay Drivers
The four relay drivers have an open collector NPN
transistor with the ability to sink 50mA to within 0.3V of
DGND (Figure 13).
An 18V Zener diode connected to DGND is provided to
protect against the inductive kickback of the coil when the
NPN transistor is turned off.
3V TO 12V
DRIVE
CIRCUITRY
RELAY
18V
DGND
4255 F13
Figure 13. Relay Driver Output
PACKAGE DESCRIPTIO
7.8 – 8.2
G Package
28-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
1.25 ±0.12
9.90 – 10.50*
(.390 – .413)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
5.3 – 5.7
7.40 – 8.20
(.291 – .323)
0.42 ±0.03
RECOMMENDED SOLDER PAD LAYOUT
5.00 – 5.60**
(.197 – .221)
0.65 BSC
1 2 3 4 5 6 7 8 9 10 11 12 13 14
2.0
(.079)
0° – 8°
0.09 – 0.25
(.0035 – .010)
0.55 – 0.95
(.022 – .037)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2.
DIMENSIONS
ARE
IN
MILLIMETERS
(INCHES)
3. DRAWING NOT TO SCALE
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED .152mm (.006") PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
0.65
(.0256)
BSC
0.22 – 0.38
(.009 – .015)
0.05
(.002)
G28 SSOP 0802
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.
4255f
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