MX868R IXYS, MX868R Datasheet - Page 7

• Manufacturer Part Number: MX868R
• Description: IC FLUX SENSOR 12BIT DGTL 8-DFN
• Manufacturer: IXYS
• Type: Special Purposer

Specifications of MX868R

• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 3mA
• Output Type: Digital, 12-Bit Serial
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-VFDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensing Range: -
• Current - Output (max): -
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MX868
Application Example
This application example illustrates one method of incorporating the MX868 into a power circuit board
design. The double-sided 8oz copper traces carry 50A (25 A on the top trace and 25A on the bottom
trace) around the center section of the planar E-core. The MX868 is mounted on a small single layer flex
circuit that effectively adds a third layer. The flex also fans out the fine pitch DFN package to a pitch
compatible with the power board. The magnetic circuit consists of two ferrite E14 planar cores. The
center post of one of the cores is gapped to accommodate the MX868 package thickness plus the flex
circuit thickness. For the 50A full scale application a gap of 47 to 52 mils is appropriate (1.2 to 1.32 mm).
The gain trim range of the MX868 can accommodate even larger gaps if required.
This following example illustrates the MX868 mounted directly on a 1oz PCB with a copper strap
positioned around the Hall element to carry the current being measured.
Design alternatives:
The use of an E-I core pair results in a lower profile than E-E however a thinner board must be used. A
thinner sensor can be obtained by FCOF (flip chip on flex) packaging of the MX868 bumped die. The
maximum mounting height of the DFN package is 1.1 mm whereas the chip height is about 0.4 mm.
MX868
Drawing No. 086809
PCB top layer: (scale 1X)
Flex circuit
Cross Section (drawing not to scale)
PCB bottom layer: (top view, 1X)
Copper stamping, thickness as required
MX868
MX868
7
(2) E14 planar cores
Flex circuit: (component side, 1X)
IXYS
www.claremicronix.com
03/03/08