mm908e626 Freescale Semiconductor, Inc, mm908e626 Datasheet - Page 35

• Manufacturer Part Number: mm908e626
• Description: Integrated Stepper Motor Driver With Embedded Mcu And Lin Serial Communication
• Manufacturer: Freescale Semiconductor, Inc

ADDITIONAL DOCUMENTATION
THERMAL ADDENDUM (REV 1.0)
Introduction
technical data sheet. The addendum provides thermal performance information
that may be critical in the design and development of system applications. All
electrical, application and packaging information is provided in the data sheet.
Package and Thermal Considerations
package independently heating with P
temperatures, T
temperature while only heat source 1 is heating with P
reference temperature while heat source 2 is heating with P
R
package to another in a standardized environment. This methodology is not meant to and will not predict the performance of a
package in an application-specific environment. Stated values were obtained by measurement and simulation according to the
standards listed below.
Standards
Table 9. Thermal Performance Comparison
Analog Integrated Circuit Device Data
Freescale Semiconductor
Notes:
θ J21
Resistance
This thermal addendum ia provided as a supplement to the MM908E626
This MM908E626 is a dual die package. There are two heat sources in the
For m, n = 1, R
For m = 1, n = 2, R
The stated values are solely for a thermal performance comparison of one
1.
2.
3.
4.
5.
R
R
R
R
Thermal
θ
θ
θ
θJCmn
JAmn
JBmn
JAmn
and R
Per JEDEC JESD51-2 at natural convection, still air
condition.
2s2p thermal test board per JEDEC JESD51-7and
JESD51-5.
Per JEDEC JESD51-8, with the board temperature on the
center trace near the power outputs.
Single layer thermal test board per JEDEC JESD51-3 and
JESD51-5.
Thermal resistance between the die junction and the
exposed pad, “infinite” heat sink attached to exposed pad.
(5)
(1)(2)
(2)(3)
(1)(4)
θ J22
T
T
J1
, respectively.
J1
J2
θ JA11
and T
m = 1,
1 = Power Chip, 2 = Logic Chip
n = 1
=
9.0
1.0
23
52
θ JA12
is the thermal resistance from Junction 1 to the reference
J2
R
R
θ JA21
, and a thermal resistance matrix with R
θ JA11
is the thermal resistance from Junction 1 to the
m = 1, n = 2
m = 2, n = 1
R
R
θ JA12
θ JA22
6.0
20
47
0
1
and P
.
2
P
P
. This results in two junction
1
2
[°C/W]
m = 2,
n = 2
2.0
24
10
52
1
.
2
. This applies to
θ JA mn
Attachment Per JEDEC JESD51-5Thermal Test Board
Figure 19. Thermal Land Pattern for Direct Thermal
.
10.3 mm x 5.1 mm Exposed Pad
17.9 mm x 7.5 mm Body
54 Terminal SOIC-EP
0.65 mm Pitch
Note For package dimensions, refer to the
908E626 device datasheet.
54-TERMINAL SOICW-EP
THERMAL ADDENDUM (REV 1.0)
ADDITIONAL DOCUMENTATION
54-TERMINAL
98ARL105910
DWB SUFFIX
908E626
SOICW-EP
0.2
* All measurements
are in millimeters
Soldermast
openings
Thermal vias
connected to top
buried plane
1.0
0.2
1.0
908E626
35