The document describes a smart battery switch demonstrator that uses electronic components rather than a traditional pyroelectric switch. It can handle currents up to 400 amps static and 1800 amps for starting. The demonstrator uses new TO-Leadless MOSFETs combined with a copper inlay PCB technology to achieve low resistances of 0.082mOhm and 0.112mOhm from the MOSFET and terminal to terminal respectively. Measurement results show voltage drops and temperature rises up to different current levels. The technology allows for more flexible control compared to traditional switches and can provide benefits like reduced corrosion.

1. Smart Battery Switch
Demonstrator (SBS)
September 2014

2. Smart Battery Switch Demonstrator
Power Distribution System Innovation
Battery
Vbat
IBS
notprotected
M
B4/B6
e.g. EPS,
engine fan
S G
IS
Control
SD
SBS1
IS
Control
SD
SBS3
Pre-fuse box
KL30g2
IS
Control
SD
SBS2 high current load disconnect
IS
Control
SD
SBS4
Pre-fuse box
KL30g1
generator/starter
cable protection
loads
ECU
M
Independent power networks
Delay / timing functionality
Peak current management
Partial powernet activation
Independent failure management
Quiescent current management
High current load disconnect
Avoid corrosion / electro-migration
Failure / safety disconnect
Optional high-current electronic fuse
Replacement of pyro-electrc switch
Resettable high current cable shutdown
Avoid corrosion / electro-migration
Jumpstart reverse battery blocking
Optional smart starter control function
SBS: Smart Battery Switch
Page 22013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

3. Smart Battery Switch Demonstrator
Technical Realization
Pyro-electric
Battery Disconnect (SBK)
Picture from Auto Kabel
Electronic Smart Battery Switch (SBS)
A joint high current system demonstrator project of
Infineon Technologies and Schweizer Electronic
Electronic replacement of the
Pyro-electric SBK
Same current handling
Similar size
Switch at any time
Page 32013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

4. Smart Battery Switch Demonstrator
Technical Realization
A joint high current system demonstrator project of
Infineon Technologies and Schweizer Electronic
Page 42013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

5. Smart Battery Switch Demonstrator
TO-Leadless MOSFET & PCB Inlay Technology
bond wires
2mm Cu-Inlay
thermal-vias planar backside for optional cooling
chip
High current system approach, combining
High current MOSFET technology
High current PCB Inlay technology
Page 52013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

6. Smart Battery Switch Demonstrator
Main Features
 Description
Electronic high current battery disconnect, built up with the new ultra lowohmic TO-Leadless
MOSFETs in combination with an innovative Inlay PCB technology
 Key features
 400A static current
 1800A starter current (thermal limited)
 4500A short circuit shutdown
 7200A peak current (40µs at 125°C)
 0.082mΩ typ MOSFET resistor (25°C)
 0.112mΩ typ Terminal-Terminal resistor
 4.7K/W thermal resistor
 36K temperature rise at 250A DC
 Main Applications
 Replacement of pyro-electric battery
disconnect switches (SBK)
 Resettable failure current shutdown
(electro-migration, corrosion)
 Safety switch for high current loads (EPS,
engine fan, chassis control, …)
 Quiescent current optimization (parking,
transport, seasonal use, …)
 Partial power networks (electric vehicle
charging, living/working in the car, …)
 Customer Benefits
 Very compact design, ready to use
 Lowest terminal-terminal resistor due to
newest technologies (MOSFET and PCB)
 Minimum passive cooling via terminal/cable
 Low cost approach
Page 62013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

7. Smart Battery Switch Demonstrator
Measurement Results
 Description
Measurement results at the Smart Battery Switch, sitting directly on the battery terminal,
50mm² cable at the output, free air convection, ambient temperature is 26°C and the
measurements are done after a thermal settling time of ~30min.
MOSFETs Terminal-to-
Terminal
Current
[A]
Voltage
drop
[mV)
Resistor
[µOhm]
Power
loss
[W]
delta_T
static
junction-
ambient
[K]
Voltage
drop
[mV]
Resistor
[µOhm]
Power
loss
[W]
50 4.1 82 0.2 3.7 5.6 112 0.3
100 8.2 82 0.8 7.4 11.2 112 1.2
250 22.9 92 5.7 36 31.1 124 7.8
400 43.4 108 17.4 80 57.7 144 23.1
Page 72013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

8. Smart Battery Switch Demonstrator
Thermal Inspection
250A 10min 400A 2.5min
Page 82013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

9. TO-Leadless Package H_PSOF
Package Topology and Solder Joint Control
Exposed Cu =
no guaranteed wetting
Trapezoid groove = guaranteed wetting
Sn plated but no guaranteed wetting due
to mold flashes
Exposed Cu =
no guaranteed wetting
Sn plated but no guaranteed wetting due
to mold flashes
0,55 mm
0,1+0,05/-0
0,8 mm
Sn plated = guaranteed wetting
Page 92013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.

10. Page 10Copyright © Infineon Technologies 2013. All rights reserved.
TOLL - Infineon’s latest PowerMOS Package
40V TOLL Product Portfolio
Product Name
max RDSon
[mOhm]
ID
[A]
LL/NL
RthJC
[K/W]
Status
IPLU300N04S4-R8 0.77 300 NL 0.35 Released
IPLU300N04S4-1R1 1.1 300 NL 0.8 QS-available
IPLU250N04S4-1R7 1.7 250 NL 0.5 QS-available
2013-10-30

11. Smart Battery Switch Demonstrator
PCB Copper Inlay Technology
High Current PCB Copper Inlay Technology
Multilayer PCB combined with thick Cu Inlays
Highest current capability and low resistance
Excellent thermal resistance and heat spreading
High mechanical stability
Automotive qualified
2mm Cu-Inlay
thermal-vias
2mm Cu-Inlays
Page 112013-10-30 Copyright © Infineon Technologies AG 2013. All rights reserved.