Automotive eCall Power Supply Reference Design with Low Intermediate Voltage
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This reference design includes a complete power management solution for a standalone emergency call (eCall) system in an automotive environment. The circuit is supplied directly from the car battery rail. It also manages a backup battery to power the eCall system while the car battery rail is not available. It includes power path management which routes the available power rail directly to four DC/DC converters which are supplying the required functional blocks of the eCall system. The solution is optimized to operate at maximum efficiency while powered from the backup battery.



  • Complete power solution for an automotive eCall system
  • Operating input voltage range up to 40V
  • Provides supply voltage for all required eCall functional blocks
  • Up to 87% total efficiency while operating at backup power
  • Up to 90% total efficiency in standby at backup power
  • All DC/DC converters used can operate at switching frequencies above 2MHz


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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)5555
Vin (Max) (V)40404040
Vout (Nom) (V)3.81.859
Iout (Max) (A)2111
Output Power (W)7.61.859
TopologyBuck Boost- Integrated SwitchBuck- Integrated SwitchBuck Boost- Integrated SwitchBoost- Integrated Switch

TI Devices (10)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ25071  1A, Single-Input, Single-Cell LiFePO4 Linear Battery Charger with 50mA LDO  Battery management  Sample & Buy Not Available
BQ28Z610  Battery fuel gauge with integrated protector for 1-2 series packs  Battery management  Sample & Buy View Design Kits & Evaluation Modules
CSD16412Q5A  25V, N ch NexFET MOSFET™, single SON5x6, 16mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
CSD25402Q3A  -20V, P ch NexFET MOSFET™, single SON 3x3, 8.9mOhm  MOSFETs  Sample & Buy Not Available
LM43603-Q1  Automotive Qualified 3.5V to 36V, 3A Synchronous Step-Down Voltage Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TAS5421-Q1  22-W Analog Input Mono Channel Automotive Class-D Audio Amplifier With Load Dump and I2C Diagnostics  Audio amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TL331-Q1  Automotive Catalog Single Differential Comparator  Amplifiers  Sample & Buy Not Available
TPS61175-Q1  3-A High-Voltage Automotive Boost Converter with Programmable Switching Frequency  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62290-Q1  Automotive 2.3V to 6V, 2.25MHz Fixed Frequency 1A Buck Converter in 2x2mm SON/TSOT23 Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS63020-Q1  High Efficiency Automotive Single Inductor Buck-Boost Converter with 4A Switch  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ25071 Download Download
BQ28Z610 Download Download
CSD16412Q5A VSONP (DQJ)| 8 Download Download
CSD25402Q3A VSONP (DNH)| 8 Download
LM43603-Q1 Download Download
TAS5421-Q1 Download
TL331-Q1 Download Download
TPS61175-Q1 Download
TPS62290-Q1 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 176 13 Jan 2016
Design files (4)
Title Type Size (KB) Date
ZIP 275 13 Jan 2016
PDF 1151 13 Jan 2016
PDF 89 13 Jan 2016
PDF 88 13 Jan 2016

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