Automotive power supply reference design with three outputs using PMIC and LDOs


Design files


This multioutput supply powers a custom ASIC out of 5-V input voltage via multichannel IC (PMIC) LP87653-Q1. Despite this PMIC having four rails, phase three is unused and 1.1 VA (where A equals analog for sensitive loads) is generated via low-dropout regulator (LDO) on customer demand. The LDO used for 2.5 VA and 1.1 VA is TPS745-Q1. Both LDOs are powered out of 3.3 V to lower the losses of the LDO 1.1 VA, and two power resistors are added to the input.

  • Automotive power supply to energize a custom ASIC out of 5-V input
  • I/O to enable LMK00804 level translator, for example
  • Individual sequencing is 3.3 V, 2.5 V then 1.1 V (buck and LDO) and start-up of the 1.1-V outputs are delayed by 11 ms
  • Dual-stage differential input filter to attenuate switching frequency and harmonics as well as RF noise
  • I2C bus for control and monitoring on the fly
Output voltage options PMP30819.1 PMP30819.2 PMP30819.3
Vin (Min) (V) 5 5 5
Vin (Max) (V) 5 5 5
Vout (Nom) (V) 1.1 2.5 1.1
Iout (Max) (A) 6 .3 .4
Output Power (W) 6.6 .75 .44
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC
Topology Buck- Integrated Switch^Buck- Synchronous Linear Regulator Linear Regulator
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDT289.PDF (2987 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components

TIDCG83.ZIP (148 K)

Design file that contains information on physical board layer of design PCB

TIDMAM4.PDF (1006 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Multi-channel ICs (PMICs)

LP87563-Q1Automotive multiphase 8A + 4A + 4A buck converter with integrated switche

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS745-Q1Automotive 500-mA, low-IQ, high-PSRR, low-dropout (LDO) voltage regulator with power good

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report Automotive Power Supply Reference Design With Three Outputs Using PMIC and LDOs PDF | HTML Jul. 13, 2022

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