Inverting buck-boost reference design


Design files


This reference design uses UCD3138064A as a digital controller to control two-phase two-rail inverting buck-boost. This non-isolated converter is used for wireless radio power. The input voltage is from -35 V to -60 V. There are two outputs. The default output voltage of rail 1 is 32 V and max current is 8.5 A; the default output voltage of rail 2 is 48 V and max current is 5.5 A. The output voltage is adjustable from 30 V to 56 V. With some component changes and firmware changes, the hardware can be used for current mode control or transition mode control to increase power and improve load transient. Test results of three controls are provided respectively.

  • Inverting buck boost for -48-V to 48-V system
  • Transient response with less than +/- 3% overshoot/undershoot voltage
Output voltage options PMP20587.1
Vin (Min) (V) -62
Vin (Max) (V) -36
Vout (Nom) (V) 48
Iout (Max) (A) 12.5
Output Power (W) 600
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- Inverting
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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.

TIDT191.PDF (7558 K)

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

TIDM645.PDF (728 K)

Detailed schematic diagram for design layout and components

TIDM646.PDF (320 K)

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

TIDM647.PDF (628 K)

Detailed overview of design layout for component placement

TIDM649.ZIP (2284 K)

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

TIDCFW2.ZIP (2969 K)

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

TIDM648.PDF (3921 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

LP2985-N150-mA, 16-V, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Analog temperature sensors

LM60±2°C analog output temperature sensor with 6.25mV /°C gain and TO-92 option

Data sheet: PDF | HTML

LMV393-NDual General Purpose, Low Voltage, Tiny Pack Comparator

Data sheet: PDF | HTML
Digital power isolated controllers

UCD3138064AHighly Integrated Digital Controller for Isolated Power

Data sheet: PDF | HTML
General-purpose op amps

OPA344Single, 5.5-V, 1-MHz, 1-mV offset, RRIO operational amplifier

Data sheet: PDF
High-speed op amps (GBW ≥ 50 MHz)

OPA3652.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM5161Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter

Data sheet: PDF | HTML
Isolated gate drivers

UCC21225A2.5kVrms, 4A/6A dual-channel isolated gate driver with dual input, 5V UVLO & LGA package

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report Inverting Buck Boost Reference Design Jul. 21, 2020

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