Supercapacitor backup power supply for E-Meters reference design

(ACTIVE) PMP30528

Description & Features

Technical Documents

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Key Document

Description

This reference design automatically provides back-up voltages to an E-Meter during a power interruption. While the input voltage is between 10 V to 12 V, two buck controllers (TPS62147, TPS62173) generate 3.9 V at 2 A and 5 V at 150 mA. An optional synchronous boost generates 3.3 V at 50 mA. A discrete charge circuit charges a supercapacitor with a constant current up to an adjustable voltage of 2.7 V. When the input voltage fails, a synchronous boost takes over and boosts the supercap voltage to 3.9 V. The supercap capacitance and voltage defines the energy, which is available for the backup. The design enables a stable backup output of 3.9 V at 200 mA for about 70 s until the output voltage drops.

Features
  • Seamless transition between mains power and back-up operation
  • Designed to support high output power RF communications such as LTE, NB-IOT, or wireless MBUS or 6LoWPAN
  • Single supercapacitor design to minimize system cost
  • Discrete constant current supercapacitor charger
  • Complete tested design with available design files and test report

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP30528.1
(Output Voltage 1)
PMP30528.2
(Output Voltage 2)
PMP30528.3
(Output Voltage 3)
PMP30528.4
(Output Voltage 4)
Vin (Min) (V)10101010
Vin (Max) (V)12121212
Vout (Nom) (V)53.33.93.9
Iout (Max) (A).15.0522
Output Power (W).75.1657.87.8
Isolated/Non-IsolatedNon-IsolatedNon-IsolatedNon-IsolatedNon-Isolated
Input TypeDCDCDCDC
TopologyBuck- SynchronousBuck- SynchronousBuck- SynchronousBuck- Synchronous

TI Devices (7)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD15571Q2  20-V N-Channel NexFET™ Power MOSFET  MOSFETs  Sample & Buy Not Available
CSD25402Q3A  P-Channel NexFET Power MOSFET  MOSFETs  Sample & Buy Not Available
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TPS61022  8-A boost converter with 0.5-V ultra-low input voltage  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS610981  Low Input Voltage Synchronous Boost Converter with Integrated LDO/Load Switch  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TPS62147  3-17V 2.0A Step-Down Converter with 1% accuracy and PFM/Forced-PWM in 2x3QFN  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS62173  3–17V 0.5A Step-Down Converter in 2x2 QFN package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD15571Q2 WSON (DQK)| 6 Download
CSD25402Q3A VSONP (DNH)| 8 Download
TL431 Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
Download Download
TPS61022 Download Download
TPS610981 Download Download
TPS62147 Download Download
TPS62173 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date
PDF 1724 06 Mar 2019
Design files (6)
Title Abstract Type Size (KB) Date
ZIP 151 06 Mar 2019
ZIP 659 06 Mar 2019
PDF 251 06 Mar 2019
PDF 224 06 Mar 2019
PDF 31 06 Mar 2019
PDF 199 06 Mar 2019

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