Power Supply for NB-IoT Modems in Smart Meters with LiSOCl2 Batteries Reference Design
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Key Document


This reference design provides a power supply solution for NB-IoT (Narrow Band -Internet of Things ) in smart meter with LiSOCl2 Batteries applications. The design is a low standby current, high efficiency solution that will extend battery use time more than 50%.

  • Operating input voltage from 2V to 4V, fixed output voltage is 3.6V, output current is up to 320mA
  • 1μA quiescent current under light load condition
  • About 4 μA standby current at 85℃ under open load conditions
  • Up to 93% efficiency from 10mA to 320mA
  • Extend battery life time by wide input voltage range and high efficiency
  • Simulate NB-IoT load characteristic, which is easy to test
  • A small solution size with the minimum amount of external components

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Design Files

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(Output Voltage 1)
Vin (Min) (V)2
Vin (Max) (V)4
Vout (Nom) (V)3.6
Iout (Max) (A).32
Output Power (W)1.152
Input TypeDC
TopologyBoost- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18533KCS  60V, N ch NexFET MOSFET™, single TO-220, 6.3mOhm  MOSFETs  Sample & Buy Not Available
LMC555  World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
TPS61099  0.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18533KCS Download
LMC555 Download Download
TPS61099 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 710 01 Oct 2018
Design files (6)
Title Type Size (KB) Date
ZIP 1818 28 Sep 2018
ZIP 593 28 Sep 2018
PDF 456 28 Sep 2018
PDF 96 28 Sep 2018
PDF 56 28 Sep 2018
PDF 138 28 Sep 2018

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