Adding an LDO for Increased Standby Mode Efficiency Reference Design


Design files


This regulation topology is designed to increase the efficiency of a DC/DC buck converter by disabling the converter during light-load operation and providing a regulated output voltage with a low-Iq LDO. During no-load or light-load conditions, the LDO allows for low-noise, low-Iq output voltage regulation while the DC/DC is disabled.  Once the load is engaged, the DC/DC converter can provide high efficiency at high load currents, thereby combining the benefits of both devices.

  • High Efficiency output regulation from no load to full load (3A)
  • Ultra-low Iq with no load regulation (<15 uA)
  • DC/DC output ripple less than 10mV peak to peak
  • LDO output noise less than 200 uV RMS, 10Hz to 100kHz
  • 3.3% Transient Droop @ 1.2V, 300mA to 3A, 1A/ms
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Design files & products

Design files

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TIDUAA4.PDF (1196 K)

Reference design overview and verified performance test data


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Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS543313.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

Data sheet: PDF | HTML

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* Design guide Adding an LDO for Increased Standby Mode Efficiency Design Guide Jul. 07, 2015

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