Adding an LDO for Increased Standby Mode Efficiency Reference Design

(ACTIVE) TIDA-00393

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Key Document

Description

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.

Features
  • 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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TI Devices (2)

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
TPS54331  3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA, 30-V, Ultra-Low IQ, Wide Input Low-Dropout Regulator with Reverse Current Protection  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

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 Views TI Recommends
PDF 1196 07 Jul 2015 277
Design files (3)
Title Abstract Type Size (KB) Date Views
ZIP 495 07 Jul 2015 168
PDF 118 07 Jul 2015 255
PDF 199 07 Jul 2015 27


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