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An Output-Capacitorless Low-Dropout Regulator with Slew-Rate Enhancement.

Shenglan Ni1,2, Zhizhi Chen1,2, Chenkai Hu1,2

  • 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.

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Summary
This summary is machine-generated.

This study introduces a novel output-capacitorless low-dropout regulator (OCL-LDO) with a slew-rate-enhancement (SRE) circuit. It significantly reduces output voltage variations during load transients for improved power management.

Keywords:
low-dropout regulator (LDO)output-capacitorlesspush–pullslew-rate enhancement

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Area of Science:

  • Electrical Engineering
  • Integrated Circuit Design
  • Power Management

Background:

  • Traditional low-dropout regulators (LDOs) often require large output capacitors for stability and transient response.
  • Output capacitorless LDOs offer reduced size and cost but face challenges in transient performance.
  • Voltage spikes and slow settling times are common issues in capacitorless LDO designs.

Purpose of the Study:

  • To present a novel output-capacitorless low-dropout regulator (OCL-LDO) with enhanced transient performance.
  • To introduce a slew-rate-enhancement (SRE) circuit for improved dynamic response.
  • To achieve stable power delivery with minimal output voltage variation and fast settling time.

Main Methods:

  • Development of an OCL-LDO incorporating an embedded SRE circuit.
  • Implementation of a transient current-boost strategy within the SRE circuit.
  • Integration of a feed-forward transconductance cell for a push-pull output stage.

Main Results:

  • Maximum transient output voltage variation of 23.5 mV under a 0-100 mA load current step in 100 ns (100 pF load capacitance).
  • Achieved a settling time of 1.2 μs.
  • Demonstrated a quiescent current of 30 μA and a dropout voltage of 200 mV at 100 mA output current.

Conclusions:

  • The proposed OCL-LDO with SRE effectively mitigates transient voltage variations.
  • The design offers a competitive solution for power management requiring small form factors and fast response.
  • This technology enables improved stability and efficiency in integrated power systems.