A 1.24 μ A quiescent current NMOS low dropout regulator with integrated low-power oscillator-driven charge-pump and switched-capacitor pole tracking compensation

Raveesh Magod, Bertan Bakkaloglu, Sanjeev Manandhar

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Supply regulation using low quiescent current linear regulators helps in extending the battery life of power aware applications with very long standby time. A 1.24 μA quiescent current NMOS low dropout (LDO) that uses a hybrid bias current generator (HBCG) which boosts the bias current dynamically and adaptively to improve the transient response is presented in this paper. A bias-current scalable error amplifier with an on-demand pull-up/pull-down buffer drives the NMOS pass device. The error amplifier is powered with an integrated dynamic frequency charge pump to ensure low dropout voltage. A low-power relaxation oscillator (LPRO) generates the charge pump clocks. A novel switched-capacitor pole tracking (SCPT) compensation scheme is proposed to ensure stability up to maximum load current of 150 mA with a low-ESR 1 μ F output capacitor. Designed in a 0.25 μ m CMOS process, the LDO has an output voltage range of 1-3 V, a dropout voltage of 240 mV, and a core area of 0.11 mm2.

Original languageEnglish (US)
Pages (from-to)2356-2367
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Volume53
Issue number8
DOIs
StatePublished - Aug 2018

Keywords

  • Adaptive biasing
  • NMOS LDO
  • dynamic biasing
  • hybrid biasing
  • low IQ low dropout (LDO)
  • on-demand buffer
  • relaxation oscillator
  • switched-capacitor tracking compensation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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