A 1.24 μA 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 journalArticle

7 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 μF output capacitor. Designed in a 0.25 μm 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)
JournalIEEE Journal of Solid-State Circuits
DOIs
StateAccepted/In press - Apr 24 2018

Keywords

  • Adaptive biasing
  • Capacitors
  • Charge pumps
  • dynamic biasing
  • hybrid biasing
  • Logic gates
  • low IQ low dropout (LDO)
  • MOS devices
  • NMOS LDO
  • on-demand buffer
  • Regulators
  • relaxation oscillator
  • switched-capacitor tracking compensation.
  • Switches
  • Transient analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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