Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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TL;DR: In this article, strip-line inductors integrated with Ni80Fe20 were fabricated, electrically characterized, and compared to models, and electrical characterization included frequency dependent measurements of effective self and mutual inductance, effective resistance, coupling coefficient, and saturation effects.
Abstract: On-chip strip-line coupled inductors integrated with magnetic material are a promising technology option to enable on-chip voltage regulators for improving power management in microelectronics. We report on design methodologies where several examples of parameter tradeoffs are presented. When considered with practical integration constraints, these result in an optimized structure. Strip-line inductors integrated with Ni80Fe20 were then fabricated, electrically characterized, and compared to models. Electrical characterization included frequency dependent measurements of effective self and mutual inductance, effective resistance, coupling coefficient, and saturation effects.
85 citations
Patent•
05 Feb 2004
TL;DR: In this paper, a switchmode DC/DC converter and a linear low drop out (LDO) regulator are connected in parallel to drive a single load and the regulator senses load current to automatically transition between the appropriate voltage regulators at fixed load current levels.
Abstract: A switch-mode DC/DC converter and a linear low drop out (LDO) DC/DC regulator are connected in parallel to drive a single load Both regulators share a common voltage reference, feedback network, input supply and output such that the regulated voltage is identical during each mode of operation During heavy loads the switch-mode regulator is in operation and the linear regulator is disabled for the highest efficiency possible Conversely at light loads the linear regulator is in operation with the switch-mode regulator disabled, also maximizing the efficiency Each regulator senses load current to automatically transition between the appropriate voltage regulators at fixed load current levels The presented invention also includes a make before break transition scheme of the voltage regulators to minimize the voltage transients
85 citations
Patent•
20 Sep 1996TL;DR: In this article, a voltage regulator with load pole stabilization is disclosed, which consists of an error amplifier, an integrator which includes a switched capacitor, a pass transistor, and a feedback circuit.
Abstract: A voltage regulator with load pole stabilization is disclosed. The voltage regulator consists of an error amplifier, an integrator which includes a switched capacitor, a pass transistor, and a feedback circuit. In one embodiment, the integrator circuit includes an amplifier, a capacitor, and a switched capacitor which is driven by a voltage controlled oscillator. The voltage controlled oscillator changes its frequency of oscillation proportional to the output current. In another embodiment, the switched capacitor is driven by a current controlled oscillator whose frequency of oscillation is also proportional to the output current of the voltage regulator. When the output current demand is large, the controlled oscillators increase the frequency which decreases the effective resistance of the switched capacitor thereby changing the frequency of the zero to respond to the change in the load pole. Conversely, the effective resistance is increased as the current demand is decreased, also to respond to the decrease in load pole. The controlled oscillator may be coupled to a current sensing device that generates a scaled version of the load current and couples to the regulated voltage output. The controlled oscillator is restricted to operating voltages that are related to the regulated output voltage and a control current that is a scaled version of the load current. Consequently, the disclosed voltage regulator has high stability without consuming excess power.
84 citations
TL;DR: In this paper, the output impedance of CIC buck regulators is reduced by deriving the current control signal from the output capacitor instead of the inductor, which is shown to be mathematically equivalent to CIC with load-current feedforward.
Abstract: The output impedance of current-injection-controlled (CIC) buck regulators can be significantly reduced by deriving the current control signal from the output capacitor instead of the inductor. This technique is shown to be mathematically equivalent to CIC with load-current feedforward. Performance comparisons with normally implemented CIC and voltage control are given. >
84 citations
TL;DR: A novel magnetic core structure for symmetrical coupling of multiphase buck converter phase inductors is proposed, which overcomes several limitations of asymmetrical inductor coupling proposed so far.
Abstract: The multiphase interleaved synchronous buck converters with coupled phase inductors are being preferred for voltage regulator modules requiring low output voltage, high output current, and fast transient response since they simultaneously offer better steady-state efficiency and faster dynamic response. In this paper, a novel magnetic core structure for symmetrical coupling of multiphase buck converter phase inductors is proposed, which overcomes several limitations of asymmetrical inductor coupling proposed so far. A new analytical technique to arrive at simple dynamic equivalent circuits of the converter, as well as design guidelines for the proposed inductor structure, is presented. Experimental results from a prototype four-phase synchronous buck converter with the proposed inductor demonstrate 2% to 6% improvement in the converter efficiency compared to a similarly rated converter with uncoupled inductors while retaining the same transient performance.
84 citations