Single chip integrated high frequency voltage descending DC-DC converter
A DC converter and monolithic integration technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problem that power inductors and filter capacitors occupy too much and it is difficult to meet rapid load changes Response, acceleration of power management circuit load changes, etc.
Inactive Publication Date: 2009-02-11
FUDAN UNIV
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Problems solved by technology
The traditional power management circuit integrates the power switch and control circuit, but the power inductor and filter capacitor are usually connected externally because they occupy too much area, which seriously restricts the monolithic integration of the power management circuit.
At the same time, the working speed of circuits represented by microprocessors continues to increase, which makes the load change of power management circuits faster. Traditional low-frequency power management circuits have been difficult to meet the requirements of fast load change response.
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0022] Such as figure 1 As shown, the monolithically integrated high-frequency step-down DC-DC converter of the present invention integrates power switches PM and NM, control circuit, drive circuit, power inductor L and filter capacitor C on the same silicon chip. The control circuit includes a voltage divider resistor R f1 and R f2 , Reference voltage circuit, soft start circuit, triangular wave generator, error amplifier, compensation network, pulse width modulation circuit and dead zone control circuit. Resistance R f1 and R f2 Divide the output voltage to get the feedback voltage V fb , connected to one input of the error amplifier. The error amplifier will be referenced to the voltage V ref and feedback voltage V fb The difference is amplified to get the error voltage V c . The compensation network is connected across the input and outp...
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The invention discloses a monolithic integrated high-frequency step-down DC-DC converter, which is characterized in that all desired elements of the DC-DC converter are integrated on the same silicon wafer. The monolithic integrated high-frequency step-down DC-DC converter comprises a power switch, a control circuit, a drive circuit, a power inductor, and a filter capacitor, wherein the control circuit includes a divider resistor, a reference voltage circuit, a soft start circuit, a triangular wave generator, an error amplifier, a compensation network, a pulse width modulation circuit, and a dead zone control circuit. The DC-DC converter has the advantages of greatly reduced entire size of a power chip, higher conversion efficiency than the ideal conversion efficiency of a low dropout regular (LDO), and rapid response to load change, and can meet the requirement for rapid load change of the power chip.
Description
technical field [0001] The invention relates to a single-chip integrated high-frequency step-down DC-DC converter that provides stable power for a VLSI system and belongs to the field of integrated circuits. Background technique [0002] As the volume and weight of portable electronic products continue to decrease, the trend of internal integration of power management chips is becoming more and more obvious. Traditional power management circuits integrate power switches and control circuits, but power inductors and filter capacitors generally use external connections because they occupy too large an area, which severely restricts the monolithic integration of power management circuits. At the same time, the operating speed of circuits represented by microprocessors continues to increase, which makes the load changes of power management circuits accelerate. Traditional low-frequency power management circuits have been difficult to meet the requirements of fast load change res...
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IPC IPC(8): H02M3/156H01L27/00
Inventor 倪金华周冬然洪志良
Owner FUDAN UNIV