Low-power boost DC-DC converter capable of being started at ultra-low voltage

An ultra-low voltage, low power consumption technology, applied in the field of low power consumption step-up DC-DC converters

Active Publication Date: 2013-09-11
拓尔微电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the common step-up DC-DC converters on the market to meet the above requirements at the same time.

Method used

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  • Low-power boost DC-DC converter capable of being started at ultra-low voltage
  • Low-power boost DC-DC converter capable of being started at ultra-low voltage
  • Low-power boost DC-DC converter capable of being started at ultra-low voltage

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Embodiment Construction

[0013] The present invention will be further described through examples below, and the description of these examples does not limit the content of the present invention. Those skilled in the art should understand that equivalent replacements or corresponding improvements made to the contents of the present invention still fall within the protection scope of the present invention.

[0014] Such as figure 1 As shown, a low-power step-up DC-DC converter with ultra-low voltage startup of the present invention, wherein the control chip 100 has four pins, which are respectively switch pins SW, which are connected to the input voltage through an inductor; The pin EN is used to determine whether the chip 1 is turned on through an external input high / low level; the output pin Vout is used to output a fixed (such as 5V) output voltage; the GND pin is used as the reference ground of the entire chip. The internal fixed connection of the control chip 100 sets the internal power supply sel...

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PUM

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Abstract

The invention discloses a low-power boost DC-DC converter capable of being started at an ultra-low voltage. The low-power boost DC-DC converter is characterized in that an internal power selector 101, an internal reference and bias device 102, a (high-side) PMOS (P-channel metal semiconductor) power tube 103, a (low-side) NMOS (N-channel metal semiconductor) power tube 104, an inductive current detecting resistor 105, a leading edge blanking unit 106, a cycle-by-cycle overcurrent protection comparator 107, a PWM (pulse width modulation) comparator 108, a control logic and drive device 109, an oscillator 110, an ultra-low-voltage oscillator 111, a standby signal processor 112, a no-load detecting comparator 113, an error amplifier 114, an output voltage feedback divider resistor 115, an output voltage feedback divider resistor 116, a control switch 118 and an enable device 114 are arranged inside a control chip 100 in a fixedly connected manner. The low-power boost DC-DC converter is particularly suitable for boost application to backup power sources and movable power sources of mobile phones.

Description

technical field [0001] The invention relates to a low power consumption step-up DC-DC converter started by ultra-low voltage. Background technique [0002] Step-up DC-DC converters are widely used in electronic equipment. In recent years, with the rise of smart phones, the supporting mobile power supply has become more and more popular, and the step-up DC-DC converter is the main component of the mobile power supply. In order to reduce the requirements for the battery of the mobile power supply itself, people hope to move The wider the input voltage range of the DC-DC boost converter configured by the power supply, the better, the lower the battery voltage that can be used normally, the better, and the lower the operating current and standby current of the DC-DC boost converter, the better. In order to improve the utilization rate of battery energy and prolong the standby time. However, it is difficult for the common step-up DC-DC converters on the market to meet the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/04
Inventor 方建平
Owner 拓尔微电子股份有限公司
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