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dcdc converter

A technology of converters and appliances, which is applied in the field of DCDC converters, can solve the problems that it is difficult to safely improve power efficiency and hinder the low power consumption of electronic equipment, so as to achieve the effect of reducing current consumption and improving power efficiency

Inactive Publication Date: 2020-09-29
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, if a protection circuit and a monitoring circuit are added to the DCDC converter, electric power is required to operate the circuit, which hinders the reduction of power consumption required by electronic equipment.
Therefore, the conventional DCDC converter has the problem that it is difficult to improve power efficiency while ensuring safety

Method used

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Examples

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Embodiment Construction

[0027] figure 1 It is a circuit diagram showing an example of the DCDC converter of this embodiment. The DCDC converter 100 is a synchronous rectification type DCDC converter that converts a power supply voltage Vin input to an input terminal 1 into a constant voltage and outputs it to an output terminal 7 as an output voltage Vout.

[0028] The DCDC converter 100 of this embodiment includes a PMOS transistor 3 as a first switching element, an NMOS transistor 4 as a second switching element, an inductor 5, an output capacitor 6, an error amplifier 10, an oscillation circuit 11, a reference voltage circuit 12, and 21. Comparators 13 and 20, output control circuit 14, buffer circuits 15 and 16, voltage dividing resistors 17 and 18, overheating protection circuit 22 and power supply voltage monitoring circuit 23.

[0029] The voltage dividing resistors 17 and 18 output a feedback voltage Vfb corresponding to the output voltage Vout. The reference voltage circuit 12 outputs a re...

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PUM

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Abstract

The invention provides a DCDC converter with low power consumption and high safety. The configuration monitors the output voltage of the error amplifier, detects that the output voltage of the error amplifier is equal to or lower than a fixed value, and drives the overheat protection circuit and the power supply voltage monitoring circuit intermittently.

Description

technical field [0001] The present invention relates to a DC-DC converter, in particular to a technique for reducing current consumption at a small load. Background technique [0002] In recent years, reduction in power consumption has been pursued in electronic devices equipped with batteries. Especially in smartphones, portable devices, wearable devices, etc., there is a strong demand for lower power consumption of electronic devices in order to make the driving time longer. Therefore, reduction in power consumption is also remarkably required in semiconductor integrated circuits incorporated in the electronic equipment. [0003] On the other hand, for electronic devices that are directly handled by people such as portable devices, safety is particularly required to prevent adverse effects on human bodies such as explosions and electric shocks. [0004] A DC-DC converter built into a battery-driven electronic device that operates on battery voltage has, for example, an o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02H3/20H02H5/04
CPCH02H3/202H02H5/04H02M3/156G01K3/005G01R19/16576G01R31/40H02M1/32H02M3/158H02M1/327Y02B70/10H02H3/243H02H7/1213H02M3/155H02M1/0032
Inventor 河野明大后藤克也
Owner SII SEMICONDUCTOR CORP