dc-dc regulator
A DC-DC and regulator technology, applied in the field of DC-DC regulators, can solve the problems of high power consumption and low efficiency, and achieve the effect of reducing power consumption and prolonging use time
Active Publication Date: 2017-01-11
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of large power consumption and low efficiency of the step-down DC-DC regulator in the prior art when the load is low and standby
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[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0037] In order to facilitate the understanding of the present invention, the following will further explain and illustrate with specific embodiments in conjunction with the accompanying drawings, which are not intended to limit the embodiments of the present invention.
[0038] Below to figure 1 As an example to describe in detail the DC-DC...
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The invention relates to a DC-DC regulator, comprising: a mode selector timing the output voltage drop time TOFF corresponding to the working state flag signal T_Flag of the DC-DC module, when the output voltage drop time TOFF is greater than the load current and reaches the critical current At the first time TOFF_TH of IO_TH, the mode selector outputs the first signal TIL. When the number of the first signal TIL is continuous N times, the mode selector outputs the second signal ENM, and based on the second signal ENM, the LDO module is enabled and disabled. DC-DC module, so that the DC-DC regulator works in LDO mode; the LDO module samples the load current IO, when the load current IO is greater than m times the critical current IO_TH, the LDO module outputs the third signal IO_Flag, when the third signal IO_Flag continues When the time is greater than the second time TANTI, the mode selector outputs a fourth signal TIH, and based on the fourth signal TIH, the LDO module is disabled, and the DC-DC module is enabled, so that the DC-DC regulator works in the switching mode. When the load is low or in standby, the present invention greatly reduces the power consumption of the DC-DC regulator and prolongs the service time of the battery.
Description
technical field [0001] The invention relates to the field of electronics, in particular to a DC (Direct Current, DC)-DC regulator with ultra-low standby power consumption. Background technique [0002] In electronic systems powered by ultra-small capacity lithium batteries, step-down DC-DC regulators are used to power the system to improve efficiency and extend battery life. [0003] In the prior art, the step-down DC-DC regulator operates in a pulse width modulation (Pulse Width Modulation, PWM) mode when it is fully loaded or a relatively large load, and the efficiency at this time is relatively high, which can reach about 90%. Hours, switch to Pulse Frequency Modulation (PFM) mode, the efficiency at this time will drop, generally reaching 40%-80%; when the load tends to be no-load or standby, the efficiency is close to 0%, and the power consumption at this time It is mainly the power consumption of the internal complex analog and digital control and drive circuits. Gener...
Claims
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IPC IPC(8): H02M3/10
CPCH02M3/00H02M1/0032Y02B70/10
Inventor 王才宝王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD