CN213934661U - LDO voltage stabilizer with ultra-wide working voltage range - Google Patents
LDO voltage stabilizer with ultra-wide working voltage range Download PDFInfo
- Publication number
- CN213934661U CN213934661U CN202023204993.4U CN202023204993U CN213934661U CN 213934661 U CN213934661 U CN 213934661U CN 202023204993 U CN202023204993 U CN 202023204993U CN 213934661 U CN213934661 U CN 213934661U
- Authority
- CN
- China
- Prior art keywords
- charge pump
- voltage
- error amplifier
- driving tube
- detection module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model belongs to the technical field of electronic technology, in particular to super wide operating voltage scope LDO stabiliser, including error amplifier, driving tube, adjustable resistance and resistance, the grid of driving tube is connected to error amplifier's output, and supply voltage connects the drain electrode of low pressure detection module, charge pump and driving tube, and low pressure detection module connects the charge pump and is used for the actuating signal for the charge pump, and the charge pump supplies power for error amplifier, and the one end ground connection of resistance, adjustable resistance are connected to the other end, error amplifier's negative-going input termination reference voltage, error amplifier's positive input end connection feedback voltage, the source output voltage of driving tube. The utility model discloses a low pressure detection module detects after mains voltage reduces a definite value, gives charge pump's effective start signal, because charge pump's output voltage will be higher than mains voltage, has just so extended error amplifier's operating voltage lower limit to reach the purpose that lets LDO work under wide voltage range.
Description
Technical Field
The utility model belongs to the technical field of the electron science and technology, in particular to super wide operating voltage scope LDO stabiliser.
Background
LDO (Low Dropout Linear regulator) regulators have been widely used in portable electronic products and terminals using batteries as power sources. Because the output voltage of the battery has great change along with the difference of electric quantity, in order to provide a constant supply voltage for the circuit, the output of the battery is connected with an LDO voltage stabilizer many times, because the LDO can both output a stable voltage in a wider power voltage range, and can also accomplish lower power consumption, therefore the LDO voltage stabilizer has obtained rapid development. The larger the working voltage range of the LDO is, the wider the applicable range is, and the longer the endurance time can be achieved under the same power consumption condition. The upper limit of the LDO operating voltage range is determined by the process (once the process determines that the upper limit cannot be changed), and the lower limit is mainly the minimum LDO voltage drop, which is defined as the difference between the minimum input voltage and the output voltage required to ensure a stable output voltage under a certain load. The smaller the minimum voltage drop of the LDO, the lower the working voltage of the LDO, the wider the working voltage range. The minimum voltage drop of the early LDO is 1V-3V, the minimum voltage drop of the later-stage LDO can be 0.3V-0.6V, the latest LDO at present can be about 0.1V-0.3V by adopting an MOSFET, and the current technology is difficult to realize if smaller voltage drops such as dozens of millivolts are required.
SUMMERY OF THE UTILITY MODEL
For solving the problem mentioned in the background art, the utility model discloses an ultra wide operating voltage scope LDO stabiliser is demonstrated.
In order to achieve the above purpose, the following technical solutions are provided:
an LDO voltage stabilizer with an ultra-wide working voltage range comprises an error amplifier EA, a driving tube MP, an adjustable resistor R1 and a resistor R2, wherein the output end of the error amplifier EA is connected with the grid electrode of the driving tube MP, a power supply voltage VDD is connected with a low voltage detection module LVD, a charge pump Charge Pump and the drain electrode of the driving tube MP, the low voltage detection module LVD is connected with the charge pump Charge Pump for supplying a starting signal of the charge pump Charge Pump, the charge pump Charge Pump is connected with a clock signal, the charge pump Charge Pump supplies power to the error amplifier EA, one end of the resistor R2 is grounded, the other end of the resistor R2 is connected with the adjustable resistor R1 and is connected with the source electrode of the driving tube MP, the negative input end of the error amplifier EA is connected with a reference voltage VREF, the positive input end of the error amplifier EA is connected with a feedback voltage VFB, and the source electrode of the driving tube MP outputs a voltage VOUT.
Furthermore, one path of the low voltage detection module LVD is connected to the charge pump ChargePump and is configured to provide a path of start signal for the charge pump ChargePump, and the charge pump ChargePump is connected to a path of clock signal.
Furthermore, the two paths of the low-voltage detection module LVD are connected to the charge pump ChargePump and used for providing two paths of start signals for the charge pump ChargePump, and the charge pump ChargePump is connected to two paths of clock signals.
The utility model has the advantages that:
the utility model relates to a super wide operating voltage scope LDO stabiliser sets up a charge pump and low pressure detection module, and low pressure detection module detects supply voltage and reduces to a definite value after, for the effective start signal ST of charge pump, the charge pump begins to start, because the output voltage VG of charge pump will be higher than supply voltage, has just so extended error amplifier's operating voltage lower limit to reach the purpose that lets LDO work under wide voltage range.
Drawings
FIG. 1 is a circuit diagram of embodiment 1;
FIG. 2 is a waveform diagram of example 1
FIG. 3 is a circuit diagram of embodiment 2;
FIG. 4 is a waveform diagram of example 2.
Detailed Description
In order to make the technical solutions of the present invention clearer and clearer for those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1-2, an LDO regulator with an ultra-wide operating voltage range includes an error amplifier EA, a driving tube MP, an adjustable resistor R1, and a resistor R2, where an output end of the error amplifier EA is connected to a gate of the driving tube MP, a power supply voltage VDD is connected to a low voltage detection module LVD, a charge pump ChargePump, and a drain of the driving tube MP, the low voltage detection module LVD is connected to the charge pump ChargePump for providing a start signal of the charge pump ChargePump, the charge pump ChargePump is connected to a clock signal, the charge pump ChargePump supplies power to the error amplifier EA, one end of the resistor R2 is grounded, the other end of the resistor R1 is connected to a source of the driving tube MP, a negative input end of the error amplifier EA is connected to a reference voltage VREF, a positive input end of the error amplifier EA is connected to a feedback voltage VFB, and a source output voltage VOUT of the driving tube MP.
One path of the low-voltage detection module LVD is connected with a charge pump ChargePump and used for providing one path of starting signals for the charge pump ChargePump, and the charge pump ChargePump is connected with one path of clock signals.
The low-voltage detection module LVD detects a power supply voltage VDD, when the power supply voltage VDD is lower than a certain value, a starting signal ST of a charge pump ChargePump is given, the charge pump ChargePump outputs a VG which is higher than the power supply voltage VDD to supply power to an error amplifier EA, a clock signal CLK is an input clock signal of the charge pump, the charge pump ChargePump is supplied with power by the power supply voltage VDD, and the working principle is as follows:
when the power supply voltage VDD is higher, the charge pump Charge is not started, the output voltage VG of the charge pump Charge is equal to the power supply voltage VDD and is equivalent to the power supply voltage VDD to supply power to the error amplifier EA; when the power supply voltage VDD is reduced to a certain value, the low voltage detection module LVD detects the voltage value, and then provides an effective start signal ST of the charge pump ChargePump, which starts to start.
Example 2
As shown in fig. 3-4, the LDO regulator with an ultra-wide operating voltage range includes an error amplifier EA, a driving tube MP, an adjustable resistor R1, and a resistor R2, where an output end of the error amplifier EA is connected to a gate of the driving tube MP, a power supply voltage VDD is connected to a low voltage detection module LVD, a charge pump ChargePump, and a drain of the driving tube MP, the low voltage detection module LVD is connected to the charge pump ChargePump for providing a start signal of the charge pump ChargePump, the charge pump ChargePump is connected to a clock signal, the charge pump ChargePump supplies power to the error amplifier EA, one end of the resistor R2 is grounded, the other end of the resistor R1 is connected to the source of the driving tube MP, a negative input end of the error amplifier EA is connected to a reference voltage VREF, a positive input end of the error amplifier EA is connected to a feedback voltage VFB, and a source output voltage VOUT of the driving tube MP.
The two paths of the low-voltage detection module LVD are connected with the charge pump ChargePump and used for providing two paths of starting signals for the charge pump ChargePump, and the charge pump ChargePump is connected with two paths of clock signals.
The low voltage detection module LVD detects that the power voltage has two levels (set as V1, V2, and V1> V2), and correspondingly provides the start signals ST1, ST2, the charge pump ChargePump inputs two clock signals CLK1, CLK2, and the charge pump ChargePump has two modes: the working principle of the normal mode and the enhanced mode is as follows:
when the power supply voltage VDD is higher, the charge pump Charge is not started, the output voltage VG of the charge pump Charge is equal to the power supply voltage VDD, and the power supply voltage VDD is equivalent to the power supply voltage VDD to supply power to the error amplifier EA; when the power supply voltage VDD is lowered to V1, the low voltage detection module LVD detects that the power supply voltage VDD is lowered, and provides the enable signal ST1, the charge pump ChargePump circuit starts to operate and enters the normal mode, and the output voltage VG of the charge pump ChargePump is higher than the power supply voltage VDD by a certain amount, so that the error amplifier EA continues to operate. When the power supply voltage VDD continues to drop to V2, the low voltage detection module LVD provides a start signal ST2 to trigger the charge pump ChargePump to enter the boost mode, so that the difference between the output voltage VG of the charge pump ChargePump and the power supply voltage VDD is further increased, and the error amplifier EA can still operate normally, thereby further widening the lower limit of the operating voltage of the error amplifier EA. Through the two-stage action of the two modes, the purpose of enabling the LDO to work in the ultra-wide voltage range of the power voltage VDD is achieved. Under the design, the minimum voltage drop of the LDO can easily reach about 20-50 mV.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and those skilled in the art can make many variations and modifications of the present invention without departing from the scope of the present invention by using the method and contents disclosed above.
Claims (3)
1. The LDO voltage stabilizer with the ultra-wide working voltage range is characterized in that: the high-voltage power supply circuit comprises an Error Amplifier (EA), a driving tube (MP), an adjustable resistor (R1) and a resistor (R2), wherein the output end of the Error Amplifier (EA) is connected with the grid electrode of the driving tube (MP), a power supply Voltage (VDD) is connected with the drain electrodes of a low-voltage detection module (LVD), a charge pump (Charge Pump) and the driving tube (MP), the low-voltage detection module (LVD) is connected with the charge pump (Charge Pump) and used for supplying a starting signal to the charge pump (Charge Pump), the charge pump (Charge Pump) is connected with a clock signal and supplies power to the Error Amplifier (EA), one end of the resistor (R2) is grounded, the other end of the resistor (R1) is connected with the source electrode of the driving tube (MP), the negative input end of the Error Amplifier (EA) is connected with a reference Voltage (VREF), the positive input end of the Error Amplifier (EA) is connected with a feedback Voltage (VFB), and the source electrode of the driving tube (MP) outputs a Voltage (VOUT).
2. The ultra-wide operating voltage range LDO regulator of claim 1, wherein: one path of the low-voltage detection module (LVD) is connected with a charge pump (Charge Pump) and used for providing one path of starting signals for the charge pump (Charge Pump), and the charge pump (Charge Pump) is connected with one path of clock signals.
3. The ultra-wide operating voltage range LDO regulator of claim 1, wherein: the low-voltage detection module (LVD) is connected with the charge pump (Charge pump) in two ways and used for providing two ways of starting signals for the charge pump (Charge pump), and the charge pump (Charge pump) is connected with two ways of clock signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023204993.4U CN213934661U (en) | 2020-12-25 | 2020-12-25 | LDO voltage stabilizer with ultra-wide working voltage range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023204993.4U CN213934661U (en) | 2020-12-25 | 2020-12-25 | LDO voltage stabilizer with ultra-wide working voltage range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213934661U true CN213934661U (en) | 2021-08-10 |
Family
ID=77156309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023204993.4U Active CN213934661U (en) | 2020-12-25 | 2020-12-25 | LDO voltage stabilizer with ultra-wide working voltage range |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213934661U (en) |
-
2020
- 2020-12-25 CN CN202023204993.4U patent/CN213934661U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101923110B (en) | Method and device for detecting abnormal current of circuit | |
| CN101520668B (en) | Voltage regulator | |
| CN101145699B (en) | Power supply system and method for controlling output voltage | |
| CN103475223A (en) | Step-down converter | |
| CN103218003B (en) | Low-dropout voltage stabilizer with multiple power sources input | |
| CN101615046A (en) | The linear voltage regulator of a kind of ultra low differential pressure and big driving force | |
| US10680504B2 (en) | Bandgap reference circuit and DCDC converter having the same | |
| CN107508465A (en) | Constant on-time type boost-voltage regulator | |
| CN111555616B (en) | Power management system and method | |
| CN110048607A (en) | A kind of conversion circuit and implementation method of seamless switching boosting and straight-through operating mode | |
| CN110071630A (en) | A kind of conversion circuit and implementation method of seamless switching decompression and straight-through operating mode | |
| CN201527594U (en) | Ultra-low dropout and high-driving power linear voltage regulator | |
| CN101102080B (en) | Startup circuit of voltage elevation regulator and its startup method | |
| CN213934661U (en) | LDO voltage stabilizer with ultra-wide working voltage range | |
| CN111555416B (en) | Battery charge-discharge control circuit | |
| CN211236735U (en) | Precise constant-voltage source circuit | |
| CN116782092B (en) | Audio power amplifier voltage stabilizing control circuit, chip and audio power amplifier device | |
| US10797596B2 (en) | Transient booster for zero static loadline switching regulator | |
| CN210005944U (en) | linear voltage-reducing and voltage-stabilizing circuit suitable for internal power supply of DC-DC circuit | |
| CN103457465A (en) | Constant-current/constant-voltage DC-DC conversion system with external adjustable current-limiting function | |
| CN112711289A (en) | LDO voltage stabilizer with ultra-wide working voltage range | |
| CN216748572U (en) | Input/output low-voltage difference circuit | |
| CN214755593U (en) | Constant voltage and constant current charging control circuit and switching power supply | |
| CN116846215A (en) | Charge pump circuit | |
| CN212367130U (en) | Switching power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |