TW200835123A - An adjustable low dropout voltage regulator - Google Patents

Abstract

We propose an Adjustable Low Dropout Voltage Regulator (ALDO) which can efficiently work with power management to generate different stable voltages for multiple operation-modes circuits. Since the power consumption and the area of the ALDO are almost the same as traditional single-output low dropout voltage regulator, the ALDO can absolutely replace them and save area and power of portable devices. The adjustable low dropout voltage regulator has an adjustable reference voltage generator that can receive control signal and provide two stable reference voltages with low temperature coefficient. According to these reference voltages, the error amplifier and the feedback network construct a negative feedback structure to make the output voltage achieve expected voltage level. Moreover, the ALDO has a dynamic discharging path for accelerating the process of output voltage transforming from high voltage level to low voltage level.

Description

200835123 IX. INSTRUCTIONS: [Technical Field] The present invention relates to an adjustable output regulator, and more particularly to a low voltage having a stable operating mode with two sets of operational mode circuits. The voltage regulator can adjust the voltage of the output terminal to supply the operating voltage required by the multiple operating mode circuit components through the change of the control signal, and the high output voltage can be designed to be between 2·4ν~3〇ν; low output The voltage is set between L0V and 2.3V. [Prior Art] With the advancement of process technology, the single-chip design becomes more and more popular, and the functions of circuit components are also designed to be more and more powerful and complex. At this time, circuit components may have multiple operation modes to operate at different operating voltages. At the same time, in order to achieve low power consumption, many portable products use a power management unit (p〇wer Management Unit) to control the working time of each of the multiple operating mode private components to reduce the total power consumption of the system. FIG. 1A is a schematic diagram showing the use of the power management unit 11 to control the multi-operation mode circuit component 19, the analog circuit device 20, the digital circuit component 21, and the embedded memory 22 in a conventional portable product, wherein the analog circuit component 20 The required operating voltage is typically lower than the operating voltage required by the digital circuit component 21, so two low dropout regulators (LDO) 15, 16 need to be used to generate the operating voltages they need, respectively, while the embedded memory Body 22 itself also requires a low dropout regulator 17 to provide the operating voltage required for the idle state. Since the multi-mode circuit component itself has more operating panels, it also requires several low-dropout regulators B, I4 to generate the required operating voltage. Ik with multiple operation mode circuit components increase the complexity or the number of circuit elements 10, 200835123 included in the system is expanded, the power management cover is dimmed, and the early juice a complex complexity will follow more Stabilize the factory to generate the required operating voltage, so the low = 1 area and the loss of the damage will directly affect the system itself, if the area of the low-dropout regulator = and the consumption of _ _ _ _ The number of reductions (4) can be limited, and the circuit tree of multiple operation modes is affected. t ==, the system and circuit components are more complicated, in order to stabilize the factory and the bridge It is necessary to develop a new low-dropout stabilizer. In view of this, the inventor is in the spirit of active invention, purely a kind of "can be stabilized, sighing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing, smashing - The health-reducing calendar is a big difference. After several research experiments, the invention has been completed. [Invention] The main object of the present invention is to provide an adjustable output low-dropout regulator over control signal. „Value, and the face of the recorded _ and _ of the face pass = low secret H gap, so the design of the Lee ride invention can replace the number of the early output low pressure drop n into the mosquito rate match (four) unit Electricity (4) The whole action. The mth picture is similar to the first picture. In the explicit portable product, the power management is called 疋22 to control the tin circuit mode component 2, the _ circuit component Μ, the digital circuit = 29, and the embedded memory 3G. Schematic diagram, analog circuit component 28, digital circuit device ^ and immersive memory 30 are still traditional single-output low-dropout regulators %~% supply operation "'but not _ place lies in multiple operation mode Wei-Cai Adjustable wheel ^ 200835123 = step _ _ _ _ _, through the control signal line 32 can change the adjustable low voltage drop to stabilize the voltage of the output terminal 33. From the two pictures & - ^ Λ Λ 即 即 即 即 即 即 即 即 即 即 即 即 即 即 即 即 即 轮 轮 轮 轮 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压 低压And the loss of power cast is similar to the traditional single-wheel _ low-pressure drop stability, so the area occupied by the system in Figure 1 and the power consumed will be smaller than the system in Figure ια.

. According to the features of the present invention, the present invention can adjust the (four) low-dropout voltage regulator for supplying the operating voltage of the multiple operating mode circuit components, and can cooperate with the power management unit to adjust the output voltage, and the adjustable output has a low voltage drop. The regulator mainly includes: - an adjustable reference voltage generator for receiving _ input, and through the control signal line can generate two different sets of 疋 reference voltage '- a wrong new A|| for comparison The output voltage value and the reference voltage value, and according to the two shoes, the crane-p-type gold Weihua cast field effect transistor (four) pe MOSFET) charge the low-lining n output; - the resistance is used to adjust the output voltage value and reference Between the _; and - a thief electric path, the wire accelerates the output from high voltage to low voltage. Due to the fact that this domain is a dragon, it can provide industrial _, increase the number of system (4) voltage regulators and effectively adjust the voltage, so apply for invention patents according to law. [Embodiment] Embodiments of the present invention are described in the second figure. The second diagram of the present invention shows that the adjustable low-dropout voltage regulator of the present invention is not intended to be the main reference voltage generator with an adjustment function (Ad-ble Reference). Voltage Genemt〇r) 34 provides a reference voltage (Vref) 43. Through the change of the control signal 48, different reference voltages 43 can be generated: when the control signal 48 is set to logic zero (1〇gic zero), the reference voltage 43 Will be set equal to 2.3276V; when the control signal 48 is set to logic 12 200835123 one (logic one), the reference voltage will be set equal to 0.981V. After the reference voltage 43 is generated, it is transmitted to the negative input terminal of the error amplifier, and the error amplification factor compares the difference between the reference voltage 43 and the feedback voltage (Vf) 44, thereby generating an amplification signal (V). 〇2)45 to a P-type metal oxide semiconductor field effect transistor (p_type MOSFET) 38 and a dynamic discharge path (Dynamic Discharging Path) 41, allowing the adjustable low dropout regulator output (VQut) 50 to be performed at the appropriate time Charge and discharge, wherein the dynamic discharge path is composed of a potential transfer buffer (Levei-Shift Buffer) 36 and an N-type metal oxide semiconductor field effect transistor (N_tyPe MOSFET) 37, and the transfer buffer 36 is used for the amplifier. The output signal 45 is used for potential transfer, so that the current of the N-type metal oxide semiconductor field effect transistor is controlled to some extent. When the Tiancha test voltage 43 is larger than the feedback voltage 44, the error amplifier will generate a low-level amplifier output signal 45, a metal-oxide-semiconductor field-effect transistor 38, and a sorrow, after comparing the voltages of the two. The circuit control 4b at this time, the p-type metal oxide semiconductor field effect transistor will start to charge the adjustable low-dropout regulator output terminal according to the secret number, while the dynamic discharge circuit privately receives the low-level amplifier output. After the signal is transmitted, it will be sent to the potential transfer buffer and the buffer will be generated. The Tiger 4^N type metal oxide semiconductor field effect transistor ^, because the output of this is the low level of the Tiger 45 system, so the potential transfer buffer After the treatment of the brother, the 金-type gold rides the semi-fine body 37 to complete her arbitrage flow (destroy current) and increase the power consumption.

Off 43 is less than the feedback voltage 44. The error amplifier compares the two electric rain signals 45 to the p-type metal oxide semiconductor field effect transistor. At this time, the P-type metal oxide semiconductor field effect transistor 38 will be finished. The voltage drop regulator (4) 5 () is charged, and the dynamic discharge: after the processor is processed, the t-generating buffer output signal 46 turns on the N-type 200835123 metal bismuth turning field effect transistor 37, so that the adjustable low voltage is stabilized. Press 5G to start M. & * f Adjustable low-voltage drop-down · When the output terminal 50 is charging or discharging, it will change the feedback voltage 44 through the feedback network 42 to let the error amplifier 35 re-compare the test voltage 43 and the feedback voltage. 44, so that the charging or discharging process continues until the feedback voltage is the same as the reference voltage 43 to stop charging or discharging behavior, and at this time the output of the low-dropout regulator also produces the required output voltage value. • The feedback network 42 consists of two feedback resistors (Knowledge, Secret 9, 4), and the relationship between the adjustable low-dropout regulator output 50 and the feedback voltage 44 is % = VoutKRfi/Rfl +R^). The voltage of the adjustable low-dropout regulator output 5〇 is related to the reference voltage汜 and the feedback resistors 39 and 40. If you select a non-sample feedback network, you can get different output power values, for example. : When the reference voltage 43 is equal to 〇·98ΐν, then, =1, ¥98, the voltage value of the adjustable low-dropout regulator output terminal 5〇 is ^; if another-group feedback network is used at this time' That is, Rfl=81.9kn and Rf2=98lkn. At this time, the voltage of the output terminal 5G will become L8V. It is thus known to pass different reference voltages 43 to: • The feedback network 42 can produce different output voltage values. The reference voltage with the adjusted Wei is generated by the H 34 series fully oxidized semi-conductive field-effect transistor (CMOS) technology, and the third figure is a schematic diagram of the reference voltage generator with the adjustment function, which works mainly through self The bias current 叩Current Mirror) generates a bias current 52, and the bias current is used to conduct two Diode-Connected N-type metal oxide semiconductor field effect transistors (M1, M2>53, %, and further A reference voltage of 57 is generated. The size of the frame-type metal oxide semiconductor field effect transistor must be designed in accordance with the temperature coefficient of the bias voltage & 52 to minimize the temperature coefficient of the reference voltage π (Low Tempemture Coefficient). When the ambient temperature changes, the reference electricity 200835123 β· is also enough to hold in the range of 疋. The N-type metal oxide semiconductor field effect transistor purchase % is connected to the control signal line %, # control signal, (4) is Set the scales to do, the gold thin body field effect electric expansion 5 is turned off, this test 52 two two-pole connected N-type metal oxide semiconductor field effect transistor ^, 54 and then generate a high-level reference Turtle: Vrcm+Vgs2= 23276v; When the control Xunlin 58 is set to logic—the N-type metal oxygen-distributing conductor field-effect transistor % is turned on this day and the gated current & only flows through a two-pole connected N Metal oxide semiconductor field

A low-level reference voltage mef2=VGsi+VDs2(Mc), 8iv, is generated for the 曰-body 53 and the N-type metal oxide semiconductor field effect transistor. Through the design of the feedback secret 42, the output light value is suppressed, and the feedback network 42 is composed of two gamma-receiving resistors 39 and 4G. In order to produce the desired output voltage value in conjunction with the reference voltage illusion provided by the functional reference biometric 34, the feedback network must also have an adjustable function. Figure 4 shows the inadvertentness of the feedback network 67 including the adjustment function. The feedback network 67 is still composed of two (four) resistances, and the fractal feedback resistance (%,

Rg) 59, 6 (). The resistance of the feedback resistor (6) is (4), but the feedback resistor is composed of sub-return resistors (Ra, Rb) 6 and 62 and an N-type metal oxide semiconductor field effect transistor (MCL) 63. , its age is changed according to the control line. When the control signal line 64 is set to logic zero, its N-type metal oxide semiconductor field effect transistor 63 is turned off, and the resistance of the feedback resistor 59 is:

Rfi = Ra + Rb 'and the relationship between the voltage of the low-dropout regulator ϋ output 65 and the feedback voltage (10) is v0ut = (l + CRa + RbyRyxVf; when the control signal line 64 is set to logic - its type The bismuth oxide semiconductor field effect transistor 63 will be turned on, and the sub-return resistor

Oi does not have current flowing, so the resistance of the feedback resistor 59 is: % = ^, and the relationship between the low-dropout regulator's wheel-end illusion, the voltage and the feedback voltage 66 is: , package 15 200835123

Vout^G+KbVRf^xVf. Through the setting of the control signal line 64, the voltage of the low-voltage drop regulator terminal 65 and the feedback voltage 66 (also referred to as the reference voltage) have a different relationship, whereby the feedback network 67 is matched with the reference voltage having the adjustment function. The generators are used together to produce two desired output voltages, ranging from 1〇v to 2.3V and 2.4V to 3.0V. It can be seen from the above description that the adjustable low-dropout regulator of the present invention mainly utilizes a reference voltage generator with an adjustment function and a variable feedback network to form a feedback loop via an error amplifier, and changes through the control signal line. The reference voltage value and the feedback network resistance are matched to each other to form a desired output stable voltage, which includes a dynamic discharge path to accelerate the process of high voltage to low voltage. The invention has been shown on the silk, and the invention has its extraordinary characteristics in terms of purpose, efficacy and hair expression, and is actually a practical invention. It should be noted that the above-described embodiments are for convenience of explanation, and the scope of the invention is not limited to the above embodiments, and all the technical ideas related to the present invention fall within the scope of the present invention. [Simplified illustration] Figure 1A shows a schematic diagram of several different internal circuit components of a conventional low-dropout regulator. The Dijon power rate unit uses several conventional low-dropout regulators and an adjustable low-dropout regulator to drive the internal circuit components. Figure 2 is an overall architectural diagram of an adjustable low dropout regulator of the present invention. Figure 3 is a schematic diagram of a tactile reference voltage generator included in the tunable low-voltage regulator of the present invention. 16 200835123 Figure 3 is a schematic diagram of the feedback network included in the adjustable low-dropout regulator of the present invention. [Main component symbol description] Low-dropout regulator 13, 14, 15, 16, 17, 24, 25, 26 _ Control unit 12, 31 Adjustable low-dropout regulator 23, 501 Error amplifier 35 Reference voltage generator with regulation function 34 Dynamic discharge path 41 Power management unit 11, 22 • Multiple operating mode circuit components 18, 27 Analog circuit components 19, 28 Digital circuit components 20, 29 Move-in memory 21, 30 Control signal lines 32, 48, 58, 64 Adjustable low-dropout regulator output 33, 50, 65 Input voltage 47, 51 17 200835123 Reference Voltage 43, 57 feedback voltage 44, 66 Ground line 49 feedback network 42, 67 feedback resistor 39, 40, 59, 60 sub-return resistor 61, 62 voltage current 52 N-type metal oxide semiconductor field effect transistor 37 , 53, 54, 63 P-type metal oxide semiconductor field effect transistor 38 potential transfer buffer 36 amplifier output signal 45 buffer output signal 46 18

Claims (1)

200835123 μ, the scope of patent application: 1·- a low-dropout regulator with adjustable output voltage, used for the operating voltage of the circuit components, the adjustable wheel-powered health-saving device mainly has a mode A functional reference chain generator for providing two different sets of reference voltage values; an error amplification ^, charging and discharging the output terminal with (10) reference power and feedback voltage body and - dynamic discharge path; The feedback network, the rib adjusts the output voltage value and the reference voltage value to generate a small error in the power supply, and generates a mobile power path to accelerate the process of converting the high voltage of the output to a low voltage; and outputting the electric day and the body The current required for the load to be controlled by the error amplifier; the adjustable low-dropout regulator described in Section 1 of the Sparks section, where the reference voltage is generated System (CMOS) technology to achieve. 1 Mutual private metal secret semi-conducting field effect transistor adjustment Γ Γ 专利 专利 专利 专利 专利 专利 专利 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可The environment generates a bias current, and then drives the (four) bismuth phase of the two-striped gold-riding conductor field effect transistor to obtain the reference voltage of the large green, and simultaneously uses the 彷路电晶 to control the reference voltage value of the eight-way road The gate of the transistor is connected to the control signal line. Lu Lei 4 曰Γ 睛 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 专利 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可 可19 200835123 4 Her M 3 job title is the successor of the town, J: towel, 哆 multiple diode-connected metal oxide semiconductor field effect crystal system is two. J Funley's 5 items can be adjusted to be low, although the voltage regulator is 11, and there is a tone. The two poles made by the Xia Drum are N-type metal oxide semiconductor field effect transistors. The utility model relates to an adjustable low-fine I-pressure device as described in the application of the patent _1, wherein the error amplifier is two-stage differential to the broadcast basin. r H has its positive input end face, and the negative wheel input end receives the reference voltage generator with the adjustment Wei. The large signal will be transmitted to the output transistor and the dynamic discharge path. I-output drop 8. A low-dropout regulator as described in claim 1, wherein the output transistor system is a P-type metal oxide semiconductor field effect transistor. 9. Shishen 4 She adjusts the adjustable low-voltage dropout (4) as described in item 8, where the output cell system receives the amplified signal from the error amplifier, which in turn generates a load current to the load. 10. An adjustable low dropout regulator as described in claim J, wherein the dynamic «path further includes - potential transfer slow _ and _ discharge electric crystal. The output of the discharge transistor is connected to the output of the % buffer. The dynamic discharge path receives the amplified signal of the error amplifier to discharge the output. 11. An adjustable low dropout regulator as claimed in claim 1Q, wherein the discharge transistor used in the dynamic discharge circuit is an N-type metal oxide semiconductor field effect transistor. 12. An adjustable low dropout regulator as claimed in claim 1 wherein the feedback, ', 罔, ,,. In addition, the square circuit transistor and two feedback resistors, and the two feedback resistors form a series architecture. 20 200835123 13. If the low-voltage drop regulator described in the πth paragraph of the patent application scope is applied, the network will use the network to make the crystal circuit of the wire-type gold Weihua semiconductor field effect transistor. 14. The adjustable low-dropout regulator as described in claim _12, wherein two of the two feedback resistors are composed of two sub-return resistors, and the composition type is The tandem wood structure 'and its sub-return resistors are next to the electric circuit. The closed circuit of the circuit is connected to the control signal line. twenty one