低压差线性稳压器MAX603/MAX604及其应用

１ＭＡＸ６０３／ＭＡＸ６０４的功能特点ＭＡＸ６０３／ＭＡＸ６０４是ＭＡＸＩＭ公司生产的低压差线性稳压器 ,具有预置５Ｖ(ＭＡＸ６０３)／３．３Ｖ(ＭＡＸ６０４)或可调两种输出方式 ,其输出电流可达５００ｍＡ。ＭＡＸ６０３在５Ｖ／５００ｍＡ输出时的压差为３２０ｍＶ,在５Ｖ／２００ｍＡ输出时的压差为１３０ｍＶ;ＭＡＸ６０４在３．３Ｖ／２００ｍＡ输出时压差为２４０ｍＶ。这两款器件的功耗很低 ,静态电流典型值为１５μＡ ,最大为３５μＡ ,关断模式下的最大电流只有２μＡ。同时 ,还可以用电阻对其输出电压进行调节 ,其输出电…     

双输出低压差线性稳压器MAX8530

MAX8530是MAXIM公司生产的器件,它是一种双输出、低功耗、低压差线性稳压器。该器件主要特点:输出1(OUT1)保证输出200mA;输出2(OUT2)保证输出150mA;OUT1及OUT2有多种电压输出(详见表1),用户也可根据电路需要确定要求的OUT1及OUT2的电压(在1.5～3.3V范围之内)向工厂订货;两个电源是相互独立的并且都是低压差,在100mA输出时其压差典型值为100mV;工作电压范围2.5～6.5V;当OUT1输出电压低于87%正常输出电压时,RESET端输出100ms的复位信号(低电平有效);静态电流小,典型值130μA;有省电关闭控制,关闭状态时耗电小于1μA;内部有输…     

低压差线性稳压器

<正> MAX8873T/S/R、MAX8874T/S/R MAX8873T/S/R、MAX8874T/S/R是MAXIM公司生产的输出120mA的低压差线性稳压器。     

低压差线性稳压器

MAX6469～MAX6484系列是一种低压差线性稳压器，不同的型号在功能上有些差别。     

低压差线性稳压器UC1834及其应用

低压差线性稳压器广泛应用于开关电源的输出端和由电池从电的电子设备中，本文详细介绍了低压差线性稳压器的主要优点，还介绍了集成控制器ＵＣ１８３４的组成、工作原理和实际应用电路。     

新一代低功率低压差稳压器集成电路及其应用

低功率LDO稳压器适合于在便携式电子设备和电池供电系统中应用。本介绍了不同种类的新型LDO稳压器IC及其特点。     

新型大电流、低压差线性稳压器

便携式电子产品的迅速发展促进了电源IC的开发,其中低压差线性稳压器有较快的发展。它不仅减小了输入、输出电压的差值(称之为“低压差”),并且增加了关闭电源功能(具有电源管理功能)及电源工作状态信号输出,使进一步节省电能及更可靠地工作。     

双低压差线性稳压器MAX8862

<正> MAX8862是美国MAXIM公司生产的一种新型双低压差线性稳压器。该器件内部有主、辅两个相互独立的稳压器,分别输出250mA及100mA电流;输出电压视型号的后缀而定:后缀为L的输出电压为4.95V,T的为3.175V,R的为2.85V。另外,该器件的输出电压也可由用户通过两个外设电阻在2～11V范围内设定。     

低压差线性稳压器在开关电源中的应用

本文论述了开关电源的结构、优点和缺点，及低压差线性稳压器在开关电源中的应用。     

一种新颖的LDO线性稳压器

设计了一种新颖的LDO线性稳压器.该LDO工作于负电源,具有微功耗、自身固定-5 V输出、外接反馈电阻可实现可调输出等特点.基于0.6 μm SOI CMOS工艺进行流片.测试结果表明,该电路输入电源电压VIN为-2～-18 V,可调输出电压为-1.3 V～VIN+0.5 V@Iour=15mA.该LDO功耗低,室温下空载静态电流约4.8μA,并且几乎不随VIN变化.内部带隙电压基准采用β二阶补偿,结构简单,温度系数为1.28×10-5/℃.线性调整率为0.015％,负载调整率为0.85 Ω.     

一种低压差+5 V三端电源的研制

介绍了一种CMOS低压差 5 V三端稳压源.在电路设计上,将PMOS管作为调整管,采用带隙基准和NMOS基准两种结构,重点讨论了影响低压差电源的几个因素;在工艺上,采用硅栅自对准CMOS工艺,做出了100 mA时压差为0.3 V的 5 V三端电源.采用NMOS基准的三端稳压源,其静态电流和电源抑制比等参数优于采用带隙基准的三端稳压源.     

An Active-Frequency Compensation Scheme for CMOS Low-Dropout Regulators With Transient-Response Improvement

An active-frequency compensation circuit for low- dropout regulators (LDOs) is presented. Compared with the conventional compensation scheme, the proposed circuit can greatly boost the effective current multiplication factor by at least one order of magnitude without increasing any power consumption. Hence, the proposed circuit can generate an internal lower frequency zero and push parasitic poles toward extremely high frequency such that the loop bandwidth can be extended drastically. The required on-chip capacitance is reduced to 0.4 pF, comparing to 5 pF in the conventional compensation scheme. The slew rate at the gate drive of the LDO is also improved by the proposed error amplifier. Implemented in a 0.35- $mu$m 2P4M CMOS process, the LDO with the proposed active-frequency compensation circuit consumes 27 $mu$ A ground current at 150-mA maximum output current with a dropout voltage of 200 mV. Experimental results show that the proposed LDO structure has achieved only 10% settling time of the conventional compensation scheme.      

Leakage-Aware Droop Measurement Built-in Self-Test Circuit for Digital Low-Dropout Regulators

Transient performance is one of the most crucial design properties in digital low-dropout regulator (DLDO) design. In this paper, an improved droop measurement built-in self-test (BIST) circuit for DLDOs is presented, expanding on the previous work (Dirican et al. 2018) by the same authors. The proposed BIST system can detect and store the transient droop information using droop detector and generates a digital output with a reuse based 10-bit successive-approximation (SAR) analog-to-digital converter (ADC) with better accuracy. The improvements are achieved by employing a multi-step ramp circuit and a leakage cancellation circuit. The system is made more suitable for process scaling by replacing the analog buffer with a multi-step ramp circuit. Employing a leakage cancellation circuit solves potential leakage problems during ADC operation due to the reused decoupling capacitor of the DLDO and nearly 75% reduction in maximum measurement error is observed using this feature. Additionally, the droop detector is capable of storing transient droop information with less than 0.6% error for droop voltages ranging from 45 mV to 406 mV for a nominal DLDO output voltage of 1.6 V where the supply voltage is 1.8 V. The proposed BIST circuit is designed using a 0.18 μm CMOS process in Cadence Virtuoso and verified with corner simulations.     

射频振荡器MAX2620及其应用

本文介绍了美国MAXIM公司生产的射频振荡器MAX2620的性能特点、内部结构、引脚功能、工作原理以及应用设计过程，并给出了典型应用电路。     

微处理器监控器件MAX706及其应用

本文详细介绍了微处理器监控器件MAX706的性能、特点和工作原理，并给出该器件的典型应用电路。     

激光驱动器MAX3865及其应用

介绍带自动调制控制的激光驱动器MAX3865的工作原理，内部结构，引脚功能及设计步骤，并给出典型应用电路。     

MAX3265限幅放大器及其应用

MAX3265是美国MAXIM公司推出的一种限幅放大器，适用于工作在传输速率为2．5Gbps的光纤局域网中，可用作千兆以太网、光纤信道以及ATM局域网中的光接收器，也可用作光纤网络系统的内连设备。该产品具有传输速率高，增益大，性能安全稳定等特点。文中详细介绍了MAX3265的性能特点、内部结构、引脚定义以及具体应用过程，是后给出了典型的应用电路。     

一种新颖的BiCMOS高精度LDO线性稳压电路

设计了一种改进结构的用于锂离子和锂聚合物电池充电管理芯片的高精度、宽电源电压范围LDO线性稳压电路,电路采用0.8μm N阱BiCMOS高压工艺制作。Hspice仿真结果表明,在温度从-20℃到100℃变化时,其温度系数约为±28 ppm/℃;电源电压从4.5 V到25 V变化时,最坏情况下其线性调整率为0.038 mV/V;负载电流从0到满载2 mA变化时,其负载调整率仅为1.28 mV/mA。     

Smooth Pole Tracking Technique by Power MOSFET Array in Low-Dropout Regulators

This paper proposes an advanced $Q$-reduction technique of pole-splitting compensations for low dropout (LDO) regulator. The output pole is load dependent and may cause the scenario of complex poles when load current changes. LDO regulators may oscillate because high-$Q$ incurs the less gain and phase margins. The reasons of causing complex poles depend on the design methodology. For the design of capacitor-free LDO regulator, high-$Q$ issue happens when load current changes from heavy to light. Recent literature provides a method to alleviate the high- $Q$ problem. However, large dropout voltage in case of suddenly large loads forces designers to include a small load capacitor as an indispensable component for supplying system-on-chip (SoC) systems. Different to the case of capacitor-free LDO regulators, high- $Q$ issue happens when load current changes from light to heavy. According to our proposed power MOSFET array, the high-$Q$ problem can be alleviated and prevent LDO regulators from oscillating when load changes. Experimental results promise the stability and show the improvement of load and line regulations.