3.3/5Vin 2A Ultra Low Noise LDO Fixed

Supervisor Open Drain or Open Collector 1 Channel SOT-143-4

The DC2875A is a demonstration system for the LTC2971 Power System Manager that interfaces to various regulators. The board contains all the circuitry needed to demonstrate a power system that utilizes two 2-channel LTC2971 devices that manage four power supplies. The four power supplies include various switching regulators for the purpose of demonstrating a variety of methods to sense voltage and current. The demo board provides a sophisticated 4-channel digitally programmable power supply system. The LTC2971 is a 2-channel I2C/SMBus/PMBus Power System Manager that features accurate input current and energy measurement and is capable of managing ±60V supplies. The device monitors input current and input voltage, and calculates input power and energy. The DC2875A demonstrates the ability of the LTC2971 to sequence, trim, margin, supervise, monitor, and log faults for four power supplies. The LTC2971 monitors each channel’s output voltage and output current and also monitors each channel’s external temperature sensor and its own internal die temperature. The DC2875A board contains four independent power supply rails. All four rails are based on DC/DC switching regulators. The +36V and +32V channels are managed by an LTC2971 and the ±24V channels are managed by an LTC2971-1. The board is pre-configured with these voltages and may be re-configured with feedback resistors. The LTpowerPlay® graphical user interface (GUI) supports this demonstration system and enables complete control of all the features of the LTC2971. Together, the LTpowerPlay software and DC2875A hardware system create a powerful development environment for designing and testing configuration settings of the LTC2971. LTpowerPlay stores these settings in the LTC2971 internal EEPROM or in a project file. The software displays all of the configuration settings and real time measurements from the Power System Management IC. Telemetry allows easy access and decoding of the fault log created by the LTC2971. The board comes preprogrammed with the EEPROM values appropriate for the four power supply rails on the DC2875A. Just plug and play! Order pre-programmed devices from Analog Devices Express (ADX) using LTpowerPlay.

The ADP1882 / ADP1883?are versatile current-mode, synchronous step-down controllers that provide superior transient response, optimal stability, and current-limit protection by using a constant on-time, pseudo-fixed frequency with a programmable current-limit, current-control scheme. In addition, these devices offer optimum performance at low duty cycles by using valley current-mode control architecture. This allows the ADP1882 / ADP1883 to drive all N-channel power stages to regulate output voltages as low as 0.8 V.The ADP1883 is the power saving mode (PSM) version of the device and is capable of pulse skipping to maintain output regulation while achieving improved system efficiency at light loads (see the Power Saving Mode (PSM) Version (ADP1883) section for more information).Available in three frequency options (300 kHz, 600 kHz, and 1.0 MHz, plus the PSM option), the ADP1882 / ADP1883 are well suited for a wide range of applications. These ICs not only operate from a 2.75 V to 5.5 V bias supply, but they also can accept a power input as high as 20 V.In addition, an internally fixed soft start period is included to limit input in-rush current from the input supply during startup and to provide reverse current protection during soft start for a pre-charged output. The low-side current-sense, current-gain scheme and integration of a boost diode, along with the PSM/forced pulse-width modulation (PWM) option, reduce the external part count and improve efficiency.The ADP1882 / ADP1883 operate over the -40?C to +125?C junction temperature range and are available in a 10-lead MSOP.

TThe ADM7154 is a linear regulator that operates from 2.3 V to5.5 V and provides up to 600 mA of load current. Using anadvanced proprietary architecture, it provides high powersupply rejection and ultralow noise, achieving excellent line andload transient response with only a 10 µF ceramic output capacitor.There are 16 standard output voltages for the ADM7154. Thefollowing voltages are available in stock: 1.2 V, 1.8 V, 2.5 V, 2.8 V,3.0 V, and 3.3 V. Additional voltages are available by specialorder: 1.3 V, 1.5 V, 1.6 V, 2.0 V, 2.2 V, 2.6 V, 2.7 V, 2.9 V, 3.1 V,and 3.2 V.The ADM7154 regulator typical output noise is 0.9 μV rms from100 Hz to 100 kHz for fixed output voltage options and1.5 nV/√Hz for noise spectral density from 10 kHz to 1 MHz. The ADM7154 is available in 8-lead, 3 mm × 3 mm LFCSP and8-lead SOIC packages, making it not only a very compactsolution, but also providing excellent thermal performance forapplications requiring up to 600 mA of load current in a small,low profile footprint.Applications Regulation to noise sensitive applications: PLLs, VCOs, and PLLs with integrated VCOs Communications and infrastructure Backhaul and microwave links

The ADP5134 combines two high performance buck regulators and two low dropout (LDO) regulators. It is available in a 24-lead 4 mm × 4 mm LFCSP.The high switching frequency of the buck regulators enables tiny multilayer external components and minimizes the board space. When the MODE pin is set to high, the buck regulators operate in forced pulse-width modulation (PWM) mode. When the MODE pin is set to low, the buck regulators operate in PWM mode when the load is above a predefined threshold. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving the light load efficiency.The two buck regulators operate out of phase to reduce the input capacitor requirement. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5134 LDO regulators extend the battery life of portable devices. The ADP5134 LDO regulators maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage of 500 mV.Regulators in the ADP5134 are activated through dedicated enable pins. The default output voltages can be externally set in the adjustable version or factory programmable to a wide range of preset values in the fixed voltage version.Applications Power for processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), and radio frequency (RF) chipsets Portable instrumentation and medical devices Space constrained devices

The AD536A is a complete monolithic integrated circuit that performs true rms-to-dc conversion. It offers performance comparable or superior to that of hybrid or modular units costing much more. The AD536A directly computes the true rms value of any complex input waveform containing ac and dc components. A crest factor compensation scheme allows measurements with 1% error at crest factors up to 7. The wide bandwidth of the device extends the measurement capability to 300 kHz with less than 3 dB errors for signal levels greater than 100 mV.An important feature of the AD536A, not previously available in rms converters, is an auxiliary dB output pin. The logarithm of the rms output signal is brought out to a separate pin to allow the dB conversion, with a useful dynamic range of 60 dB. Using an externally supplied reference current, the 0 dB level can be conveniently set to correspond to any input level from 0.1 V to 2 V rms.The AD536A is laser trimmed to minimize input and output offset voltage, to optimize positive and negative waveform symmetry (dc reversal error), and to provide full-scale accuracy at 7 V rms. As a result, no external trims are required to achieve the rated unit accuracy.The input and output pins are fully protected. The input circuitry can take overload voltages well beyond the supply levels. Loss of supply voltage with the input connected to external circuitry does not cause the device to fail. The output is short-circuit protected.The AD536A is available in two accuracy grades (J and K) for commercial temperature range (0°C to 70°C) applications, and one grade (S) rated for the −55°C to +125°C extended range. The AD536AK offers a maximum total error of ±2 mV ± 0.2% of reading, while the AD536AJ and AD536AS have maximum errors of ±5 mV ± 0.5% of reading. All three versions are available in a hermetically sealed 14-lead DIP or a 10-pin TO-100 metal header package. The AD536AS is also available in a 20-terminal leadless hermetically sealed ceramic chip carrier.The AD536A computes the true root-mean-square level of a complex ac (or ac plus dc) input signal and provides an equivalent dc output level. The true rms value of a waveform is a more useful quantity than the average rectified value because it relates directly to the power of the signal. The rms value of a statistical signal also relates to its standard deviation.An external capacitor is required to perform measurements to the fully specified accuracy. The value of this capacitor determines the low frequency ac accuracy, ripple amplitude, and settling time.The AD536A operates equally well from split supplies or a single supply with total supply levels from 5 V to 36 V. With 1 mA quiescent supply current, the device is well suited for a wide variety of remote controllers and battery-powered instruments.

The LTM4630A is a dual 18A or single 36A output switchingmode step-down DC/DC ?Module? (micromodule)regulator with wider VOUT range and higher efficiencythan LTM4630. Included in the package are the switchingcontrollers, power FETs, inductors and all supportingcomponents. Operating from an input voltage range of4.5V to 18V, the LTM4630A supports two outputs eachwith an output voltage range of 0.6V to 8V, each set by asingle external resistor. Its high efficiency design deliversup to 18A continuous current for each output. Only a fewinput and output capacitors are needed. The LTM4630Ais pin compatible with the LTM4620 and LTM4620A (dual13A, single 26A) and the LTM4630 (dual 18A, single 36A).The device supports frequency synchronization, multiphaseoperation, Burst Mode operation and output voltagetracking for supply rail sequencing and has an onboardtemperature diode for device temperature monitoring. Highswitching frequency and a current mode architecture enablea very fast transient response to line and load changeswithout sacrificing stability.Fault protection features include overvoltage andovercurrent protection. The LTM4630A is offered in 16mm? 16mm ? 4.41mm LGA and 16mm ? 16mm ? 5.01mmBGA packages.*Maximum VIN = 15V and VOUT = 5.3V with date code before 1720 Features VOUT LTM4630 0.6V to 1.8V LTM4630-1 0.8% DC and 3% Transient Accuracy 0.6V to 1.8V LTM4630A Higher Light Load Efficiency 0.6V to 5.3V Applications Telecom and Networking Equipment Storage and ATCA Cards Industrial Equipment

The ADP2386 is a synchronous step-down, dc-to-dc regulator with an integrated 44 m?, high-side power MOSFET and an 11 m?, synchronous rectifier MOSFET to provide a high efficiency solution in a compact 4 mm ? 4 mm LFCSP package. This device uses a peak current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. The switching frequency of the ADP2386 can be programmed between 200 kHz to 1.4 MHz. To minimize system noise, the synchronization function allows the switching frequency to be synchronized to an external clock.The ADP2386 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can be adjusted from 0.6 V to 90% of the input voltage and delivers up to 6 A of continuous current. Each IC draws less than 110 ?A current from the input source when it is disabled.This regulator targets high performance applications that require high efficiency and design flexibility. External compensation and an adjustable soft start function provide design flexibility. The power-good output and precision enable input provide simple and reliable power sequencing.Other key features include undervoltage lockout (UVLO), overvoltage protection (OVP), overcurrent protection (OCP), short-circuit protection (SCP) and thermal shutdown (TSD).The ADP2386 operates over the ?40?C to +125?C junction temperature range and is available in a 24-lead, 4 mm ? 4 mm LFCSP package.Applications Communications infrastructure Networking and servers Industrial and instrumentation Healthcare and medical Intermediate power rail conversion DC-to-dc point-of-load applications

Demonstration circuit 1707 is a high efficiency monolithic step-down DC/DC switching regulator designed for double-data-rate (DDR) memory termination in computer systems. The VTT output is capable of sourcing and sinking up to 6A with an output voltage equal to one-half the voltage applied to the VDDQIN terminal or one-half the input supply voltage, selected by a jumper. An additional low current output (VTTR) also equal to one-half the voltage on VDDQIN can source and sink up to 10mA. Input voltage range is from 2.25V to 5.5V with overvoltage protection for transients exceeding 6.5V.