The LT1997-2 is an attenuating (funnel) difference amplifierthat can be used to translate large differential signals tothe low voltage range compatible with ADCs. It combinesa precision operational amplifier with highly-matched resistorsto form a one-chip solution to attenuate and levelshift voltages accurately using no external components.It comes with three standard pin-selectable gain options(0.1, 0.2 and 0.25), which can be further combined toform gains from 0.0455 to 0.55 (attenuations of 1.82 to22) with accuracy of 0.006% (60ppm). The LT1997-2 alsoworks across a very wide input common-mode voltagerange (?255V), enabling robust operation in demandingindustrial environments. Its excellent resistor matchingresults in a common mode rejection ratio of greater than105dB.The resistors maintain their excellent matching overtemperature; the matching temperature coefficient isguaranteed less than 1ppm/?C. The resistors are extremelylinear with voltage, resulting in a gain nonlinearity of lessthan 2ppm.The LT1997-2 is fully specified at 5V and ?15V suppliesand from ?40?C to 125?C. The device is available in spacesaving 16-lead MSOP and 4mm ? 4mm DFN14 packages.APPLICATIONS High Voltage to Low Voltage Level Translation ADC Driver Bidirectional Wide Common Mode Range Voltage and Current Sensing Industrial Data-Acquisition Front-Ends Replacement for Isolation Circuits Differential to Single-Ended Conversion

The LTC4125 is a simple and high performance monolithic full bridge resonant driver capable of delivering over 5W of power wirelessly to a properly tuned receiver. The device controls the current flow in a series connected transmit coil LC network to create a simple, safe and versatile wireless power transmitter.The LTC4125 automatically adjusts its driving frequency to match the LC network resonant frequency. This AutoResonant switching allows the device to deliver maximum power from a low voltage input supply (3V to 5.5V) to a tuned receiver. To optimize system efficiency, the LTC4125 employs a periodic transmit power search and adjusts the transmission power based on the receiver load requirements. The device stops delivering power during a fault condition, or if a foreign object is detected.The LTC4125 also includes a programmable maximum average input current limit and an NTC input as additional means for foreign object and overload protection. The LTC4125 is available in a 20-lead low profile (0.75mm) 4mm ? 5mm QFN package.Applications Hermetically and/or Electrically Insulated Devices Military Sensors and Devices Medical Equipment Industrial Handhelds

The LTC4091 is a 36V Li-Ion battery charger and power backup manager. The integrated step-down switching regulator charges a battery from a primary power source while providing power to the load. If primary power is lost, the load is seamlessly transitioned to the backup Li-ion/polymer battery. To protect sensitive downstream loads, the maximum output voltage is 4.45V.The LTC4091 provides an adaptive output that tracks the battery voltage for high efficiency charging. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured is a termination timer and an NTC thermistor input used to monitor battery temperature while charging.During backup, an internal 75m? ideal diode connects the battery to the load. An optional external ideal diode FET driver is available to reduce the voltage drop even further. 4.1V or 4.2V battery charge voltages can be selected.Applications Fleet and Asset Tracking Automotive GPS Data Loggers Automotive Telematics Systems Battery Backup Systems

The LTM4622A is a complete dual 2A step-down switching mode ?Module? (micromodule) regulator in a tiny ultrathin 6.25mm ? 6.25mm ? 1.82mm LGA and 2.42mm BGA packages. Included in the package are the switching controller, power FETs, inductor and support components. Operating over an input voltage range of 3.6V to 20V, the LTM4622A supports an output voltage range of 1.5V to 12V, set by a single external resistor. Its high efficiency design delivers dual 2A continuous, 3A peak, output current. Only a few ceramic input and output capacitors are needed.The LTM4622A supports selectable Burst Mode operation and output voltage tracking for supply rail sequencing. Its high switching frequency and current mode control enable a very fast transient response to line and load changes without sacrificing stability.Fault protection features include input overvoltage, output overcurrent and overtemperature protection.The LTM4622A is available with SnPb (BGA) or RoHS compliant terminal finish. Vin Range Vout Range Iout LTM4622 3.6V to 20V 0.6V to 5.5V Dual 2.5A or Single 5A LTM4622A 3.6V to 20V 1.5V to 12V Dual 2A or Single 4A APPLICATIONS General Purpose Point-of-Load Conversion Telecom, Networking and Industrial Equipment Medical Diagnostic Equipment Test and Debug Systems

Demonstration circuit DC2575A is a 60V 2MHz synchronous buck-boost LED driver featuring the LT8391A. It accepts an input voltage from 4V to 60V and drives a single string of LEDs up to 16V at 1.5A. DC2575A runs at 2MHz switching frequency and features spread spectrum frequency modulation (SSFM) which can be enabled with a simple jumper. SSFM spreads the switching frequency from fSW to fSW + 25% for reduced EMI. SSFM is not necessary in applications where EMI is not important.

The LTC6952 is a high performance, ultralow jitter,JESD204B/C clock generation and distribution IC. Itincludes a Phase Locked Loop (PLL) core, consisting ofa reference divider, phase-frequency detector (PFD) witha phase-lock indicator, ultralow noise charge pump andinteger feedback divider. The LTC6952?s eleven outputscan be configured as up to five JESD204B/C subclass1 device clock/SYSREF pairs plus one general purposeoutput, or simply eleven general purpose clock outputs fornon-JESD204B/C applications. Each output has its ownindividually programmable frequency divider and outputdriver. All outputs can also be synchronized and set toprecise phase alignment using individual coarse half-cycledigital delays and fine analog time delays.For applications requiring more than eleven total outputs,multiple LTC6952s can be connected together using theEZSync or ParallelSync synchronization protocols.Applications High Performance Data Converter Clocking Wireless Infrastructure Test and Measurement

Demonstration Circuit 2611A features the LTC6955-1, Ultralow Jitter 11 Output Fanout Buffers. By default, the DC2611A is powered from a single 3.3V supply. An option is provided to power to the DC2611A from dual supplies, allowing for the LTC6955-1’s output supply pins to connect to an LTC Silent Switcher® and the LTC6955-1 input supply pin to connect to a low noise LDO. The differential inputs and six of the differential outputs are populated with 0.5" spaced SMA connectors. These outputs are AC-coupled with 50Ω transmission lines making them suitable to drive 50Ω impedance instruments. All registered trademarks and trademarks are the property of their respective owners. The remaining four differential outputs are terminated with 100Ω. A calibration path is provided to aid in accurate LTC6955-1 propagation delay measurements. The calibration path can be also reconfigured as a DC path, which allows for a convenient method of locking the LTC6955-1 outputs to an external PLL/VCO.

Demonstration circuit 2638A-C is a high efficiency, high density, μModule regulator with 4.5V to 16V input range. The output voltage is adjustable from 0.5V to 3.3V, and it can supply 200A maximum load current. The demo board has four LTM4678 μModule® regulators, and the LTM4678 is a dual 25A or single 50A step-down regulator with PMBus power system management. Please see LTM4678 data sheet for more detailed information. DC2638A-C powers up to default settings and produce power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay® onto your PC and use ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status. GUI Download: The software can be downloaded from: LTpowerPlay. For more details and instructions of LTpowerPlay, please refer to LTpowerPlay GUI for LTM4678 Quick Start Guide.

The LTC4041 is a complete supercapacitor backup system for 2.9V to 5.5V supply rails. It contains a high current step-down DC/DC converter to charge a single supercapacitor or two supercapacitors in series. When input power is unavailable, the step-down regulator operates in reverse as a step-up regulator to backup the systemoutput from the supercapacitor(s).The LTC4041?s adjustable input current limit function reduces charge current to protect the input supply from overload while an external disconnect switch isolates theinput supply during backup. When the input supply drops below the adjustable PFI threshold, the 2.5A boost regulator delivers power from the supercapacitor to the systemoutput.An optional input overvoltage protection (OVP) circuit protects the LTC4041 from high voltage damage at the VIN pin. An internal supercapacitor balancing circuit maintainsequal voltages across each supercapacitor and limits the maximum voltage of each supercapacitor to a pre-determined value. The LTC4041 is available in a low profile (0.75mm) 24-Lead 4mm ? 5mm QFN package.ApplicationsRide-Through ?Dying Gasp? SuppliesHigh Current Ride-Through 3V to 5V UPSPower Meters/Industrial AlarmsServers/Solid State Drives

The LTC4162-L is an advanced monolithic synchronous step-down switching battery charger and PowerPath? manager that seamlessly manages power distribution between input sources such as wall adapters, backplanes, solar panels, etc., and a rechargeable Lithium-Ion/Polymer battery.A high resolution measurement system provides extensive telemetry information for circuit voltages, currents, battery resistance and temperature which can all be read back over the I2C port. The I2C port can also be used to configure many charging parameters including charging voltages and currents, termination algorithms and numerous system status alerts.The LTC4162-L can charge Lithium-Ion cell stacks from 1 cell to 8 cells with as much as 3.2A of charge current.The power path topology decouples the output voltage from the battery allowing a portable product to start up instantly under very low battery voltage conditions.The LTC4162-L is available in a thermally enhanced 28-pin 4mm ? 5mm ? 0.75mm QFN surface mount package.

Demonstration circuit 2664A is a VCO Rider Board with Loop Filter that supports the popular 0.5" × 0.5" VCO package footprint. The DC2664A expedites evaluation of Phase-Locked Loop (PLL) devices requiring an external Voltage Controlled Oscillator (VCO). Without the DC2664A, each VCO and PLL combination requires a unique loop filter design, resulting in several PLL demo board modifications to evaluate each VCO. These board modifications are time consuming and often result in damage to either the PLL or the VCO. The DC2664A integrates the VCO and loop filter allowing these unique designs to reside on multiple DC2664As. The DC2664A RFOUT and VTUNE SMA connections allow the user to quickly evaluate a PLL with multiple VCOs without risk of damage from multiple board modifications. VCOs are notoriously sensitive to power supply noise and spurs. The DC2664A resolves the concern of locating a low noise and low spurious lab supply by powering the VCO with an onboard ultralow noise and ultrahigh PSRR LDO, the LT3042. A second LT3042 LDO is available on the DC2664A to power an active loop filter. Both LDOs are powered from a single supply, simplifying the number of lab supplies required to evaluate a VCO and PLL combination. The DC2664A was designed to mate directly with the LTC6955 (DC2611A) and LTC6952 (DC2609A) demo boards.

Demonstration circuit 2674A is a 140V high efficiency switching surge stopper featuring the LTC7862. The board operates from an input voltage range of 8V to 140V, and provides a 8V to 34V output from 0A to 10A. Its output voltage is programmed to be clamped at 34V (typical) with a minimum ride-through duration of 500ms to allow the load to operate through the input overvoltage events. Its output current is limited to protect against output short-circuit faults. A soft-start feature is utilized to control its output voltage slew rate at start-up and input voltage transients. This feature reduces current surge and output voltage overshoot. The demonstration board is able to achieve low insertion drop (210mV typical) by utilizing the low RDS(ON) N-channel MOSFETs and low DCR inductor. This board also includes optional reverse polarity protection circuit which protects the downstream loads up to −40V. The demonstration circuit is suitable for a wide range of automotive, industrial, and telecom applications. The LTC7862 high efficiency switching surge stopper protects loads from input high voltage transients. During an input overvoltage event, the LTC7862 controls the gate of two external N-channel MOSFETs and operate as a switching DC/DC step-down regulator. The output voltage is maintained at a safe level, allowing the loads to continue to operate through the input overvoltage events. During normal operation, the LTC7862 turns on the top external N-channel MOSFET continuously, passing the input voltage through to the output with minimal voltage drop. The LTC7862 also limits the maximum output current to protect against overcurrent and short-circuit faults. A programmable timer limits the time that the LTC7862 can spend switching during an overvoltage, overcurrent, or startup condition. When the timer expires, the external MOSFETs are turned off for a cooldown period and then the LTC7862 restarts. The timer limits how long the LTC7862 can switch when the power loss is relatively high, the components and thermal design can be optimized for normal pass-through operation. The LTC7862 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2674A. Proper board layout is essential for maximum thermal and electrical performance. See the data sheet sections for details. The LTC7862 is available in 20-lead TSSOP and QFN packages and two operating junction temperature grades: industrial (−40°C to 125°C) and high temperature automotive (−40°C to 150°C).

Demonstration circuit 2686A is a 1.3A 8-switch matrix LED dimmer system with an I2C to CAN-physical transceiver featuring the LT3967 and LT3960. This demonstration circuit connects directly to a LED string and LED driver demonstration circuit to allow for independent dimming control of up to 8 channels of LEDs. A Linduino® One demonstration circuit is used to interface with the board and can connect in one of two different ways: Connect directly to a Linduino One demonstration circuit with a QuikEval™ ribbon cable. Connect using the LT3960 break-off board to connect to the I2C master device, but pass data over two twisted pair lines to the LT3960 on the main PCB. The LT3967 matrix dimmer features 8 individually con-trolled 1.3A rated floating NMOS switch channels and can support up to 56V of LEDs per device. The channels of the LT3967 can be configured for series connections, or non-series connections. Additional DC2686A demo circuits can be connected in series for higher number of LEDs, or in parallel to allow for higher current operation. Resistors are used to configure both the I2C slave address as well as the default start-up state. The default configuration for DC2686A sets the I2C address as 0000 with all LEDs off. See the LT3967 data sheet for details. The LT3960 I2C to CAN-Physical transceiver is used to send and receive I2C data through harsh or noisy environments at up to 400kb/s using the CAN-Physical layer for differential signaling over twisted pair connections. Both SDA and SCL data lines are converted to differential signals and are shared between devices connected to the bus. This allows for physical separation of the I2C source with the LT3960 transceiver board and the LT3967 main PCB along with the LED driver. This demo circuit is designed to be easily configured and interfaced with a compatible low output capacitance LED driver and LED string. It can easily be directly attached to a buck LED driver or a floating buck-mode LED driver. More sophisticated setups with series matrix dimmers for higher number of LEDs such as 12 or 16 is possible. Please consult factory applications for details or look for more details on analog.com. The LT3967 and LT3960 data sheets give complete description of the parts, their operation and applications information. The data sheets must be read in conjunction with the demo manual for demonstration circuit DC2686A. The LT3967EFE is assembled in a thermally enhanced 28-lead TSSOP package. The LT3960EMSE is assembled in a 10-lead MSOP package.

The LTC4376 is a 7A ideal diode that uses an internal 15m? N-channel MOSFET to replace a Schottky diode when used in diode-OR and high current diode applications. The LTC4376 reduces power consumption, heat dissipation and PC board area.The LTC4376 controls the forward voltage drop across the internal MOSFET to ensure smooth current delivery without oscillation even at light loads. If a power source fails or is shorted, a fast turn-off minimizes reverse current transients. The LTC4376 also easily ORs power sources to increase total system reliability.With its low operating voltage, small solution size and the ability to withstand reverse input voltage, the LTC4376 excels in portable battery applications. A shutdown mode is available to reduce the quiescent current to 9?A. The SHDN pin can also control the forward current path when an external MOSFET is used in series with the internal MOSFET in a back-to-back configuration.Applications Automotive Battery Protection Redundant Power Supplies Portable Battery Devices Computer Systems/Servers

The LTC7001 is a fast high side N-channel MOSFET gate driver that operates from input voltages up to 135V. It contains an internal charge pump that fully enhances an external N-channel MOSFET switch, allowing it to remain on indefinitely.Its powerful driver can easily drive large gate capacitances with very short transition times, making it well suited for both high frequency switching applications or static switch applications that require a fast turn-on and/or turn-off time.The LTC7001 is available in the thermally enhanced 10-lead MSOP package.APPLICATIONS Static Switch Driver Load and Supply Switch Driver Electronic Valve Driver High Frequency High Side Gate Driver

DC271A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

The LT8301 is a micropower isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor. Internal compensation and soft-start further reduce external component count. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 1.2A, 65V DMOS power switch is integrated along with all high voltage circuitry and control logic into a 5-lead ThinSOT? package.The LT8301 operates from an input voltage range of 2.7V to 42V and can deliver up to 6W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.Applications Isolated Telecom, Automotive, Industrial, Medical Power Supplies Isolated Auxiliary/Housekeeping Power Supplies

The LTC2972 is a 2-channel Power System Manager used to sequence, trim (servo), margin, supervise, manage faults, provide telemetry and create fault logs. PMBus commands support power supply sequencing, precision point-of-load voltage adjustment and margining. DACs use a proprietary soft-connect algorithm to minimize supply disturbances. Supervisory functions include over and under voltage and temperature threshold limits for two power supply output channels as well as over and under voltage threshold limits for a single power supply input channel. Programmable fault responses can disable the power supplies with optional retry after a fault is detected. Faults that disable a power supply can automatically trigger black box EEPROM storage of fault status and associated telemetry. An internal 16-bit ADC monitors two output voltages, two output currents, two external temperatures, input voltage and current, and die temperature. Input power, energy, and output power are also calculated. A programmable watchdog timer monitors microprocessor activity for a stalled condition and resets the microprocessor if necessary. A single wire bus synchronizes power supplies across multiple ADI Power System Management (PSM) devices. Configuration EEPROM with ECC supports autonomous operation without additional software.APPLICATIONS Computers and Network Servers Industrial Test and Measurement High Reliability Systems Video and Medical Imaging

Demonstration Circuit DC2747A features the LTC3315A dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 2.0MHz. One regulator provides a 1.2V output and the other provides 1.8V, both up to a 2A load. The LTC3315A supports adjustable output voltages from 0.5V to VIN, operating frequencies from 1MHz up to 3MHz. The LTC3315A is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high VIN to low VOUT conversion at high frequency. The DC2747A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315A to sync to a clock frequency from 1MHz to 3MHz. The LTC3315A operates in Forced Continuous mode when syncing to an external clock. The LTC3315A data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo. The LTC3315A is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The PCB Considerations section in the data sheet. The Efficiency vs Load graph shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

The LTC7003 is a fast high side N-channel MOSFET gate driver that operates from input voltages up to 60V. It contains an internal charge pump that fully enhances an external N-channel MOSFET switch, allowing it to remain on indefinitely.Its powerful driver can easily drive large gate capacitances with very short transition times, making it well suited for both high frequency switching applications or static switch applications that require a fast turn-on and/or turn-off time.When an internal comparator senses that the switch current has exceeded a preset level, a fault flag is asserted and the switch is turned off after a period of time set by an external timing capacitor. After a cooldown period, the LTC7003 automatically retries.The LTC7003 is available in the thermally-enhanced 16-lead MSOP package.APPLICATIONS Static Switch Driver Load and Supply Switch Driver Electronic Valve Driver High Frequency High Side Gate Driver