LINEAR Manuals

The LTC1257 is a complete single supply, 12-bit voltage output D/A converter (DAC) in an SO-8 package from Linear Technology Corporation. The LTC1257 includes an output buffer amplifier, 2.048V voltage reference and an easy to use three-wire cascadable serial interface. An external reference can be used to override the internal reference and extend the output voltage range to 12V. The power supply current is a low 350µA when operating from a 5V supply, making the LTC1257 ideal for battery-powered applications. The space-saving 8-pin SO package and operation with no external components provide the smallest 12-bit D/A system available.

The LTC4100 is a single chip intelligent battery charger controller from Infineon that supports SMBus protocol and can communicate with the host. The LTC4100 supports a voltage range of 3.5V to 26V, and the charging current can reach 4A, with charging accuracy of up to ±0.8%.

1 LT1078/LT1079 10789fe Micropower, Dual and Quad, Single Supply, Precision Op Amps is a micropower, dual and quad, single supply, precision op amp launched by Texas Instruments. It is available in 8-pin SO package. Its maximum supply current is 50µA, maximum offset voltage is 70µV, maximum offset current is 250pA, maximum input voltage range is -0.3V~+15V, maximum output voltage range is -0.3V~+15V, and maximum output current is 5mA.

LT1769 1769fa Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting

The LT1640AL/LT1640AH are 8-pin, negative voltage Hot SwapTM controllers that allow a board to be safely inserted and removed from a live –48V backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable electronic circuit breaker protects the system against shorts. The PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can be used to directly enable a power module. The LT1640AL is designed for modules with a low enable input and the LT1640AH for modules with a high enable input. The LT1640AL/LT1640AH are available in 8-pin PDIP and SO packages.

The LTC6900 is a precision, low power oscillator that is easy to use and occupies very little PC board space. The oscillator frequency is programmed by a single external resistor (RSET). The LTC6900 has been designed for high accuracy operation (≤1.5% frequency error) without the need for external trim components. The LTC6900 operates with a single 2.7V to 5.5V power supply and provides a rail-to-rail, 50% duty cycle square wave output. The CMOS output driver ensures fast rise/fall times and rail-to-rail switching. The frequency-setting resistor can vary from 10kΩ to 2

LTC2430/LTC2431 are 2.7V to 5.5V micropower 20-bit differential ∆Σ analog-to-digital converters with an integrated oscillator, 3ppm INL and 0.56ppm RMS noise. They use delta-sigma technology and provide single cycle settling time for multiplexed applications. Through a single pin, the LTC2430/LTC2431 can be configured for better than 110dB differential mode rejection at 50Hz or 60Hz ±2%, or they can be driven by an external oscillator for a user-defined rejection frequency. The internal oscil- lator requires no external frequency setting components. The converters accept any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement configurations. The full- scale differential input range is from –0.5VREF to 0.5VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be indepen- dently set anywhere within GND to VCC. The DC common mode input rejection is better than 120dB. The LTC2430/LTC2431 communicate through a flexible 3-wire digital interface that is compatible with SPI and MICROWIRE TM protocols.

The LTC1877 is a high efficiency, low quiescent current, synchronized, burst mode synchronous buck regulator.

The LT1725 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a third transformer winding. These features allow for an application input voltage limited only by external power path components. The third transformer winding also provides output voltage feedback information, such that an optoisolator is not required. Its gate drive capability coupled with a suitable external MOSFET can deliver load power up to tens of watts. The LT1725 has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start.

The LT1424-5 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. The LT1424-5 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver up to 400mA at 5V with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. The LT1424-5 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode. Load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 20µA typical for standby operation.

LT1777 is a low noise step-down switching regulator designed by Linear Technology. It features programmable di/dt limit, internally limited dv/dt, high input voltage(48V), 700mA peak switch rating, true current mode control, 100kHz fixed operating frequency, synchronizable to 250kHz, low supply current in shutdown(30µA), low thermal resistance 16-pin SO package.

LTC1147-3.3 and LTC1147-5/LTC1147L are high-efficiency step-down switching regulator controllers with features such as wide input voltage range, high efficiency, low standby current, and short-circuit protection.

This document is about LT1766/LT1766-5, LT1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. It includes a high efficiency 1.5A, 0.2Ω switch, as well as all the necessary oscillator, control and logic circuitry. A current mode control architecture delivers fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. By using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch, efficiency is maintained over a wide output current range. Patented circuitry* maintains peak switch current rating.

LTC1091/LTC1092/LTC1093/LTC1094 is a 10-bit serial I/O data acquisition system with programmable unipolar/bipolar conversions, differential/single-ended multiplexer configurations, sample-and-holds, single supply 5V, 10V or ±5V operation, direct 3- or 4-wire interface to most MPU serial ports and all MPU parallel I/O ports, analog inputs common mode to supply rails, resolution: 10 bits, total unadjusted error (A Grade): ±1LSB over temp, fast conversion time: 20µs, low supply current LTC1091: 3.5mA Max, 1.5mA Typ LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ.