| PMIC | 4 | Active | |
| Voltage Regulators - DC DC Switching Regulators | 4 | Active | |
| Power Management (PMIC) | 4 | Active | |
LT1920Single Resistor Gain Programmable, Precision Instrumentation Amplifier | Integrated Circuits (ICs) | 4 | Active | The LT1920 is a low power, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. The low voltage noise of 7.5nV/√Hz(at 1kHz) is not compromised by low power dissipation (0.9mA typical for ±2.3V to ±15V supplies).The high accuracy of 30ppm maximum nonlinearity and 0.3% max gain error (G = 10) is not degraded even for load resistors as low as 2k (previous monolithic instrumentation amps used 10k for their nonlinearity specifications). The LT1920 is laser trimmed for very low input offset voltage (125µV max), drift (1µV/°C), high CMRR (75dB, G = 1) and PSRR (80dB, G = 1). Low input bias currents of 2nA max are achieved with the use of superbeta processing. The output can handle capacitive loads up to 1000pF in any gain configuration while the inputs are ESD protected up to 13kV (human body). The LT1920 with two external 5k resistors passes the IEC 1000-4-2 level 4 specification.The LT1920, offered in 8-pin PDIP and SO packages, is a pin for pin and spec for spec improved replacement for the AD620. The LT1920 is the most cost effective solution for precision instrumentation amplifier applications. For even better guaranteed performance, see the LT1167.ApplicationsBridge AmplifiersStrain Gauge AmplifiersThermocouple AmplifiersDifferential to Single-Ended ConvertersMedical Instrumentation |
LT19301A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT | Voltage Regulators - DC DC Switching Regulators | 4 | Active | The LT1930 and LT1930A are the industry's highest power SOT-23 switching regulators. Both include an internal 1A, 36V switch allowing high current outputs to be generated in a small footprint. The LT1930 switches at 1.2MHz, allowing the use of tiny, low cost and low height capacitors and inductors. The faster LT1930A switches at 2.2MHz, enabling further reductions in inductor size. Complete regulator solutions approaching one tenth of a square inch in area are achievable with these devices. Multiple output power supplies can now use a separate regulator for each output voltage, replacing cumbersome quasi-regulated approaches using a single regulator and custom transformers.A constant frequency internally compensated current mode PWM architecture results in low, predictable output noise that is easy to filter. Low ESR ceramic capacitors can be used at the output, further reducing noise to the millivolt level. The high voltage switch on the LT1930/LT1930A is rated at 36V, making the device ideal for boost converters up to 34V as well as for single-ended primary inductance converter (SEPIC) and flyback designs. The LT1930 can generate 5V at up to 480mA from a 3.3V supply or 5V at 300mA from four alkaline cells in a SEPIC design.The LT1930/LT1930A are available in the 5-lead ThinSOT package.ApplicationsTFT-LCD Bias SupplyDigital CamerasCordless PhonesBattery BackupMedical Diagnostic EquipmentLocal 5V or 12V SupplyExternal ModemsPC CardsxDSL Power Supply |
LT19311.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT | PMIC | 11 | Active | The LT1931/LT1931A are the industry’s highest power inverting SOT-23 current mode DC/DC converters. Both parts include a 1A integrated switch allowing high current outputs to be generated in a small footprint. The LT1931 switches at 1.2MHz while the LT1931A switches at 2.2MHz. These high speeds enable the use of tiny, low cost capacitors and inductors 2mm or less in height. The LT1931 is capable of generating –5V at 350mA or –12V at 150mA from a 5V supply, while the LT1931A can generate –5V at 300mA using significantly smaller inductors. Both parts are easy pin-for-pin upgrades for higher power LT1611 applications.The LT1931/LT1931A operate in a dual inductor inverting topology that filters both the input side and output side current. Very low output voltage ripple approaching 1mVP-Pcan be achieved when ceramic output capacitors are used. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. The low impedance output remains within 1% of nominal during large load steps. The 36V switch allows VINto VOUTdifferential of up to 34V.The LT1931/LT1931A are available in the 5-lead ThinSOT package.ApplicationsDisk Drive MR Head BiasDigital Camera CCD BiasLCD BiasGaAs FET BiasLocal Low Noise/Low Impedance Negative Supply |
LT1932Constant-Current DC/DC LED Driver in ThinSOT | LED Drivers | 2 | Active | The LT1932 is a fixed frequency step-up DC/DC converter designed to operate as a constant-current source. Because it directly regulates output current, the LT1932 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals.With an input voltage range of 1V to 10V, the device works from a variety of input sources. The LT1932 accurately regulates LED current even when the input voltage is higher than the LED voltage, greatly simplifying battery-powered designs. A single external resistor sets LED current between 5mA and 40mA, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. When the LT1932 is placed in shutdown, the LEDs are disconnected from the output, ensuring a quiescent current of under 1µA for the entire circuit. The device’s 1.2MHz switching frequency permits the use of tiny, low profile chip inductors and capacitors to minimize footprint and cost in space-conscious portable applications.ApplicationsCellular TelephonesHandheld ComputersDigital CamerasPortable MP3 PlayersPagers |
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LT1934Micropower Step-Down Switching Regulators in ThinSOT | Integrated Circuits (ICs) | 16 | Active | The LT1934 is a micropower step-down DC/DC converter with internal 400mA power switch, packaged in a low profile (1mm) ThinSOT. With its wide input range of 3.2V to 34V, the LT1934 can regulate a wide variety of power sources, from 4-cell alkaline batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Quiescent current is just 12µA and a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Burst Mode®operation and the low drop internal power switch result in high efficiency over a broad range of load current.The LT1934 provides up to 300mA of output current. The LT1934-1 has a lower current limit, allowing optimum choice of external components when the required output current is less than 60mA. Fast current limiting protects the LT1934 and external components against shorted outputs, even at 34V input.ApplicationsWall Transformer RegulationAutomotive Battery RegulationStandby Power for Portable ProductsDistributed Supply RegulationIndustrial Control Supplies |
LT19351.2MHz Boost DC/DC Converter in ThinSOT with 2A Switch | Voltage Regulators - DC DC Switching Regulators | 2 | Active | The LT1935 is the industry’s highest power SOT-23 switching regulator. Its unprecedented 2A, 40V internal switch allows high output currents to be generated in a small footprint. Intended for space-conscious applications, the LT1935 switches at 1.2MHz, allowing the use of tiny, low profile inductors and capacitors 2mm or less in height. The NPN switch achieves a VCESATof just 180mV at 2A independent of supply voltage, resulting in high efficiency even at maximum power levels from a 3V input.A constant frequency, internally compensated, current mode PWM architecture results in low, predictable output noise that is easy to filter. Low ESR ceramic capacitors can be used on the output, further reducing noise to the millivolt level. The high voltage switch on the LT1935 is rated at 40V, making the device ideal for boost converters up to 38V as well as for single-ended primary inductance converter (SEPIC) and flyback designs. The device can generate 5V at up to 1A from a 3.3V supply or 5V at 550mA from four alkaline cells in a SEPIC design.The LT1935 is available in a 5-lead SOT-23 package.ApplicationsDigital CamerasBattery BackupLCD BiasLocal 5V or 12V SupplyPC CardsxDSL Power SupplyTFT-LCD Bias Supply |
