LTC1148High Efficiency Synchronous Step-Down Switching Regulators | Voltage Regulators - DC DC Switching Controllers | 9 | Active | The LTC1148 series is a family of synchronous stepdown switching regulator controllers featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture providing constant ripple current in the inductor.The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 18V (20V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON)of the external MOSFET and resistance of the inductor and current sense resistor.The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. Standby power is reduced to only 2mW at VIN= 10V (at IOUT= 0). Load currents in Burst Mode operation are typically 0mA to 300mA.For operation up to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54.ApplicationsNotebook and Palmtop ComputersPortable InstrumentsBattery-Operated Digital DevicesCellular TelephonesDC Power Distribution SystemsGPS Systems |
LTC1149High Efficiency Synchronous Step-Down Switching Regulators | DC DC Switching Controllers | 3 | Active | The LTC1149 series is a family of synchronous step down switching regulator controllers featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout to 48V (60V absolute max). The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor.The LTC1149 series incorporates automatic power saving Burst Modeoperation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN= 12V. In shutdown, both MOSFETs are turned off.ApplicationsNotebook and Palmtop ComputersPortable InstrumentsBattery-Operated Digital DevicesIndustrial Power DistributionAvionics SystemsTelecom Power Supplies |
LTC1150±15V Zero-Drift Operational Amplifier with Internal Capacitors | Linear | 2 | Active | The LTC1150 is a high-voltage, high-performance zero-drift operational amplifier. The two sample-and-hold capacitors usually required externally by other chopper amplifiers are integrated on-chip. Further, LTC’s proprietary high-voltage CMOS structures allow the LTC1150 to operate at up to 32V total supply voltage.The LTC1150 has an offset voltage of 0.5µV, drift of 0.01µV/°C, 0.1Hz to 10Hz input noise voltage of 1.8µVP-Pand a typical voltage gain of 180dB. The slew rate of 3V/µs and a gain bandwidth productof 2.5MHz are achieved with 0.8mA of supply current. Overload recovery times from positive and negative saturation conditions are 3ms and 20ms, respectively.For applications demanding low power consumption, Pin 1 can be used to program the supply current. Pin 5 is an optional AC-coupled clock input, useful for synchronization.The LTC1150 is available in standard 8-lead, plastic dual-in-line package, as well as an 8-lead SO package. The LTC1150 can be a plug-in replacement for most standard bipolar op amps with significant improvement in DC performance.ApplicationsStrain Gauge AmplifiersElectronic ScalesMedical InstrumentationThermocouple AmplifiersHigh Resolution Data Acquisition |
LTC1152Rail-to-Rail Input Rail-to-Rail Output Zero-Drift Op Amp | Amplifiers | 2 | Active | The LTC1152 is a high performance, low power zero-drift op amp featuring an input stage that common modes to both power supply rails and an output stage that provides rail-to-rail swing, even into heavy loads. The wide in put common-mode range is achieved with a high frequency on-board charge pump. This technique eliminates the crossover distortion and limited CMRR imposed by competing technologies. The LTC1152 is a C-Load™op amp, enabling it to drive any capacitive load.The LTC1152 shares the excellent DC performance specs of LTC’s other zero-drift amplifiers. Typical offset voltage is 1µVand typical off-set drift is 10nV/°C.CMRR and PSRR are 130dB and 120dB and open-loop gain is 130dB. Input noise voltage is 2µVP-Pfrom 0.1Hz to 10Hz. Gain-bandwidth product is 0.7MHz and slew rate is 0.5V/µs, all with product is 0.7MHz and slew rate is 0.5V/µs, all with supply current of 3.0mA max over temperature. The LTC1152 also includes a shutdown feature which drops supply current to 1µA and puts the output stage in a high impedance state.The LTC1152 is available in 8-pin PDIP and 8-pin SO packages and uses the standard op amp pin-out, allowing it to be a plug-in replacement for many standard op amps.ApplicationsRail-to-Rail Amplifiers and BuffersHigh Resolution Data Acquisition SystemsSupply Current Sensing in Either RailLow Supply Voltage Transducer AmplifiersHigh Accuracy InstrumentationSingle Negative Supply Operation |
LTC1153Auto-Reset Electronic Circuit Breaker | Power Management (PMIC) | 3 | Active | The LTC1153 electronic circuit breaker drives a low cost N-channel MOSFET to interrupt power to a sensitive electronic load in the event of an over-current condition. The breaker remains tripped for a period of time set by an external timing capacitor and then is automatically reset. This cycle continues until the over-current condition is removed, protecting both the sensitive load and the MOSFET switch.The trip current, trip delay time and auto-reset period are programmable over a wide range to accommodate a variety of load impedances. An active high shut down input is also provided and interfaces directly to a PTC thermistor for thermal circuit breaking. An open-drain output is provided to report breaker status to the µP.The LTC1153 is available in both 8-pin DIP and 8-pin SOIC packages.ApplicationsPower Bus Circuit BreakerSCSI Termination Power ProtectionRegulator Over-Current ProtectionBattery Short-Circuit ProtectionDC Motor Stall ProtectionSensitive System Power Interrupt |
LTC1154High-Side Micropower MOSFET Driver | Power Management (PMIC) | 3 | Active | The LTC1154 single high-side gate driver allows using low cost N-channel FETs for high-side switching applications. An internal charge pump boosts the gate drive voltage above the positive rail, fully enhancing an N-channel MOS switch with no external components. Micropower operation, with 8µA standby current and 85µA operating current, allows use in virtually all systems with maximum efficiency.Included on chip is programmable over-current sensing. A time delay can be added to prevent false triggering on high in-rush current loads. An active high shutdown input is also provided and interfaces directly to a standard PTC thermistor for thermal shutdown. An open-drain output is provided to report switch status to the µP. An active low enable input is provided to control multiple switches in banks.The LTC1154 is available in both 8-pin DIP and 8-pin SOIC packages.ApplicationsLaptop Computer Power SwitchingSCSI Termination Power SwitchingCellular Telephone Power ManagementBattery Charging and ManagementHigh-Side Industrial and Automotive SwitchingStepper Motor and DC Motor Control |
LTC1155Dual High Side Micropower MOSFET Driver | Integrated Circuits (ICs) | 2 | Active | The LTC1155 dual high side gate driver allows using low cost N-channel FETs for high side switching applications. An internal charge pump boosts the gate above the positive rail, fully enhancing an N-channel MOSFET with no external components. Micropower operation, with 8μA standby current and 85μA operating current, allows use in virtually all systems with maximum efficiency.Included on-chip is overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added in series with the current sense to prevent false triggering on high in-rush loads such as capacitors and incandescent lamps.The LTC1155 operates off of a 4.5V to 18V supply input and safely drives the gates of virtually all FETs. The LTC1155 is well suited for low voltage (battery-powered) applications, particularly where micropower "sleep" operation is required.The LTC1155 is available in both 8-pin PDIP and 8-pin SO packages.APPLICATIONSLaptop Power Bus SwitchingSCSI Termination Power SwitchingCellular Phone Power ManagementP-Channel Switch ReplacementRelay and Solenoid DriversLow Frequency Half H-BridgeMotor Speed and Torque Control |
LTC1156Quad High Side Micropower MOSFET Driver with Internal Charge Pump | PMIC | 2 | Active | The LTC1156 quad High side gate driver allows using low cost N-channel FETs for high side switching applications. An internal charge pump boosts the gate drive voltage above the positive rail, fully enhancing an N-channel MOS switch with no external components. Micropower operation, with 16µA standby current and 95µA operating current, allows use in virtually all systems with maximum efficiency.Included on chip is independent over-current sensing to provide automatic shutdown in case of short circuits. A time delay can be added to the current sense to prevent false triggering on high in-rush current loads.The LTC1156 operates off of a 4.5V to 18V supply and is well suited for battery-powered applications, particularly where micropower "sleep" operation is required.The LTC1156 is available in both 16-pin DIP and 16-pin SOL packages.ApplicationsLaptop Computer Power SwitchingSCSI Termination Power SwitchingCellular Telephone Power ManagementP-Channel Switch ReplacementBattery Charging and ManagementLow Frequency H-Bridge DriverStepper Motor and DC Motor Control |
LTC1159High Efficiency Synchronous Step-Down Switching Regulators | DC DC Switching Controllers | 4 | Active | The LTC1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300µA while still regulating the output and shutdown current is a low 20µA.ApplicationsStep-Down and Inverting RegulatorsNotebook and Palmtop ComputersPortable InstrumentsBattery-Operated Digital DevicesIndustrial Power DistributionAvionics SystemsTelecom Power Supplies |
LTC1163Triple 1.8V to 6V High-Side MOSFET Drivers | Gate Drivers | 1 | Active | The LTC1163/LTC1165 triple low voltage MOSFET drivers make it possible to switch supply or ground referenced loads hrough inexpensive, low RDS(ON)N-channel switches from as little as a 1.8V supply. The LTC1165 has inverting inputs and makes it possible to directly replace P-channel MOSFET switches while maintaining system drive polarity. The LTC1163 has noninverting inputs.Micropower operation, with 0.01µA standby current and 95µA operating current, coupled with a power supply range of 1.8V to 6V, make the LTC1163/LTC1165 ideally suited for 2- to 4-cell battery-powered applications. The LTC1163/LTC1165 are also well suited for sub-3V, 3.3V and 5V nominal supply applications.The LTC1163/LTC1165 internal charge pumps boost the gate voltage 8V above a 3.3V rail, fully enhancing inexpensive N-channels for high- or low-side switch applications.The LTC1163/LTC1165 are available in both an 8-pin DIP and an 8-pin SOIC.ApplicationsPCMCIA Card 3.3V/5V Switch2-Cell High-Side Load SwitchingBoost Regulator Shutdown to Zero Standby CurrentReplacing P-Channel SwitchesNotebook Computer Power ManagementPalmtop Computer Power ManagementPortable Medical EquipmentMixed 3.3V and 5V Supply Switching |
