LTC4446High Voltage High Side/Low Side N-Channel MOSFET Driver | PMIC | 2 | Active | The LTC4446 is a high frequency high voltage gate driver that drives two N-channel MOSFETs in a DC/DC converter with supply voltages up to 100V. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitance. The LTC4446’s pull-up for the top gate driver has a peak output current of 2.5A and its pull-down has an output impedance of 1.2Ω. The pull-up for the bottom gate driver has a peak output current of 3A and the pull-down has an output impedance of 0.55Ω.The LTC4446 is configured for two supply-independent inputs. The high side input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 114V above ground.The LTC4446 contains undervoltage lockout circuits that disable the external MOSFETs when activated.The LTC4446 is available in the thermally enhanced 8-lead MSOP package.The LTC4446 does not have adaptive shoot-through protection. For similar drivers with adaptive shoot-through protection, please refer to the chart below.PARAMETERLTC4446LTC4444LTC4444-5Shoot-Through ProtectionNoYesYesAbsolute Max TS100V100V100VMOSFET Gate Drive7.2V to 13.5V7.2V to 13.5V4.5V to 13.5VVCC UV+6.6V6.6V4VVCC UV–6.15V6.15V3.5VApplicationsDistributed Power ArchitecturesAutomotive Power SuppliesHigh Density Power ModulesTelecommunication Systems |
| Integrated Circuits (ICs) | 1 | Obsolete | |
LTC4449High Speed Synchronous N-Channel MOSFET Driver | PMIC | 5 | Active | The LTC4449 is a high frequency gate driver that is designed to drive two N-Channel MOSFETs in a synchronous DC/DC converter. The powerful rail-to-rail driver capability reduces switching losses in MOSFETs with high gate capacitance.The LTC4449 features a separate supply for the input logic to match the signal swing of the controller IC. If the input signal is not being driven, the LTC4449 activates a shutdown mode that turns off both external MOSFETs. The input logic signal is internally level-shifted to the bootstrapped supply, which functions at up to 42V above ground.The LTC4449 contains undervoltage lockout circuits on both the driver and logic supplies that turn off the external MOSFETs when an undervoltage condition is present. An adaptive shoot-through protection feature is also built-in to prevent the power loss resulting from MOSFET cross-conduction current.The LTC4449 is available in the 2mm × 3mm DFN package.ApplicationsDistributed Power ArchitecturesHigh Density Power Modules |
| Evaluation and Demonstration Boards and Kits | 1 | Active | |
LTC4555SIM Power Supply and Level Translator | RF Misc ICs and Modules | 1 | Active | The LTC4555 provides power conversion and signal level shifting needed for low voltage 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all type approval requirements for 1.8V and 3V SIMs and smart cards. The part contains an LDO linear regulator to supply SIM power at either 1.8V or 3V from a 3V to 6V input. The output voltage is selected with a single pin and up to 50mA of load current can be supplied.Internal level translators allow controllers operating with supplies as low as 1.2V to interface with 1.8V or 3V smart cards. Battery life is maximized by 20µA operating current and <1µA shutdown current. Board area is minimized by the 3mm x 3mm leadless QFN package.ApplicationsSIM Interface in 3G Cellular TelephonesSmart Card Readers |
LTC4556Smart Card Interface with Serial Control | Specialized | 1 | Active | The LTC4556 provides all necessary power control, level translation and supervisory functions for a smart card or S.A.M. card interface. The part contains a low noise charge pump plus LDO for generating VCC power, as well as all necessary level shifting circuitry.The card voltage can be set to either 1.8V, 3V or 5V. The LTC4556 includes a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC4556 interfaces to a microcontroller via a simple 4‑wire serial interface. Multiple devices may be connected in daisy-chain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface.Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC4556 is available in a small, low profile (0.75mm), 4mm × 4mm QFN package.ApplicationsHandheld Payment TerminalsPay TelephonesATM MachinesPOS TerminalsComputer KeyboardsMultiple S.A.M. Sockets |
LTC4557Dual SIM/Smart Card Power Supply and Interface | RF Misc ICs and Modules | 1 | Active | The LTC4557 provides power conversion and signal level translation needed for 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all requirements for 1.8V and 3V SIMs. The part contains LDO regulators to power 1.8V or 3V SIM cards from a 2.7V to 5.5V input. The output voltages can be set using the two voltage selection pins and up to 50mA of load current can be supplied.Internal level translators allow controllers operating with supplies as low as 1.2V to interface with 1.8V or 3V smart cards. Battery life is maximized by a low operating current of less than 100µA and a shutdown current of less than 1µA. Board area is minimized by the low profile 3mm x 3mm x 0.75mm leadless QFN package.ApplicationsGSM and 3G Cellular PhonesWireless P.O.S. TerminalsMultiple SAM Card Interface |
LTC485Low Power RS485 Interface Transceiver | Interface | 2 | Active | The LTC485 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state.The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open.The LTC485 is fully specified over the commercial and extended industrial temperature range.ApplicationsLow Power RS485/RS422 TransceiverLevel Translator |
LTC486Quad Low Power RS485 Driver | Interface | 1 | Active | The LTC486 is a low power differential bus/line driver designed for multipoint data transmission standard RS485 applications with extended common-mode range (12V to –7V). It also meets RS422 requirements.The CMOS design offers significant power savings over its bipolar counterpart with out sacrificing ruggedness against overload or ESD damage.The driver features three-state outputs, with the driver outputs maintaining high impedance over the entire common-mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state.Both AC and DC specifications are guaranteed from 0°C to 70°C (Commercial), –40°C to 85°C (Industrial), over the 4.75V to 5.25V supply voltage range.ApplicationsLow Power RS485/RS422 DriversLevel Translator |
LTC487Quad Low Power RS485 Driver | Integrated Circuits (ICs) | 4 | Active | The LTC487 is a low power differential bus/line driver designed for multipoint data transmission standard RS485 applications with extended common mode range (–7V to 12V). It also meets RS422 requirements.The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.The driver features three-state outputs, with the driver outputs maintaining high impedance over the entire common mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state.Both AC and DC specifications are guaranteed from 0°C to 70°C (Commercial), –40°C to 85°C (Industrial) and over the 4.75V to 5.25V supply voltage range.ApplicationsLow Power RS485/RS422 DriversLevel Translator |
