Analog Devices Inc./Maxim Integrated

The LTC4419 is a dual input monolithic PowerPath™prioritizer with low operating current, that provides backup switchover for keeping critical circuitry alive during brown out and power loss conditions. Unlike diode-OR products, little current is drawn from the inactive supply even if its voltage is greater than the active supply.Internal 2Ω, current limited PMOS switches provide power path selection from a primary input (V1) or a backup input (V2) to the output. An adjustable voltage monitor set via an external resistive divider provides flexibility in setting the V1 to V2 switchover threshold. When primary input V1 drops, the ADJ monitor input causes OUT to be switched to V2. Fast non-overlap switchover circuitry prevents both reverse and cross conduction while minimizing output droop.The LTC4419 has two auxiliary comparators with open-drain outputs that provide flexible voltage monitoring. The V2ON output indicates if V2 is powering OUT. Freshness seal mode prevents V2 battery discharge during storage or shipment.ApplicationsLow Power Battery BackupPortable EquipmentPoint-of-Sale (POS) Equipment

The LTC4420 is a dual input monolithic PowerPath™prioritizer, with low operating current, that provides backup switchover for keeping critical circuitry alive during brownout and power loss conditions. Unlike diode-OR products, little current is drawn from the inactive supply even if its voltage is greater than the active supply.Internal 2Ω, current limited PMOS switches provide power path selection from a primary input (V1) or a backup input (V2) to the output. Two adjustable voltage monitors set via external resistive dividers provide flexibility in setting V1 to V2 switchover and V2 undervoltage thresholds. V1 is monitored continuously while V2 supply monitoring includes controllable low duty cycle UV monitoring. When primary input V1 drops, the ADJ monitor causes OUT to be switched to V2. When V2 drops, it is disconnected from OUT ifV2DISis low. Fast non-overlap switchover circuitry prevents reverse and cross conduction while minimizing output droop.Auxiliary voltage monitor CMP1 provides flexible voltage monitoring and output V2OK provides V2 undervoltage status. Freshness seal mode prevents V2 battery discharge during storage or shipment.ApplicationsLow Power Battery BackupPortable EquipmentPoint-of-Sale (POS) Equipment

The LTC4440-5 is a high frequency high side N-channel MOSFET gate driver that is designed to operate in applications with VINvoltages up to 60V. The LTC4440-5 can also withstand and continue to function during 80V VINtransients. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitances. The LTC4440-5’s pull-up has a peak output current of 1.1A and its pull-down has an output impedance of 1.85Ω.The LTC4440-5 features supply independent TTL/CMOS compatible input thresholds with 350mV of hysteresis. The input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 95V above ground.The LTC4440-5 is optimized for driving (5V) logic level FETs and contains an undervoltage lockout circuit that disables the external MOSFET when activated.The LTC4440-5 is available in the low profile (1mm) SOT-23 or a thermally enhanced 8-lead MSOP package.ParameterLTC4440-5LTC4440A-5LTC4440Max Operating TS60V80V80VAbssolute Max TS80V100V100VMOSFET Gate Drive4V to 15V4V to 15V8V to 15VVCC UV+3.2V3.2V6.3VVCC UV-3.04V3.04V6.0VApplicationsTelecommunications Power SystemsDistributed Power ArchitecturesServer Power SuppliesHigh Density Power ModulesGeneral Purpose Low-Side Driver