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Blog blog, news from technology , fresh release technologies and components , interesting devices and many useful electronic circuits and schematics diagrams .

MAX5965A MAX5965B controllers

Maxim Semiconductor introduced new controllers designed for use in network equipment .The MAX5965A/MAX5965B are quad, monolithic, -48V power controllers designed for use in IEEE® 802.3af-compliant/pre-IEEE 802.3at-compatible power-sourcing equipment (PSE). The MAX5965A/MAX5965B are pin compatible with the MAX5952/MAX5945/LTC4258/LTC4259A PSE controllers and provide additional features.
The MAX5965A/MAX5965B feature a high-power mode that provides up to 45W per port. The MAX5965A/MAX5965B provide input undervoltage lockout (UVLO), input undervoltage detection, a loadstability safety check during detection, input overvoltage lockout, overtemperature detection, output voltage slew-rate limit during startup, power-good status, and fault status.
Other features of the MAX5965A/MAX5965B chips are : IEEE 802.3af Compliant/Pre-IEEE 802.3at Compatible , Instantaneous Readout of Port Current Through I2C Interface , High-Power Mode Enables Up to 45W Per Port , High-Capacitance Detection for Legacy Devices , Pin Compatible with MAX5952/MAX5945/LTC4258/LTC4259A , Four Independent Power-Switch Controllers , PD Detection and Classification , Load-Stability Safety Check During Detection , I2C-Compatible , 3-Wire Serial Interface , Current Foldback and Duty-Cycle-Controlled Current Limit , Direct Fast Shutdown Control Capability , Special Class 5 Classification
MAX5965A MAX5965B controllers

LTC3857-1 step-down switching regulator controller

The LTC3857-1 introduced by Linear Technology is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages.
LTC3857-1 is manufactured to design applications like :automotive always-On systems , Battery Operated Digital Devices , Distributed DC Power Systems .
LTC3857-1 support a wide input voltage range between 4 volts to 38 volts and give an output voltage between 0.8V and 24V .
A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.
Independent TRACK/SS pins for each controller ramp the output voltages during start-up. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.
The design of the circuit required few external components and is very simple .
The main features of the LTC3857-1 switching regulator controller are : Low Operating IQ: 50μA , Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V , Wide VIN Range: 4V to 38V , RSENSE or DCR Current Sensing , OPTI-LOOP® Compensation Minimizes COUT , Phase-Lockable Frequency (75kHz-850kHz) , Programmable Fixed Frequency (50kHz-900kHz) , Burst Mode® Operation at Light Loads , Very Low Dropout Operation: 99% Duty Cycle , Adjustable Output Voltage Soft-Start or Tracking , Power Good Output Voltage Monitor , Output Overvoltage Protection , Low Shutdown IQ: LTC3857-1 step-down switching regulator controller

LPV521 nanopower operational amplifier

LPV521 nanopower operational amplifier is designed for ultra long life battery applications and operates from 1.6V to 5.5V . Low power consumption make th LPV521 nanopower operational amplifier well suited for RFID readers and remote sensor nanopower applications .The LPV521 has a carefully designed CMOS input stage that outperforms competitors with typically 40 fA IBIAS currents which significantly reduces IBIAS and IOS errors introduced in megohm resistance, high impedance photodiode, and charge sense situations.
LPV521 nanopower operational amplifier designed by National Semiconductor can be used with success in applications like : wireless remote sensors , Powerline monitoring , Power meters , Battery powered industrial sensors , Micropower oxygen sensor and gas sensor , Active RFID readers , Zigbee based sensors for HVAC control , Sensor network powered by energy scavenging .
Maaain features of the LPV521 nanopower operational amplifier are : supply current VCM = 0.3V (max) 400 nA , operating voltage range 1.6V to 5.5V , low TCVOS (max) 3.5 μV/°C (max) , VOS (max) 1 mV (max) , Input bias current 40 fA , PSRR 109 dB , CMRR 102 dB , Open loop gain 132 dB , Gain bandwidth product 6.2 kHz ,slew rate 2.4 V/ms , Input voltage noise, f = 100 Hz 255 nV/√Hz.
LPV521 nanopower operational amplifier


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