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ST Microelectronics has introduced a new IC for cellphones and mobile devices that will help combat the environmental impact of large numbers of battery chargers discarded when their owners upgrade to newer equipment.
Organizations including the Chinese government and the GSM Association are proposing standard battery-charger connectors and voltages to allow universal chargers for mobile phones. These efforts are focusing on USB standards as a convenient.
The STBP120 chip protects the charging-control circuitry inside cellphones and other battery-powered portable equipment in case the external charger applies an excessive voltage. If the detected voltage exceeds a preset threshold, an internal solid-state switch is opened, thereby preventing the over-voltage from damaging the internal circuitry.
The STBP120 also monitors its own junction temperature and switches off the internal MOSFET if the junction temperature exceeds the specified limit.
The STBP120 device can be controlled by the microcontroller and can also provide status information about fault conditions.
Main features of the STBP120 chip are : input overvoltage protection up to 28 V , integrated high voltage N-channel MOSFET switch , lLow RDS(on) of 90 mΩ , Integrated charge pump , thermal shutdown protection , softstart feature to control the inrush current , enable input (EN) , fault indication output (FLT) , IN input ESD withstand voltage up to ±15 kV (air discharge) up to ±8 kV (contact discharge) in typical application circuit with 1μF input capacitor (±2 kV HBM for standalone device ) .
Linear Technology has introduced the LTC3858 step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages.
The LTC3858 uses a constant frequency, current mode step-down architecture with the two controller channels operating 180 degrees out of phase.
Main features of the LTC3858 step-down switching regulator are : Low Operating IQ: 170μA (One Channel On) , Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V , Wide VIN Range: 4V to 38V , RSENSE or DCR Current Sensing , Out-of-Phase Controllers Reduce Required Input , Capacitance and Power Supply Induced Noise , OPTI-LOOP® Compensation Minimizes COUT , Phase-Lockable Frequency (75kHz-850kHz) , Programmable Fixed Frequency (50kHz-900kHz) , Very Low Dropout Operation: 99% Duty Cycle , Adjustable Output Voltage Soft-Start , Power Good Output Voltage Monitor , Output Overvoltage Protection , Output Latch-Off Protection During Short Circuit , Low Shutdown IQ: 8μA , Internal LDO Powers Gate Drive from VIN or EXTVCC .
LTC3858 step down regulator controller can be used in applications like : automotive systems , battery operated digital devices ,distributed DC power systems and other .
Linear technology introduces the LTC6412 chip which is a fully differential variable gain amplifier with linear-in-dB analog gain control. LTC6412 is designed for AC-coupled operation in IF receiver chains from 1MHz to 500MHz.
The LTC6412 is ideal for interfacing with the LTC5527 and LT5557 down converting mixers, LTC6410-6 IF amplifier and the LTC6400/LTC6401/LTC6416 ADC drivers for use in 12-, 14-, and 16-bit ADC applications.
Main features of the LTC6412 are : 800MHz –3dB Small-Signal Bandwidth , Continuously-Adjustable Gain Control , -14dB to +17dB Linear-in-dB Gain Range , 35dBm OIP3 at 240MHz Across All Gain Settings , 10dB Noise Figure at Maximum Gain , (IIP3 – NF) = +8dBm at 240MHz Across All Gains , Differential Inputs and Outputs , 50Ω Input Impedance Across all Gains , Single Supply Operation from 3V to 3.6V , 110mA Supply Current.
A typical application circuit for the LTC6412 you can see in schematic diagram bellow.
