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LTC3620 low power synchronous buck regulator

The LTC3620 chip manufactured by Linear technology is a high efficiency synchronous buck regulator designed for very low power applications .

The LTC3620 buck regulator is internally programmed to provide a 1.1V output.

The LTC3620 uses a unique variable frequency architecture to minimize power loss .

The switching frequency of the LTC3620 is proportional to the load current .

The LTC3620 synchronous buck regulator can be used in electronics applications like : Wireless Headsets , Li-Ion Cell Applications , Button Cell Replacement .

The LTC3620 has a high efficiency up to 95% and a maximum output current of a 15mA  .

The input voltage range for the LTC3620 is from 2.9V to 5.5V .

Other main features of the LTC3620 high efficiency  synchronous buck regulator are  : Externally Programmable Frequency Clamp with Internal 50kHz Default Minimizes Audio Noise , 18μA IQ Current , Low-Battery Detection ,  0.6V Reference Allows Low Output Voltages ,  Shutdown Mode Draws <1μA Supply Current , 2.8V Undervoltage Lockout ,  Unique Low Noise Control Architecture , Internal Power MOSFETs , No Schottky Diodes Required .

LTC3620 synchronous buck regulator

LTM2881 fullduplex RS485/RS422

Linear Technology introduces the LTM2881 complete galvanically isolated fullduplex RS485/RS422 μModuleR transceiver. LTM2881 required no external components .

LTM2881 device is ideal for systems where themground loop is broken allowing for large common mode voltage variation. Maximum data rates are 20Mbps or 250kbps in slew limited mode.

A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V.

Other features of the LTM2881 transceiver are : Isolated RS485/RS422  Transceiver: 2500VRMS ,  Integrated Isolated DC/DC Converter: 1W, 62% Efficiency , No External Components Required , 20Mbps or Low EMI 250kbps Data Rate ,  High ESD: ±15kV HBM on Transceiver Interface , High Common Mode Transient Immunity: 30kV/μs , Integrated Selectable 120Ω Termination ,  3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation , 1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface , Common Mode Working Voltage: 560VPEAK ,Current Limited Drivers and Thermal Shutdown , Compatible with TIA/EIA-485-A Specification .

LTM2881 fullduplex RS485/RS422

TDF8551J audio power amplifier

NXP ( Philips Semiconductor ) release new audio power amplifier chip with a maximum output power delivered around 45 watts per 4 channels .
TDF8551J audio amplifier has a complementary quad audio power amplifier that uses BCDMOS
technology. TDF8551J audio amplifier chip contains four amplifiers configured in Bridge-Tied Load (BTL) to drive four speakers.
The I2C-bus of the TDF8551J audio amplifier enables diagnostic information for each amplifier .
The TDF8551J audio amplifier has six output voltage regulators and two power switches .
TDF8551J amplifier has many build in features like :I2C-bus control , can drive a 2 W load with a battery voltage of up to 16 V and a 4 W load with a battery voltage of up to 18 V , DC load detection: open, short and present , AC load (tweeter) detection , Programmable clip detect; 1 % or 3 % , programmable thermal protection pre-warning , independent short-circuit protection for each channel , selectable line driver (20 dB) and amplifier mode (26 dB) , loss-of-ground and open VP safe , short-circuit to ground to VP or across the load protection , low battery detection , I2C-bus control , six voltage regulators (microcontroller, display, audio processor, tuner, bus, mechanical digital and drive) , selectable output voltages for regulators 1, 4 and 5 , low dropout voltage PNP output stages , low noise for all regulators and many other .
TDF8551J audio amplifier require a power supply voltage around 14.4 volts and can be used with 2 ohms load or 4 ohms load for each channel .
TDF8551J-audio-amplifier circuit


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