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

PIC18F87J90-LCD PIC® Microcontroller

Microchip Technology release PIC18F87J90 Family: Memory Extension for 8-bit LCD PIC® Microcontrollers .

MAX8844Y-MAX8844Z lithium ion charger

Maxim release new chips : MAX8844Z MAX8844Y which are designed for charging a single cell lithium-ion battery .
The MAX8844Z/MAX8844Y integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking Schottky diode to create the simplest and smallest charging solutions for handheld equipment.
The MAX8844Z/MAX8844Y automatically select between the USB or IN power source but if are both power sources connected the highest priority is for IN power source to ensure the shortest charging time for the system .
The MAX8844Z/MAX8844Y accept an input voltages supply range from 4.25V to 28V (IN and USB), but the charging is disabled if the input voltage exceeds +7.5V for protection against unqualified or faulty AC adapters.
These ICs can be used in applications like : Bluetooth Equipment , Cellular and Cordless Phones Charging Cradles and Docks, Digital Still Cameras , MP3 Players Smart Phones and PDAs , USB Appliances .
Main features of MAX8844Z MAX8844Y are : CCCV, Thermally Regulated Linear One-Cell Li+ Battery Charger ; No External MOSFET, Reverse Blocking Diode, or Current-Sense Resistor ; Programmable Fast-Charge Currents (1ARMS max) ; Programmable Top-Off Current Threshold ; Input Overvoltage Protected 4.7V Output (SAFEOUT) from IN ; Input Overvoltage Protected 4.7V Output (SAFEUSB) from USB ; Proprietary Die Temperature Regulation Control (+115°C) ; 4.25V to 28V Input Voltage Range with Input Overvoltage Protection Above +7.5V ; Low-Dropout Voltage (300mV at 500mA) ; Input Power-Source Detection Output (Active-Low POK), Charge Status Output (Active-Low CHG), Charge-Enable Input (Active-Low EN) ; Output for Autobooting (ABO, MAX8844Z) ; Output for Autobooting (Active-Low ABO, MAX8844Y)
MAX8844Y-MAX8844Z charger circuit schematic


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