MB39A126

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27248-1E ASSP for Power Supply Applications (Secondary battery) DC/DC Converter IC for Charging Li-ion Battery MB39A125/126 ■ DESCRIPTION MB39A125/126 is a DC/DC converter IC for charging Li-ion battery, which is suitable for down-conversion, and uses pulse width modulation (PWM) for controlling the output voltage and current independently. This IC integrates the build-in comparator for the voltage detection of the AC adapter, and selects the AC adapter or battery automatically for power supply to the system. Provides a wide range of power supply voltage, low standby current, and high efficiency, which makes them ideal as a built-in charging device in products such as notebook PC. ■ FEATURES High efficiency : 97% (MAX) Built-in two constant current control circuits Analog control of the charging current value (+INE1, +INE2 terminal) Built-in AC adapter voltage detection function (ACOK, XACOK terminal) (Continued) ■ PACKAGES 24-pin plastic SSOP 28-pin plastic QFN (FPT-24P-M03) (LCC-28P-M11) www.DataSheet4U.com www.DataSheet4U.com MB39A125/126 (Continued) External output voltage setting resistor : MB39A125 Built-in output voltage setting resistor : MB39A126 Built-in charge stop function at low VCC Output voltage setting accuracy : ± 0.74% (Ta = −10 °C to +85 °C) : MB39A125 : 12.6 V/16.8 V ± 0.8% (Ta = −10 °C to +85 °C) : MB39A126 Built-in high accuracy current detection amplifier (±5%) (At input voltage differen...