MB39A134

FUJITSU MICROELECTRONICS DATA SHEET DS04-27264-2E ASSP for Power Management Applications (Rechargeable Battery) DC/DC converter IC for Charging Li-ion battery MB39A134 ■ DESCRIPTION The MB39A134 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 charge voltage and current independently. MB39A134 has a A C adapter detection compar ator i ndependent of the DC/DC con verter controller, and can control the source of po wer supply to a system. It suppor ts a wide input v oltage r ange, enables lo w current consumption in standby mode, and can control the charge voltage and charge current with high precision, which is perfect for the built-in Li-ion battery charger used in devices such as notebook PC. ■ FEATURES Support 2, 3 and 4 Cell Battery Pack Built-in two constant current control loops Built-in AC adapter detection function (ACOK pin) Charge voltage accuracy : ±0.7% (Ta = −10 °C to +85 °C) Built-in charging voltage control without external setting resistor (4.20 V/Cell or 4.10 V/Cell) Adjustable to charge voltage with external resistor Built-in two high accurate current detection amplifiers (±1%) (At input voltage difference 100 mV) (±5%) (At input voltage difference 20 mV) Input offset voltage : 0 mV (Current Amp1) : +3 mV (Current Amp2) Built-in Charging Current Control without external resistor (RS = 20 mΩ : 2.85 A) Adjustable charging current with external r...