MB3888

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27710-2E ASSP For Power Supply Applications (Secondary battery) DC/DC Converter IC for Charging Li-ion Battery MB3888 s DESCRIPTION The MB3888 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells. The MB3888 provides a broad power supply voltage range and low standby current as well as high efficiency, making it ideal for use as a built-in charging device in products such as notebook PC. This product is covered by US Patent Number 6,147,477. s FEATURES Output voltage setting using external resistor : 1 cell to 4 cells High efficiency : 96% (VIN = 19 V, Vo = 16.8 V) Wide range of operating supply voltages : 8 V to 25 V Output voltage setting accuracy : 5 V ± 0.74% (Ta = −10 °C to 85 °C) Charging current accuracy : ±5% (Continued) s PACKAGE 20-pin plastic SSOP (FPT-20P-M03) MB3888 (Continued) Built-in frequency setting capacitor enables frequency setting using external resistor only Oscillation frequency range : 100 kHz to 500 kHz Built-in current detection amplifier with wide in-phase input voltage range : 0 V to VCC In standby mode, leave output voltage setting resistor open to prevent inefficient current loss Built-in standby current function : 0 µA (standard) Built-in soft-start function independent of loads Built-in totem-pole output stage supporting P-channel MOS FETs devices 2 MB3...