■DESCRIPTION
The FUJITSU MB3813A/33A/43 is a pulse width modulation (PWM) DC/DC converter IC with independent outputvoltage and current setting capability.
The use of on-chip output setting resistance enables high precision output voltage control. Also, an output voltage switching feature for use with either graphite-electrode or coke-electrode lithium-ion batteries makes this IC ideal for internal battery chargers in notebook personal computers and similar applications.

■FEATURES
• Output setting resistance is on-chip for high precision output voltage: ±1.0%
• SEL pin enables output voltage selection
• High precision reference voltage source: 2.5 V ±1.0%
• High frequency operating capability: max. 500 kHz
• On-chip current detector amplifier with wide in-phase input voltage range: 0 V to VCC
• On-chip standby function
• On-chip input voltage detector circuit
• On-chip soft start control circuit
• On-chip output overshoot protection circuit for rapid load changes
• On-chip totem-pole output circuits for P-ch. MOS FET devices