■ DESCRIPTION

The MB3886 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation (PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage protection circuit. Providing high output driving capabilities, the MB3886 is suitable for down-conversion.

The MB3886 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two anti-phase triangular waves) which contributes to making the input capacitor small.

■ FEATURES

• Overcurrent protection circuit (requiring no current sense resistor) and overvoltage protection circuit

• Power-supply voltage range : 5.5 V to 18 V

• Synchronous rectification system providing high efficiency

• PSIG pins (open-drain) to output the protection status

• Symmetrical-phase system reducing the input capacitor loss

• Built-in channel control function

• Reference voltage : 3.5 V ± 1

• Error amplifier threshold voltage : 1.25 V ± 1 (0 °C to 85 °C)

• Oscillator frequency range : 10 kHz to 500 kHz

• Built-in circuit for load-independent soft-start and discharge control

• Totem-pole type output for N-ch MOSFET