■ DESCRIPTION

The MB39A106 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 MB39A106 is suitable for down-conversion.

The MB39A106 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two anti-phase triangular waves) which contributes to making the input capacitor small.

The MB39A106 contains a Bootstrap diode resulting in a reduced number of components used. It also contains a variety of protection features which output the protection status upon detection of an overvoltage or overcurrent while reducing the number of external protective devices required.

The result is an ideal built-in power supply for driving products with high speed CPU’s such as home TV game devices and notebook PC’s.

■ FEATURES

• Built-in bootstrap diode

• Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)

• Built-in timer-latch overvoltage protection circuit

• Synchronous rectification system providing high efficiency

• Power supply voltage range: 6.5 V to 18 V

• PWRGOOD terminals (open-drain) to output the protection status

• Symmetrical-phase system reducing the input capacitor loss

• Built-in channel control function

• One type of package (TSSOP-30pin : 1 type)

• Reference voltage: 3.5 V ± 1

• Error amplifier threshold voltage: 1.23 V ± 1 (Ta = 0 °C to + 85 °C)

• Support for frequency setting using an external resistor (Frequency setting capacitor integrated)

• Oscillation frequency range: 100 kHz to 500 kHz

• Standby current : 0 µA (Typ)

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

• Built-in totem-pole output for N-ch MOS FET

• One type of package (TSSOP-30 pin : 1 type)

■ APPLICATION

• Home Video Game

• IP phone

• Printer etc.