■ DESCRIPTION

The MB39A112 is a 3-channel DC/DC converter IC using pulse width modulation (PWM) , and the MB39A112 is suitable for down-conversion.

3-channel is built in TSSOP-20P package. Each channel can be controlled and soft-start.

The MB39A112 contains a constant voltage bias circuit for output block, capable of implementing an efficient high-frequency DC/DC converter. It is ideal for built-in power supply such as ADSL modems.

■ REATURES

• Supports for down-conversion (CH1 to CH3)

• Power supply voltage range : 7 V to 25 V

• Error amplifier threshold voltage : 1.00 V ± 1% (CH1)

                                             : 1.23 V ± 1% (CH2, CH3)

• Oscillation frequency range : 250 kHz to 2.6 MHz

• Built-in soft-start circuit independent of loads

• Built-in timer-latch short-circuit protection circuit

• Built-in totem-pole type output for P-channel MOS FET devices

• Built-in constant voltage (VCCO − 5 V) bias circuit for output block