ASSP for Power Supply Applications

(DC/DC converter for DSC/camcorder)

■ DESCRIPTION

The MB39A108 is 5-channel DC/DC converter IC using pulse width modulation (PWM), and is suitable for up conversion, down conversion, and up/down conversion. The MB39A108 is built in 5 channels into TSSOP-38P/BCC-40P package and operates at 2 MHz maximum. Each channel can be controlled with soft-start.

The MB39A108 is suitable for power supply of high performance portable instruments such as DSC.

■ FEATURES

• Supports for down-conversion with synchronous rectification (CH1)

• Supports for down-conversion and up/down Zeta conversion (CH2, CH3)

• Supports for up-conversion and up/down Sepic conversion (CH4, CH5)

• Low voltage start-up (CH4, CH5) : 1.7 V

• Power supply voltage range : 2.5 V to 11 V

• Reference voltage : 2.0 V ± 1

• Error amplifier threshold voltage : 1.00 V ± 1 (CH1), 1.23 V ± 1 (CH2 to CH5)

• Oscillation frequency range : 200 kHz to 2.0 MHz

• Standby current : 0 µA (Typ)

• Built-in soft-start circuit independent of loads

• Built-in totem-pole type output for MOS FET

• Short-circuit detection capability by external signal ( − INS terminal)

• Two types of package (TSSOP-38 pin : 1 type, BCC-40 pin : 1 type)

■ APPLICATIONS

• Digital still camera (DSC)

• Digital video camera (DVC)

• Surveillance camera etc.