View ba9701 datasheet:

Regulator ICs Switching regulator for DC / DC converters BA9701 / BA9701F The BA9701 and BA9701F are DC / DC converter switching regulators that use a pulse width modulation (PWM) sys- tem. With an error amplifier, PWM comparator, and output driver, the ICs operate by receiving reference voltage and triangular wave oscillation from the BA9700A-series regulator. FFeatures 1) The slave IC operates by receiving reference voltage 3) Suited for multiple output power supply; superb cost and triangular waves from a BA9700-series regula- performance in combination with BA9700A-series tor. regulators. 2) Contains error amplifier and PWM comparator ; the 4) Voltage output can step up, step down, or invert at an BA9701 is in an 8-pin dual-inline package, and the arbitrary level. BA9701F