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) system. 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. Features 1) The slave IC operates by receiving reference voltage and triangular waves from a BA9700-series regulator. 2) Contains error amplifier and PWM comparator ; the BA9701 is in an 8-pin dual-inline package, and the BA9701F is in an 8-pin SOP package. Block diagram Absolute maximum ratings (Ta = 25C) 274 3) Suited for multiple output power supply; superb cost performance in combination with BA9700A-series regulators. 4) Voltage output can step up, step down, or invert at an arbitrary level. Regulator ICs BA9701 / BA9701F Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 2.5V) Timing chart 275 Regulator ICs Application example 276 BA9701 / BA9701F Regulator ICs BA9701 / BA9701F Basic application board patterns and component arrangement External dimensions (Units: mm) 277