CHARGE AND DISCHARGE SIGNAL CIRCUIT AND DC-DC CONVERTER

PROBLEM TO BE SOLVED: To provide a charge and discharge signal circuit that allows for achieving a small-sized and high-efficiency DC-DC converter.SOLUTION: A charge and discharge signal circuit includes: a plurality of high-side transistors Mp1 to Mp3 connected in series between a high-potential side power supply Vdd and an output node LX; a plurality of low-side transistors Mn1 to Mn3 connected in series between a low-potential side power supply GND and the output node; a plurality of high-side drive circuits; a plurality of low-side drive circuits; and a drive signal generating circuit 31. The high-side drive circuits include high-side level shifters 44 to 46, rows of capacitors Ch1 to Ch3 and switch elements Dh1 to Dh3, and high-side drive sections Ip1 to Ip3; and the low-side drive circuits include low-side level shifters 41 to 43, rows of capacitors Cl1 to Cl3 and switch elements Dl1 to Dl3, and low-side drive sections In1 to In3. 【課題】小型で高効率のＤＣＤＣコンバータを実現する充放電信号回路の提供。【解決手段】高電位側電源Vddと出力ノードLX間に直列に接続された複数のハイサイド側トランジスタMp1-Mp3と、低電位側電源GNDと出力ノード間に直列に接続された複数のローサイド側トランジスタMn1-Mn3と、複数のハイサイド側駆動回路と、複数のローサイド側駆動回路と、駆動信号生成回路31と、を有し、各ハイサイド側駆動回路は、ハイサイドレベルシフタ44-46と、容量Ch1-Ch3とスイッチ素子Dh1-Dh3の列と、ハイサイド駆動部Ip1-Ip3と、を有し、各ローサイド側駆動回路は、ローサイドレベルシフタ41-43と、容量Cl1-Cl3とスイッチ素子Dl1-Dl3の列と、ローサイド駆動部In1-In3と、を有する充放電信号回路。【選択図】図７