Abstract: According to an embodiment, a client includes a street information collection unit for collecting street information near an arrangement place, a provision determination unit for determining whether the street information collected by the street information collection unit is information required to be provided to the server, and a first transmission unit for transmitting the street information, which is determined to be required to be provided by determination of the provision determination unit, to the server, with client identification information for identifying the client.

Abstract: According to an embodiment, a client includes a street information collection unit for collecting street information near an arrangement place, a provision determination unit for determining whether the street information collected by the street information collection unit is information required to be provided to the server, and a first transmission unit for transmitting the street information, which is determined to be required to be provided by determination of the provision determination unit, to the server, with client identification information for identifying the client.

Abstract: A switching regulator includes an inverter circuit and a size adjustment circuit. The inverter circuit converts an input voltage into an output voltage by a switching operation of a switch circuit. The size adjustment circuit controls an ON resistance of the switch circuit, depending on a power efficiency that is calculated from an input power dependent on the input voltage and an output power dependent on the output voltage.

Abstract: A switching regulator includes an inverter circuit and a size adjustment circuit. The inverter circuit converts an input voltage into an output voltage by a switching operation of a switch circuit. The size adjustment circuit controls an ON resistance of the switch circuit, depending on a power efficiency that is calculated from an input power dependent on the input voltage and an output power dependent on the output voltage.

Abstract: In a semiconductor integrated circuit for a DC—DC converter, an nMOS-type transistor Qn of a CMOS inverter 1c constituting a driver 1 is electrically floated from a substrate 12 through an n-type well region 11. Thus, the nMOS-type transistor Qn is electrically insulated from other transistors such as an npn-type transistor Q1 and an L-pnp-type transistor Q2 constituting a feedback control system 9 through the n-type well region 11. Stable operation is performed with a minute current without producing a malfunction caused by the influence of a parasitic current, even if the drain potential of an nMOS-type transistor is reduced to the ground potential or lower at the time of switching by a driver constituted from a CMOS inverter, to facilitate lower power consumption and higher efficiency, and also to eliminate a constraint on layout design of components.

Abstract: In a semiconductor integrated circuit for a DC-DC converter, an nMOS-type transistor Qn of a CMOS inverter 1c constituting a driver 1 is electrically floated from a substrate 12 through an n-type well region 11. Thus, the nMOS-type transistor Qn is electrically insulated from other transistors such as an npn-type transistor Q1 and an L-pnp-type transistor Q2 constituting a feedback control system 9 through the n-type well region 11. Stable operation is performed with a minute current without producing a malfunction caused by the influence of a parasitic current, even if the drain potential of an nMOS-type transistor is reduced to the ground potential or lower at the time of switching by a driver constituted from a CMOS inverter, to facilitate lower power consumption and higher efficiency, and also to eliminate a constraint on layout design of components.