Abstract: An electronic device comprises a semiconductor chip, an accommodating part that accommodates the semiconductor chip, a plurality of terminals that are provided along a first side of a first surface and along a second side opposite to the first side with respect to the semiconductor chip, the plurality of terminals being electrically connected to the semiconductor chip and being exposed on the rectangular first surface of the accommodating part, and a plurality of conductive members that penetrate from the first surface of the accommodating part to the second surface opposite to the first surface.

Abstract: A switching power supply circuit, which keeps an output voltage constant highly accurately by a buck-boost action, is provided. The switching power supply circuit comprises: a switching circuit formed by combining four switching elements with a coil in the shape of H; a coil current emulation circuit for generating an output voltage VC similar to a coil current; and a control circuit which, based on a feedback voltage representing an output voltage VO of the switching circuit, and the output voltage VC, performs on-off control of the switching circuit. The coil current emulation circuit has a CR integration circuit to generate the output voltage VC similar to the coil current. One of three voltages is applied to one terminal of the CR integration circuit, while a voltage proportional to the output voltage VO is applied to the other terminal of the CR integration circuit.

Abstract: A switching power supply circuit preventing coil current reversal, while minimizing a current consumption and speeding up a switching frequency is provided. The switching power supply circuit under a synchronous rectification system compares a feedback voltage and a reference voltage by a comparator and, based on the results of the comparison, alternately turns on and off a main switching element and a subordinate switching element to convert a direct current input voltage into a direct current output voltage. The circuit includes: an on-time generation circuit which, based on the input voltage and the output voltage, defines the on-times of the main switching element and the subordinate switching element; and a switching signal generation unit which, based on the output signals of the comparator and the on-time generation circuit, generates switching signals for controlling the on/off operation of the main switching element and the subordinate switching element.

Abstract: To increase a current that can be supplied to an electronic element mounted on an upper surface of a semiconductor package. An electronic device includes a semiconductor chip, a package that accommodates the semiconductor chip, a plurality of terminals that is electrically bonded with the semiconductor chip and is exposed on a first surface of the package, and at least one copper post that penetrates from the first surface of the package to a second surface opposite to the first surface, and that has a cross sectional area in the direction of the first surface, which is larger than the area of the plurality of terminals on the first surface.

Abstract: In a reference voltage generation circuit, a reference voltage generation unit 1 is configured to receive, as feedback, a voltage of an output terminal 3; a startup circuit unit 2 has a depletion MOS transistor TR1, and enhancement MOS transistors TR2, TR3; the MOS transistor TR1 has one end connected to a power source 4 and is formed as a constant current connection; the MOS transistor TR2 has one end connected to the power source 4 via a resistor RST, has an opposite end connected to the output terminal 3, and further has a gate connected to an opposite end of the MOS transistor TR1; and the MOS transistor TR3 has one end connected to the opposite end of the MOS transistor TR1, has an opposite end grounded, and further has a gate connected to the output terminal 3. The reference voltage generation circuit can reduce the occurrence of a wasteful current consumption after circuit startup.

Abstract: A switching power supply circuit includes: an error amplifier for amplifying a deviation between a reference voltage and a feedback voltage; a comparator for comparing the reference voltage with an output voltage of the error amplifier, and outputting a predetermined set signal; an ON-time control circuit for defining a period during which a switching element is ON; a flip-flop circuit which is set by the set signal to bring the switching element into an ON- or OFF-state, and is reset by an output signal of the ON-time control circuit to bring the switching element into an OFF- or ON-state; a ripple voltage detection circuit for connecting an integration circuit in parallel to an inductance coil, thereby detecting a ripple voltage contained in the output voltage; and a capacitor connected between the output side of the error amplifier and a junction of a resistor and a capacitor of the integration circuit.

Abstract: Each of a plurality of reference voltage sources having different temperature characteristics has a reference voltage generation unit which generates a predetermined reference voltage having intrinsic temperature characteristics showing a peak voltage at different temperatures, an amplification circuit which compares the reference voltage and a feedback voltage to control an output transistor, the output transistor which generates a reference output voltage at an output terminal, and a voltage regulation unit which is able to regulate an output voltage so as to become the reference output voltage and generates the feedback voltage. A maximum reference output voltage which is the maximum of the reference output voltages is output through the output terminal.

Abstract: A switching power supply circuit comprises: a differential amplification stage for outputting an error signal representing a difference voltage between a preset reference voltage and a voltage based on an output voltage; an ON-time generation circuit for defining a period of time during which a main switching element is kept ON; a flip-flop circuit which is set by a set signal based on the error signal and reset by a reset signal being an output of the ON-time generation circuit; current information means for detecting current information representing a current flowing to a subordinate switching element; current information detecting means for supplying a current information detecting signal, which makes an adjustment based on the current information so as to delay the timing of the rise of the set signal, to the output side or the interior of the differential amplification stage; and current information holding means for holding the current information detected by the current information means at a moment wh

Abstract: A switching power supply circuit includes: a comparator for comparing a reference voltage, which is an output signal of a reference voltage generation circuit, with a feedback voltage, and outputting a set signal when a difference between the reference voltage and the feedback voltage exceeds a predetermined threshold value; an ON-time generation circuit for generating an ON-time signal for defining a period of time during which a switching element is kept ON; and a flip-flop circuit which turns on or off the switching element by the set signal and turns off or on the switching element by the ON-time signal. The reference voltage generation circuit has a first reference power supply for generating a first reference voltage, a second reference power supply for generating a second reference voltage, a capacitor, a resistor, and switch means.

Abstract: A covered acceleration sensor element includes a support frame portion surrounding a weight portion, a plurality of flexible beam portions for connecting the weight portion to the support frame portion, and piezoresistance elements provided on the beam portions. An upper cover and a lower cover enclosing the periphery of the weight portion together with the support frame portion are joined to the face and back of the support frame portion. The support frame portion is separated by separation grooves into an inner frame and an outer frame. The plurality of inner frame support portions has flexibility. The beam portions are connected to both sides of the weight portion along the second axis and the third axis. The inner frame support portions are connected to both sides of the inner frame in a direction in which they are rotated nearly 45 degrees from the second axis and the third axis.

Abstract: A step-up switching power supply circuit is provided. Within a delay period immediately after start of operation, a switching element (SW2) is subjected to constant-current control by a switching control signal (E) of a constant-current source buffer circuit (9). Control is also effected such that during halt of control for a stepping-up action in this circuit, or within the delay period, when an output voltage (VOUT)<an input voltage (VIN), a switching element (SW3) is brought into the ON state, and simultaneously, a switching element (SW4) is brought into the OFF state, or when VOUT>VIN, the switching element (SW3) is brought into the OFF state, and simultaneously, the switching element (SW4) is brought into the ON state, and after a lapse of the delay period, the switching element (SW3) is in the OFF state, and the switching element (SW4) is in the ON state, no matter which of the output voltage (VOUT) and the input voltage (VIN) is higher when compared by a comparator (12).

Abstract: A switching power supply circuit comprises: a comparator for comparing a reference voltage, which is an output signal of a reference voltage generation circuit, with a feedback voltage, and outputting a set signal when a difference between the reference voltage and the feedback voltage exceeds a predetermined threshold value; an ON-time generation circuit for generating an ON-time signal for defining a period of time during which a switching element is kept ON; and a flip-flop circuit which turns on or off the switching element by the set signal and turns off or on the switching element by the ON-time signal.

Abstract: A switching power supply circuit comprises: a differential amplification stage for outputting an error signal representing a difference voltage between a preset reference voltage and a voltage based on an output voltage; an ON-time generation circuit for defining a period of time during which a main switching element is kept ON; a flip-flop circuit which is set by a set signal based on the error signal and reset by a reset signal being an output of the ON-time generation circuit; current information means for detecting current information representing a current flowing to a subordinate switching element; current information detecting means for supplying a current information detecting signal, which makes an adjustment based on the current information so as to delay the timing of the rise of the set signal, to the output side or the interior of the differential amplification stage; and current information holding means for holding the current information detected by the current information means at a moment wh

Abstract: A covered acceleration sensor element includes a weight portion, a support frame portion surrounding the weight portion, a plurality of flexible beam portions for connecting the weight portion to the support frame portion to support the weight portion, piezoresistance elements provided on the beam portions, and wirings for connecting them. An upper cover and a lower cover enclosing the periphery of the weight portion together with the support frame portion are joined to the face and back of the support frame portion. Acceleration in the directions of three axes, i.e., a first axis in the joining thickness direction, a second axis in a plane perpendicular to the first axis, and a third axis in the plane and perpendicular to the second axis, or acceleration in the direction of any of the axes, is detected from changes in the resistances of the piezoresistance elements. The support frame portion is separated by separation grooves into an inner frame and an outer frame.

Abstract: A step-up switching power supply circuit is provided. Within a delay period immediately after start of operation, a switching element (SW2) is subjected to constant-current control by a switching control signal (E) of a constant-current source buffer circuit (9). Control is also effected such that during halt of control for a stepping-up action in this circuit, or within the delay period, when an output voltage (VOUT)<an input voltage (VIN), a switching element (SW3) is brought into the ON state, and simultaneously, a switching element (SW4) is brought into the OFF state, or when VOUT>VIN, the switching element (SW3) is brought into the OFF state, and simultaneously, the switching element (SW4) is brought into the ON state, and after a lapse of the delay period, the switching element (SW3) is in the OFF state, and the switching element (SW4) is in the ON state, no matter which of the output voltage (VOUT) and the input voltage (VIN) is higher when compared by a comparator (12).

Abstract: A DC/DC converter includes a main switching element and a subordinate switching element, and is arranged to supply power to load via a coil. The ON-time of a subordinate switching element in a succeeding cycle is controlled based on a period of time tdif from the time when the subordinate switching element is turned off until the time when voltage at the point of connection of the two switching elements reaches a predetermined threshold value.

Abstract: A switching power supply circuit has a current mode control circuit including current detection means, and current mode signal generation means for generating a current mode signal being a drain current of a first MOS transistor obtained by supplying a first current information signal, which is an output signal of the current detection means, to the gate of the first MOS transistor, and by connecting a first resistance to the source of the first MOS transistor, and supplies the current mode signal to a feedback control system of the switching power supply circuit.

Abstract: A PWM/PFM control circuit has a differential time generating means for forming a differential time signal representing a differential time corresponding to a difference between the pulse width of a PWM control signal and the pulse width of a PFM control signal on condition that the pulse width of the PWM control signal is smaller than the pulse width of the PFM control signal, and the oscillation frequency of a reference signal serving as a reference for forming the PWM control signal is controlled based on the differential time signal to a low value in accordance with the differential time.

Abstract: A switching power supply circuit comprises: current detection means for detecting a current flowing through an inductor; current holding means for holding the current flowing through the inductor over a past predetermined period; and current superposition means for adding to an output of an error amplifier a current superposition signal which makes an adjustment, based on a present current information signal as an output signal of the current detection means, such that the ON-period of a switching signal of a PWM comparator is shortened, and also makes an adjustment, based on a past current information signal as an output signal of the current holding means, such that the ON-period of the switching signal of the PWM comparator is lengthened.

Abstract: In a phase compensation circuit having a resistance connected to the output side of an error amplifier, a capacitor, and a conductance amplifier functioning as a capacitance amplifier circuit, capacitance is amplified by the conductance amplifier and used, whereby an essentially required capacitance is ensured, even when the capacitance of the capacitor is small.