US 6,154,411 AGranted

Boosting circuit compensating for voltage fluctuation due to operation of load

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorFukashi Morishita

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Abstract

A boosting circuit is provided with a voltage detection circuit, first through fourth oscillators, and first through fourth charge pump circuits. The voltage detection circuit compares each of the first through fourth voltages obtained by dividing a boosted voltage with a reference voltage, and generates first through fourth activation signals. The first through fourth oscillators output pulse signals at first through fourth frequencies, respectively, as first through fourth drive signals. The first through fourth charge pump circuits operate in response to the first through fourth drive signals, respectively, and boost the boosted voltage. Accordingly, it is possible to provide a stable boosted voltage, with suppressing over shoot and under shoot with respect to the boosted voltage as a target.

Claims11

Dependent claims

A boosting circuit, comprising:

(a) a boosted node receiving a voltage higher than a power supply voltage;
(b) a voltage detection circuit, receiving said voltage from the boosted node and a reference voltage, said voltage detection circuit including:
a voltage divider receiving the voltage of said boosted node, generating a plurality of voltages lower than the voltage of said boosted nodes, and outputting said plurality of voltages respectively to a plurality of output nodes, wherein said plurality of voltages are different from each other;
and
a plurality of comparators respectively corresponding to said plurality of voltages from said plurality of output nodes of said voltage divider, each comparator comparing a corresponding voltage with said reference voltage to generate an activation signal when the corresponding voltage is lower than said reference voltage;
and
(c) a booster circuit boosting the voltage of said boosted node in response to the activation signal from one of said plurality of comparators.

4 more elements

Dependencies are inferred from the claim text.