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US 7,605,641 B2Granted
Apparatus comprising a charge pump and LCD driver comprising such an apparatus
AssigneeNXP B.V.
InventorAndy Negoi
Life of this patent
Estimating the term…
Abstract
Apparatus comprising a charge pump (20) with multiple independently regulated outputs (V1, V2) for providing different voltage levels at each of said outputs. The charge pump (20) comprises a low voltage input (12), on/off regulation (30), and at least two charge stages (11, 21) which arc arranged in a cascaded manner. Each charge stage (11, 21) comprises a stage capacitor (16, 26), a switch (S1, S3), and a buffer (15, 25) for pumping a bottom plate of the stage capacitor (16, 26).
Claims14
Apparatus comprising:
- a charge pump with multiple independently regulated outputs for providing different voltage levels at each of said outputs, said charge pump comprising a low voltage input, and on/off regulation, and at least two charge stages being arranged in a cascaded manner, each charge stage comprising:
- a stage capacitor,
- a switch,
- a buffer for pumping a bottom plate of the stage capacitor, and
- a capacitor being arranged between an output node and ground.
2 more elements
Dependencies are inferred from the claim text.