摘要:
A power supply converter (100) comprising a first FET (210) connected to ground (230), the first FET coupled to a second FET (220) tied to an input terminal (240), both FETs conductively attached side-by-side to a first surface of a metal carrier (120) and operating as a converter generating heat; and a packaged load inductor (110) tied to the carrier and an output terminal (241), the inductor package wrapped by a metal sleeve (113) in touch with the opposite surface of the metal carrier, the sleeve operable to spread and radiate the heat generated by the converter.
摘要:
A high frequency power supply module (200) of a synchronous Buck converter stacking the control FET (210) and sync FET (220) and having the driver IC (230) integrated in the final package solution. A QFN leadframe has a rectangular flat pad (201) destined to become the heat spreader of the package; the leads (202) are positioned in line with two opposite sides of the pad, the other pad sides being free of leads. The sync FET die (220) is soldered to the pad; a first clip (240), soldered on the sync die, has the control die (210) attached by solder. A second clip (260) is soldered on top of the control die. Also soldered on the same pad, yet not stacked with the other dies, is IC driver chip (230). The IC driver is wire bonded (233) to the pins of the package and to the stacked dies. All die attach and clip attach use the same solder material in order to be reflowed in the same reflow step.
摘要:
A power supply module (400) comprising a metal leadframe with a pad (401) and a first metal clip (440) including a plate (440a), an extension (440b) and a ridge (440c); the plate and extension are spaced from the leadframe pad, and the ridge connected to an input supply. A synchronous Buck converter is in the space between the clip plate and the leadframe pad, the converter including a control FET die (410) soldered onto a sync FET die (420), the clip plate soldered to the control die having an input inductance (462), and the sync die soldered to the leadframe pad having an output capacitance. A capacitor (480a, 480b) integrated into the space between the clip extension and the leadframe pad, the clip extension soldered to the capacitor having a desired integrated inductance (463) operable to channel electrical energy from the switch node to ground.
摘要:
A packaged power supply module (100) comprising a chip (110) with a first power field effect transistor (FET) and a second chip (120) with a second FET conductively attached side-by-side onto a conductive carrier (130), the transistors having bond pads of a first area (210) and the carrier having bond pads of a second area (230) smaller than the first area. Conductive bumps (114, 115, 124, 125) attached to the transistor bond pads and conductive bumps (126) attached to the carrier bond pads have equal volume and are coplanar (150), the bumps on the transistor pads having a first height and the bumps on the carrier pads having a second height greater than the first height.