Multi-chip module for battery power control

1. A multi-chip module comprising:

a metal leadframe structure including a first lead, a second lead, a third lead, a fourth lead, and at least two independent die mounting pads electrically isolated from one another, the at least two independent die mounting pads including a first pad for mounting at least one integrated circuit chip and a second pad for mounting at least one transistor device chip;

an integrated circuit chip mounted on the first pad;

a first MOSFET transistor mounted on the second pad, the first MOSFET transistor having a gate electrode, a source electrode, and a drain electrode, the first MOSFET transistor being mounted so that its drain electrode faces the second pad and is electrically coupled to the second pad;

a second MOSFET transistor mounted on the second pad, the second MOSFET transistor having a gate electrode, a source electrode, and a drain electrode, the second MOSFET transistor being mounted so that its drain electrode faces the second pad and is electrically coupled to the second pad;

a first plurality of bonding wires having a first diameter connecting the integrated circuit chip to the first and second leads and to at least the gate electrodes of the first and second MOSFET transistors; and

a second plurality of bonding wires having a second diameter greater than the first diameter connecting the source electrodes of the first and second MOSFET transistors to the third and fourth leads, respectively; and

wherein said mounting pads are exposed on the back side of the module and wherein the module includes an epoxy molding material.

2. The module of claim 1 wherein the leadframe structure includes a dedicated test lead.

3. The module of claim 1 wherein at least one of the die mounting pads has no external leads, mounting pads, or other die mounting pads along both of two opposite sides of the pad.

4. A multi-chip module comprising:

an integrated circuit chip;

a first power transistor;

a second power transistor;

a first connection structure electrically coupling the integrated circuit chip to the first power transistor;

a second connection structure electrically coupling the integrated circuit chip to the second power transistor;

a leadframe structure comprising a first lead, a second lead, a third lead and a fourth lead, wherein the integrated circuit chip, the first power transistor, and the second power transistor are mounted on the leadframe structure;

a third connection structure electrically coupling the integrated circuit chip to the third lead;

a fourth connection structure electrically coupling the integrated circuit chip to the fourth lead, the fourth lead being separate from the third lead;

a molding material covering at least part of the integrated circuit chip, the first power transistor, the second power transistor, the first connection structure, and the second connection structure,

wherein the first lead provides an electrical connection to the first power transistor and the second lead provides an electrical connection to the second power transistor, and

wherein the first and second leads are at a first end of the multi-chip module, and the third and fourth leads are at a second end of the multi-chip module.

5. The multi-chip module of claim 4 wherein the leadframe further comprises a test lead and a bonding structure electrically coupling the test lead and the integrated circuit chip, and wherein the leads in the leadframe structure include only the test lead and the first, second, third, and fourth leads.

6. The multi-chip module of claim 4 wherein the multi-chip module has an elongated shape and an aspect ratio greater than 1.

7. The multi-chip module of claim 4 wherein the first power transistor and the second power transistor are in a single power chip and the first power transistor and the second power transistor are vertical power MOSFETs.

8. The multi-chip module of claim 4 wherein the first and second bonding structures are wires, and wherein the leadframe structure comprises a first die mounting pad and a second die mounting pad, the integrated circuit chip being mounted on the first die mounting pad and the first and second power transistors being present in one or more chips, the one or more chips being mounted on the second die mounting pad.

9. An electrical assembly comprising:

a circuit board; and

the multi-chip module of claim 4 mounted on the circuit board.

10. A system comprising:

the electrical assembly of claim 9 ; and

a rechargeable battery electrically coupled to the electrical assembly.

11. The multi-chip module of claim 8 wherein the leadframe structure further comprises a test lead electrically coupled to the integrated circuit chip.

12. The multi-chip module of claim 8 wherein an exterior surface of leadframe structure is exposed through the molding material.

13. A multi-chip module comprising:

an integrated circuit chip;

a first power transistor;

a second power transistor;

a first connection structure electrically coupling the integrated circuit chip to the first power transistor;

a second connection structure electrically coupling the integrated circuit chip to the second power transistor;

a leadframe structure comprising a first lead, a second lead, a third lead, a fourth lead, and a test lead, wherein the integrated circuit chip, the first power transistor, and the second power transistor are mounted on the leadframe structure;

a bonding structure electrically coupling the test lead and the integrated circuit chip; and

a molding material covering at least part of the integrated circuit chip, the first power transistor, the second power transistor, the first connection structure, and the second connection structure,

wherein the first lead provides an electrical connection to the first power transistor and the second lead provides an electrical connection to the second power transistor,

wherein the first and second leads are at a first end of the multi-chip module, and the third and fourth leads are at a second end of the multi-chip module, and

wherein the leads in the leadframe structure include only the test lead and the first, second, third, and fourth leads.