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Datasheets:
A4940: Automotive Full Bridge MOSFET Driver (PDF)
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Power Motor Drivers
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A4940: Allegro MicroSystems, Inc. Introduces New Full-Bridge MOSFET Pre-Driver IC
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A4940
Automotive Full Bridge MOSFET Driver
Features
- High current gate drive for N-channel MOSFET full bridge
- Independent control of each MOSFET
- Charge pump for low supply voltage operation
- Cross-conduction protection with adjustable dead time
- 5.5 to 50 V supply voltage range
- Diagnostics output
- Low current sleep mode
Description
The A4940 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications with high-power inductive loads such as brush DC motors.
A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A4940 to operate with a reduced gate drive, down to 5.5 V.
A bootstrap capacitor is used to provide the above battery supply voltage required for N-channel MOSFETs. A unique bootstrap charge management system ensures that the bootstrap capacitor is always sufficiently charged to supply the high-side gate drive circuit.
Each of the power MOSFETs is controlled independently but all are protected from shoot-through by dead time that is userconfigured by an external resistor.
Integrated diagnostics provide indication of undervoltage and overtemperature faults.
The A4940 is supplied in a 24-pin TSSOP power package with an exposed pad for enhanced thermal dissipation (package type LP). It is lead (Pb) free, with 100% matte tin leadframe plating (suffix –T).
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A4940KLPTR-T | 24-lead TSSOP | Yes | view data | -40 °C to 125 °C | new |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.