Allegro MicroSystems A4940
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. 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. 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.| Part No. | A4940 |
|---|---|
| Datasheet | A4940 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Automotive Full Bridge MOSFET Driver |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● 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 PACKAGE: 24-pin TSSOP with exposed thermal pad (suffix LP) Not to scale
DESCRIPTION
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. 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). FAULT AHI BHI ALO BLO Typical Application A4940 VBAT M A4940-DS, Rev.
