MOSFET gate driver A4957 series

MOSFET gate driver - A4957 series - ALLEGRO MICROSYSTEMS
MOSFET gate driver - A4957 series - ALLEGRO MICROSYSTEMS
MOSFET gate driver - A4957 series - ALLEGRO MICROSYSTEMS - image - 2
MOSFET gate driver - A4957 series - ALLEGRO MICROSYSTEMS - image - 3
MOSFET gate driver - A4957 series - ALLEGRO MICROSYSTEMS - image - 4
Add to favorites
Compare this product
 

Characteristics

Options
MOSFET

Description

The A4957 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for 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 A4957 to operate with a reduced gate drive, down to 4.5 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 A4957 is supplied in a 24-contact 4 mm × 4 mm × 0.75 mm QFN with an exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating (suffix T).

Catalogs

No catalogs are available for this product.

See all of ALLEGRO MICROSYSTEMS‘s catalogs
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.