A4926 Datasheet, PDF (1/36 Pages) Allegro MicroSystems – Automotive Half-Bridge MOSFET Driver

A4926
Automotive Half-Bridge MOSFET Driver
FEATURES AND BENEFITS
• Half-bridge MOSFET driver
• Bootstrap gate drive for N-channel MOSFET bridge
• Cross-conduction protection with adjustable dead time
• Charge pump regulator for low supply voltage operation
• 5.5 to 50 V supply voltage operating range
• SPI-compatible serial interface
• Bridge control by direct logic inputs or serial interface
• Programmable gate drive
• Programmable diagnostics
2
• A²SIL product—device features for
-
safety-critical systems
APPLICATIONS
• Anti-lock braking systems (ABS)
• HVAC (blower fan)
• DC pumps (fuel, oil, water)
• Solenoids and actuators
• Similar industrial applications
PACKAGE:
20-lead TSSOP with
exposed pad (suffix LP)
Not to scale
DESCRIPTION
The A4926 is an N-channel power MOSFET driver capable of
controlling MOSFETs connected in a half-bridge arrangement
and is specifically designed for automotive applications with
high-power inductive loads, such as brush DC motors solenoids
and actuators.
The A4926 is intended for automotive systems that must meet
ASIL requirements. In common with other Allegro A²SIL^™
products, this device incorporates features to complement
proper system design, allowing users to achieve the required
ASIL level.
A unique charge pump regulator provides full gate drive for
battery voltages down to 5.5Vfor most applications.Abootstrap
capacitor is used to provide the above-battery supply voltage
required for N-channel MOSFETs.
The half bridge can be controlled by independent logic-level
inputs or through the SPI-compatible serial interface. The
external power MOSFETs are protected from shoot-through
by a programmable dead time.
Integrated diagnostics provide indication of multiple internal
faults, system faults, and power bridge faults, and can be
configured to protect the power MOSFETs under most short-
circuit conditions.
In addition to providing full access to the bridge control, the
serial interface is also used to alter programmable settings such
as dead time, V_DS threshold, and fault blank time. Detailed
diagnostic information can be read through the serial interface.
The A4926 is supplied in a 20-lead eTSSOP (suffix LP). This
package is lead (Pb) free, with 100% matte-tin leadframe
plating (suffix –T).
A4926-DS, Rev. 2
VBAT
ECU
A4926
Load
SPI
GND
Figure 1: Typical Application
April 24, 2017