Site Map • Contact Us
中文 • English

High-Performance Power ICs and Hall-Effect Sensors

• Search Allegromicro.com:
  
• Home
• Products
  • • Hall-Effect Sensors
    • Power ICs
    • Power Management
    • Sanken
  • Applications
    • Appliances
    • Automotive
    • LED Lighting and Displays
    • Office Automation
    • Portable
  • Part Numbers
  • Design Center
  • Packaging
  • Store
• Corporate
  • About Us
  • Contact Us
  • Environment
  • Facilities
  • Jobs
  • Legal
    • Terms and Conditions
      of Sale
  • Press Room
  • Quality
• Sales
  • Americas
  • Europe
  • Asia Pacific
  • Japan
• Site Map
• Feedback

Related Links:

Datasheets:
A3946: Half-Bridge Power MOSFET Controller (PDF)

Selection Guides:
Power Integrated Circuits,

Automotive ICs,

Power Motor Drivers,

Power Motor Drivers - Brushless DC

when this product is updated

Press Releases:
A3946: Allegro MicroSystems, Inc. Announces Half-Bridge Pre-Driver IC Targeted at High-Power Automotive and Industrial Loads,

Allegro MicroSystems, Inc. Announces Family of Pre-Driver ICs for Driving High Current Automotive and Industrial Actuators

A3946
Half-Bridge Power MOSFET Controller

Features

• On-chip charge pump for 7 V minimum input supply voltage
• High-current gate drive for driving a wide range of N-channel MOSFETs
• Bootstrapped gate drive with charge pump for 100% duty cycle
• Overtemperature protection
• Undervoltage protection
• -40°C to 135°C ambient operation

Description

The A3946 is designed specifically for applications that require high power unidirectional DC motors, three-phase brushless DC motors, or other inductive loads. The A3946 provides two high-current gate drive outputs that are capable of driving a wide range of power N-channel MOSFETs. The high-side gate driver switches an N-channel MOSFET that controls current to the load, while the low-side gate driver switches an N-channel MOSFET as a synchronous rectifier.

A bootstrap capacitor provides the above-battery supply voltage required for N-channel MOSFETs. An internal top-off charge pump for the high side allows DC (100% duty cycle) operation of the half-bridge.

The A3946 is available in a choice of two power pack ages: a 16-lead SOIC with two internally-fused pins for enhanced power dissipation (part number suffix LB), and a 16-lead TSSOP with exposed thermal pad (suffix LP). Both packages have a lead (Pb) free version, with 100% matte tin plated leadframes (suffix -T).

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3946KLB	16-lead SOIC	No	view data	-40 °C to  135 °C	contact factory	samples not available
A3946KLB-T	16-lead SOIC	Yes	view data	-40 °C to  135 °C	contact factory	Contact Local Sales Representative
A3946KLBTR	16-lead SOIC	No	view data	-40 °C to  135 °C	contact factory	samples not available
A3946KLBTR-T	16-lead SOIC	Yes	view data	-40 °C to  135 °C	contact factory	samples not available
A3946KLP	16-lead TSSOP	No	view data	-40 °C to  135 °C	contact factory	Contact Marketing Representative
A3946KLP-T	16-lead TSSOP	Yes	view data	-40 °C to  135 °C	contact factory	Contact Local Sales Representative
A3946KLPTR	16-lead TSSOP	No	view data	-40 °C to  135 °C	contact factory	samples not available
A3946KLPTR-T	16-lead TSSOP	Yes	view data	-40 °C to  135 °C	contact factory	samples not available

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.