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Datasheets:
A3946: Half-Bridge Power MOSFET Controller (PDF)
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Power Motor Drivers - Brushless DC
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
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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
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3946KLBTR-T | 16-lead SOIC | Yes | view data | -40 °C to 135 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3946KLPTR-T | 16-lead TSSOP | Yes | view data | -40 °C to 135 °C |
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.