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Datasheets:
A3935: Three-Phase Power MOSFET Controller (PDF)
Selection Guides:
Power Integrated Circuits,
Automotive ICs,
Power Motor Drivers,
Power Motor Drivers - Brushless DC
Technical Publications:
Component Selection for the 3935 Boost Converter (PDF)
Press Releases:
A3935: Allegro MicroSystems, Inc. Announces Three Phase Pre-Drive IC Targeted at High Power Automotive and Industrial Motors,
Allegro MicroSystems, Inc. Announces Family of Pre-Driver ICs for Driving High Current Automotive and Industrial Actuators
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A3935
Three-Phase Power MOSFET Controller
Features
- Drives wide range of N-channel MOSFETs in 3-phase bridges
- PFM boost converter for use with low-voltage battery supplies
- Internal LDO regulator for gate-driver supply
- Bootstrap circuits for high-side gate drivers
- Current monitor output
- Adjustable battery overvoltage detection
- Diagnostic outputs
- Motor lead short-to-battery, short-to-ground, and bridge-open protection
- Undervoltage protection
- –40°C to 150°C TJ operation
- Thermal shutdown
Description
The A3935 is designed specifically for automotive applications that require high-power motors. Each provides six high-current gate drive outputs capable of driving a wide range of N-channel power MOSFETs.
A requirement of automotive systems is steady operation over a varying battery input range. The A3935 integrates a pulse-frequency modulated boost converter to create a constant supply voltage for driving the external MOSFETs. Bootstrap capacitors are utilized to provide the above battery supply voltage required for N-channel FETs.
Direct control of each gate output is possible via six TTL-compatible inputs. A differential amplifier is integrated to allow accurate measurement of the current in the three-phase bridge.
Diagnostic outputs can be continuously monitored to protect the driver from short-to-battery, short-to-supply, bridge-open, and battery under/overvoltage conditions. Additional protection features include dead-time, VDD undervoltage, and thermal shutdown.
The A3935 is supplied in a 36-lead 0.8 mm pitch QSOP (package LQ, similar to SOICW). The lead (Pb) free variants (suffix –T ) have 100% matte tin leadframe plating.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3935KLQ | 36-lead QSOP | No | view data | -40 °C to 135 °C |
Contact Local Sales Representative or check distributor stock |
||
| A3935KLQTR | 36-lead QSOP | No | view data | -40 °C to 135 °C | not for new design |
Contact Local Sales Representative or check distributor stock |
|
| A3935KLQTR-T | 36-lead QSOP | 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.