Key facts
- Brand
- Allegro
- Model
- A3985
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-04
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Allegro MicroSystems A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver Datasheet
The A3985 is a flexible dual full-bridge gate driver suitable for driving a wide range of higher power industrial bipolar 2-phase stepper motors or 2-phase brushless DC motors. It features a serial interface for full digital control, allowing programming of off-time, blank-time, dead-time, mixed decay ratios, and synchronous rectification. Motor power is provided by external N-channel power MOSFETs at supply voltages from 12 to 50 V.
The device includes internal circuit protection such as thermal shutdown with hysteresis and undervoltage lockout. It is supplied in a 38-pin TSSOP package (suffix LD) with 100% matte tin leadframe plating. The component is designed for applications requiring precise current control and efficient operation.
Allegro A3985 specifications
| Supply Voltage Range | 12 to 50 V |
|---|---|
| Operating Ambient Temperature | -20 to 85 °C |
| Junction Temperature | 150 °C |
| Package Type | 38 pin TSSOP |
| Internal Oscillator Frequency | 4 MHz |
| Maximum Clock Input Frequency | 10 MHz |
Source: Allegro MicroSystems A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver Datasheet
All Allegro A3985 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the supply voltage range?
The device operates with a supply voltage range from 12 to 50 V.
From: Allegro MicroSystems A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver Datasheet
Does the A3985 require special power-up sequencing?
No, special power-up sequencing is not required for this component.
From: Allegro MicroSystems A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver Datasheet