Key facts
- Brand
- Allegro
- Model
- A3940
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-03
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Allegro MicroSystems A3940KLP/A3940KLW Full-Bridge Power MOSFET Controller Data Sheet
The A3940KLP and A3940KLW are full-bridge power MOSFET controllers specifically designed for automotive applications requiring high-power motors. Each device provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration.
Key features include an internal charge pump that allows for 100% duty cycle operation, synchronous rectification, and comprehensive protection features such as supply under/overvoltage, thermal shutdown, and motor lead short-to-battery or ground fault notification. The devices are available in two power packages: a 28-pin TSSOP with an exposed thermal pad (A3940KLP) and a 28-pin wide-body SOIC (A3940KLW).
Allegro A3940 specifications
| Operating Temperature Range (TA) | -40°C to +135°C |
|---|---|
| Junction Temperature (TJ) | +150°C |
| Gate Drive Output Current (ICP) | 15 mA Typ |
| Thermal Shutdown Temperature | +172°C |
| VBB Undervoltage Threshold | 5.25 V Typ |
Source: Allegro MicroSystems A3940KLP/A3940KLW Full-Bridge Power MOSFET Controller Data Sheet
All Allegro A3940 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What are the available package types for the A3940?
The device is supplied in a 28-pin TSSOP with an exposed thermal pad (A3940KLP) and a 28-pin wide-body SOIC (A3940KLW).
From: Allegro MicroSystems A3940KLP/A3940KLW Full-Bridge Power MOSFET Controller Data Sheet
Can the controller operate at a 100% duty cycle?
Yes, an internal charge pump for the high side allows for dc (100% duty cycle) operation of the bridge.
From: Allegro MicroSystems A3940KLP/A3940KLW Full-Bridge Power MOSFET Controller Data Sheet
What is the operating temperature range for the A3940?
The device operates from -40°C to +135°C.
From: Allegro MicroSystems A3940 Full-Bridge Power MOSFET Controller Datasheet
Does the A3940 support 100% duty cycle operation?
Yes, the internal charge pump allows for dc (100% duty cycle) operation of the bridge.
From: Allegro MicroSystems A3940 Full-Bridge Power MOSFET Controller Datasheet