Overview
The A3922KLPTR-T, produced by Allegro MicroSystems, is an N-channel power MOSFET driver designed to control MOSFETs in a full-bridge (H-bridge) arrangement. This component is specifically tailored for automotive applications involving high-power inductive loads, such as brush DC motors, solenoids, and actuators. It features a unique charge pump regulator that allows operation with battery voltages down to 7 V and reduced gate drive voltages as low as 5.5 V. The A3922 is packaged in a 28-pin eTSSOP and is available in lead-free versions with 100% matte-tin leadframe plating.
Key Specifications
| Characteristic | Symbol | Rating | Unit |
|---|---|---|---|
| Load Supply Voltage | VBB | –0.3 to 50 | V |
| Pumped Regulator Terminal | VREG | –0.3 to 16 | V |
| Charge Pump Capacitor Low Terminal | VCP1 | –0.3 to 16 | V |
| Charge Pump Capacitor High Terminal | VCP2 | VCP1 – 0.3 to VREG + 0.3 | V |
| Battery Compliant Logic Input Terminals | VIB | –0.3 to 50 | V |
| Logic Input Terminals | VI | –0.3 to 6 | V |
| Logic Output Terminals | VO | –0.3 to 6 | V |
| Sense Amplifier Input | VCSI | –4 to 6.5 | V |
| Sense Amplifier Output | VCSO | –0.3 to 6 | V |
| Dead Time (Turn-Off to Turn-On Delay) | tDEAD | 1.25 to 2.15 | µs |
| Propagation Delay Matching (On-to-Off) | ΔtOO | 15 to 30 | ns |
| Propagation Delay Matching (GHx-to-GLx) | ΔtHL | – to 20 | ns |
Key Features
- Full-Bridge MOSFET Driver: Capable of controlling MOSFETs in an H-bridge arrangement.
- Charge Pump Regulator: Provides a programmable gate drive voltage for battery voltages down to 7 V and allows operation with reduced gate drive voltages down to 5.5 V.
- Bootstrap Gate Drive: Uses a bootstrap capacitor to provide the above-battery supply voltage required for N-channel MOSFETs.
- Cross-Conduction Protection: Programmable dead time to protect against shoot-through.
- SPI-Compatible Serial Interface: Allows control of the bridge through the serial interface and alteration of programmable settings such as dead time, VDS threshold, and fault blank time.
- Integrated Diagnostics: Provides indication of multiple internal faults, system faults, and power bridge faults, and can be configured to protect the power MOSFETs under most short-circuit conditions.
- Current Sense Amplifier: Integrated current sense amplifier for monitoring current.
- TTL-Compatible Logic Inputs: Supports TTL-compatible logic inputs for direct control).
- Open-Load Detection: Capable of detecting open-load conditions).
- Safety-Assist Features: Designed to assist in achieving ASIL-D certification with full ISO-26262 documentation available).
Applications
The A3922KLPTR-T is specifically designed for automotive applications involving high-power inductive loads. Key applications include:
- Brush DC Motors: Controls and drives brush DC motors efficiently).
- Solenoids and Actuators: Manages the operation of solenoids and actuators in automotive systems).
- Safety-Critical Systems: Supports safety-critical applications with integrated diagnostics and compliance to ISO 26262 standards).
Q & A
- What is the primary function of the A3922KLPTR-T?
The A3922KLPTR-T is an N-channel power MOSFET driver designed to control MOSFETs in a full-bridge (H-bridge) arrangement for automotive applications).
- What is the minimum battery voltage the A3922KLPTR-T can operate with?
The A3922KLPTR-T can operate with battery voltages down to 7 V and reduced gate drive voltages down to 5.5 V).
- How does the A3922KLPTR-T protect against shoot-through?
The A3922KLPTR-T uses programmable dead time to protect against shoot-through).
- What interface does the A3922KLPTR-T use for control and diagnostics?
The A3922KLPTR-T uses an SPI-compatible serial interface for control and diagnostics).
- What types of faults can the integrated diagnostics detect?
The integrated diagnostics can detect multiple internal faults, system faults, and power bridge faults).
- Is the A3922KLPTR-T compliant with any safety standards?
Yes, the A3922KLPTR-T is designed to comply with ISO 26262 standards and supports achieving ASIL-D certification).
- What is the package type of the A3922KLPTR-T?
The A3922KLPTR-T is supplied in a 28-pin eTSSOP package).
- Does the A3922KLPTR-T support TTL-compatible logic inputs?
Yes, the A3922KLPTR-T supports TTL-compatible logic inputs).
- Can the A3922KLPTR-T detect open-load conditions?
Yes, the A3922KLPTR-T is capable of detecting open-load conditions).
- What are some common applications of the A3922KLPTR-T?
Common applications include brush DC motors, solenoids, and actuators in automotive systems).
