Overview
The A6862KLPTR-T is an N-channel power MOSFET driver designed by Allegro MicroSystems. It is specifically engineered to control MOSFETs connected as a 3-phase solid-state relay in phase-isolation applications. This driver is particularly useful in safety-critical automotive and industrial environments where high reliability and redundancy are essential. The A6862 features three independent floating gate drive outputs, enabling the power MOSFETs to remain in the on-state over the full supply range, even with high phase-voltage slew rates. An integrated charge pump regulator ensures that the power MOSFETs can be maintained in the on-state continuously, even when the phase voltage equals the battery voltage.
Key Specifications
| Characteristic | Symbol | Rating | Units |
|---|---|---|---|
| Load Voltage Supply | VBB | –0.3 to 50 | V |
| Pumped Supply Voltage | VCP | VBB – 0.3 to VBB + 12 | V |
| Gate Drive Voltage | VGX | VSX – 0.3 to VSX + 12 | V |
| Operating Ambient Temperature | TA | –40 to 150 | °C |
| Maximum Continuous Junction Temperature | TJ(max) | 165 | °C |
| Transient Junction Temperature | TJt | 175 (for 10 seconds, not exceeding 10 hours) | °C |
| Package Type | 16-lead TSSOP with exposed thermal pad | ||
| Switch-On Time | Typically 8 µs | ||
| Switch-Off Time | Typically 1 µs |
Key Features
- Three independent floating gate drive outputs to control MOSFETs in 3-phase solid-state relay configurations.
- Integrated charge pump regulator to maintain power MOSFETs in the on-state even when phase voltage equals battery voltage.
- High phase-voltage slew rates tolerance.
- Single logic-level input to control all three gate drives.
- Two independent activation inputs (POK and IG) for low-power sleep mode and charge pump disable.
- Undervoltage monitors for pumped supply voltage and gate drive outputs.
- Lead (Pb) free with 100% matte-tin leadframe plating.
- 16-lead TSSOP package with exposed thermal pad for enhanced thermal dissipation.
Applications
- Safety-critical automotive applications requiring phase isolation and redundancy.
- Industrial applications needing high reliability and redundancy in 3-phase solid-state relay configurations.
- Motor isolation in systems requiring up to ASIL-D system rating.
- Power tool designs and robotic systems where high current and phase isolation are necessary.
Q & A
- What is the primary function of the A6862KLPTR-T?
The A6862KLPTR-T is an N-channel power MOSFET driver designed to control MOSFETs connected as a 3-phase solid-state relay in phase-isolation applications.
- What is the role of the integrated charge pump regulator in the A6862KLPTR-T?
The integrated charge pump regulator provides the above-battery supply voltage necessary to maintain the power MOSFETs in the on-state continuously when the phase voltage is equal to the battery voltage.
- How are the gate drives controlled in the A6862KLPTR-T?
The three gate drives can be controlled by a single logic-level input on the enable (ENA) terminal.
- What are the typical switch-on and switch-off times for the MOSFETs controlled by the A6862KLPTR-T?
The MOSFETs typically switch on within 8 µs and switch off within 1 µs.
- How does the A6862KLPTR-T handle low-power sleep mode?
The device can be put into a low-power sleep mode by setting either of the two activation inputs (POK or IG) low, which disables the charge pump and turns off the outputs.
- What is the significance of the undervoltage monitors in the A6862KLPTR-T?
The undervoltage monitors ensure that the pumped supply voltage and the gate drive outputs are high enough to maintain the MOSFETs in a safe conducting state.
- What is the package type and thermal characteristics of the A6862KLPTR-T?
The device is packaged in a 16-lead TSSOP with an exposed thermal pad, and it has a junction-to-ambient thermal resistance of 34 °C/W on a 4-layer PCB.
- Is the A6862KLPTR-T suitable for safety-critical applications?
Yes, the A6862KLPTR-T is designed for safety-critical applications and can help achieve up to ASIL-D system rating.
- What are some typical applications of the A6862KLPTR-T?
Typical applications include automotive systems, industrial control systems, power tool designs, and robotic systems where high current and phase isolation are necessary.
- Is the A6862KLPTR-T lead-free and RoHS compliant?
Yes, the A6862KLPTR-T is lead (Pb) free with 100% matte-tin leadframe plating and is RoHS compliant.
