Overview
The FAN3268TMX is a dual 2 A low-voltage PMOS-NMOS bridge driver produced by onsemi. This device is optimized to drive a high-side P-channel MOSFET and a low-side N-channel MOSFET, particularly in motor control applications and buck step-down converters. It operates from a voltage rail up to 18 V and features TTL input thresholds, providing buffer and level translation functions from logic inputs. The driver includes an under-voltage lockout (UVLO) function to prevent the output switching devices from operating if the VDD supply voltage is below the operating level. The FAN3268TMX also incorporates MillerDrive architecture to minimize switching loss and ensure high current during the MOSFET turn-on and turn-off process.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range (VDD) | 4.5 | - | 18.0 | V |
| Supply Current (IDD) | - | 0.75 | 1.20 | mA |
| UVLO Turn-On Voltage | 3.5 | 3.9 | 4.3 | V |
| UVLO Turn-Off Voltage | 3.3 | 3.7 | 4.1 | V |
| Logic Low Threshold (VIL) | 0.8 | 1.2 | - | V |
| Logic High Threshold (VIH) | - | - | 2.0 | V |
| Output Sink Current (ISINK) | - | - | 2.4 | A |
| Output Source Current (ISOURCE) | - | - | 1.6 | A |
| Output Rise Time (tRISE) | 12 | - | 22 | ns |
| Output Fall Time (tFALL) | 9 | - | 17 | ns |
| Operating Ambient Temperature (TA) | -40 | - | 125 | °C |
Key Features
- Drives high-side PMOS and low-side NMOS in motor control or buck step-down applications.
- TTL input thresholds with logic hysteresis.
- Internal under-voltage lockout (UVLO) function.
- Internal 100 kΩ resistors to bias outputs during startup.
- MillerDrive architecture for reduced switching loss.
- Dual independent enable pins with default-on functionality if not connected.
- 8-lead SOIC package.
- Rated from –40°C to +125°C ambient temperature.
- Pb-free device.
Applications
- Motor control with PMOS/NMOS half-bridge configuration.
- Buck converters with high-side PMOS device, supporting 100% duty cycle operation.
- Logic-controlled load circuits with high-side PMOS switch.
Q & A
- What is the operating voltage range of the FAN3268TMX?
The FAN3268TMX operates from a voltage rail of 4.5 V to 18 V. - What type of input thresholds does the FAN3268TMX have?
The FAN3268TMX has TTL input thresholds. - What is the purpose of the under-voltage lockout (UVLO) function?
The UVLO function prevents the output switching devices from operating if the VDD supply voltage is below the operating level. - How does the MillerDrive architecture benefit the FAN3268TMX?
The MillerDrive architecture minimizes switching loss by providing high current during the MOSFET turn-on and turn-off process. - What is the package type of the FAN3268TMX?
The FAN3268TMX is available in an 8-lead SOIC package. - What are the typical applications of the FAN3268TMX?
The FAN3268TMX is typically used in motor control, buck converters, and logic-controlled load circuits. - What are the output current capabilities of the FAN3268TMX?
The FAN3268TMX can sink up to 2.4 A and source up to 1.6 A at VOUT = 6 V. - How do the internal 100 kΩ resistors function in the FAN3268TMX?
The internal 100 kΩ resistors bias the outputs to keep the external MOSFETs off during startup intervals when logic control signals may not be present. - What is the temperature range for the FAN3268TMX?
The FAN3268TMX is rated to operate from –40°C to +125°C ambient temperature. - Is the FAN3268TMX a Pb-free device?
Yes, the FAN3268TMX is a Pb-free device.
