Overview
The LM5111-1MY, produced by Texas Instruments, is a dual 5-A compound gate driver designed to replace industry standard gate drivers with improved peak output current and efficiency. This device features two independent and identical driver channels with TTL compatible logic inputs and high current totem-pole outputs. The outputs are capable of sourcing or sinking current to drive MOSFET gates, utilizing a compound structure of MOS and bipolar transistors operating in parallel. This configuration optimizes current capability over a wide output voltage and operating temperature range, reducing drive current variation with voltage and temperature.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Operating Range | 3.5 | - | 14 | V |
| VCC Undervoltage Lockout (rising) | 2.3 | 2.9 | 3.5 | V |
| VCC Undervoltage Lockout Hysteresis | 230 | - | - | mV |
| VCC Supply Current (ICC) | 1 | 2 | - | mA |
| Logic High Input Voltage (VIH) | - | 2.2 | - | V |
| Logic Low Input Voltage (VIL) | - | 0.8 | - | V |
| Output Current Capability (Sink/Source) | - | 5-A / 3-A | - | A |
| Package Types | - | SOIC (8), MSOP-PowerPAD (8) | - | - |
| Body Size (Nominal) | - | 5.00 mm x 6.00 mm (SOIC), 3.00 mm x 4.90 mm (MSOP-PowerPAD) | - | mm |
Key Features
- Compound CMOS and bipolar outputs to reduce output current variation.
- 5-A sink and 3-A source current capability.
- Available in dual noninverting, dual inverting, and combination configurations.
- Supply rail undervoltage lockout protection (UVLO).
- Pin compatible with industry standard gate drivers.
- High impedance CMOS buffers with TTL compatible threshold voltages.
- Ability to operate in parallel to double the drive current capability.
- Thermally enhanced MSOP-PowerPAD package option.
Applications
- Synchronous rectifier gate drivers.
- Switch-mode power supply gate drivers.
- Solenoid and motor drivers.
Q & A
- What is the LM5111-1MY used for?
The LM5111-1MY is used as a dual gate driver for driving MOSFET gates in various applications such as synchronous rectifiers, switch-mode power supplies, and solenoid/motor drivers.
- What are the key features of the LM5111-1MY?
The key features include compound CMOS and bipolar outputs, 5-A sink and 3-A source current capability, UVLO protection, and pin compatibility with industry standard gate drivers.
- What are the available package types for the LM5111-1MY?
The LM5111-1MY is available in SOIC (8-pin) and MSOP-PowerPAD (8-pin) packages.
- What is the VCC operating range for the LM5111-1MY?
The VCC operating range is from 3.5 V to 14 V.
- How does the undervoltage lockout (UVLO) work?
The UVLO senses the voltage difference between VCC and VEE, disabling the driver channels if the voltage falls below 2.8 V and re-enabling them when it exceeds approximately 3 V.
- Can the LM5111-1MY be operated in parallel?
- What is the significance of the compound CMOS and bipolar outputs?
The compound CMOS and bipolar outputs reduce drive current variation with voltage and temperature, providing high peak current at the critical threshold region of the MOSFET VGS and rail-to-rail output swing.
- What are the logic input voltage levels for the LM5111-1MY?
The logic high input voltage (VIH) is 2.2 V, and the logic low input voltage (VIL) is 0.8 V.
- Why is it important to have fast transition input signals?
Fast transition input signals are important to prevent the output from switching repeatedly at a high frequency, especially when operating in a parallel configuration.
- What is the body size of the MSOP-PowerPAD package?
The body size of the MSOP-PowerPAD package is 3.00 mm x 4.90 mm.
