Overview
The LM5111-1MYX, 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 to optimize current capability over a wide output voltage and operating temperature range.
The LM5111-1MYX is available in the MSOP-PowerPAD package, which is thermally enhanced, and is pin-compatible with industry standard gate drivers. It includes an undervoltage lockout (UVLO) circuit to prevent operation under low supply voltage conditions, ensuring reliable and stable performance.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC Operating Range | VCC - VEE | 3.5 | 14 | V | |
| VCC Undervoltage Lockout (rising) | VCC - VEE | 2.3 | 2.9 | 3.5 | V |
| VCC Undervoltage Lockout Hysteresis | 230 | mV | |||
| VCC Supply Current (ICC) | IN_A = IN_B = 0 V | 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 | |||
| Package | MSOP-PowerPAD |
Key Features
- Compound CMOS and Bipolar Outputs: Reduces output 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.
- High Current Capability: Each driver channel can sink more than 5-A peak from capacitive loads and source up to 3-A.
- Undervoltage Lockout (UVLO): Protects against operation under low supply voltage conditions, with hysteresis to prevent chattering during brown-out conditions.
- TTL-Compatible Logic Inputs: High impedance CMOS buffers with TTL-compatible threshold voltages.
- Parallel Operation Capability: Driver channels can be connected in parallel to double the drive current capability.
- Thermally Enhanced Package: Available in MSOP-PowerPAD package for improved thermal performance.
- Pin Compatibility: Compatible with industry standard gate drivers.
Applications
- Synchronous Rectifier Gate Drivers: Ideal for high-frequency power supplies where efficient switching is crucial.
- Switch-Mode Power Supply Gate Drivers: Suitable for driving MOSFETs in switch-mode power supplies.
- Solenoid and Motor Drivers: Can be used to drive solenoids and motors due to its high current capability.
Q & A
- What is the peak output current capability of the LM5111-1MYX?
The LM5111-1MYX can sink more than 5-A peak from capacitive loads and source up to 3-A.
- What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature protects against operation under low supply voltage conditions and prevents chattering during brown-out conditions.
- What are the logic input voltage levels for the LM5111-1MYX?
The logic high input voltage (VIH) is 2.2 V, and the logic low input voltage (VIL) is 0.8 V.
- Can the LM5111-1MYX be operated in parallel to increase drive current capability?
Yes, the driver channels can be connected in parallel to double the drive current capability.
- What package options are available for the LM5111-1MYX?
The LM5111-1MYX is available in the MSOP-PowerPAD package.
- What are some common applications for the LM5111-1MYX?
Common applications include synchronous rectifier gate drivers, switch-mode power supply gate drivers, and solenoid and motor drivers.
- How does the compound output structure of the LM5111-1MYX benefit its performance?
The compound structure of MOS and bipolar transistors reduces output current variation with voltage and temperature, providing high peak current and rail-to-rail output swing.
- What is the operating range for the VCC supply voltage of the LM5111-1MYX?
The VCC operating range is from 3.5 V to 14 V.
- Is the LM5111-1MYX compatible with industry standard gate drivers?
Yes, the LM5111-1MYX is pin-compatible with industry standard gate drivers.
- What is the significance of the high impedance CMOS buffers in the LM5111-1MYX?
The high impedance CMOS buffers provide TTL-compatible logic inputs, ensuring compatibility with a wide range of control signals.
