Overview
The LM5111-1MX, produced by Texas Instruments, is a dual 5-A compound gate driver designed to drive two N-channel MOSFETs in various configurations such as half-bridge or synchronous buck converters. 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 efficiently. The driver output consists of a compound structure with MOS and bipolar transistors operating in parallel, optimizing current capability over a wide output voltage and operating temperature range.
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 | |
| Output Current Capability | Sink/Source | 5 A / 3 A | - | - | A |
| Propagation Time | - | - | 25 ns | ns | |
| Rise and Fall Times | - | 14 ns / 12 ns | - | ns | |
| Package | - | - | SOIC, MSOP-PowerPAD | - |
Key Features
- Independently drives two N-channel MOSFETs with TTL compatible logic inputs.
- Compound CMOS and bipolar outputs to reduce output current variation.
- 5-A sink and 3-A source current capability.
- Two channels can be connected in parallel to double the drive current.
- Fast propagation times (25 ns typical) and rise and fall times (14 ns and 12 ns respectively).
- Undervoltage lockout (UVLO) circuit to prevent operation below a specified voltage threshold.
- High impedance CMOS buffers with TTL compatible threshold voltages.
- Designed for compatibility with industry standard gate drivers in single supply gate driver applications.
Applications
The LM5111-1MX is suitable for a variety of applications, including:
- Half-bridge and synchronous buck converters.
- Power supply systems requiring high current gate drive capabilities.
- Motor control and drive systems.
- High-frequency switching applications.
- DC-DC converters and other power management circuits.
Q & A
- What is the primary function of the LM5111-1MX?
The LM5111-1MX is a dual gate driver designed to drive two N-channel MOSFETs in various configurations.
- What are the output current capabilities of the LM5111-1MX?
The device can sink up to 5 A and source up to 3 A of current.
- What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature disables the driver channels when the VCC to VEE voltage difference falls below a specified threshold, preventing operation during brown-out conditions.
- Can the two channels of the LM5111-1MX be connected in parallel?
Yes, the two channels can be connected in parallel to double the drive current.
- What are the typical propagation and rise/fall times of the LM5111-1MX?
The typical propagation time is 25 ns, and the rise and fall times are 14 ns and 12 ns respectively.
- What types of packages are available for the LM5111-1MX?
The device is available in SOIC and MSOP-PowerPAD packages.
- What is the operating voltage range for the VCC supply of the LM5111-1MX?
The VCC operating range is from 3.5 V to 14 V.
- How does the LM5111-1MX handle slow rising and falling input signals?
Slow rising and falling input signals may cause the output to switch repeatedly at a high frequency, but this is not harmful to the driver.
- What are some common applications for the LM5111-1MX?
Common applications include half-bridge and synchronous buck converters, power supply systems, motor control, and high-frequency switching applications.
- Are the driver channels of the LM5111-1MX identical?
Yes, the two driver channels are designed as identical cells, ensuring nearly identical AC and DC performance.
