Overview
The LM5112, produced by Texas Instruments, is a high-speed, high-peak current single-channel MOSFET gate driver. This device is available in a tiny 6-pin WSON package (SOT-23 equivalent footprint) or an 8-pin exposed-pad MSOP package, both designed to enhance power dissipation for high-frequency operations. The LM5112 features a compound output driver stage that includes both MOS and bipolar transistors, which together provide more than 7 A peak current to capacitive loads, reducing output current variation with voltage and temperature. This driver is particularly useful for applications requiring fast rise and fall times, such as DC to DC and AC to DC switch-mode power supplies, solar microinverters, and solenoid and motor drives.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC - IN_REF and VCC - VEE) | 3.5 | 14 | V | ||
| Undervoltage Lockout (UVLO) Rising | VCC - IN_REF | 2.4 | 3 | 3.5 | V |
| UVLO Hysteresis | 230 | mV | |||
| Supply Current (ICC) | 1 | 2 | mA | ||
| Logic High Input Voltage (VIH) | 2.3 | V | |||
| Logic Low Input Voltage (VIL) | 0.8 | V | |||
| Peak Source Current (ISOURCE) | OUT = VCC/2, 200ns pulsed current | 3 | A | ||
| Peak Sink Current (ISINK) | OUT = VCC/2, 200ns pulsed current | 7 | A | ||
| Rise Time (tr) | CLOAD = 2 nF | 14 | ns | ||
| Fall Time (tf) | CLOAD = 2 nF | 12 | ns | ||
| Propagation Delay Time Low to High (td1) | CLOAD = 2 nF | 25 | 40 | ns | |
| Propagation Delay Time High to Low (td2) | CLOAD = 2 nF | 25 | 40 | ns | |
| Junction to Ambient Thermal Resistance (θJA) | WSON-6 Package | 40 | °C/W | ||
| Junction to Case Thermal Resistance (θJC) | WSON-6 Package | 7.5 | °C/W |
Key Features
- High peak gate drive current: 7 A sink, 3 A source
- Fast propagation times: 25 ns typical
- Fast rise and fall times: 14 ns rise, 12 ns fall with 2 nF load
- Inverting and non-inverting inputs for flexible configuration
- Supply rail undervoltage lockout protection
- Dedicated input ground (IN_REF) for split supply or single supply operation
- Power enhanced 6-pin WSON package or thermally enhanced MSOP-PowerPAD package
- Output swings from VCC to VEE, which can be negative relative to input ground
- Compound CMOS and bipolar outputs to reduce output current variation
Applications
- DC to DC switch-mode power supplies
- AC to DC switch-mode power supplies
- Solar microinverters
- Solenoid and motor drives
Q & A
- What is the peak gate drive current of the LM5112?
The LM5112 can source up to 3 A and sink up to 7 A peak current.
- What are the typical rise and fall times of the LM5112 with a 2 nF load?
The typical rise time is 14 ns, and the typical fall time is 12 ns.
- Does the LM5112 support both inverting and non-inverting inputs?
- What is the purpose of the undervoltage lockout (UVLO) feature in the LM5112?
The UVLO feature prevents damage to the MOSFET by disabling the driver if the supply voltage drops below a certain threshold.
- What are the recommended operating voltage ranges for VCC and IN_REF?
The minimum recommended operating voltage between VCC and IN_REF is 3.5 V, and the maximum is 14 V.
- Can the LM5112 operate in both single and split supply configurations?
- What is the significance of the compound CMOS and bipolar output stage in the LM5112?
The compound output stage reduces output current variation with voltage and temperature.
- What are the thermal resistance values for the WSON-6 and MSOP-PowerPAD packages?
- What are some key considerations for board layout when using the LM5112?
- Is the LM5112 AEC-Q100 qualified?
