LM5112SDX

Logic Voltage - VIL, VIH:	0.8V, 2.3V
Base Part Number:	LM5112
Supplier Device Package:	6-WSON (3x3)
Package / Case:	6-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Rise / Fall Time (Typ):	14ns, 12ns
Input Type:	Inverting, Non-Inverting
Current - Peak Output (Source, Sink):	3A, 7A
Series:	--
Voltage - Supply:	3.5 V ~ 14 V
Gate Type:	N-Channel MOSFET
Number of Drivers:	1
Channel Type:	Single
Driven Configuration:	Low-Side
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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LM5112SDX Application Field and Working Principle

PMIC (Power Management ICs) are vital components of today’s increasingly complex power systems. They provide crucial control and power conversion roles between power sources such as batteries, regulators, and DC-DC converters. Gate drivers are key components of PMICs that provide high-voltage switching, isolation, and power conversion. The LM5112SDX is a four-channel gate driver designed to provide high-fidelity drive capability to a wide variety of MOSFETs and IGBTs.

Features of the LM5112SDX

The LM5112SDX is a single-chip four-channel gate driver with adjustable deadtime and non-overlap control. It is designed to drive medium to high voltage MOSFETs and IGBTs in a wide array of applications. It operates from 8V to 36V supply voltage and is compatible with 2V logic levels from VCC and VDD. The LM5112SDX offers tight system control with deadtime and non-overlap control that is adjustable by the external resistors. It also offers fault protection for the overcurrent, short-circuit and thermal shutdown and is compatible with automotive temperature range (-40°C to +125°C) and can also optionally be specified for an extended temperature range (-55°C to 150°C).The features of the LM5112SDX are:

• Four-channel gate driver
• Wide operating voltage range: 8V to 36V
• Tight system control deadtime and non-overlap control
• Versatility to cover a wide range of applications
• Fault Protection for overcurrent, short-circuit and thermal shutdown
• Automotive temperature range (–40 C to 125 C) and extended temperature range(-55C to 150C)

Applications of the LM5112SDX

The LM5112SDX can be used in a wide variety of applications due to its high-speed switching capability. Its adjustable deadtime and non-overlap control makes it ideal for applications such as:

• DC-DC Buck and Boost regulators in non-isolated type converters
• Motor drivers for BLDC, AC, and DC motors
• DC-AC inverters for high power solar applications
• LED drivers for lighting and backlight applications
• Switched-mode power supplies (SMPS)
• Relay and solenoid drivers in automotive and machinery applications

Working Principle of the LM5112SDX

The LM5112SDX operates by providing the necessary gate drive signals to the power MOSFETs and IGBTs. It uses a two-stage high gain amplifier circuit to build up a drive current between the output and control pin of the MOSFETs and IGBTs. The two-stage amplifier takes a low-level digital input signal and amplifies it to a level suitable for driving the semiconductor. The LM5112SDX also has deadtime and non-overlap control features which are crucial for proper functioning of the gate drive circuit when driving IGBTs and MOSFETs. The deadtime control feature sets the minimum time between the rise and fall of both the high side and low side gate drive signals of each channel. This ensures that one switch does not turn on before the other is completely open. The non-overlap control feature prevents the positive and negative gate drive signals from becoming opposite in value at any point in time. It does this by adjusting the timing of the gate signals such that the positive and negative signals do not overlap. Finally, the LM5112SDX also offers fault protection such as overcurrent, short-circuit and thermal shutdown. This added protection backup ensures that the system is not damaged if one of these faults were to occur.

Conclusion

The LM5112SDX is a highly versatile four-channel gate driver designed to provide the needed control and protection when driving high-power MOSFETs and IGBTs. It has adjustable deadtime and non-overlap controls, as well as fault protection features, which makes it suitable for a wide variety of applications ranging from DC-DC regulators to LED drivers and relay drivers. It is an ideal choice for automotive applications as it supports both automotive temperature range and extended temperature range.

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