LM5109MAX/NOPB

Current - Peak Output (Source, Sink):	1A, 1A
Base Part Number:	LM5109
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Rise / Fall Time (Typ):	15ns, 15ns
High Side Voltage - Max (Bootstrap):	118V
Input Type:	Non-Inverting
Series:	--
Logic Voltage - VIL, VIH:	0.8V, 2.2V
Voltage - Supply:	8 V ~ 14 V
Gate Type:	N-Channel MOSFET
Number of Drivers:	2
Channel Type:	Independent
Driven Configuration:	Half-Bridge
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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LM5109MAX/NOPB PMIC - Gate Drivers

The LM5109MAX/NOPB is a high-speed, high-current gate driver optimized for three-phase brushless dc (BLDC) motor drives. This gate driver is designed to drive two high-side and two low-side power MOSFETs in a half-bridge configuration with peak output currents of 1.7 A/2 A and switching frequencies up to 1 MHz. It provides superior performance slew rate and jitter control at high frequency switching applications, while minimizing power dissipation. Furthermore, the LM5109MAX/NOPB’s high output current capability allows for the use of large MOSFETs with lower RDSon, potentially reducing overall system cost and power dissipation. The device features a built-in start-up circuit for driving gates directly from a power supply, eliminating the need for external startup circuitry.

Applications

The LM5109MAX/NOPB PMIC - Gate Drivers can be used in a variety of motor control systems, including inverters, converters, and power supplies. Its high output current, wide input voltage range (4.5 V to 26 V), fast switching speeds, and excellent jitter tolerance make it ideally suited for applications in automobiles, industrial and consumer motor drives, and automated equipment.

Working Principle

The LM5109MAX/NOPB PMIC - Gate Drivers operates in two modes: voltage-mode and current-mode. In voltage-mode operation, the gate driver output voltage is adjusted to a level that optimally drives the MOSFETs at the desired switching frequency. This mode is best used when driving high-speed MOSFETs with a low gate threshold voltage (VGS) to ensure optimal switching performance. In current-mode operation, the gate driver adjusts the current through the MOSFET gates to achieve the desired switching frequency. This mode is ideal for high-power and high-temperature applications, as it ensures the gate drivers neither over-drive nor under-drive the MOSFET gates.The LM5109MAX/NOPB’s patented high speed circuitry reduces the gate charge needed to turn on the MOSFETs, resulting in a faster rise and fall times. This reduces the losses associated with the MOSFETs and minimizes the impact of parasitic inductance and capacitance. Additionally, the device features programmable slew rates for both high- and low-side drivers to further minimize switching losses and minimize EMI. The LM5109MAX/NOPB includes a thermal shutdown feature, configured with a threshold of 165°C. This safeguard helps protect the device from prolonged, uncontrolled operation due to excessive power dissipation. In addition, the device includes a programmable dead-time generator that helps reduce shoot-through currents in the dual-channel power stage and increases overall reliability. The LM5109MAX/NOPB is offered in a tiny 8-lead VSOF package and is fully RoHS-compliant. With its high robustness, high-speed performance, and low power dissipation, the LM5109MAX/NOPB offers an unmatched level of performance and value for any three-phase brushless dc motor drive application.

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