LM5109ASDX/NOPB

Current - Peak Output (Source, Sink):	1A, 1A
Base Part Number:	LM5109
Supplier Device Package:	8-WSON (4x4)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Rise / Fall Time (Typ):	15ns, 15ns
High Side Voltage - Max (Bootstrap):	108V
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:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LM5109ASDX/NOPB is a high voltage Power Management Integrated Circuit (PMIC) Gate Driver. It is designed to provide high performance, pulse-width modulation (PWM) and linear current controlled switching gates. It is composed of high voltage NMOS/PMOS power transistors, driving circuits, MOSFETs, protection circuits and gate control circuits.

Features

The LM5109ASDX/NOPB offers many features, including:• High voltage operation up to 800V.• Independent gate drive for high and low side MOSFETs.• Programmable slew rate, gate turn-on time, and gate turn-off time.• On-board over-voltage, over-temperature and under-voltage protection.• Fast switching times and low losses.• Low-loss driving of high capacitive/inductive load.• Low standby current when operating from batteries or low-power DC/DC regulators.

Application Fields

One of the main application fields for the LM5109ASDX/NOPB is for driving high-voltage power WLEDs. The LM5109ASDX/NOPB can be used to regulate the current and voltage for the WLEDs and extend their lifespan.The LM5109ASDX/NOPB can also be used for motor control in low-voltage industrial applications. It is capable of controlling power transistors to actuate AC, stepper and brushless motors.The LM5109ASDX/NOPB can also be used in stationary power converters and dc/dc converters.

Working Principle

The LM5109ASDX/NOPB operates by using high voltage NMOS/PMOS power transistors to drive the gates of the MOSFETs. The gate control circuit is configured with a resistive divider to program the gate voltage. The gate voltage is then shaped and amplified by a driver circuit to drive the MOSFETs.The LM5109ASDX/NOPB can be configured to operate in either pulse-width-modulated or linear current controlled switching modes. In PWM mode, the duty cycle of the output can be adjusted by adjusting the gate voltage. In linear controlled switching mode, the desired current is set by adjusting the gate voltage. The LM5109ASDX/NOPB also features built in over-voltage, over-temperature, and under-voltage protections.

Conclusion

The LM5109ASDX/NOPB is a PMIC – Gate Driver designed to provide high performance, pulse-width modulation (PWM) and linear current controlled switching gates. It can be used in applications such as WLEDs, motor control, stationary power converters and dc/dc converters. It operates by using a high voltage NMOS/PMOS power transistors to drive the gates of the MOSFETs, and can be configured to operate in either PWM or linear controlled switching mode. It also features on-board over-voltage, over-temperature, and under-voltage protection.

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