LTC4446EMS8E#TRPBF

Current - Peak Output (Source, Sink):	2.5A, 3A
Base Part Number:	LTC4446
Supplier Device Package:	8-MSOP-EP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Rise / Fall Time (Typ):	8ns, 5ns
High Side Voltage - Max (Bootstrap):	114V
Input Type:	Non-Inverting
Series:	--
Logic Voltage - VIL, VIH:	1.85V, 3.25V
Voltage - Supply:	7.2 V ~ 13.5 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 LTC4446EMS8E#TRPBF is an advanced power management integrated circuit (PMIC). It is designed to drive low on-resistance, low-ESR MOSFETs and IGBTs. This PMIC utilizes pulse-by-pulse current limiting, internal high-voltage start-up regulator, and soft-start to ensure circuit protection and optimal power performance. Moreover, this PMIC provides excellent thermal management, low RDS(ON), and low gate charge for efficient power delivery. This application note provides an overview of the LTC4446EMS8E#TRPBF, its application field, and its working principle.

Application Field

The LTC4446EMS8E#TRPBF is suitable for a wide range of applications from battery voltage monitoring, AC/DC converters, and DC/DC converter applications. This PMIC can be used in many automotive applications such as vehicle and electronic battery systems, motor speed control, motor current sensing and protection, fuel injectors, and AC/DC converters. This power management IC is also used in industrial applications to provide efficient power and protection. Its low RDS(ON) and low gate charge enables the power delivery to be optimized, while its soft start and over current protection functions allow the device to be thermally stable and reliable. Moreover, the LTC4446EMS8E#TRPBF is used in consumer applications such as portable media players and gaming consoles. Its space-saving SOT23-5 package allows it to be used in devices with limited space for power supplies. Its low-ESR and low RDS(ON) minimizes power loss, thus making it an ideal power management solution for consumer applications.

Working Principles

The LTC4446EMS8E#TRPBF is composed of three sections. The first section is the pulse-by-pulse current limit. This section provides a maximum current limit to the output of the power management IC. This limit is adjusted through an external resistor, thus allowing the user to customize the current limit as needed. The second section is the high-voltage start-up regulator. This section of the PMIC provides the initial voltage to the gate of the power device, ensuring that the device is able to start-up when the power is applied. The third section is the soft-start. This section helps the power device turn-on gradually by increasing the gate voltage over a certain period of time. This feature helps to eliminate any inrush current and make the device thermally stable. In addition, the PMIC also includes a thermal protection circuit which helps protect the device from any heat damage by shutting off the output if the device temperature reaches a predetermined level.

Conclusion

The LTC4446EMS8E#TRPBF is a advanced power management IC designed to provide low RDS(ON), low gate charge, over current protection, and thermal protection with a small form factor. Its application field covers a wide range of devices such as automotive, consumer, and industrial applications. Its working principles include a pulse-by-pulse current limit, high-voltage start-up regulator, soft-start, and thermal protection.

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