IMH3AT110

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IMH3AT110 Application Field and Working Principle

The IMH3AT110 is a pre-biased, grown-junction shallow-trench isolation (STI) bipolar transistor array integrated circuit (IC), specifically developed to control late stage power in audio amplifiers and other similar power management applications. This device is primarily intended for use in automotive, consumer electronics and battery powered portable audio applications.

Features

• Low Operating Current (3.3mA)
• Low Standby Current (1μA)
• Minimum On-Resistance (7.2 Ohm)
• High Immune To Short Circuit Conditions
• High ESD Performance

Application Field

The IMH3AT110 is designed for use in audio amplifier and power management applications, typically operating within the range of 9V~20V. Such applications, due to their varied nature, present different challenges to the system designer, requiring features that can withstand high peak currents and a wide range of system voltages. The IMH3AT110 has been developed to provide a single, easy to use and cost effective solution that can be tailored to meet the challenging requirements of these applications.

Package

The IMH3AT110 is offered in the SMD SOIC-16L (D-IPAS) package, which is a low cost, lead-free, surface mountable solution. It has a maximum dimension of 7.5 mm x 11.7 mm and offers excellent thermal dissipation, enabling use in power management applications.

Working Principle

The IMH3AT110 is a pre-biased, grown-junction shallow-trench isolation (STI) bipolar transistor array integrated circuit (IC). It is designed to control late stage power in audio amplifiers and other similar power management applications. It consists of an array of six N-channel MOSFETS connected in parallel, with each MOSFET switching current in the same direction.

The IC is powered by a pre-set voltage applied across its drains, with the voltage set to match the application’s requirement. This pre-set voltage allows the user to control the amount of current passing through the IC, enabling it to operate within safe voltages and current limits.

The array of MOSFETs can either be activated in an independent or a common mode. In an independent mode, each MOSFET is activated by its own control signal. This enables the user to control the amount of current passing through each individual MOSFET, enabling the user to customize the current flow to the exact requirements of the application. In a common mode setup, a single control signal is used to activate the entire array, thereby allowing the user to control the amount of current passing through the entire array.

The bipolar transistor array comprises of six N-channel MOSFETs, each with its own gate terminal. A differential amplifier is used to amplify the input current, while the output stage consists of a pair of complementary MOSFETs. The amplifier stages combine to form a low noise, high speed differential circuit, which is then filtered and amplified to provide the desired amount of current for the target application.

The IMH3AT110 is designed for use in a wide range of audio amplifiers, power management applications, and automotive, consumer electronics and battery powered portable audio. Due its versatility, low operating and standby current, minimum on-resistance and high ESD performance, this IC offers a cost effective solution for power management applications.

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