LM2734ZQMKE/NOPB

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LM2734ZQMKE/NOPB is a DC-DC synchronous step-down switching regulator controller that provides the ability to generate a regulated output voltage from a wide input supply range. It is designed to offer a power saving solution for a wide variety of applications, such as solar inverters, LED lighting, point of load (POL) converters, as well as automotive. In this article, we will take a look at what features an application field offered and its working principle.

Application fields

The LM2734ZQMKE/NOPB has an adjustable output voltage that can be set over a wide range, from 0.8 to 6 V. It also features a flexible 225 kHz switching frequency range, allowing designers to find an optimal blend of efficiency and size. Its high efficiency of up to 95% allows the use of tiny inductors and small capacitors, minimizing system complexity and BOM costs, while simplifying design and achieving small solution sizes.

Furthermore, the LM2734ZQMKE/NOPB is designed to help meet automotive requirements, such as EMI and surge protection allowing for a wide operating temperature range from -40 to +150°C with full power delivery. The device also features a 2 A dual N-channel synchronous MOSFET with an enable/shutdown/reset, allowing for power sequencing, tracking and sequencing.

The LM2734ZQMKE/NOPB can be used in a variety of applications such as automotive, set-top boxes, point-of-load (POL) regulation for computer and peripherals, solid state lighting and lighting, solar inverters, battery charging, UPS systems, ac/dc wall adapters and general-purpose DC/DC converters.

Working Principle

The LM2734ZQMKE/NOPB is based on a synchronous step-down converter topology, which is designed to offer high efficiency, improved transient performance, and excellent thermal performance for applications requiring high current at low voltage output. The device features an integrated constant frequency current mode control, which results in a stable loop response to transient loads, enabling designer the use of external components that can satisfy the design need.

The LM2734ZQMKE/NOPB includes an external clock input that pushes inward the peak current limit and sets the external soft start loop gain. In order to ensure a stable loop response, a high frequency integrator is included in the loop design. The device also includes a 0.8 to 6 V adjustable output, and a high switching frequency range configurable up to 200 kHz.

The LM2734ZQMKE/NOPB provides overload protection and over current protection, ensuring an optimum protection of the system from power overloads. The device further offers an adjustable soft start that allows for a safe and controlled switch on time for the system coupled with an adjustable input current limit for each phase of the regulator circuit.

Ultimately, the LM2734ZQMKE/NOPB provides the ability to generate a regulated output voltage from a wide input supply range. It offers a wide range of features that allow designers to minimize system complexity and minimize BOM costs, while providing the reliability and performance required in order to meet most application needs.

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