LM2694SDX

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Introduction

LM2694SDX is a high-efficiency, monolithic buck converter available in a 4 mm × 4 mm QFN package. This device is designed for a wide range of applications that require low voltage, low power, and high efficiency. It is a series of adjustable and fixed output buck regulators from National Semiconductor Corporation. It combines high efficiency, fast transient response, small external component count and simple design into a small and cost effective package. The LM2694SDX is a coupled inductor based switched mode DC-DC converter with an integrated controller and MOSFETs. It is highly optimized to deliver greater than 90% efficiency over the full load range.

Applications

The LM2694SDX is suitable for a wide range of applications, including portable systems, computer peripherals, and data acquisition systems. Specifically, it is designed to provide high precision step-down conversion from a wide input voltage range (3.3V to 17V) to a 1.2V to 6V output voltage range. The device also offers high efficiency (greater than 90% typical), fast transient response, low no load input current (19uA maximum), and adjustable output voltage accuracy to within 1% for fast and accurate system performance. The device is also ideal for use in applications requiring high accuracy, low noise, low EMI, and low ripple such as automotive, telecommunications and medical systems.

Features

The LM2694SDX features an integrated PWM controller and two external N-channel MOSFETs for high efficiency and fast transient response. It is capable of delivering up to 500mA total output current. The device also offers a wide variety of protection features, including overvoltage protection (OVP) with fully programmable levels, undervoltage protection (UVP), overcurrent protection (OCP), and current-limit protection (CLP). In addition, this buck regulator is capable of dynamic voltage scaling and soft-start operation, as well as PWM dimming capability.

Working Principle

The LM2694SDX buck regulator works by converting a high input voltage (VIN) to a lower, regulated output voltage (VOUT). The input voltage is applied to the primary side of an electrical transformer, which increases the voltage to a higher voltage on the secondary side. The high voltage is then fed through a switch (control transistor) which is modulated by a Pulse Width Modulator. The PWM signals the switch to turn “on” and “off” in a controlled pattern, creating a sawtooth-like waveform at the output. This sawtooth waveform is then conditioned to provide a near-constant output voltage. The device uses an internal PWM to control the output voltage, which can be adjusted from 1.2V to 6V by using an external resistor divider.

Conclusion

The LM2694SDX is a high-efficiency, monolithic buck converter designed to provide step-down conversion from a wide input voltage range to a 1.2 to 6V output. It is widely used in a variety of applications ranging from portable systems, computer peripherals, and data acquisition systems. It features a high level of integration, high efficiency, fast transient response, and advanced protection features. In addition, this buck regulator is capable of dynamic voltage scaling and PWM dimming. The LM2694SDX is an ideal solution for applications requiring high efficiency and fast response time.

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