LM5035SQ Integrated Circuits (ICs)

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The LM5035SQ is a highly integrated monolithic control circuit specifically designed for integrated circuits (IC) switching mode power supply. It is an excellent choice for a variety of applications, from a simple step-down (buck) DC/DC converter to more complex topologies, such as flyback, forward, and push-pull. This application field and its working principle make it very valuable for a wide range of applications.

Overview of LM5035SQ

The LM5035SQ is a high-performance buck or step-down integrated circuit regulator optimized for high-efficiency performance and low standby power consumption. It is an 18-lead plastic small-outline integrated circuit (SOIC) packaged device with an operating junction temperature range of -40°C to 125°C. The device is available with fixed output voltages of 5V, 8V, 9V, 10V and 12V.

The LM5035SQ includes an input under-voltage-lockout (UVLO) circuit, adjustable current limit, shutdown current limit, programmable slope compensated soft-start and a high-side N-Channel MOSFET switch. The UVLO is adjustable to allow operation of the device in a wide range of input voltages and power supply applications. The adjustable current limit protects the device from overloads and over-temperature conditions.

The LM5035SQ also features programmable adjustable frequencies from 500kHz to 2.3MHz, as well as a programmable high side switch delay. The output voltage of the device can be adjusted using an external voltage divider. The device requires a minimum of 10 external components to ensure proper operation and optimize device performance.

Working Principle

The LM5035SQ is a switching regulator, which works by rapidly switching an output transistor on and off to regulate the output voltage. This is accomplished by a voltage control loop that senses the output voltage and then adjusts the switching frequency to maintain the desired voltage.

The LM5035SQ has a synchronous rectifier, which allows current to flow in both directions through the output transistor. This allows the regulator to be more efficient due to a reduce in switch losses.

The device features a fixed frequency, peak current mode control algorithm, which allows for a fast transient response and good line and load regulation. The output voltage can be adjusted using an external voltage divider. The switching frequency of the regulator is internally set, but can be adjusted externally by an external resistor.

Applications

The LM5035SQ is an ideal choice for applications that require a high level of efficiency, such as notebook computer and tablet power supplies, LCD and plasma displays, inverters and motor drives, CPU and GPU core power supplies, and telecom/networking systems.

The device can also be used in more complex architectures, such as phase-shifted full-bridge and active clamp forward converters, as well as flyback converters. The device can also be used for AC-DC or DC-DC applications.

The LM5035SQ can be used with smaller form factor, and the device has been optimized to minimize the number of external components required for proper implementation. It features programmable features, such as switching frequency, high-side switch ramp, and output voltage.

Conclusion

The LM5035SQ is a high-performance monolithic control circuit from National Semiconductor specifically designed for integrated circuit (IC) switching mode power supply applications. The overall design is optimized to achieve excellent efficiency levels and low standby power consumption. The device offers a wide range of applications, from a simple step-down (buck) DC/DC converter to complex topologies, such as flyback, forward, and push-pull. The high-level performance and integrated features make the LM5035SQ an ideal choice for a variety of switching power supply applications.

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