LM3676SDX-1.5/NOPB

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The LM3676SDX-1.5/NOPB is a high efficiency, low noise DC to DC synchronous step-down switching regulator and is part of the DC to DC product line from Texas Instruments. It is one of the many voltage regulators in the DC to DC Switching Regulator family of products. This regulator is an ideal choice for applications that require a wide input voltage range and high efficiency. It is also suitable for point of load applications such as high performance FPGAs, microprocessors, and other power hungry devices.

The LM3676SDX-1.5/NOPB voltage regulator feature a synchronous rectifier design with power MOSFET switches to provide high efficiency with low input and output ripple, even under light load conditions. The regulator operates in buck, boost, and buck-boost modes. It also supports Power Good and Current Limit. The LM3676SDX-1.5/NOPB utilizes a novel one-time enabling logic to control the switching regulator and for an optimized sleep mode operation.

The main features of the LM3676SDX-1.5/NOPB DC to DC Switching Regulator include:• Low Noise: By utilizing an internal soft-start controller, the device allows for a controlled start-up without requiring external capacitors.• Wide Input Voltage Range: The device can be operated from a 5 V to 24 V input voltage range.• High Efficiency: The device has low quiescent current (<100 µA) and high efficiency (>90%) operation.• Soft-Start: A soft-start feature helps reduce the in-rush current during start-up, enabling power savings and system stability.• Power Good: An integrated comparator monitors the input and output voltages and produces an active-low Power Good signal whenever the output voltage is within the preset range.

The working principle of the LM3676SDX-1.5/NOPB DC to DC Switching Regulator is based on the idea of cyclically switching between a buck and boost modes. The device contains two power MOSFETs and a PWM controller. The PWM controller is used to control the switching of the FETs, so that the output voltage is regulated. The voltage divider is used to sense the output voltage of the regulator, and a voltage comparator is used to compare the output voltage with a reference. The reference is used to set the desired output voltage of the regulator.

When the output voltage rises above the set value, the controller turns on the buck switch and turns off the boost switch. This causes the output voltage to decrease to its correct level. Similarly, when the output voltage is below the set value, the boost switch is turned on and the buck switch is turned off, and the output voltage rises to the correct level. The PWM controller controls the switching of the FETs such that the output voltage remains at the desired set value.

The LM3676SDX-1.5/NOPB DC to DC switching regulator is well-suited for applications such as general power supplies, computing applications, consumer electronics, battery chargers, medical equipment, industrial systems, LED lighting, and automotive systems. It is available in a small, space-saving SOT223-5 package, and is fully RoHS compliant. The device has a wide operating temperature range of -40°C to 85°C.

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