SM72485MME/NOPB Integrated Circuits (ICs)

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Introduction

The SM72485MME/NOPB is a chip-scale DC-DC synchronous step-down regulator from Texas Instruments. It is a low quiescent current switching regulator, intended for portable electronics, such as notebook computers and barcode scanners. It operates from an input voltage ranging from 4V to 24V and provides an adjustable output voltage as low as 2V. It also provides a very high efficiency of up to 95%.

Features

• Wide input voltage range - 4V to 24V
• High efficiency up to 95%
• High switching frequency up to 1.2MHz
• Low quiescent current of only 1.3mA
• Adjustable output voltage range - 0.6V to output voltage
• 2.5mV line regulation
• Soft-start for inrush current control
• Thermal shutdown
• Output current limitation

Application Fields

The SM72485MME/NOPB switching regulator is suitable for powering low-power general purpose applications such as barcode scanners, electronic wallets, notebook computers, and other low-power electronic devices. The wide input voltage range and high efficiency make it suitable for applications that require power from a battery, such as wireless sensors and wearable devices. In addition, due to its very low quiescent current, it is suitable for applications that need to maintain low current consumption over long periods of time, such as in standby mode.

Working Principle

The SM72485MME/NOPB is a synchronous step-down switching regulator. It operates from an input voltage ranging from 4V to 24V and can provide output voltages as low as 2V. The output voltage is adjustable by varying the resistance of an external resistor connected to the VADJ pin.

The block diagram of the SM72485MME/NOPB is shown in Figure 1. The voltage regulator includes an input voltage detector, an error amplifier, and a gate drive circuit, a power MOSFET, and an output voltage feedback divider. The power MOSFET is controlled by the current limit and ramp circuitry, which is driven by the gate drive circuit. The switching frequency of the power MOSFET is determined by the current limit and ramp circuitry. The error amplifier acts as the regulating circuit, comparing the output voltage with a reference voltage and applying the proper feedback voltage to the MOSFET gate.

The power MOSFET is switched between saturation and cutoff regions according to the voltage at the gate. When the voltage is high, the MOSFET is saturated. When the voltage is low, the MOSFET is cut-off. During the switch/clamp cycle, the inductor current increases linearly, charging the output filter capacitor, and providing the output voltage. When the switch is opened, the output voltage is regulated by the feedback loop, which compares the output voltage with the internal reference voltage and generates a proper gate voltage for the power stage.

Conclusion

The SM72485MME/NOPB is a chip-scale DC-DC synchronous step-down regulator from Texas Instruments. It can operate from a wide range of input voltages, and provides a very high efficiency of up to 95%. The device also has a very low quiescent current, making it suitable for applications that need to maintain low current consumption over long periods of time, such as in standby mode. The device is suitable for powering low-power general purpose applications, such as barcode scanners, electronic wallets, and notebook computers.

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