LM10010SDX/NOPB

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Power management devices are an important part of electronic devices, allowing for efficient and effective power management. The LM10010SDX/NOPB is a specialized power management integrated circuit (PMIC) from Texas Instruments, designed to deliver high efficiency power management in applications such as motor drives, digital audio amplifiers, and multi-channel class-D and bridged amplifiers. This article will discuss the application field and working principle of the LM10010SDX/NOPB.

Features

The LM10010SDX/NOPB is an advanced and flexible device with multiple features. Some of its notable features include:

• High efficiency (up to 90%)
• Wide input voltage range (2V to 36V)
• 30 mΩ low RDS(ON) high-side power MOSFETs
• 200 ns minimum allowance for deadtime
• Internal bootstrap diode to minimize additional external components
• Fully configurable for both single-ended and push-pull topologies
• Integrated overload protection and over-temperature protection

The LM10010SDX/NOPB is available in a thermally enhanced thermally enhanced HV-SOP-20 package.

Applications

The LM10010SDX/NOPB is designed for motor drive applications. In particular, it can be used in high-efficiency, low-noise switching-mode regulated applications such as hard drives, fan controllers, motors, and DC-DC converters. It can also be used in multi-channel class-D and bridged audio amplifiers, as well as digital audio amplifiers.

The LM10010SDX/NOPB is ideal for high current applications, such as in battery operated systems. Its integrated bootstrap diode allows for the operation of the device without additional external components, while the wide input voltage range allows the device to be used in applications with input voltages ranging from 2V to 36V.

Working Principle

The LM10010SDX/NOPB is an integrated circuit which contains two independent channels with identical features. Each channel consists of an advanced high-side power MOSFET and a low-side power MOSFET, as well as current sensing circuitry, fault protection circuitry, and a linear mode controller. Each channel also contains a pulse-width modulated (PWM) compensation network and a digitally controlled oscillator (DCO). The DCO is responsible for producing the PWM switching waveform and synchronizing both channels.

The LM10010SDX/NOPB works in a cycle consisting of four steps:

1. When the high-side MOSFET is activated, the current flowing through the device increases, and the resulting voltage drop across the current sensing resistor is detected by the controller. This voltage is compared against the reference voltage, and the difference is used to calculate the amount of current to be supplied.
2. The current is then fed to the DCO and the PWM compensation network, which converts the current into a PWM control signal.
3. This PWM control signal is then used to control the high-side and low-side MOSFETs. The output voltage of the circuit is determined by the duty cycle of the PWM control signal.
4. The cycle is then repeated, with the high-side and low-side MOSFETs being switched off and on, respectively, in order to maintain the output voltage.

The LM10010SDX/NOPB also includes a feedback loop which allows for additional fine-tuning of the output voltage. This feedback loop uses a voltage sense resistor which measures the output voltage of the circuit. The measured voltage is then compared to a reference voltage and the difference is used to adjust the duty cycle of the PWM control signal.

Conclusion

The LM10010SDX/NOPB is a specialized PMIC from Texas Instruments designed for use in motor drive applications and multi-channel class-D and bridged audio amplifiers. Its features, such as its high efficiency, wide input voltage range, low RDS(ON) high-side power MOSFETs, and integrated overload and over-temperature protection, make it an ideal choice for these applications. The device operates by using a four-step cycle in which an advanced high-side and low-side power MOSFETs, a PWM compensation network, and a digitally controlled oscillator work together to regulate the output voltage of the circuit. Finally, a feedback loop is used to fine-tune the output voltage.

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