LM27342QMYX/NOPB

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LM27342QMYX/NOPB is a DC-DC switching regulator provided in a low profile, thermally-enhanced 3mmx3mm QFN package. This device offers an extended temperature range of –40°C to 125°C and supports up to an 18V input voltage range.

This device operates by controlling the duty cycle and frequency of an external switch. The duty cycle and frequency of the external switching regulator can be controlled with a single external resistor, providing flexibility in designing efficient DC-DC converter circuits. The device is protected from short-circuit, overtemperature and under-voltage conditions and utilizes a low noise and fast transient response for stable output voltage regulation.

The most common applications of LM27342QMYX/NOPB include automotive, industrial, mobile and consumer electronics. It can be used as a power supply for processors, ASIC/PLDs, FPGA cores and IGBT/MOSFET gate drivers. It is also suitable for power management of system cores in battery powered electronics, such as tablets, PCs and healthcare equipment.

The LM27342QMYX/NOPB DC-DC switching regulator works in three main modes. In discontinuous conduction mode (DCM) the input voltage current is discontinuous and flows through the inductor during each switch cycle, and in continuous conduction mode (CCM) the current is continuous and flows throughout the switch cycle. In burst mode operation (BMO) the regulator is operated in DCM from zero to maximum output current, and as the output current decreases the regulator switches to CCM to maintain the output voltage regulation.

The basic structure of LM27342QMYX/NOPB DC-DC switching regulator is composed of an inductor, a diode, an internal switch, a control circuit and a feedback circuit. The external switch is driven by a pulse width modulation (PWM) signal produced by the internal control circuit. The PWM signal is generated by comparing the feedback voltage against a reference voltage. The external switch is either connected directly to the input voltage or between the input voltage and the output voltage.

In order to control the output voltage, the feedback voltage is monitored using an external resistor divider network. The divider network supplies a low level feedback voltage to a comparator inside the regulator, which then drives the internal switch. The internal switch is used to control the on and off times of the external switch over an adjustable duty cycle range. As the duty cycle is changed, the output voltage also changes.

The LM27342QMYX/NOPB DC-DC switching regulator operates in two frequency ranges. In the normal operating range the switching frequency is set to a maximum of 1MHz, while in the low frequency operation range (LF) it is set to a maximum of 500kHz. The maximum duty cycle is adjustable from 0% to 100% for both frequency ranges, allowing for flexible and fine output voltage control.

The LM27342QMYX/NOPB DC-DC switching regulator is an efficient and cost-effective choice for applications requiring a low profile, small form factor switching regulator with an extended temperature range and an adjustable duty cycle. It is also ideal for applications that require up to 18V input voltage range and a power supply with low noise and fast transient response.

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