LM3488QMMX/NOPB

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The LM3488QMMX/NOPB is a monolithic synchronous buck dual-mode application field and working principle DC-DC controller with integrated MOSFETs. It is designed to easily provide several hundred milliamps of output current with efficiency using either forced continuous current-limit or synchronous pulse-width modulation (PWM) control. It is specifically designed to optimize power over a wide load and input voltage range. The controller is available in a thermally enhanced green 3mm x 3mm x 0.75mm QFN package.

The LM3488QMMX/NOPB is an application specific integrated circuit that combines integrated power MOSFETs, low-voltage/low-power driver, and current sense circuitry in one package. This controller takes a wide input voltage range, allowing it to be powered from a variety of sources. The LM3488QMMX/NOPB operates in either forced continuous current-limit or synchronous pulse-width modulation (PWM) mode, providing excellent line and load regulation with high efficiency. Additionally, load transient peak current limit and cycle-by-cycle current limit also ensures excellent protection against overload and short circuit without the need of an external current-sense resistor. As an integrated step-down (buck) converter, it operates with a maximum output voltage of 4V and a programmable switching frequency up to 1MHz.

The LM3488QMMX/NOPB consists of two pairs of independent power MOSFETs, each pair consisting of an NMOS and PMOS integrated control MOSFET. The two MOSFETs operate in parallel to reduce the power losses and lower the operating supply current. The two pairs of MOSFETs operate independently for higher output current applications and can be connected in series for applications requiring higher output voltage. The controller also includes two additional switching MOSFETs which are operated in the same manner as the main output switch. The extra switches provide additional current capability and reduce the output voltage.

The LM3488QMMX/NOPB uses an internal low-voltage/low-power driver to drive the NMOS and PMOS output MOSFET gates. The driver is designed to provide high efficiency and low quiescent current. This driver is typically used in buck converters operating at low switching frequencies. Additionally, the controller provides current sense inputs to detect load current as well as an external resistor which can be used to set the over-current limit. The LM3488QMMX/NOPB also features a programmable soft-start to guarantee a smooth output voltage rise time.

In summary, the LM3488QMMX/NOPB is a monolithic synchronous buck dual-mode DC-DC controller with integrated MOSFETs. It is designed to provide excellent line and load regulation with high efficiency and low quiescent current. The controller is ideal for a variety of applications from portable and telecommunications systems to computing and medical systems, making it a versatile and cost effective solution for power supply design.

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