LM5117QPSQ/NOPB

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The LM5117QPSQ/NOPB is a high voltage, 3-phase, synchronous buck controller with integrated high and low-side MOSFETs. It is typically used for automotive power train applications, providing a highly efficient power source for vehicle motors such as electric traction systems or hybrid vehicles. The integrated high and low side switches increase system design flexibility and reduce component count. The controller operates from an input voltage of up to 55V and provides a typical output voltage range of 0.5V to 18V with a maximum output current of 25A. The LM5117QPSQ/NOPB also offers programmable current limit and hiccup mode fault protection.

The LM5117QPSQ/NOPB has two operating modes, the run and the sleep mode. In run mode, the controller generates the synchronous PWM (SPWM) signal out of a fixed frequency clock and uses it to operate the power MOSFETs in a Buck converter. The controller generally follows the SPWM pattern, but it has the flexibility to adjust the switching frequency for improved system efficiency. A feature of the LM5117QPSQ/NOPB is that it allows the user to program the external components to produce a variable switching frequency. This feature avoids the need to redesign the external components when operating the system over a wide input voltage range. This allows the user to select the best operating frequency for each application.

The digital under-voltage lockout (UVLO) feature protects the device from out-of-range input conditions. A floating digital enable pin allows the controller to be enabled or disabled. When the enable pin is low, the controller is in sleep mode and no SPWM signal is produced. The sleep current is only 14µA at an output voltage of 18V.

The LM5117QPSQ/NOPB also features an adjustable current limit and hiccup mode. The adjustable current limit ensures that the system remains stable over a wide operating temperature range. In hiccup mode, the controller will latch off the power switches and restrict the current. The current limit is user programmable and is set through an external resistor or by using a logic signal.

The LM5117QPSQ/NOPB is a highly efficient, rugged and reliable DC-DC switching controller. It is designed to provide a stable voltage supply and can be used in a variety of automotive powertrain applications. It has integrated high and low-side switches, programmable current limit and hiccup mode fault protection, adjustable switching frequency, digital under-voltage lockout and a digital enable pin. It is easy to use and provides a high level of reliability and performance.

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