BD9740KN-E2

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BD9740KN-E2 Application Field and Working Principle

BD9740KN-E2 is a 3-terminal synchronous buck step-down Switching Regulator (PMIC Voltage Regulator) typically found in DC-DC applications for powering chip sets, VCOs, DSP and may more applications. This PMIC provides a range of electrical and thermal protection including over-current protection, over-voltage protection, input voltage under-voltage lockout and thermal protection. Additionally, far end dimming protection helps protect driven devices against damage by providing controlled soft-start.

Features:

• Integrated Control Logic and Gate Drivers
• Integrated TSFET output switch with 35V/28A
• Programmable voltage down to 0.6V
• Supports single or dual inductor applications
• Number of phases: Single
• Operating temperature up to 105C

Application Fields

BD9740KN-E2 is suitable for a wide range of switching supplies that are widely used in a variety of applications including automotive electronics, computing, microprocessors, communication systems and aerospace. Common applications include power supplies for voltage regulators, synchronous rectifier circuits, motor drives and more. The BD9740KN-E2 is also suitable for high-end gaming applications uses common contemporary graphics outputs (nVidia, etc).

Working Principle

BD9740KN-E2 is an integrated 3-terminal synchronous buck step-down Switching Regulator (PMIC Voltage Regulator) that works in buck-mode. It is operated in a Pulse-Width Modulation (PWM) mode, an efficient method to convert electrical power up or down. It features an input voltage range of 4.5V to 28V and an adjustable output voltage (V_OUT) down to 0.6V. An integrated control logic and gate drivers ensure robust and reliable operation.

When the input voltage is above the rated voltage, it enables the integrated driver circuit to switch the N-Channel power FET ON and OFF in order to regulate the output voltage (V_OUT). The regulation of V_OUT is done by controlling the duty cycle of the output switching signal from the gate driver. During the ON time (or “conduction period”), the power FET is switched on allowing the energy stored in its inductor to deliver energy to the output capacitor. During the off-time, the power FET is switched off and the current will flow through the inductor to the output capacitor until the voltage reaches its minimum level. This cycle is continuously repeated resulting in the regulated output voltage.

In conclusion, BD9740KN-E2 is a 3-terminal synchronous buck step-down switching regulator (PMIC voltage regulator) designed to meet the ever-tighter requirements of applications such as powering chip sets, VCOs, DSPs and far-end dimming protection. The integrated control logic and gate drivers ensure robust and reliable operation.

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