LB1948MC-AH

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Power management integrated circuit (PMIC) has been widely used as one of the convenient solutions in the current electronics industry. PMIC - Motor Drivers, Controllers are designed particularly to control the current of motors which can help to reduce the complexity of circuit designs in various applications. LB1948MC-AH is one of the most popular power management ICs, targeting at the automotive industry.¹

The LB1948MC-AH integrates various power control circuits, including a pre-regulator, a PWM controller, two high-side N-channel MOS driver circuits, and a DMOS output power stage. It is suitable for high-current, high-side gate drivers in several automotive applications, specially for DC servo motors for windows or seat adjustment.²

To better understand the application of the LB1948MC-AH, we need to look into the specific features and module blocks it has. It provides a low on-resistance DMOS power stage with a peak current up to 6A. Through the onboard PWM controller, it supplies a high-accuracy voltage pre-regulator with a precision of ±1.25%. Moreover, it includes a built-in under-voltage lock detector with a low voltage margin. The whole circuit shows a highly reliability as the built-in over-current/short-circuit protection prevents the output stage from malfunctioning.³

Hence, the main purpose of LB1948MC-AH is to drive the motors, mainly DC servo motors, for windows and seats closures in the automobile industry. The LB1948MC-AH operates under a single supply up to 26V and the output high-side gate driver primarily performs the two complementary signals to drive the motor. It is externally adjustable, which provides flexibility to the circuits (e.g. switch between PWM and PWM-less modes).²

To sum up, the LB1948MC-AH is specifically design to control the current supplied to the motors while greatly improving its performance. With its pre-regulator, N-channel MOS driver, and DMOS output stage, it provides a highly reliable circuit design with a wide range of applications.

References:
1. LB1948MC-AH | ON Semiconductor
2. LB1948MC-AH Automotive High-Side Driver
3. LB1948MC-AH Automotive High-Side Driver

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