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Infineon BTN9970LV Integrated High Current Half-Bridge With Low Path Resistance For Motor Drive

Shenzhen Mingjiada Electronics Co., Ltd., as a professional electronic component supplier, now offers the Infineon BTN9970LV integrated high-current half-bridge driver. This innovative product belongs to the Infineon MOTIX™ NovalithIC+ series, specifically designed for high-demand motor drive applications. It integrates advanced technologies and protection features, making it suitable for various fields such as automotive electronics, industrial automation, and consumer electronics.

BTN9970LV Product Overview and Core Features

The BTN9970LV is an intelligent integrated half-bridge driver representing the latest advancements in motor drive technology. As a direct upgrade to the BTN89xx series, the BTN9970LV integrates a P-channel high-side MOSFET, an N-channel low-side MOSFET, and an intelligent driver IC into a compact PG-HSOF-7 package (7×8mm²), delivering a highly integrated solution. This innovative design not only significantly reduces PCB space (60% less than the previous generation) but also enhances system reliability, reduces the number of external components, and simplifies assembly complexity.

The most notable technical feature of the BTN9970LV is its extremely low path resistance. Thanks to Infineon's advanced MOSFET technology and innovative chip thinning process, the BTN9970LV achieves a typical path resistance of just 9.7mΩ at 25°C (maximum 18.1mΩ at 150°C). This represents a 47% reduction compared to the previous generation, translating to lower conduction losses and higher efficiency, making it particularly suitable for motor applications requiring prolonged operation. Lower path resistance directly translates to reduced heat generation, enabling the system to handle higher currents in the same size or achieve a more compact design at the same current.

The BTN9970LV's electrical parameters are equally impressive:

Wide voltage operating range: 8V to 18V (with a maximum transient voltage of 40V), perfectly suited for automotive 12V systems and industrial applications

High current drive capability: Peak output current up to 60A (minimum limit), meeting the needs of most small to medium-sized motor drives

Ultra-low static current: Maximum of only 3.3µA at 85°C, significantly reducing standby power consumption

Optimised switching characteristics: Offers eight selectable switching rates, enabling engineers to balance EMI performance and switching losses according to application requirements

Technical advantages and innovative design

The BTN9970LV half-bridge driver integrates multiple Infineon patented technologies, setting it apart in motor control applications. The device employs Infineon's NovalithIC+ technology, an advanced solution developed specifically for power integration. By achieving three-dimensional integration of high-side and low-side MOSFETs with the driver IC within a single package, it achieves unprecedented power density and performance levels. This high level of integration not only simplifies system design but also enhances reliability, as internal connections are shorter and more reliable than traditional PCB routing.

The design of the P-channel high-side MOSFET is a key highlight of the BTN9970LV. Traditional half-bridge designs using N-channel MOSFETs as high-side switches require additional charge pumps to provide sufficient gate drive voltage, which not only increases system complexity but may also cause electromagnetic interference (EMI) issues. The BTN9970LV addresses this issue perfectly with its P-channel high-side MOSFET—it achieves full switching operation without requiring a charge pump, thereby simplifying circuit design and reducing EMI. This innovation makes the BTN9970LV particularly suitable for automotive electronics and medical device applications sensitive to EMI.

In terms of thermal performance, the BTN9970LV employs Infineon's advanced chip stacking and packaging technology. The MOSFET chips inside the device undergo special thinning treatment, and heat is efficiently conducted to the package housing through an optimised thermal path design. The PG-HSOF-7 package itself has excellent thermal characteristics, enabling high power handling in a compact size. In practical applications, even under high load conditions, the BTN9970LV maintains a low operating temperature, thereby extending service life and enhancing system reliability.

Diagnostic and protection features are another key advantage that distinguishes the BTN9970LV from traditional discrete solutions. The device integrates comprehensive protection mechanisms, including:

Overcurrent protection: automatically shuts off when current exceeds the preset threshold (60A) to prevent device damage

Over-temperature protection: triggers shutdown when junction temperature exceeds the safe limit (typically 150°C)

Undervoltage lockout (UVLO): ensures no unintended operation occurs when power supply voltage is insufficient

Status indicator output: Provides current detection, temperature, and conversion rate feedback for system monitoring and fault diagnosis

All these protection functions are integrated within the chip, offering faster and more reliable response times compared to externally implemented protection circuits, significantly reducing system failure risks. For automotive and industrial applications, this built-in ‘self-protection’ capability is particularly crucial, significantly enhancing the overall system's robustness.

Typical Application Scenarios

The BTN9970LV half-bridge driver's versatility and high reliability make it an ideal choice for numerous motor drive applications. In the automotive electronics field, this device is particularly suitable for 12V brushed DC motor control systems, widely used in applications such as electric tailgates, sliding doors, seat adjustment, fuel pumps, and HVAC blowers. These applications share the common requirement of achieving high reliability and efficiency in motor control within limited space, which is precisely the design intent of the BTN9970LV. According to official data from Infineon, its predecessor series, the BTN89xx, has delivered over 500 million units globally in the automotive market since 2015, fully validating the maturity and reliability of this architecture.

In the industrial automation field, the BTN9970LV can be used in various electric tools, robot joint drives, conveyor belt motor control, and actuators in automated equipment. Its high current capability and comprehensive protection features enable it to handle various challenges in industrial environments, such as sudden load changes and frequent start-stop operations. Industrial users particularly value the BTN9970LV's PWM control capability, which supports a switching frequency of up to 20kHz (adjustable according to user requirements), enabling precise motor speed control.

Home appliances are another key application area for the BTN9970LV. Motor drive systems in white goods such as washing machines, refrigerators, and air conditioners can all benefit from this highly integrated half-bridge driver. In home appliance applications, the BTN9970LV's low static current characteristic is particularly valuable, helping products meet increasingly stringent energy efficiency standards. Additionally, its compact package size is ideal for space-constrained home appliance PCB designs.