I. Industry Background and Solution Value

Currently, battery-powered power tools are evolving towards high performance, miniaturization, and intelligence, while the industrial sector increasingly demands autonomous supply chain control. Traditional solutions rely on imported components, facing supply fluctuations and cost pressures, and struggle to meet performance requirements for new applications such as brushless motor control and high-precision signal acquisition.

Against this backdrop, Corebai has introduced a full-chain domestic solution covering power management, signal acquisition, and processing. Centered on its self-developed industrial-grade chips, the solution precisely addresses the needs of electric tool performance upgrades, supply chain security, and miniaturization design, providing reliable domestic alternatives for selection engineers and B-end clients.

II. Program Overview

This solution addresses industrial control requirements for battery-powered power tools (including rechargeable drills, angle grinders, and impact wrenches) by delivering a comprehensive domestic solution covering power management, signal acquisition and processing, and motor control drives. Built on Corebai's proprietary power management chips (DC-DC converters and LDO regulators) and operational amplifier (OPA) series, the solution strictly adheres to industrial-grade reliability standards. It effectively meets core operational demands in battery-powered applications, complex working environments, and high-precision signal acquisition scenarios, while ensuring full autonomy in critical component control.

III. System Architecture and Functional Analysis

The solution is divided into three major modules: power management, signal acquisition and processing, and control and drive. The functional compatibility and component matching for each module are as follows:

1. Power Management Module

1) Core functions: Enables battery charge/discharge management, converts battery voltage to stable operating voltage required by system components, and provides reliable power supply for MCU, signal chain, and motor drive circuits.

2) Component selection:

l The CBM2576HV (High-Voltage DC-DC Step-Down Converter) serves as the primary step-down device on the battery side, reducing high-voltage battery voltage to the medium voltage level required for motor drive and control circuits.

l The CBM317 (Adjustable LDO Linear Regulator) functions as a secondary voltage regulator, delivering low-noise, high-precision regulated output for analog/digital circuits including MCUs, operational amplifiers, and sensors.

2. Signal Acquisition and Processing Module

1) Core functions: Amplify and process three critical analog signals—battery voltage, motor current, and motor speed/position—to provide precise feedback data for the MCU.

2) Component selection:

l OPA1 (Battery Voltage Acquisition): A low-power, wide-temperature operational amplifier is selected to achieve high-precision amplification of battery voltage signals, enabling power monitoring and over/under-voltage protection.

l OPA2 (Motor Current Acquisition): A high-precision operational amplifier with low offset voltage and zero drift is employed to amplify the motor current signal sampled by resistors, serving for overcurrent protection and torque control.

l OPA3 (Motor Speed/Position Acquisition): A low-noise, fast-response operational amplifier is employed to process digital pulse signals from motor Hall sensors or encoders (excluding analog back electromotive force detection scenarios), providing real-time feedback for closed-loop speed control.

3) Optional OPA series: CBMLM358, CBMV321, CBM600X, CBM862X, and CBMV72X, with flexible model selection based on requirements for precision, power consumption, and bandwidth.

3. Control and Drive Module

1) Core function: The MCU generates PWM signals based on collected signals and user inputs, and controls the motor's speed and torque through the power drive circuit.

2) Device synergy: The power management device provides stable power supply for the MCU and driver circuit, while the signal acquisition module delivers real-time feedback data to the MCU, enabling efficient and precise motor control.

IV. Core Device Parameters and Selection Criteria

1. Power management device

l CBM2576HV High-Voltage DC-DC Step-Down Converter

Application scenario: The battery's high-voltage side is stepped down to provide medium-voltage high-current power supply for motor drives and control boards, replacing traditional linear regulators for efficient power delivery.

l CBM317 Adjustable LDO Linear Regulator

Application scenario: The DC-DC converter performs secondary voltage regulation after step-down conversion, delivering precise power supply to low-noise analog/digital circuits such as MCUs, operational amplifiers, and sensors.

2. Operational Amplifier (OPA) Series

To address the three core signal acquisition requirements for power tools, Corebai Micro offers multiple series of OPA products, enabling flexible selection based on performance and cost considerations.

Selection criteria:

l Battery voltage acquisition: Prioritize low-power, wide-temperature operational amplifiers (OPAs) such as CBMV321 and CBM600X to ensure long-term stability in power monitoring.

l Motor current acquisition: Prioritize zero-drift, high-precision, and low-offset operational amplifiers (e.g., CBM600X) to ensure sampling accuracy for overcurrent protection and torque control.

l Motor speed/position acquisition: Low-noise, fast-response OPA (e.g., CBM862X, CBMV72X) is recommended to meet digital pulse signal conditioning requirements; high-speed OPA is required only for analog back electromotive force detection scenarios.

4、Core advantages of the solution

1. Industrial-grade high reliability

l The core components support industrial-grade wide temperature range from-40°C to 125°C (with CBM317 junction temperature up to 150°C), making them suitable for complex operating conditions including outdoor environments, extreme temperatures, and vibration exposure.

l The system incorporates multiple protection mechanisms including built-in overheat, overcurrent, and thermal overload protection, effectively reducing system failure risks and extending product lifespan.

2. Deep Optimization of Battery-powered Scenarios

Power management devices: The CBM2576HV high-efficiency buck converter combined with the CBM317 precision voltage regulator enhances power supply efficiency, reduces heat generation, and prolongs battery life; the CBM317's ultra-low noise output ensures analog signal acquisition accuracy.

Operational amplifier: The entire series features low-power design, with multiple products (CBMV321S, CBM862XS, CBMV72XS) supporting shutdown functionality (standby current ≤1μA) to meet battery-powered energy-saving requirements; rail-to-rail input/output design enhances signal dynamic range under low-voltage battery conditions.

3. Compact design for ease of use

Power management components: Only four peripheral devices are required for the CBM2576HV, while the CBM317 adopts TO-252/TO-263 surface-mount power packages, simplifying PCB layout and reducing overall device footprint.

Operational amplifier: Available in micro-sized packages including SOT23-5/6 and MSOP-8, with single, dual, or quad-channel configurations to further reduce PCB footprint, aligning with the trend toward miniaturization in power tool design.

4. Domestic alternatives

All core components of the solution are proprietary products developed by Corebai Micro, fully replacing imported counterparts (e.g., TI LM2576, LM317, and ADI's OPA series). This ensures supply chain security and aligns with the industrial trend of self-reliance and technological autonomy.

5、Typical application scenarios

Portable rechargeable power tools: including electric drills, angle grinders, impact wrenches, electric saws, and vacuum cleaners, designed to meet core requirements for battery-powered operation, portability, and high reliability.

Industrial-grade portable electric equipment: A professional tool application scenario requiring high motor control precision, extended battery life, and operational reliability under various conditions.