company blog about Recycle ROHM Power Management Switch:High Side Switch,Load Switch,NMOSFET Controller

Recycle ROHM Power Management Switch:High Side Switch,Load Switch,NMOSFET Controller

Shenzhen Mingjiada Electronics Co., Ltd. has been deeply involved in the electronic chip recycling industry for many years. We have consistently adhered to the service philosophy of ‘integrity in business, high-value recycling, prompt settlement and complete confidentiality’, providing one-stop, high-value, transparent and efficient chip recycling and disposal services to clients including factories, enterprises, traders and R&D studios, helping businesses to utilise idle assets, clear inventory and reduce warehousing losses.

Key Advantages of Our Recycling Services

- Specialised segmentation, accurate quotations: Specialising in the recycling of electronic component chips, we have extensive industry experience and are well-versed in market conditions, condition standards and value differences across various models. Our quotations are accurate and transparent, with no hidden price reductions.

- Comprehensive Range of Recyclable Items: We accept chips in all conditions, including brand-new, original, packaged units; bare die stock; engineering samples; functional components from dismantled devices; obsolete stock; and expired remnants. There are no minimum quantity requirements; we accept single units, bulk orders and entire warehouse stocks.

- Efficient, Convenient and Rapid Payment: We support both photographic and physical inspection of goods, with swift quotation confirmation. For local clients, we offer on-site inspection and collection; for those in other regions, we arrange collection via courier. We monitor the entire process closely and settle payments immediately via bank transfer upon confirmation, with no delays.

- Reputable and reliable, with security and confidentiality guaranteed: We hold all necessary company qualifications and operate as a legitimate, physical business. We strictly adhere to electronic component recycling regulations, maintaining complete confidentiality regarding client inventory and partnership details throughout the process to eliminate the risk of material leakage and safeguard client interests.

- One-stop inventory clearance: We undertake services such as the clearance of entire warehouses of electronic components for enterprises, the disposal of project offcuts, and the revitalisation of dead stock, saving you time and effort.

Cooperation Process

1. Enquiry and Quotation: The client provides details such as chip model, quantity, condition and batch number, and we promptly provide an accurate quotation;

2. Confirmation of Cooperation: Both parties confirm the price and transaction method, reaching an agreement;

3. Inspection and Collection: On-site inspection and collection within the same city; for out-of-town locations, inspection via courier;

4. Rapid Payment: Upon successful inspection, full payment is settled immediately, and the transaction is completed.

I. Overview of ROHM’s Power Management Switch Product Portfolio

Leveraging its proprietary power semiconductor processes, ROHM has established three major power switch product lines: integrated high-side smart switches, single-chip load switches, and high-side drive controllers with external NMOSFETs. These cover power distribution requirements across all scenarios, including consumer electronics, portable devices, industrial control, automotive electronics and AI terminals. At the core of these products is the unified integration of multiple hardware protection features, including soft start, overcurrent, over-temperature and undervoltage latch protection. The product range follows two technical approaches: firstly, single-chip smart switches with built-in MOSFETs (high-side IPD, portable load switches); and secondly, standalone controllers that drive external NMOSFETs, suitable for high-current, high-voltage and multi-channel power distribution solutions, balancing miniaturisation with flexible high-power design.

II. ROHM High-Side Switches (Smart IPD Series)

1. Core Definition and Architecture

High-side switches position the power MOSFET between the power supply input and the load, directly controlling the positive terminal of the load supply. Compared to low-side switches, they offer advantages such as open-load detection, reverse reverse-current protection and clamping protection for inductive loads. They are divided into two main branches: consumer-grade N-channel integrated high-side switches and the automotive-grade IPD smart high-side device BV1HB/BV2HB series. All incorporate an internal NMOS power transistor, eliminating the need for external driver circuits.

2. Consumer-grade Integrated High-Side Switches (BD Series)

Representative models: BD82029FVJ, BD2262G-M, BD2206G-LB

Voltage range: 2.7V–5.5V for low-voltage portable applications, suitable for USB, memory cards and camera sub-power supplies

Key features: Integrated low-resistance NMOSFET (Rds(on) 120–150 mΩ), with built-in soft-start to suppress inrush current; under-voltage lockout (UVLO), thermal shutdown (TSD) and cycle-by-cycle overcurrent protection (OCP); output discharge and reverse current blocking upon shutdown; open-drain fault flag, directly connectable to MCU 3.3 V/5 V logic levels

Typical Applications: Power supply for laptop USB ports, tablet memory card slots, power supplies for handheld device peripherals, and small industrial control I/O modules

3. Automotive-Grade Smart High-Side IPDs (BV1HB/BV2HB Series)

Representative Models: BV1HBxxxEFJ-C (single-channel), BV2HB020EUV-C (dual-channel)

Voltage Rating: 8–34V wide voltage range, compatible with 12V automotive battery systems; Rds(on) as low as 9mΩ; continuous current range from 0.8A to 18A

Automotive-grade enhancements: AEC-Q100 certified, supports functional safety (FS) analysis; active clamping circuit dissipates switch-off energy from inductive loads; high-precision on-chip current sensing for real-time monitoring of load current; triple diagnostics for open circuit, short circuit and reverse battery connection; dual-channel models support independent control of multiple body loads such as headlights, windows and door locks

Industrial Applications: 34V-rated models are suitable for power distribution to solenoid valves and relays in 24V industrial equipment

4. Key Advantages of High-Side Switching

High Safety: The load is disconnected at the power supply side; no residual high voltage remains on the load in the event of a short circuit or leakage;

Diagnostic Capabilities: Accurately identifies load open-circuit and short-circuit faults via the current sensing pin;

Inductive Load Compatibility: Built-in active clamping prevents devices from being damaged by switching spikes when relays or motors are de-energised;

Minimal Peripherals: Single-chip integration of driver, MOSFET and a full suite of protection features reduces PCB footprint by 60 per cent.

III. ROHM Load Switches

Load switches are lightweight high-side power distribution chips, featuring ultra-low standby power consumption and ultra-miniature packaging. Designed for battery-powered portable devices, they are categorised into two main types: N-channel integrated high-side load switches and P-channel ultra-low-voltage models. They serve as core components for tiered power management in mobile devices.

1. N-channel Integrated Load Switches (BD/BUS Single-Channel Series)

Low-voltage portable model (BD2206G-LB)

Input 2.7–3.6 V, 0.5 A continuous output, compact SSOP5 package, with long-term supply assurance for industrial applications; suitable for SD cards and sensor sub-power supplies, featuring adjustable soft-start time and automatic restart following overheating.

Ultra-micro UCSP package (BUS1DJC0GWZ)

0.8 × 0.8 mm ultra-thin chip-scale package, with a quiescent current of just 0.35 μA; features an integrated discharge resistor and short-circuit protection, and supports an ultra-low input voltage of 1.2 V; used for powering micro-modules in smartwatches, TWS earphones and wearable devices, with millisecond-level fast soft-start to suppress capacitor surges.

High-Voltage Industrial Load Switch BV1HAL Series

Wide input voltage range of 8–32 V with externally adjustable overcurrent threshold; a single chip enables switching of 24 V industrial peripherals, with fault flags reported to the host controller, replacing discrete MOSFETs and operational amplifier protection circuits.

2. Comparison of P-Channel Types and Selection Criteria

ROHM has also launched P-channel load switches, which offer the advantage of simple drive logic; however, their on-resistance and current handling capability are inferior to those of N-channel integrated solutions. For high-current, low-loss applications, N-channel integrated load switches—that is, NMOS architecture load switches—are the preferred choice, as they strike a balance between on-state losses and ease of control.

3. General Core Functions of Load Switches

Ultra-low leakage current: nA-level leakage current in the off state, extending battery life;

Programmable soft-start: Suppresses inrush current in high-capacitance loads, protecting the upstream DC-DC converter;

Integrated discharge circuit: Rapidly discharges residual load voltage upon power-off to prevent accidental triggering of peripheral devices;

Comprehensive protection chain: Integrated OCP (over-current protection), TSD (thermal shutdown), UVLO (under-voltage lockout) and ESD (electrostatic discharge) protection.

IV. ROHM NMOSFET High-Side Controller (External MOSFET Driver Solution)

1. Product Positioning

Unlike integrated switches with built-in MOSFETs, the NMOSFET high-side controller does not contain a power MOSFET. It is specifically designed to drive an external N-channel power MOSFET to establish a high-side power path, making it suitable for high-current (20A and above), high-voltage, multi-channel parallel and high-power industrial/automotive applications, thereby addressing the limitation of current capacity inherent in single-chip integrated MOSFET solutions.

2. Technical Principle: Charge Pump High-Side Drive

When an N-channel MOSFET is used as a high-side switch, the gate voltage must exceed the input supply voltage for full conduction. ROHM’s controller incorporates an on-chip charge pump, eliminating the need for an additional isolated power supply and directly boosting the gate drive voltage to reliably drive the external N-channel MOSFET; it also integrates a comprehensive set of monitoring and protection circuits to continuously monitor the current and temperature status of the external MOSFET.

3. Representative Products and Key Features

General-purpose industrial NMOS high-side driver IC

Supports a wide input range of 5–40 V; the charge pump provides a stable drive voltage of 10 V or higher, making it suitable for high-voltage, high-power NMOS devices;

Integrated high-precision current sampling and amplification, with flexible external resistor settings for overcurrent thresholds;

Thermal shutdown, under-voltage lockout, short-circuit current limiting with cycle-by-cycle control, and optional fault latch/automatic recovery.

Automotive-Grade DrMOS Companion NMOS Driver (BD96340MFF-C)

Designed specifically for high-current power supply to automotive SoCs; drives external NMOS switches with up to 20 A continuous and 30 A peak current;

AEC-Q100 automotive-grade, supporting multi-level power distribution for ADAS and in-vehicle camera domain controllers;

Dual protection via synchronous rectification and high-side path protection, compatible with multi-rail power supply expansion for both high and low voltages.

Multi-Channel NMOS Array Controller

SPI-programmable multi-channel driver, independently controlling multiple external NMOS high-side switches;

Independent fault detection per channel; a short circuit in one channel does not affect the remaining power rails, making it suitable for tiered power supply in industrial robots and AI computing boards.

4. Application Scenarios for NMOSFET Controllers

High-power equipment: industrial servos, humanoid robot power supplies, high-power in-vehicle power distribution units;

Multi-channel expandable systems: server single-board computers, multi-rail power supplies for AI accelerator cards;

Customised high-voltage solutions: 24V/36V energy storage power supplies for industrial equipment, main circuits for lithium-ion battery charging and discharging;

Cost-optimised volume projects: low-cost external NMOS devices can be freely selected according to current requirements, allowing flexible adjustment of power specifications.

IV. Industry Applications

Consumer Electronics: Sub-power supplies for mobile phones and tablets, TWS, smart wearables, USB docks; utilising N-channel load switches;

Automotive Electronics: Power distribution for vehicle lights, windows, door locks and domain controllers; BV series automotive-grade high-side IPDs;

Industrial Automation: 24V solenoid valves, sensor arrays, humanoid robot power supplies; combination of high-voltage high-side switches and external NMOS controllers;

AI Computing Equipment: multi-rail, tiered power supply for servers and vision processing boards; multi-channel NMOSFET controllers;

Lithium-Ion Energy Storage Equipment: high-power pathways for charge/discharge main circuits; external NMOS high-side drive solutions.