Le blog de l'entreprise TI TPS4H000 Quad-Channel Automotive Smart High-Side Switch With Adjustable Current Limit

Shenzhen Mingjiada Electronics Co., Ltd. supplies the TI TPS4H000 four-channel automotive-grade intelligent high-side switch with adjustable current limiting.

The TPS4H000 is a four-channel automotive-grade intelligent high-side switch that integrates four 1000 mΩ power FETs. It supports an external resistor-based adjustable current limiting scheme and is designed for the intelligent driving of automotive body loads, being suitable for resistive, inductive and capacitive loads. With comprehensive built-in protection circuits and diagnostic feedback, it is the preferred power switching device for body ECUs, vehicle lighting, relays and valve train drives. The TPS4H000 complies with the AEC-Q100 automotive reliability standard. Its wide operating voltage range accommodates common fluctuations in vehicle power supplies, whilst offering low standby power consumption, high-precision current sensing and active clamping for inductive loads. It offers significant advantages in simplifying the Bill of Materials (BOM) and enhancing fault diagnosis capabilities for load circuits.

I. TPS4H000 Product Details
1. TPS4H000 Product Description
The TPS4H000 is a smart high-side switch with four independently controlled channels. Each channel can be switched on and off independently, with current-limiting thresholds flexibly configurable via external resistors. The current-limiting range is 0.1A to 1.3A, and the maximum continuous load current per channel is 0.75A. The TPS4H000 is available in two versions: Version A features open-drain digital diagnostic outputs, whilst Version B provides analogue current sensing outputs, allowing customers to select the diagnostic interface that best suits their main control scheme. The chip integrates under-voltage lockout, short-circuit-to-ground protection, thermal shutdown and negative voltage clamping for inductive loads, with optimised turn-off slopes to effectively suppress switching transients and reduce EMI design challenges. With a standby current of less than 500 nA, it is suitable for automotive control units in long-term sleep mode, reducing static power consumption. The adjustable current-limiting mechanism restricts inrush and short-circuit currents, protecting PCB traces, connectors and upstream power supplies, whilst lowering system hardware requirements and costs.

2. TPS4H000 Key Specifications
- Number of channels: 4 independent high-side switches
- Automotive grade: AEC-Q100 certified
- Operating voltage: 3.4 V to 40 V
- Typical on-resistance: 1000 mΩ
- Continuous current per channel: 0.75 A
- Adjustable current limit range: 0.1 A to 1.3 A, set via external resistor
- Current sensing accuracy: ±15% when load > 5 mA; ±20% when current limit setting > 100 mA
- Quiescent current: < 500 nA
- Protection functions: Undervoltage lock-out (UVLO), short-circuit to ground protection, thermal shutdown (with lock-out option), active negative voltage clamping for inductive loads
- ESD rating: HBM H2, CDM C4B
- Package: PWPR (HTSSOP)

3. Key Features of the TPS4H000
1. Adjustable current limiting via external resistor, with independent configuration per channel, suitable for different load current requirements such as LED lighting assemblies, relays and solenoid valves
2. Available in two versions: digital open-drain diagnostic output or analogue current detection output, facilitating MCU diagnosis of open-circuit, short-circuit and overcurrent conditions
3. Four independently controlled channels with no mutual interference, supporting time-division or synchronous driving of multiple vehicle body loads
4. Wide automotive voltage tolerance, compatible with 12V automotive systems under load shedding and voltage sag conditions
5. Built-in inductive load clamping circuit to suppress reverse voltage during shutdown; no additional freewheeling diodes are required, simplifying the peripheral circuitry
6. Thermal shutdown with lock-out mode: channels are locked following overheating to prevent device damage caused by repeated thermal cycling; can be reset once the fault is cleared
7. Extremely low standby power consumption, suitable for battery-powered body control modules, reducing the vehicle’s static power consumption
8. Comprehensive fault reporting mechanism, supporting feedback of open-circuit, short-circuit, overcurrent and overheating conditions to the main controller

4. Typical Applications of the TPS4H000
Suitable for automotive body control modules (BCMs), cockpit domain controllers, headlamp drivers, seat controls, door lock actuators, relay and solenoid valve drivers, in-vehicle sensor power supply circuits, and power switches for low-power in-vehicle peripherals. It may also be used for intelligent multi-channel load driving in construction machinery, commercial vehicle electronic control systems, and specialised in-vehicle automated control units.

II. TPS4H000 Procurement, Selection and Buyer’s Guide
1. Key Selection Criteria
Firstly, confirm the version distinction: TPS4H000A-Q1 features digital open-drain diagnostic outputs; TPS4H000B-Q1 features analogue current detection outputs. This is the primary distinguishing factor for selection.
Secondly, verify the load current: the continuous load per channel must not exceed 0.75A. Calculate and set the current limit via an external resistor, allowing for surge margins to prevent frequent triggering of the current limit.
Assess the power supply conditions: ensure the system’s maximum drop-out voltage does not exceed 40V; when the voltage falls below 3.4V, the device enters under-voltage lockout and automatically shuts down the output.
EMI and load type: When driving inductive loads such as relays and solenoid valves, the device features built-in clamping; prioritise the assessment of wiring inductance and, where necessary, add an RC snubber.
Temperature conditions: In high-temperature areas such as the vehicle cabin and underbody, current derating design must be carried out in conjunction with the derating curve to prevent erroneous thermal shutdown triggering.

2. Procurement Considerations
The TPS4H000 is an automotive-grade device with stringent requirements regarding batch traceability, original manufacturer packaging, temperature cycling and reliability reports; the use of loose new, refurbished or salvaged components is strictly prohibited. When placing an order, clearly specify the part number suffix to distinguish between A and B versions, and simultaneously confirm the package type, tape-and-reel packaging, original manufacturer batch number and date of manufacture.
It is recommended to allow for lead time, as TI’s automotive chips are subject to periodic fluctuations in production capacity; during the sampling phase, prioritise requesting samples directly from the manufacturer or small batches of stock items, and secure production scheduling well in advance for mass production orders. Required supporting documentation: Datasheet, AEC-Q100 report, Material Safety Data Sheet (MSDS), and Certificate of Conformity (COC).
Substitution recommendations: If a higher current capacity is required, consider evaluating TI’s higher-current intelligent high-side switches from the same series; for applications with a larger number of loads, use multiple TPS4H000-Q1 devices to scale up.

3. Design best practices
Route current-limiting resistors close to the device’s CL pin to minimise parasitic effects; Distribute power across multiple loads as widely as possible to prevent localised overheating of the chip; Add pull-up resistors to diagnostic pins to match the host controller’s I/O levels; Add a TVS capacitor to the power supply input to protect against in-vehicle surges.

III. Shenzhen Mingjiada Electronic Components Supply: Quality and Delivery Processes
Shenzhen Mingjiada Electronics has long supplied electronic components, supporting samples, small-batch trial production and mass production orders, whilst also offering electronic component recycling services.

[Quality Control System]
1. Supply Chain Traceability: Components are sourced directly from TI’s original factory and authorised channels. Each batch is accompanied by the original Certificate of Conformity (COC), batch barcode and original packaging. A traceability ledger is maintained for each individual item, ensuring the rejection of counterfeit, refurbished or re-labelled components.
2. Incoming Inspection: Upon arrival, we carry out visual, silkscreen and packaging checks. For automotive-grade components, we conduct additional random electrical performance testing, X-ray internal structure verification and solderability testing, with a focus on verifying key indicators such as continuity, current limiting and protection functions, in accordance with AEC-Q100 quality control requirements.
3. Warehouse Management: Automotive chips are stored in a dedicated, temperature- and humidity-controlled area on anti-static shelving. The time limit for opening MSD (moisture-sensitive) packages is strictly controlled, and exposure time to humidity is recorded to prevent delamination and oxidation-related failures.
4. Supporting Documentation: Datasheets, specifications, material reports and original manufacturer’s certification documents are provided with the shipment to support the integration of documentation for customers’ IATF 16949 project audits.
5. After-sales Quality Response: Prompt review of parameter anomalies or packaging issues; support for returns, replacements and re-inspection; and cooperation with the customer’s FA analysis.

[Standardised Delivery Process]
1. Requirements Coordination: The customer provides complete part numbers, versions, packaging types, quantities, lead times and quality requirements; our technical team assists in confirming version selection and parameter matching.
2. Quotation and Stock Confirmation: We provide prompt feedback on stock-to-hand, forward orders, prices and lead times, distinguishing between sample and bulk pricing, whilst also confirming whether the product is supplied in the original manufacturer’s tape-and-reel or tray packaging.
3. Order Confirmation: Both parties confirm the order details, technical requirements and delivery milestones; purchase and sales documents are signed, with flexible settlement terms supported.
4. Order Fulfillment and Re-inspection: The warehouse prepares the goods, whilst the quality control department conducts incoming inspection, applies labelling, and provides anti-static packaging, with automotive-grade components clearly marked.
5. Dispatch and Logistics: For stock orders, domestic shipments are prioritised for dispatch within 48 hours; urgent requirements are supported by expedited allocation. For back-ordered items, we monitor the original manufacturer’s production schedule and provide regular progress updates; Logistics are fully traceable throughout the journey, with anti-static packaging protection; moisture-proof bags and desiccants are added for fragile and moisture-sensitive components.
6. Delivery Follow-up and Technical Support: We follow up on delivery and confirmation of receipt upon arrival; we provide documentation support during the component soldering and circuit debugging stages, and assist customers in understanding adjustable current-limiting configurations and diagnostic interface usage solutions.