TPS40200DR

Texas Instruments TPS40200DR — Wide-Input Non‑Synchronous Buck Controller (SOIC‑8)

The Texas Instruments TPS40200DR is a wide-input, non-synchronous buck (step-down) DC/DC controller built for designers who prefer the flexibility of an external power stage. Operating over the industrial temperature range (−40°C to +85°C) and delivered in a compact 8‑pin SOIC (D) package, this controller drives an external N‑channel MOSFET to implement efficient, scalable step-down regulation in industrial and general-purpose power supplies.

If you need a proven, vendor-supported controller that balances simplicity with design freedom, the TI TPS40200DR offers a compelling path: you select the power components (FET, inductor, diode, and sense elements) to match your voltage/current targets, while the controller manages PWM regulation and control housekeeping. This keeps your BOM adaptable from prototype to production.

At a Glance

• Manufacturer/Brand: Texas Instruments
• Series: TPS40200
• MPN: TPS40200DR
• Category: DC/DC Controller (Buck)
• Topology: Buck (Step-Down)
• Architecture: Non‑Synchronous (uses external diode as the freewheel element)
• Switch Element: External N‑channel MOSFET (controller only)
• Package: SOIC‑8 (D)
• Packaging: Tape & Reel (TR)
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temperature: −40°C to +85°C
• Input Range: Wide‑input (exact limits not specified in provided data; consult datasheet)

Overview and Value Proposition

The Texas Instruments TPS40200DR is designed for applications that benefit from the adaptability of a controller-based approach rather than an integrated regulator. Because the switch, diode, and magnetics are external, you can tailor the design for:

• Different input bus voltages and output rails
• A wide span of output currents by selecting appropriate MOSFETs and inductors
• Cost or efficiency priorities, by choosing components with performance that aligns to your goals

For sourcing teams and buyers, the controller-plus-external stage model can simplify risk management. If MOSFETs or inductors face supply fluctuations, alternative components with equivalent ratings and footprints can often be qualified without changing the controller itself. The TI TPS40200DR thus supports long-term maintainability and supply continuity across product lifecycles.

Key Specifications

• Topology: Buck (Step-Down)
• Control Type: PWM controller for external N‑MOSFET
• Synchronization: Non‑synchronous (uses a diode for freewheeling)
• Package / Case: SOIC‑8 (D)
• Mounting Type: Surface Mount
• Operating Temperature: −40°C to +85°C
• Pin Count: 8
• Max Switching Frequency: Not specified in provided data (refer to datasheet)
• Input Voltage Range: Wide‑input (specific limits not provided; see datasheet)
• Protection/Control Features: Not specified in provided data (verify in datasheet)

Where exact limits are required for compliance, qualification, or safety, rely on the official TI datasheet: https://www.ti.com/lit/ds/symlink/tps40200.pdf.

Functional Highlights

Non‑Synchronous Buck Architecture

The TPS40200DR implements a non-synchronous topology, which replaces the low-side MOSFET with a diode. This can reduce complexity and BOM count compared to synchronous designs, making it attractive where simplicity, cost efficiency, and acceptable thermal margins take priority.

External N‑MOSFET Control

By driving an external N‑channel MOSFET, the controller lets you scale the power stage to your output current and thermal needs. You can select:

• Low RDS(on) devices for high current and efficiency
• FETs with suitable gate charge for your target switching frequency and efficiency balance
• Packages aligned to your thermal strategy (e.g., larger packages or improved heat spreading on the PCB)

Wide-Input Capability

The part is described as a wide‑input controller. While exact voltage limits are not specified in the provided data, this characteristic generally suits designs fed from higher-voltage industrial rails or multi-cell battery packs. Always size component ratings to your worst-case conditions and confirm limits in the TI datasheet.

PWM Control for Regulated Output

As a PWM controller, the TPS40200DR modulates duty cycle to maintain a stable output voltage against load and line changes. Compensation and loop stability depend on your chosen power components and passive network. Follow the datasheet’s guidance on compensation selection and verify stability across operating corners.

Applications

• Industrial power supplies
• General-purpose step-down regulation

These categories cover a range of real-world use cases:

• Pre-regulators feeding point-of-load modules in industrial controllers
• Step-down rails from 12 V/24 V industrial buses
• Board-level regulation for PLC I/O, sensors, and embedded systems
• Cost-optimized power stages in general embedded designs

The flexibility of external components makes the Texas Instruments TPS40200DR suitable for both new designs and sustaining projects where designers must retrofit or optimize existing power stages.

Design Considerations

Selecting the External MOSFET

• Voltage rating: Choose VDS comfortably above your maximum input voltage plus ringing.
• Current/thermal: Ensure continuous and peak current capability with appropriate thermal derating.
• Gate charge and drive: Balance switching losses (Qg) and conduction losses (RDS(on)) for your frequency target and efficiency goals.

Diode Choice for Non‑Synchronous Freewheeling

• Use a fast-recovery or Schottky diode with current rating above your peak inductor current.
• Select reverse voltage rating above the worst-case input.
• Thermal: Diode conduction losses can be significant; allocate copper area or heatsinking accordingly.

Inductor Selection

• Inductance: Set based on your desired ripple current ratio and switching frequency (confirm frequency capability in the datasheet).
• Saturation current: Must exceed peak inductor current with margin.
• DCR and core losses: Evaluate efficiency and thermal rise across operating points.

Input and Output Capacitors

• Input: Low-ESR capacitors to handle ripple current and mitigate line transients.
• Output: Set ESR and capacitance to meet transient response and ripple requirements; consider ceramics for ripple plus bulk capacitors for load step handling.

Compensation and Stability

• Follow TI’s recommended formulas and design flow for the error amplifier compensation network.
• Validate with Bode plots and transient tests across line, load, and temperature extremes.

Layout Guidance

• Keep the high di/dt loop (FET, diode, inductor, input caps) as tight as possible.
• Separate power and signal grounds; connect at a single point to minimize noise injection.
• Provide adequate copper for heat spreading on FET and diode.
• Route the feedback trace away from switching nodes and noisy regions.

Note: Specific pin functions and any internal protection features are not provided in the dataset. Consult the datasheet for exact pinout, recommended component values, soft-start, current limit method, and additional guidance.

Package, Handling, and Assembly

• Package: SOIC‑8 (D)
• Pin Count: 8
• Mounting: Surface Mount
• Packaging for shipment: Tape & Reel (TR)

The SOIC‑8 package is broadly supported in standard SMT assembly flows, with ample footprint libraries and straightforward inspection. Moisture sensitivity level (MSL) and reflow profile are not specified here—refer to TI packaging documentation and the product datasheet for official guidance. For high‑volume assembly, the TPS40200DR’s TR packaging helps streamline automated placement and reduce handling risk.

Lifecycle, Compliance, and Sourcing

• Lifecycle Status: Not specified in provided data (check TI product page)
• RoHS / Environmental: Not specified in provided data
• Inventory (this listing): 0 units at time of data snapshot

Guidance for buyers and sourcing managers:

• Verify lifecycle status and environmental compliance on the TI product page: https://www.ti.com/product/TPS40200.
• If supply tightens, controllers like the Texas Instruments TPS40200DR are often less supply-constrained than power modules, but external FETs and magnetics may drive overall availability—plan alternates for these components.
• With inventory currently at 0 units in this dataset, consider lead-time planning, approved alternates within your AVL, and early commits for ramp schedules. Distributors may stock additional suffixes or packaging options; ensure the SOIC‑8 (D) and Tape & Reel (TR) attributes match your assembly requirements.

Ordering Information

• Part Number: TPS40200DR (Texas Instruments)
• Series: TPS40200
• Category: DC/DC Controller (Buck)
• Package: SOIC‑8 (D)
• Packaging: Tape & Reel (TR)

If you must maintain package consistency across sites, include the package code (D) and packaging designation (TR) on purchase orders and AVL records to prevent substitutions that could affect assembly.

Specifications Summary

• Topology: Buck (Step-Down)
• Synchronous/Asynchronous: Non‑Synchronous
• External Power Switch: N‑channel MOSFET (external)
• Operating Temperature: −40°C to +85°C
• Package/Case: SOIC‑8 (D)
• Mounting Type: Surface Mount
• Pin Count: 8
• Input Voltage Range: Not specified in provided data
• Switching Frequency: Not specified in provided data
• Protections/Features: Not specified in provided data

Always confirm numerical limits, pin functions, and feature set in the TI datasheet before final design sign-off.

Resources

• Product Page: https://www.ti.com/product/TPS40200
• Datasheet (TPS40200): https://www.ti.com/lit/ds/symlink/tps40200.pdf

These links provide authoritative, up-to-date electrical specifications, typical application circuits, and layout recommendations.

Frequently Asked Questions (FAQs)

Q: What is the Texas Instruments TPS40200DR?
A: It’s a wide‑input, non‑synchronous buck (step‑down) PWM controller that drives an external N‑channel MOSFET to regulate a lower output voltage from a higher input source.

Q: What package is the TPS40200DR available in?
A: SOIC‑8 (D), delivered in Tape & Reel (TR) packaging for automated assembly.

Q: What operating temperature range does it support?
A: −40°C to +85°C, suitable for industrial environments within that range.

Q: Does the TPS40200DR include the power MOSFET?
A: No. It is a controller that drives an external N‑channel MOSFET and uses a diode for the freewheel path (non‑synchronous architecture).

Q: What is the input voltage range and switching frequency?
A: Not specified in the provided data. Refer to the official TI datasheet for exact limits and design equations.

Q: Is the TPS40200DR RoHS compliant?
A: Environmental status is not specified in the provided data. Check the TI product page for current compliance information.

Q: What applications is the TPS40200DR suited for?
A: Industrial power supplies and general-purpose step-down regulation, among other similar use cases that benefit from a controller-based power stage.

Q: How do I size the external components?
A: Use the datasheet’s design guidelines to choose the MOSFET, diode, inductor, and capacitors based on your input/output requirements and target switching frequency, then validate stability and thermals in testing.

Summary

The Texas Instruments TPS40200DR gives power designers a straightforward, flexible way to implement a buck regulator with a wide input capability and an external power stage. Its non‑synchronous design using an external N‑MOSFET and diode keeps the controller compact (SOIC‑8) and easy to assemble, while leaving you free to optimize efficiency, cost, and thermal performance through component selection. For reliable specifications, application circuits, and layout guidance, consult the official TI datasheet and product page. With proper component choices and validation, the TPS40200DR can serve as a durable, scalable backbone for industrial and general-purpose step-down power supplies.