Le blog de l'entreprise TI TPSM33615 1.5A Synchronous Buck Power Module With Mitigated Interference And Noise Technology

Shenzhen Mingjiada Electronics Co., Ltd. supplies the TI TPSM33615 1.5A synchronous buck power supply module, which utilises interference and noise suppression technology.

The TPSM33615 is an integrated synchronous buck power module launched by TI, incorporating the TI MINT 1 interference and noise suppression architecture. Designed for power supply applications with low EMI requirements—such as industrial equipment, smart devices, automation equipment and humanoid robots—it highly integrates the controller, power MOSFETs, inductor and bootstrap capacitor, thereby significantly simplifying power supply PCB layout and reducing the design complexity associated with switching power supply noise and electromagnetic interference. Texas Instruments. The module utilises a HotRod™ FCOL flip-chip package, measuring just 4.5 mm × 3.5 mm × 2 mm, making it the preferred solution for compact, low-noise power rails with a wide input voltage range.

I. TPSM33615 Product Overview
The TPSM33615, part of TI’s TPSM336x5 series, is a synchronous buck power supply module that integrates an inductor, bootstrap capacitor and power MOSFET. Its key feature is MINT 1 (Mitigated Interference & Noise Technology, Architecture 1) . It is designed for low-EMI industrial, automation and humanoid robotics applications—where electromagnetic interference is a critical concern—and natively supports the CISPR 11 Class B radiated disturbance standard, significantly simplifying EMC design.

1. Key Electrical Parameters
- Topology: Synchronous buck step-down module
- Input voltage: 3V to 36V wide-range input
- Output voltage: 1V to 15V adjustable, configured via a feedback resistor voltage divider
- Rated output current: 1.5A
- Switching frequency: 200 kHz to 2.2 MHz, configurable via the RT pin or synchronised with an external clock
- Control architecture: Peak current mode with built-in loop compensation; no external compensation network required
- Quiescent current: As low as 1.5 µA at 13.5 V input with no load, suitable for devices in constant standby mode
- Operating temperature: -40°C to +125°C
- Package: HotRod™ QFN-FCMOD (RDN), 11-pin, dimensions 4.5 mm × 3.5 mm, thickness 2 mm, FCOL flip-chip lead technology

2. MINT 1 Interference and Noise Suppression Technology
This comprehensive low-noise solution comprises a three-pronged approach involving packaging technology, layout optimisation and modulation algorithms, and is the key feature that distinguishes this model from standard power supply modules:
DRSS Dual Random Spread Spectrum Modulation
Unlike conventional single-spread spectrum techniques, DRSS employs dual randomisation to spread switching energy evenly across the frequency band, thereby reducing EMI peaks. This eliminates the need for costly EMI components such as common-mode chokes, shielding enclosures and input filter inductors, reducing both BOM costs and PCB area requirements.

FCOL (Flip-Chip On Lead) Low-Parasitic Packaging
The Flip-Chip On Lead (FCOL) packaging minimises parasitic inductance in the switching node loop, thereby suppressing radiated noise caused by di/dt and dv/dt. With integrated inductors and bootstrap capacitors within the module, the high-noise power loop is contained within the package, significantly reducing external radiation.

Dedicated EMI-optimised layout for pins and pads
TI’s natively optimised pin definitions naturally shorten switching node traces, guiding users towards shielded switching node routing to reduce radiated coupling; modules undergo EMI pre-testing prior to shipment and meet the baseline requirements of CISPR 11 Class B.

Frequency Synchronisation + FPWM and Forced PWM Selectable Modes
Supports external clock synchronisation to avoid sensitive frequency bands such as those used by RF and sensors; in FPWM mode, a fixed switching frequency is maintained at full load, ensuring a stable and controllable noise spectrum; in automatic mode, the device switches to PFM at light loads, balancing efficiency and noise performance.

3. Efficiency and Operating Modes
Features an integrated low Rds(on) synchronous MOSFET, delivering excellent efficiency across the entire load range; supports a choice between automatic mode (seamless switching between PWM and PFM) and forced PWM mode. Automatic mode is suitable for battery-powered and standby devices; FPWM is suitable for precision systems requiring a constant noise spectrum and multi-power-supply synchronisation.

4. Integrated Protection and Features
- EN enable pin; programmable soft-start to suppress inrush current
- PGOOD open-drain power-good indicator, eliminating the need for a separate reset monitoring IC
- Cycle-by-cycle overcurrent protection, input under-voltage lockout (UVLO) and pre-biased start-up to prevent power-on damage to downstream loads
- Functional Safety-Capable, suitable for industrial equipment requiring safety certification (Texas Instruments)

5. Typical Application Scenarios
Suitable for powering humanoid robot servos and control boards, industrial automation I/O modules, test and measurement instruments, low-noise sensors, auxiliary power supplies for 5G remote units, and battery-powered portable devices—particularly systems that are sensitive to radiated noise, have compact form factors, and require rapid EMC certification.

II. TPSM33615 Procurement, Selection and Buyer’s Guide
Key Considerations for Selection
1. Voltage rail compatibility: Ensure the bus input falls within the 3–36 V range, the output voltage is within the adjustable range of 1–15 V, the continuous load current does not exceed 1.5 A, and sufficient margin is provided for peak inrush current;
2. Selection Based on EMI Priority: If the device requires compliance with CISPR 11 Class B, space is limited, and the addition of a large number of ferrite beads or common-mode chokes is undesirable, prioritise the TPSM33615 to simplify EMI remediation utilising its built-in MINT noise suppression architecture;
3. Frequency and synchronisation requirements: For multi-module on-board applications where beat frequency interference needs to be avoided, select the version with the SYNC synchronisation function to standardise the switching frequency;
4. Environmental considerations and packaging: The HotRod QFN package offers an optimal heat dissipation path and is suitable for high-density circuit boards; care must be taken to ensure compatibility with the reflow soldering process to prevent damage to the flip-chip package.

Procurement and usage considerations
- Voltage configuration is achieved via voltage-dividing resistors; the total resistance of the voltage divider should be maintained within the range of 5 kΩ to 10 kΩ to ensure voltage regulation accuracy;
- Maintain an appropriate input capacitance on the input side; spread-spectrum technology only suppresses switching noise and cannot fully replace basic input filtering;
- Distinguish between sample and mass-production batches; verify the model silkscreen and original manufacturer’s batch number to avoid confusion when procuring other models in the TPSM33625 series;
- Recommended application scenarios: industrial controllers, sensor acquisition boards, on-board power supplies for humanoid robots, automated equipment, and portable test instruments; Not suitable for applications involving sustained high voltages exceeding 40V or extremely high peak surge loads.

Alternative Options
The TPSM33625 from the same series is the 2.5A version and is pin-compatible; if current requirements are below 1A and cost is a greater consideration, the LMZM series modules may be compared.

III. Supply Quality and Delivery of Mingjiada Electronics Products
Shenzhen Mingjiada Electronics has long supplied the full range of TI power modules, including both stock and forward orders for the TPSM33615, whilst also offering a buy-back service for surplus and obsolete stock from the same series. We cover all stages of demand—from R&D samples and small-batch trial production to large-scale mass production—providing customers with a stable component supply service.

Quality Control System
All TPSM33615 stock sourced by Mingjiada originates from legitimate original manufacturers and authorised channels. We guarantee genuine, original products; shipments are accompanied by original manufacturer batch numbers, datasheets and compliance documentation. We have established an end-to-end material traceability mechanism, with every batch undergoing visual inspection, silkscreen verification and packaging checks upon entry into the warehouse. Particular attention is paid to power modules to identify risks associated with refurbished or dismantled components, thereby preventing counterfeit materials from entering production lines; For components sensitive to batch consistency, such as low-EMI power modules, we prioritise securing consecutive batches directly from the original manufacturer to ensure consistency in noise and efficiency parameters, thereby meeting customers’ stability requirements for EMC testing.

Stock and Delivery Capabilities
Leveraging our dual-warehouse network in Shenzhen and Hong Kong, we maintain a constant stock of mainstream TI power management models. For the TPSM33615, we support rapid dispatch of samples and small batches, as well as scheduling for large-volume future deliveries. We respond swiftly to urgent R&D orders, dispatch standard stock orders efficiently, and monitor the manufacturer’s production schedule for forward orders, providing early warnings of delivery time fluctuations to mitigate the risk of project delays caused by chip shortages. We also support sample disassembly and tray splitting services to accommodate small-volume prototyping needs during the hardware development phase, thereby reducing the burden on customers’ component procurement.

Complementary Value-Added Services
Mingjiada provides technical consultancy on power management components, assisting customers in confirming TPSM33615 selection, spread-spectrum function configuration and peripheral component matching schemes, whilst offering alternative model recommendations. In addition to TI, we provide one-stop solutions covering signal chain, power, MCU and RF components from other brands, enabling customers to centrally procure power modules, isolators, operational amplifiers, wireless SoCs and other materials, thereby simplifying supplier management.