PI3740-00-LGIZ: Modular ZVS Buck-Boost Architecture for Integrated Solutions in Medium and High Power Designs

In mid- to high-power embedded systems, DC-DC power conversion modules face not only power density challenges but also complex trade-offs across a wide input range, high-load response, and electromagnetic interference. The PI3740-00-LGIZ is a ZVS (Zero-Voltage Switching) buck-boost regulator from Vicor. Featuring a highly integrated system-in-package (SiP) architecture, it offers 8–60V input and 10–50V output capabilities, with a continuous output power of up to 140W.

By adopting a soft-switching ZVS topology and synchronized high-frequency switching control, the PI3740-00-LGIZ achieves up to 96% efficiency and fast transient response while maintaining a compact size, simple periphery, and good EMI suppression performance. It is a “burden-reducing power supply platform” designed specifically for system engineers.

Technical Features Overview

Typical Application Directions

Thanks to its wide input voltage support, continuous power output capability, and stable thermal design, the PI3740-00-LGIZ is suitable for:

• Communications and network equipment: For example, powering switching chips and optical modules in 48V systems;
• Industrial automation systems: high-efficiency power modules for PLC controllers and motor drive boards;
• BMS and energy storage system: as the core module for battery voltage stabilization and energy distribution;
• Embedded platforms or micro servers: modular deployment of power supply units, adapting to multiple voltage rails;
• High-end lighting and LED driver: With constant current control (LGH mode), suitable for current closed-loop control scenarios.

Engineering design recommendations

When designing integration, it is recommended to pay attention to the following points:

• External inductor matching: It is recommended to use a 420nH ±10% inductor (such as Eaton HCV1206-R42-R or Pulse PA5119.421NLT) to meet startup and steady-state performance requirements;
• Output voltage setting: Connect to the EAIN pin through a resistor divider. The recommended value for R2 is 1.65 kΩ. R1 is calculated as R1 = R2 × (Vout/1.7–1).
• Input and output capacitor configuration: It is recommended to use ≥ 6 × 2.2µF X7R ceramic capacitors on the input side and ≥ 8 × 10µF on the output side;
• Soft start control: Connect a 47nF capacitor to the TRK pin to set the soft start slope (typical start time is 1.6ms);
• Thermal coupling design: It is recommended to solder the bottom surface of the module to a large area of GND copper layer, and ensure that the PCB multi-layer structure has sufficient thermal conductivity;
• Multi-mode parallel configuration: supports up to three modules in parallel. The EAO, EN, and TRK pins must be connected consistently, the EAIN feedback must remain independent, and the inductor parameters must be matched to ensure current sharing accuracy.

Thermal design performance and parallel capability

The PI3740-00-LGIZ supports parallel current sharing and implements dynamic current feedback through a built-in EAO pin and a high-side current sense amplifier. The thermal derating curves provided in the document show that, in non-ventilated conditions, the module maintains stable operation at 60V input, 50V output, and a 3A load.

The ZVS topology also enables lower switching noise, making it particularly suitable for systems requiring a low EMI power stage, such as ADCs or optical communication circuits.

Why is it better than discrete Buck or Boost architectures?

Compared to traditional discrete solutions built with a buck or boost controller and power MOSFETs, inductors, and capacitors, the PI3740-00-LGIZ offers the following advantages:

• Higher power density: All control, drive, and detection circuits are integrated into the module;
• Simpler wiring: only a small number of peripheral capacitors and feedback networks are required for operation;
• Comprehensive protection mechanisms: including OVP, UVLO, OTP, and Fast/Slow Current Limit;
• Saves design time: no need to build a PWM control loop or external synchronization circuit;
• Strong thermal balancing capability: bottom heat dissipation path + optimized packaging improves system thermal stability.

The PI3740-00-LGIZ is a highly integrated Buck-Boost module designed for medium- to high-power system scenarios. With its ZVS architecture, high efficiency, parallel capability, and simplified peripheral design, it provides robust and reliable power support in fields such as communications, industry, energy storage, and embedded platforms.

Its modular nature helps shorten design cycles, improve system consistency and manufacturability, and is suitable for platform-based development or building standard power subsystems. Currently in active supply, this product is available for long-term supply and volume deployment.

For datasheets, packaging specifications, or availability details on the PI3740-00-LGIZ, please visit the WIN SOURCE official website for comprehensive technical and sourcing support.

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