1. Product Overview****
The ZCC7890 is a high-performance, low-power dual-phase synchronous buck controller designed for high-efficiency, high-density power conversion applications. It supports a wide input voltage range (4V to 60V) and can achieve output voltages up to 99% of VIN with an extremely low quiescent current of only 5µA. This makes it highly suitable for power systems that require high efficiency and high power density.
2. Features****
· Wide Input Voltage Range: 4V to 60V.
· High Efficiency: Capable of achieving output voltages up to 99% of VIN.
· Low Quiescent Current: Only 5µA, which helps extend battery life or reduce standby power consumption.
· Dual-Phase Operation: Supports dual-phase buck conversion to enhance power density and efficiency.
· High Switching Frequency: Capable of operating up to 3MHz, allowing the use of smaller inductors and capacitors.
· Synchronous Rectification: Supports N-channel MOSFET synchronous rectification to improve efficiency.
· Multiple Protection Functions: Including overcurrent protection, overvoltage protection, and undervoltage lockout, ensuring safe and reliable system operation.
3. Applications****
· Telecommunications Power Supplies: Suitable for base stations and data centers that require high-efficiency power conversion.
· Industrial Power Supplies: Provides stable power support for various industrial equipment.
· Automotive Electronics: Meets the high-efficiency and high-reliability power requirements of automotive electronic systems.
Consumer Electronics: Used in power adapters for portable devices such as laptops and tablets. 5. Operating Principle****
The ZCC7890 uses an internal PWM controller and driver circuit to precisely control a dual-phase buck converter. It dynamically adjusts the switching frequency and duty cycle based on the input voltage and load current to achieve high-efficiency power conversion. Additionally, the ZCC7890 includes multiple protection features, such as overcurrent protection, overvoltage protection, and undervoltage lockout, ensuring safe and reliable operation under various conditions.
6. Design Considerations****
· PCB Layout: It is recommended to place the top N-channel MOSFETs close to the input capacitors to minimize parasitic inductance and resistance. Also, ensure that all high-speed switching nodes (e.g., SW1, SW2) are kept away from sensitive feedback signal nodes.
· Capacitor Selection: Use low ESR (Equivalent Series Resistance) ceramic or solid-state capacitors for input and output capacitors to improve the power supply's dynamic response and stability.
· Driver Power Supply: The DRVCC pin should be connected to INTVCC via a separate trace, and a 4.7µF to 10µF ceramic capacitor should be placed between INTVCC and GND to ensure stable driver power supply.
7. Typical Applications****
· Dual-Phase Buck Converter: By properly configuring the pins and external components of the ZCC7890, a high-efficiency, high-power-density dual-phase buck converter can be implemented, suitable for various power supply applications.
· Multi-Output Power Supply: Utilizing the multi-phase control capabilities of the ZCC7890, a power supply system with multiple outputs can be designed to meet the power requirements of different devices.
8. Related Products****
The ZCC7890 is similar in function or compatible with the following products:
· ZCC3890: A 60V input, low quiescent current, dual-phase buck controller suitable for applications requiring low power consumption and high efficiency.
· ZCC7800: A 60V input, low quiescent current, high-frequency synchronous buck controller supporting up to 2.25MHz switching frequency.
9. Ordering Information****
· Package Type: 32-pin QFN.
· Operating Temperature Range: -40°C to +125°C.
· Ordering Code: ZCC7890QFN32.
