## Overview of the IP5328P The **IP5328P** is a highly integrated power management SOC (System on Chip) designed specifically for fast-charging power banks. It supports multiple fast-charging protocols and handles battery charging, voltage boosting, and LED display functions in a single package. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 4.5V to 13.5V | | **Battery Voltage** | 4.2V / 4.3V / 4.35V / 4.4V (Adjustable) | | **Output Current** | Up to 5V@3.1A, 9V@2.0A, 12V@1.5A | | **Efficiency** | Up to 95% (at 5V/2A) | | **Interface Support** | USB-A (x2), USB-C, Micro-USB, Lightning | | **Package** | QFN40 (6mm x 6mm) | --- ### 2. Supported Fast Charging Protocols The IP5328P is popular because it acts as a "universal" charger chip, supporting: * **PD 2.0 / PD 3.0** (Power Delivery) * **Qualcomm QC 2.0 / QC 3.0** * **Huawei FCP** (Fast Charge Protocol) * **Samsung AFC** (Adaptive Fast Charging) * **MTK PE+ 1.1 & 2.0** (Pump Express) --- ### 3. Functional Blocks 1. **Synchronous Switching Regulator:** A bi-directional DC-DC converter. It acts as a buck converter during charging and a boost converter during discharging. 2. **Battery Management:** Includes constant current (CC) and constant voltage (CV) charging profiles. It also monitors battery temperature via an NTC thermistor. 3. **Protocol Controller:** Automatically negotiates with the connected device to provide the highest safe voltage (e.g., 9V or 12V). 4. **Peripheral Drivers:** Built-in 14-bit ADC for power calculation and drivers for 4 LEDs or a digital display to show battery percentage. --- ### 4. Typical Application Circuit Components To build a circuit with the IP5328P, you generally need these supporting parts: * **Inductor:** Typically a **1.0µH to 2.2µH** power inductor capable of handling 7A+ peak current. * **Capacitors:** Low-ESR ceramic capacitors (22µF or 47µF) for input/output filtering. * **MOSFETs:** Usually integrated, but some designs use external MOS for power path selection between different USB ports. * **NTC Resistor:** A 10kΩ thermistor placed near the battery to prevent charging if the battery is too hot or cold. --- ### 5. Safety Protections * Input Overvoltage / Undervoltage Protection * Output Overcurrent / Short Circuit Protection * Battery Overcharge / Over-discharge Protection * IC Over-temperature Protection (OTP)