The **ADP5360ACBZ-1-R7** is a highly integrated Power Management Unit (PMU) designed primarily for low-power, wearable, and medical devices. It combines multiple power conversion stages and battery management functions into a single, compact Wafer Level Chip Scale Package (WLCSP). --- ## 1. Key Component Overview The ADP5360 is essentially a "system-on-a-chip" for power. It integrates five main functional blocks: | Component | Description | | :--- | :--- | | **Linear Battery Charger** | Supports Li-Ion and Li-Polymer batteries with programmable charging current. | | **Buck Regulator** | A high-efficiency step-down converter (typically for the main system processor). | | **Buck-Boost Regulator** | Provides a stable output even if the battery voltage drops below the target output. | | **Battery Fuel Gauge** | Uses a voltage-based algorithm to estimate remaining battery capacity. | | **Supervisory Circuits** | Includes a power-on reset (POR), watchdog timer, and ship mode logic. | --- ## 2. Technical Specifications Below are the critical electrical characteristics of the device: | Parameter | Value / Range | | :--- | :--- | | **Input Voltage (VBUS)** | 4.0V to 6.75V | | **Battery Voltage Range** | 2.5V to 4.5V | | **Buck Output Current** | Up to 300 mA | | **Buck-Boost Current** | Up to 300 mA | | **Quiescent Current** | ~0.60 µA (In ship mode) | | **Interface** | I2C Compatible (for programming and telemetry) | | **Package** | 32-ball WLCSP (2.56 mm × 2.56 mm) | --- ## 3. Advanced Features ### A. Ultra-Low Quiescent Current ($I_Q$) The device is optimized for "Always-on" applications. Its extremely low standby current significantly extends the shelf life of battery-powered products when they are in "Ship Mode." ### B. Voltage-Based Fuel Gauge Unlike traditional Coulomb counters that require a sense resistor (which wastes power), the ADP5360 uses a proprietary algorithm to report the State of Charge (SOC) based on battery voltage and load trends. ### C. Protection & Safety * **Thermal Regulation:** Limits charge current if the die temperature rises. * **Watchdog Timer:** Can reset the system if the main microcontroller stops responding. * **Ship Mode:** Completely disconnects the battery from the system to prevent drainage during shipping. --- ## 4. Typical Application Circuit The device requires minimal external components, usually consisting of: 1. **Inductors:** Two small chip inductors (one for Buck, one for Buck-Boost). 2. **Capacitors:** Decoupling capacitors for input and output rails. 3. **Thermistor:** An NTC resistor connected to the battery to monitor temperature. ```c // Example I2C interaction (Pseudo-code) void setup_adp5360() { write_reg(PMOD_CTRL, 0x01); // Enable Buck Regulator write_reg(CHG_CNFG1, 0x0A); // Set Charge Current to 100mA } ``` ---