**ADP5061ACBZ-5-R7: A 200 mA Single-Cell Li-Ion Battery Charger with Integrated LDO and I²C Interface**

In the realm of portable electronics, efficient and intelligent power management is paramount. The **ADP5061ACBZ-5-R7** from Analog Devices stands out as a highly integrated, feature-rich solution designed specifically for charging single-cell Li-Ion and Li-Polymer batteries. This compact IC combines a **full-featured linear battery charger** capable of delivering up to **200 mA** of charge current with a dedicated **150 mA Low-Dropout (LDO) regulator**, all controllable via a sophisticated **I²C interface**.

The core functionality of the ADP5061 is its precision charging circuit. It implements a complete **constant-current (CC)/constant-voltage (CV)** charging profile with programmable termination. The **charge current can be precisely set from 7.5 mA to 200 mA** in fine steps through the I²C bus, allowing designers to tailor the charging speed to the thermal and capacity constraints of their specific application. Similarly, the termination current threshold is also programmable, ensuring the battery is charged to its full capacity safely. The charger supports operation from a wide input voltage range of 3.75 V to 5.5 V, making it compatible with common USB power sources.

A key differentiator of this IC is its integrated **150 mA LDO regulator**. This provides a stable, always-on output voltage, typically **1.8V or 3.3V (ADP5061ACBZ-5-R7 provides 3.3V)**, which can be used to power critical system components like a real-time clock (RTC), microcontroller (MCU), or other low-power circuitry **even when the main system is powered down or the battery is completely drained**. This eliminates the need for an external LDO, saving valuable board space and reducing the total Bill of Materials (BOM).

The **I²C interface is the brain of the operation**, offering unparalleled control and monitoring capabilities. Designers can not only set charge parameters but also read back vital system status information. This includes flags indicating **charging status (e.g., trickle charge, constant current, constant voltage, charge complete)**, thermal regulation status, and various fault conditions like input overvoltage or battery temperature out of range. This level of intelligence enables sophisticated system power management, allowing the host processor to make informed decisions based on the charger's status.

Built-in safety features are comprehensive. The IC includes **battery temperature monitoring** using an external NTC thermistor, input overvoltage protection (OVP), a built-in charge timer for safety termination, and thermal regulation to automatically reduce charge current if the junction temperature exceeds ~120°C, ensuring reliable and safe operation under all conditions.

Housed in a tiny **2.30 mm × 2.15 mm, 0.4 mm pitch, 12-ball WLCSP** package, the ADP5061 is ideal for space-constrained applications such as wearable devices, medical sensors, Bluetooth headsets, and other compact, battery-powered IoT endpoints.

**ICGOODFIND**: The ADP5061ACBZ-5-R7 is a superior choice for compact, feature-driven designs. Its **integration of a programmable charger, a system LDO, and a digital interface** into one minuscule package provides a powerful, flexible, and space-saving power management solution that simplifies design and enhances end-product functionality.

**Keywords**:

* **Li-Ion Battery Charger**

* **I²C Interface**

* **Integrated LDO**

* **Programmable Charging**

* **Wearable Electronics**