GENERAL DEscriptION

The SGM41528 is a battery charger and system power path management device for 2-cell Li-Ion or Li-polymer batteries. Its low-impedance power path optimizes efficiency, reduces battery charging time, and extends battery life. I2C programming makes it a flexible powering and charger design solution.

The SGM41528 can detect the input source types which include SDP/CDP/DCP and non-standard adapter through the D+/D- pins following USB BC1.2 Specification.

The SGM41528 features a dynamic power management (DPM) to avoid input adapter overloading or to meet the maximum current limit. It keeps the system voltage regulated to its minimum setting in DPM mode by reducing the charge current. The SGM41528 also provides supplement mode to further support system output in case that the charge current decreased to zero and input is still overload. The SGM41528 can provide the maximum power point with an algorithm called input current optimizer to avoid the input source from overloading.

The SGM41528 supports the default mode (standalone) without host control. It automatically detects the battery voltage and starts the charge. A charge cycle automatically terminates when a full charge is detected if the device is not in thermal regulation or DPM mode. The charger automatically initiates a new charging cycle if the battery voltage falls below the recharge threshold.

The SGM41528 supports USB On-The-Go (OTG) operation by supplying default 5.1V on the VBUS with an output current limit up to 2A.

The SGM41528 provides full protections for safety of battery charging and system operation, including battery temperature monitoring, charging safety timer, over-current and over-voltage protections. When any fault occurs, the SGM41528 asserts a nINT pulse to notify the host.

The SGM41528 is available in a Green WLCSP-2.1×2.1-25B package.

FEATURES

3.9V to 6.2V Operating Input Voltage Range

Up to 20V Sustainable Voltage

Fully Integrated All MOSFETs, Current Sense and Compensation

High Efficiency, 2A, 1.5MHz Boost Charger: Up to 92.5% Charge Efficiency with 1A Charge Current for 7.6V Battery Voltage

USB OTG with 4.5V to 5.5V Adjustable Output: Up to 2A Output, up to 94.5% Efficiency at 5.1V/1A Output

Selectable PFM Mode and Out-of-Audio (OOA) Mode at Light Load Operations

Narrow Voltage DC (NVDC) Power Path Management

I2C Port for Flexible System Parameter Setting and Status Reporting

Integrated ADC for Monitoring Input Voltage, Input Current, Battery Voltage, Charge Current, System Voltage, Battery Temperature and Die Temperature

High Battery Discharge Efficiency with 13mΩ Switch

USB BC1.2 and Non-Standard Input Source Adaptors Auto Detection

Input Current Optimizer (ICO) to Maximize Adaptor Output Current without Overloading

Programmable Input Current Limit (IINDPM) and Dynamic Power Management to Support USB Standard Adapters

Maximum Power Tracking by Programmable Input Voltage Limit (VINDPM)

Safety Features Including Configurable JEITA for Battery Temperature Protection

Battery Charging Safety Timer

Thermal Regulation and Thermal Shutdown

Watchdog Monitoring I2C Operation

VBUS/System/Battery Over-Voltage Protection

Output Over-Current Protection for Both Boost and OTG Buck Mode

APPLICATIONS

Smart Phones, EPOS

Portable Internet Devices and Accessory