SY20774QCC - 5A, Single Cell Li-Ion DC/DC Switching Charger with I2C Control, USB Detection and OTG JEITA Compliant, Power Path Management
Features
- High Efficiency 5A 1.5MHz Buck Mode Charger
–Programmable IDPM/VDPM to Support the USB and Adapter
–Support USB SDP/DCP/CDP and Non-Standard Adapter Detection
–3.84-4.608V Adjustable Charge Voltage
–Support Narrow VDC Power Path Management
–JEITA Compliance
–±0.5% Charge Voltage Regulation
–Accelerate Charge Time by Battery Path Impedance Compensation
–Charge Status Outputs for LED or Host Processor
- Maximum 2.4A 500KHz/1.5MHz Boost OTG Current
–Selectable OTG Output Current Limit
–Up to 2.4A OTG Current Limit on BUS
–±1.5% Output Regulation in Boost Mode
- Battery Monitor for Voltage, Temperature and Charge Current Measurements
- Full BATFET Control to Support Shipping Mode, Wake Up, and System Reset
- Up to 9A Battery Discharge Current
- Safety
–Battery Charging Safety Timer
–Thermal Regulation and Thermal Shutdown
–Input/System Over-voltage Protection
–MOSFET Over-current Protection
- Low Battery Leakage Current and Support Shipping Mode
- 4mm x 4mm QFN-24 Package
Typical Application
Description
The SY20774 is a fully-integrated switching battery charger with system power path management devices for single cell Li-Ion and Li-polymer battery in a wide range of tablet and other portable devices. Its low impedance power path optimizes switching conversion efficiency, reduces battery charging time and extends battery life during the discharging mode. The I2C serial interface with charging and system settings makes the device a truly flexible solution.
The device supports a wide range of input sources, including standard USB host port, USB charging port and non-standard DC adapter. The SY20774 takes the result from the internal USB port identification circuit thru DP/DM compliant with BC1.2. The SY20774 can be compliant with USB 2.0 and USB 3.0 power spec with input current and voltage regulation. Meanwhile, the SY20774 meets USB On-the-go operation power rating specification by supplying 5V (programmable) on BUS with current limit up to 2.4A (programmable).
The power path management regulates the system voltage slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable). With this feature, the switching converter will keep working to support the system load even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management will reduce the charging current to zero firstly. If the system load continues to increase, the power path will discharge the battery to provide the power required by system. This supplement mode operation prevents overloading the input source.
The device initiates and completes a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: preconditioning, constant current and constant voltage. At the end of the charging cycle, the charger will automatically be terminated when the charge current is below a preset limit in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle. The SY20774 can be compliant with JEITA spec for the Li-Ion battery.
The device provides various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C(programmable).
The STAT output reports the charging status and any fault conditions. The INT immediately notifies the host when a fault occurs.
The SY20774 is available in QFN4x4-24 package.
Applications
- Smart Phone
- Tablet PC
- Power Bank
- Portable Internet Devices