3MHz Synchronous Switch-Mode Battery Charger with Full USB Compliance and USB-OTG Boost Regulator

Features

• Charge Faster Than Linear Charger
• 3MHz with 0% to 99.5% Duty Cycle Synchronous Switch-Mode Charger with 1.5A Integrated N-MOSFETs
• 4V-6V Input Operating Range
• 20V Absolute Maximum Input Voltage
• Safety

- Reverse leakage protection to prevent battery drainage
- Thermal regulation and protection
- Input/output over-voltage protection
- Cycle-by-cycle current limit

• Accuracy

- ±1% charge voltage regulation (0 to 85°C)
- ±5% charge current regulation
- ±5% input current regulation (100mA and 500mA)

• Built-In Input Current Sensing and Limiting
• Automatic Charging
• Programmable Through High-Speed I²C Interface (3.4Mb/s)

- Input Current Limit
- Fast-Charge and Termination Current
- Charge Regulation Voltage
- Weak Battery Voltage Threshold
- VIN DPM Threshold
- Termination Enable/Disable
- OTG Enable/Disable
- Reset All Parameter Control
- Safety Timer with Reset Control

• 5V, 500mA Boost Mode for USB OTG for 2.5V to 4.5V Battery Input
• Available in 1.7mmx2.1mm WLCSP-20 and TQFN4x4-20A Packages

General Description
The APW7262 combine switch-mode battery charger and a boost regulator with fixed 3MHz switching frequency, which drives two integrated N-channel power MOSFETs. In battery charging, the high-efficiency step-down DC/DC converter is capable of delivering 1.5A output current over a wide input voltage range from 4V to 6V for APW7262, the step-down DC/DC converter is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery. The Charging parameters and operating modes can be programmed through an I²C interface. The APW7262 has high accuracy regulation of input current, charge current and charge voltage. It equipped with charge termination, and charge status monitoring for battery detection. The APW7262 charge the battery in three phases: conditioning, constant current and constant voltage. The APW7262 features Dynamic Power Management (DPM) mode to accomplish input power limiting. The input current is limited to the value set by the I²C host. This feature reduces battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. The charge termination is based on battery voltage, a programmed minimum current level and charge current termination bit set by the I²C host. If the battery voltage falls below an internal threshold, the APW7262 automatically restarts the charge cycle, and when the input voltage falls below the battery voltage, it will enter a low-quiescent current sleep mode. The APW7262 supports the thermal regulation and over temperature protection to maintain the junction temperature of 120°C by reducing charge current. The APW7262 can operate as a boost regulator. To support USB OTG device, APW7262 can provide VBUS (5.05V) by boosting the battery voltage. The APW7262 is available in 1.7mmx2.1mm WLCSP-20 and TQFN4x4-20A packages.

I2C Controlled 3A Single Cell USB Charger with Narrow VDC Power Path Management and USB OTG

Features

• High Efficiency 3A Switch Mode Charge
• Single Input USB-compliant/Adapter Charge

- Input Voltage and Current Limit Supports USB 2.0 and USB 3.0
- Input Current Limit : 100mA, 150mA, 500mA, 900mA, 1A, 1.5A, 2A and 3A

• 3.9V - 6.2V Input Operating Voltage Range

- Support Adapter with Input Voltage DPM Regulation

• USB OTG with Adjustable Output 4.55V to 5.5V at 1 A or 1.5A

- Accurate +/- 15%
- Hiccup Mode Overcurrent Protection

• Narrow VDC (NVDC) Power Path Management

- Instant-on Works with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode

• 1.5MHz Switching Frequency for Low Profile Inductor
• Autonomous Battery Charging with or without Host Management

- Battery Charge Enable
- Battery Charge Preconditioning
- Charge Termination and Recharge

• Accuracy

- ±0.5% Charge Voltage Regulation
- ±7% Charge Current Regulation
- ±7.5% Input Current Regulation
- ±3% Output Regulation in Boost Mode

• High Integration

- Power Path Management
- Synchronous Switching MOSFETs
- Integrated Current Sensing
- Internal Loop Compensation

• Safety

- Battery Temperature Sensing for Charging and Discharging in OTG Mode
- Battery Charging Safety Timer
- Thermal Regulation and Thermal Shutdown
- Input System Over-Voltage Protection
- MOSFET Over-Current Protection

• Charge Status Outputs for LED or Host Processor
• Maximum Power Tracking capability by Input Voltage Regulation
• 32µA Low Battery Leakage Current and Support Shipping Mode
• TQFN 4x4 Package
• Lead Free and Green Devices Available (RoHS Compliant)

General Description
The APW7264 is a highly-integrated switch-mode battery charge management and system power path management device 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 switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution. The device supports 3.9V - 6.2V USB input sources, including standard USB host port and USB charging port with 6. 4V over-voltage protection. The device supports USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the APW7264 takes the result from the detection circuit in the system, such as USB PHY device. The device also supports USB On-the-Go operation by providing fast startup and supplying adjustable voltage 4.55 ˇV 5.5V (default 5V) on the VBUS with an accurate current limit up to 1.5A. The power path management regulates the system slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable). With this feature, the system keeps operating even when the battery is completely depleted or removed. When the input source current or voltage limit is reached, the power path management automatically reduces the charge current to zero and then starts discharges the battery until the system power requirement is met. This supplement mode operation keeps the input source from getting overloaded. The device initiates and completes a charging cycle when host control is not available. It automatically charges the battery in three phases: pre-conditioning, constant current and constant voltage. In the end, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on, when the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charge 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 host when fault occurs. The APW7264 is available in a 24-pin, 4x4 mm² thin QFN package.