2A Li-ion Battery Switching Charger with Integrated OTG Boost

Overview

The HL7022 is a compact, flexible, high-efficiency, USB compliant switch-mode charge management device for single cell Li-ion and Li-polymer battery used in a wide range of portable applications. The charge parameters can be programmed through I²C interface. The HL7022 integrates a synchronous PWM controller, power MOSFET, input current sensing, high-accuracy current and voltage regulation, and charge termination function into a tiny CSP package.

The HL7022 provides a complete automatic three-phase battery charging control: trickle charge, constant-current charge (CC), and constant voltage charge (CV) until the battery reaches the charge termination voltage. The input current is automatically limited to the value set by the host. Charging is terminated based on the battery voltage and a user selectable minimum current level. A safety timer with reset control provides a safety backup for I²C interface. During normal operation, the IC automatically restarts the charge cycle if battery voltage falls below an internal threshold and automatically enters a sleep mode or a high impedance mode when input supply is not correctly connected. The charge status can be reported to the host through the I²C interface.

During the charging process, the IC monitors its junction temperature (T_J) and reduces the charge current once T_J increases to about 120°C. To support USB OTG device, the HL7022 can provide VBUS (5.0V) by boosting the battery voltage.

Features

• Fully automatic and efficient charge management for a large capacity lithium battery
  • Automatic conditioning, CC/CV charge control, termination, and recharge
  • Support 2A charge current using 33mW sensing resistor
  • 3MHz Synchronous PWM, 1µH low profile inductor
  • Input current regulation accuracy: ±5% (100mA and 500mA)
  • Charge voltage regulation accuracy:
    • -0.25%-0.41% (25°C)
    • ±1% (0°C to 85°C)
    • ±2% (0°C to 125°C)
  • 20V Input voltage tolerance, 6.3V max operating voltage
  • Input voltage based dynamic power management (VIN DPM)
  • Optional 32s/30 minutes safety timer with reset control
  • Power up without battery
• Automatic adapter fault detection
• High impedance mode with low power consumption
• Comprehensive protections
  • Reverse battery leakage protection
  • Thermal regulation and shutdown
  • Input & output over-voltage protection
• Built-in input current and input voltage limit
• Automatic charge and USB compliant start sequence
• Full range programmable charge parameter through I²C compatible interface
  • Input current limit threshold
  • Input voltage DPM threshold
  • Charge termination current
  • Charge termination voltage
  • Charge termination enable
  • Support 3.4MHz I²C HS mode
• USB OTG boost
  • Input voltage range from battery: 2.5-4.5V
  • 5.0V/400mA (V_BAT ≥ 3.0V)
• 3mm x 3mm DFN package

For more information or a full datasheet request, please contact the factory at sales@halomicro.com.