TI BQ24140YFFR

The bq24140 is a compact, flexible, highly efficient, USB-friendly switch-mode charge management device for single-cell Li-Ion and Li-Polymer batteries used in a wide range of portable applications. Charge parameters are programmable via the I²C interface. This IC integrates two synchronous PWM controllers, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination functions into a small WCSP package.

Battery charging occurs in three phases: conditioning, constant current, and constant voltage. Input current is automatically limited by the host. Charging terminates when a user-selectable minimum current level is reached. A safety timer with reset control provides a safety backup for the I²C interface. Under normal operation, if the battery voltage drops below an internal threshold, the IC automatically restarts the charge cycle; when input power is removed, the IC automatically enters sleep mode or high-impedance mode. Charge status can be reported to the host via the I²C interface. During charging, the IC monitors its junction temperature (TJ) and reduces the charge current once TJ rises to a typical value of 125°C. To support USB OTG devices, the IC can boost the battery voltage to provide VBUS (typical 5.05V). This IC is available in a 30-pin WCSP package.

• High-efficiency mini USB/AC battery charger for single-cell Li-Ion and Li-Polymer battery packs, providing USB-OTG support while charging the battery
• High-accuracy voltage and current regulation
• Input current regulation accuracy: ±5% (100mA, 500mA)
• Charge voltage regulation accuracy: ±0.5% (25°C), ±1% (0 - 125°C)
• Charge current regulation accuracy: ±5%
• Boost mode operation for USB OTG: input voltage range (battery-powered): 2.3V to 4.5V, VBUS output: 5.05V/500 mA
• Input voltage-based current limiting via Dynamic Power Management
• Adapter protection fault detection and suppression
• Additional safety via safety limit registers restricting maximum charge voltage and maximum charge current
• 20-V absolute maximum input voltage rating
• 9.0-V maximum operating input voltage
• Faster charging than linear chargers
• Built-in input current sensing and limiting
• Integrated power FET, charge rate up to 1.5A
• Programmable charge parameters configurable via I²C interface (up to 3.4 Mbps): input current, fast charge/termination current, charge voltage (3.5 - 4.44V), safety timer with reset control, termination enable

• Mobile phones & smartphones
• MP3 players
• Handheld devices