TI HPA02196RGRR

The bq24735 is a high-efficiency synchronous battery charger that offers a low component count for battery charging applications with space constraints and various battery chemistries. When the system's power supply demand temporarily exceeds the adapter's maximum power supply level, the bq24735 uses intelligent boost technology to allow the battery to release energy into the system, thus protecting the adapter from damage. To meet the need for automatic system power selection, the bq24735 uses two charge pumps to drive n-channel MOSFETs (ACFET, RBFET, and BATFET) respectively. The SMBus-controlled input current, charging current, and charging voltage DACs allow for very high regulation accuracy, which can be easily programmed via the system power management microcontroller. The bq24735 uses an internal input current register or an external ILIM pin to slow down the PWM modulation speed and reduce the charging current. The bq24735 charges 1-, 2-, 3-, or 4-series Li+ batteries and comes in a 20-pin, 3.5×3.5 mm² QFN package.

• Adapter and battery jointly power the system to support Intel CPU Intelligent Turbo mode
• Automatic N-channel MOSFET selection for system power from adapter or battery driven by internal charge pump
• Programmable input current, charge voltage, charge current limit ±0.5% charge voltage accuracy up to 19.2V, ±3% charge current accuracy up to 8.128A, ±3% input current accuracy up to 8.064A, ±2% 20x adapter current or charge current amplifier output accuracy
• Programmable battery depletion threshold and battery learning function
• Programmable adapter detection and indicator
• Integrated soft-start
• Integrated loop compensation
• Real-time system control on ILIM pin to limit discharge current
• AC adapter operating range 4.5V to 24V
• 5μA shutdown battery discharge current
• 0.65mA (max 0.8mA) adapter standby quiescent current
• 20-pin 3.5×3.5 mm² QFN package

• Portable notebooks, UMPCs, ultra-thin laptops, and notebook computers
• Handheld terminal devices
• Industrial and medical equipment
• Portable devices