SLUSA62A – OCTOBER 2010 – REVISED NOVEMBER 2010
Over-Voltage and Over-Current Charger
Protection IC With Integrated Charging FET and LDO Mode
Check for Samples: bq24351
•2 Robust Protection
– Input Over-Voltage Protection
– Input Over-Current Protection
– Accurate Battery Over-Voltage Protection
– Thermal Shutdown
– Output Short-Circuit Protection
• Integrated Charging FET
• 10.5V Over-Voltage Protection
• LDO Mode Operation
– 6.38V Output Voltage Regulation
• Current Limited Power Supply for Host
• Soft-Start to Prevent Inrush Currents
• Soft-Stop to Prevent Voltage Spikes
• 30V Maximum Input Voltage
• Supports Up to 1A Load Current
• Small 2mm × 2mm 8pin SON Package
• Mobile Phones
• Low-Power Handheld Devices
The bq24351 is a highly integrated circuit designed to provide protection to Li-ion batteries from failures of the
charging circuit. The IC continuously monitors the input voltage and the battery voltage. In case of an input
over-voltage condition, the IC will turn off the internal power FET after a blanking time. If the battery voltage rises
to unsafe levels during charging process, power is removed from the system. If the input current exceeds the
over current threshold for a limited time, the IC will turn off the output power. The integrated charging FET can
regulate the charge voltage and current according to the control from the host. The device can also provide a
voltage source with over voltage and over current protection for host controller.
TYPICAL APPLICATION CIRCUIT
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