BQ24751A中文资料具有低 Iq 且具有系统电源选择器的主机控制型 2 至 4 节降压电池充电控制器数据手册TI规格书

描述 Description

The bq24751A is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.The bq24751A charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package. The bq24751A controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current. This AC Over-Power protection (ACOP) feature limits the input-switch power to the programmed level on the ACOP pin, and latches off if the high-power condition persists to prevent overheating. The bq24751A features Dynamic Power Management (DPM) and input power limiting. These features reduce 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. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.

特性 Features

• NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
• High-Accuracy Voltage and Current Regulation
• ±3% Charge Current Accuracy
• ±2% Input Current Sense Amp Accuracy
• Integration
• Internal Loop Compensation
• Safety
• Dynamic Power Management (DPM) with Status Indicator
• Reverse-Conduction Protection Input FET
• Supports Two, Three, or Four Li+ Cells
• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
• Charge Current (up to 10 A, with 10-m sense resistor)
• Status and Monitoring Outputs
• Current Drawn from Input Source
• Battery Learn Cycle Control
• Charge Enable
• Energy Star Low Iq
• APPLICATIONS
• Portable Data Capture Terminals
• Medical Diagnostics Equipment
• Battery Back-up Systems