BQ24740 - bq24740

BQ24740是TI德州仪器公司的一款电池充电器IC产品，BQ24740是bq24740，本站介绍了BQ24740的封装应用图解、特点和优点、功能等，并给出了与BQ24740相关的TI元器件型号供参考。

BQ24740 - bq24740 - 电池充电器IC - 电池管理产品 - 德州仪器

产品描述

The bq24740 is a high-efficiency, synchronous battery charger with integrated compensation, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.

The bq24740 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 bq24740 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 current-sense amplifier enables precise measurement of input current from the ac adapter to monitor the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its power performance according to what is available from the adapter.

产品特性

NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
High-Accuracy Voltage and Current Regulation
- ±0.5% Charge Voltage Accuracy
- ±3% Charge Current Accuracy
- ±3% Adapter Current Accuracy
- ±2% Input Current Sense Amp Accuracy
Integration
- Internal Loop Compensation
- Internal Soft Start
Safety
- Input Overvoltage Protection (OVP)
- Dynamic Power Management (DPM) with Status Indicator
Supports Two, Three, or Four Li+ Cells
5 - 24 V AC/DC-Adapter Operating Range
Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
- Charge Voltage (4-4.512 V/Cell)
- Charge Current (up to 10 A, with 10-m Sense Resistor)
- Adapter Current Limit (DPM)
Status and Monitoring Outputs
- AC/DC Adapter Present with Programmable Voltage Threshold
- Low Input-Power Detect with Adjustable Threshold and Hysteresis
- DPM Loop Active
- Current Drawn from Input Source
Battery Discharge Current Sense with No Adapter, or Selectable Low-Iq mode
Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
Charge Enable
10-µA Off-State Current
28-pin, 5x5-mm QFN package
APPLICATIONS
- Notebook and Ultra-Mobile Computers
- Portable Data-Capture Terminals
- Portable Printers
- Medical Diagnostics Equipment
- Battery Bay Chargers
- Battery Back-up Systems

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