SLUSFR7 August 2025 BQ24810
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Pin Configuration and Functions
- 5 Specifications
-
6 Detailed Description
- 6.1 Overview
- 6.2 Functional Block Diagram
- 6.3
Feature Description
- 6.3.1 Device Power Up
- 6.3.2 System Power Selection
- 6.3.3 Current and Power Monitor
- 6.3.4 Processor Hot Indication for CPU Throttling
- 6.3.5 Input Current Dynamic Power Management
- 6.3.6 Two-Level Adapter Current Limit (Peak Power Mode)
- 6.3.7 EMI Switching Frequency Adjust
- 6.3.8 Device Protections Features
- 6.4 Device Functional Modes
- 6.5 Programming
- 6.6
Register Maps
- 6.6.1 Battery-Charger Commands
- 6.6.2 Setting Charger Options
- 6.6.3 ChargeOption1 Register
- 6.6.4 ChargeOption2 Register
- 6.6.5 ChargeOption3 Register
- 6.6.6 ChargeOption4 Register
- 6.6.7 ProchotOption0 Register
- 6.6.8 ProchotOption1 Register
- 6.6.9 ProchotStatus Register
- 6.6.10 Charge Current Register
- 6.6.11 Charge Voltage Register
- 6.6.12 Discharge Current Register
- 6.6.13 Minimum System Voltage Register
- 6.6.14 Input Current Register
- 6.6.15 Register Exceptions
-
7 Application and Implementation
- 7.1 Application Information
- 7.2
Typical Applications
- 7.2.1
Typical System Schematic
- 7.2.1.1 Design Requirements
- 7.2.1.2
Detailed Design Procedure
- 7.2.1.2.1 Adapter Current Sense Filter
- 7.2.1.2.2 Negative Output Voltage Protection
- 7.2.1.2.3 Reverse Input Voltage Protection
- 7.2.1.2.4 Reduce Battery Quiescent Current
- 7.2.1.2.5 CIN Capacitance
- 7.2.1.2.6 L1 Inductor Selection
- 7.2.1.2.7 CBATT Capacitance
- 7.2.1.2.8 Buck Charging Internal Compensation
- 7.2.1.2.9 CSYS Capacitance
- 7.2.1.2.10 Battery Only Boost Internal Compensation
- 7.2.1.2.11 Power MOSFETs Selection
- 7.2.1.2.12 Input Filter Design
- 7.2.1.3 Application Curves
- 7.2.2 Migration from Previous Devices (Does Not Support Battery Only Boost)
- 7.2.1
Typical System Schematic
- 7.3 Power Supply Recommendations
- 7.4 Layout
- 8 Device and Documentation Support
- 9 Revision History
- 10Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
請(qǐng)參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- RUY|28
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購信息
6.3.5.1 Setting Input Current Limit
System current normally fluctuates as portions of the system are powered-up or put to sleep. With the input current limit, the current draw from the AC wall adapter is limited to a set level to avoid overloading the adapter.
The total input current, from a wall adapter or other DC source, is the sum of the system current and current required to charge the battery. When the input current exceeds the set input current limit, the BQ24810 device decreases the charge current to provide priority to the system load. As the system current rises, the available charge current drops to 0. If the system load increases further after charging current has been reduced to 0, the charger goes into hybrid power boost mode and adds battery power to support the system load, maintaining the input current limit.
During DPM regulation, the total input current is the sum of the device supply current IBIAS, the charger input current, and the system load current ILOAD, and can be estimated as follows:
In the above equation, η is the efficiency the switching regulator and IBATTERY is the battery charging or discharging current (positive for charging and negative for discharging). In charging mode, the charger converter is in buck configuration. In hybrid power boost mode, the charger converter is in boost configuration.
To set the input current limit, write a 16-bit InputCurrent() command (REG0x3F) using the data format listed in Table 6-19. When using a 10-m? sense resistor, the BQ24810 device provides an input-current limit range of 64 mA to 8.128 A, with 64-mA resolution. Upon POR, default input current limit is 4096 mA on 10-mΩ current sensing resistor (RAC). Additionally, when 0 mA or a value above 8.128A is written, the write is considered invalid and is not written to the register.
The ACP and ACN pins are used to sense RAC with default value of 10 mΩ. However, resistors of other values can also be used. The actual current is scaled by the ratio of 10 mΩ and RAC. For example, the input current setting code of 4096mA on 10 mΩ becomes 2048mA if sense resistor is 20 mΩ. For a larger sense resistor, larger sense voltage is given, and higher regulation accuracy, but at the expense of higher conduction loss and a more narrow current range. For a smaller sense resistor (5 mΩ, 4 mΩ..etc), smaller sense voltage is given, and lower regulation accuracy, but at the benefits of lower conduction loss and a wider current regulation range can be achieved.