ZHCS384H November 2011 – July 2022 BQ24160 , BQ24160A , BQ24161 , BQ24161B , BQ24163 , BQ24168
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Charge Mode Operation
- 8.3.2 Battery Charging Process
- 8.3.3 Battery Detection
- 8.3.4 Dynamic Power Path Management (DPPM)
- 8.3.5 Input Source Connected
- 8.3.6 Battery Only Connected
- 8.3.7 Battery Discharge FET (BGATE)
- 8.3.8 DEFAULT Mode
- 8.3.9 Safety Timer and Watchdog Timer (BQ24160/BQ24161/BQ24161B/BQ24163 only)
- 8.3.10 D+, D– Based Adapter Detection for the USB Input (D+, D–, BQ24160/0A/3)
- 8.3.11 USB Input Current Limit Selector Input (PSEL, BQ24161/161B/168 only)
- 8.3.12 Hardware Chip Disable Input (CD)
- 8.3.13 LDO Output (DRV)
- 8.3.14 External NTC Monitoring (TS)
- 8.3.15 Thermal Regulation and Protection
- 8.3.16 Input Voltage Protection in Charge Mode
- 8.3.17 Charge Status Outputs (STAT, INT)
- 8.3.18 Good Battery Monitor
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Maps
- 8.6.1 Status/Control Register (READ/WRITE)
- 8.6.2 Battery/ Supply Status Register (READ/WRITE)
- 8.6.3 Control Register (READ/WRITE)
- 8.6.4 Control/Battery Voltage Register (READ/WRITE)
- 8.6.5 Vender/Part/Revision Register (READ only)
- 8.6.6 Battery Termination/Fast Charge Current Register (READ/WRITE)
- 8.6.7 VIN-DPM Voltage/ DPPM Status Register
- 8.6.8 Safety Timer/ NTC Monitor Register (READ/WRITE)
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
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8.3.1.1 Charge Profile
The internal battery MOSFET is used to charge the battery. When the battery is above the MINSYS voltage, the internal FET is on to maximize efficiency and the PWM converter regulates the charge current into the battery. When battery is less than MINSYS, the SYS is regulated to VSYS(REG) and battery is charged using the battery FET to regulate the charge current. There are 5 loops that influence the charge current:
- Constant current loop (CC)
- Constant voltage loop (CV)
- Thermal-regulation loop
- Minimum system-voltage loop (MINSYS)
- Input-voltage dynamic power-management loop (VIN-DPM)
During the charging process, all five loops are enabled and the one that is dominant takes control. The BQ2416xx supports a precision Li-ion or Li-polymer charging system for single-cell applications. The Dynamic Power Path Management (DPPM) feature regulates the system voltage to a minimum of VMINSYS, so that startup is enabled even for a missing or deeply discharged battery. Figure 8-1 shows a typical charge profile including the minimum system output voltage feature.
Figure 8-1 Typical BQ2416xx Charging
Profile