ZHCSIF0N September 2008 – October 2021 BQ24072 , BQ24073 , BQ24074 , BQ24075 , BQ24079
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 說明（續）
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Undervoltage Lockout (UVLO)
- 9.3.2 Power On
- 9.3.3 Overvoltage Protection (OVP)
- 9.3.4 Dynamic Power Path Management
- 9.3.5
Battery Charging
- 9.3.5.1 Charge Current Translator
- 9.3.5.2 Adjustable Termination Threshold (ITERM Input, BQ24074)
- 9.3.5.3 Termination Disable (TD Input, BQ24072, BQ24073)
- 9.3.5.4 Battery Detection and Recharge
- 9.3.5.5 Battery Disconnect (SYSOFF Input, BQ24075, BQ24079)
- 9.3.5.6 Dynamic Charge Timers (TMR Input)
- 9.3.5.7 Status Indicators ( PGOOD, CHG)
- 9.3.5.8 Thermal Regulation and Thermal Shutdown
- 9.3.6 Battery Pack Temperature Monitoring
- 9.4 Device Functional Modes
-
10Application and Implementation
- 10.1 Application Information
- 10.2 Typical Application
- 10.3 System Examples
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.3.5.1 Charge Current Translator
When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external charge current programming resistor, RISET, generates an analog voltage that can be monitored by an external host to calculate the current sourced from BAT.
Equation 3. VISET = ICHARGE / 400 × RISET
Figure 9-7 Battery Charging Flow Diagram