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
9.3.4.1.3 Battery Supplement Mode
While in DPPM mode, if the charging current falls to zero and the system load current increases beyond the programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the VBSUP1 threshold, the battery supplements the system load. The battery stops supplementing the system load when the voltage at OUT rises above the VBSUP2 threshold.
During supplement mode, the battery supplement current is not regulated (BAT-FET is fully on), however there is a short circuit protection circuit built in. Figure 10-6 demonstrates supplement mode. If during battery supplement mode, the voltage at OUT drops VO(SC2) below the BAT voltage, the OUT output is turned off if the overload exists after tDGL(SC2). The short circuit recovery timer then starts counting. After tREC(SC2), OUT turns on and attempts to restart. If the short circuit remains, OUT is turned off and the counter restarts. Battery termination is disabled while in supplement mode.
Figure 9-4 BQ24072 DPPM and Battery Supplement Modes (VOREG = VBAT + 225 mV, VBAT = 3.6 V)
Figure 9-5 BQ24073 DPPM and Battery Supplement Modes (VOREG = 4.4 V, VBAT = 3.6 V)