ZHCSDI4D March 2015 – October 2022 BQ25890 , BQ25892
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 Functional Block Diagram
- 9.2
Feature Description
- 9.2.1 Device Power-On-Reset (POR)
- 9.2.2 Device Power Up from Battery without Input Source
- 9.2.3 Device Power Up from Input Source
- 9.2.4 Input Current Optimizer (ICO)
- 9.2.5 Boost Mode Operation from Battery
- 9.2.6 Power Path Management
- 9.2.7 Battery Charging Management
- 9.2.8 Battery Monitor
- 9.2.9 Status Outputs ( PG, STAT, and INT)
- 9.2.10 BATET (Q4) Control
- 9.2.11 Current Pulse Control Protocol
- 9.2.12 Input Current Limit on ILIM
- 9.2.13 Thermal Regulation and Thermal Shutdown
- 9.2.14 Voltage and Current Monitoring in Buck and Boost Mode
- 9.2.15 Battery Protection
- 9.2.16 Serial Interface
- 9.3 Device Functional Modes
- 9.4 Register Maps
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.2.3 System Output Capacitor
Output capacitor also should have enough ripple current rating to absorb output switching ripple current. The output capacitor RMS current ICOUT is given:
Equation 8. 
The output capacitor voltage ripple can be calculated as follows:
Equation 9. 
At certain input/output voltage and switching frequency, the voltage ripple can be reduced by increasing the output filter LC. The charger device has internal loop compensator. To get good loop stability, 1-μH and minimum of 20-μF output capacitor is recommended. The preferred ceramic capacitor is 6V or higher rating, X7R or X5R.