ZHCSKP6A January 2020 – February 2022 BQ25616
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 说明（续）
- 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 Power-On-Reset (POR)
- 9.3.2 Device Power Up From Battery Without Input Source
- 9.3.3 Power Up From Input Source
- 9.3.4 Boost Mode Operation From Battery
- 9.3.5 Standalone Charger
- 9.3.6 Power Path Management
- 9.3.7 Battery Charging Management
- 9.3.8 Status Outputs ( PG, STAT)
- 9.3.9 Protections
- 9.4 Device Functional Modes
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.1.2.2 Input Capacitor and Resistor
Design input capacitance to provide enough ripple current rating to absorb input switching ripple current. The worst case RMS ripple current is half of the charging current when duty cycle is 0.5. If the converter does not operate at 50% duty cycle, then the worst case capacitor RMS current ICIN occurs where the duty cycle is closest to 50% and can be estimated using Equation 8.
Low ESR ceramic capacitor such as X7R or X5R is preferred for input decoupling capacitor and should be placed to the drain of the high-side MOSFET and source of the low-side MOSFET as close as possible. Voltage rating of the capacitor must be higher than normal input voltage level. A rating of 25-V or higher capacitor is preferred for 12-V input voltage. Capacitance of minimum 10 μF is suggested for typical of 3-A charging current.
During high current output over 700 mA in boost mode, a 10 kΩ pull-down resistor on VBUS is recommended to keep VBUS low in case Q1 RBFET leakage gets high.