ZHCSJ56C February 2018 – September 2019 BQ25882
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 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 Device Power-On-Reset
- 8.3.2 Device Power Up from Battery without Input Source
- 8.3.3 Device Power Up from Input Source
- 8.3.4 Input Current Optimizer (ICO)
- 8.3.5 Buck Mode Operation from Battery (OTG)
- 8.3.6 Power Path Management
- 8.3.7 Battery Charging Management
- 8.3.8 Integrated 16-Bit ADC for Monitoring
- 8.3.9 Status Outputs (PG, and INT)
- 8.3.10 Input Current Limit on ILIM Pin
- 8.3.11 Voltage and Current Monitoring
- 8.3.12 Thermal Regulation and Thermal Shutdown
- 8.3.13 Battery Protection
- 8.3.14 Serial Interface
- 8.4 Device Functional Modes
- 8.5
Register Maps
- 8.5.1 Battery Voltage Regulation Limit Register (Address = 00h) [reset = A0h]
- 8.5.2 Charger Current Limit Register (Address = 01h) [reset = 54h]
- 8.5.3 Input Voltage Limit Register (Address = 02h) [reset = 85h]
- 8.5.4 Input Current Limit Register (Address = 03h) [reset = 39h]
- 8.5.5 Precharge and Termination Current Limit Register (Address = 04h) [reset = 22h]
- 8.5.6 Charger Control 1 Register (Address = 05h) [reset = 9Dh]
- 8.5.7 Charger Control 2 Register (Address = 06h) [reset = 7Dh]
- 8.5.8 Charger Control 3 Register (Address = 07h) [reset = 0Ah]
- 8.5.9 Charger Control 4 Register (Address = 08h) [reset = 0Dh]
- 8.5.10 OTG Control Register (Address = 09h) [reset = F6h]
- 8.5.11 ICO Current Limit Register (Address = 0Ah) [reset = XXh]
- 8.5.12 Charger Status 1 Register (Address = 0Bh) [reset = XXh]
- 8.5.13 Charger Status 2 Register (Address = 0Ch) [reset = XXh]
- 8.5.14 NTC Status Register (Address = 0Dh) [reset = 0Xh]
- 8.5.15 FAULT Status Register (Address = 0Eh) [reset = XXh]
- 8.5.16 Charger Flag 1 Register (Address = 0Fh) [reset = 00h]
- 8.5.17 Charger Flag 2 Register (Address = 10h) [reset = 00h]
- 8.5.18 FAULT Flag Register (Address = 11h) [reset = 00h]
- 8.5.19 Charger Mask 1 Register (Address = 12h) [reset = 00h]
- 8.5.20 Charger Mask 2 Register (Address = 13h) [reset = 00h]
- 8.5.21 FAULT Mask Register (Address = 14h) [reset = 00h]
- 8.5.22 ADC Control Register (Address = 15h) [reset = 30h]
- 8.5.23 ADC Function Disable Register (Address = 16h) [reset = 00h]
- 8.5.24 IBUS ADC 1 Register (Address = 17h) [reset = 00h]
- 8.5.25 IBUS ADC 0 Register (Address = 18h) [reset = 00h]
- 8.5.26 ICHG ADC 1 Register (Address = 19h) [reset = 00h]
- 8.5.27 ICHG ADC 0 Register (Address = 1Ah) [reset = 00h]
- 8.5.28 VBUS ADC 1 Register (Address = 1Bh) [reset = 00h]
- 8.5.29 VBUS ADC 0 Register (Address = 1Ch) [reset = 00h]
- 8.5.30 VBAT ADC 1 Register (Address = 1Dh) [reset = 00h]
- 8.5.31 VBAT ADC 0 Register (Address = 1Eh) [reset = 00h]
- 8.5.32 VSYS ADC 1 Register (Address = 1Fh) [reset = 00h]
- 8.5.33 VSYS ADC 0 Register (Address = 20h) [reset = 00h]
- 8.5.34 TS ADC 1 Register (Address = 21h) [reset = 00h]
- 8.5.35 TS ADC 0 Register (Address = 22h) [reset = 00h]
- 8.5.36 TDIE ADC 1 Register (Address = 23h) [reset = 00h]
- 8.5.37 TDIE ADC 0 Register (Address = 24h) [reset = 00h]
- 8.5.38 Part Information Register (Address = 25h) [reset = 11h]
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
9.2.2.3 Output (VSYS) Capacitor
SYS capacitor is the boost converter output capacitor and should also have enough ripple current rating to absorb output switching ripple current. The output capacitor RMS current ICSYS is given:
Equation 8. 
The output capacitor voltage ripple is a function of the boost output current (IOUT), and can be calculated as follows:
Equation 9. 
Low ESR ceramic capacitor such as X7R or X5R is preferred for SYS decoupling capacitor and should be placed close to the SYS and GND pins of the IC. Voltage rating of the capacitor must be higher than normal output voltage level. 16-V rating or higher capacitor is preferred. 40-μF capacitor is suggested for up to 2.2-A boost converter output current.