ZHCSBL6D september 2013 – april 2023 BQ24296 , BQ24297
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Description (continued)
- 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 Device Power Up
- 9.3.2 Power Path Management
- 9.3.3 Battery Charging Management
- 9.3.4 Status Outputs ( PG, STAT, and INT)
- 9.3.5 Protections
- 9.4 Device Functional Modes
- 9.5 Programming
- 9.6
Register Map
- 9.6.1
I2C Registers
- 9.6.1.1 Input Source Control Register REG00 [reset = 00110xxx, or 3x]
- 9.6.1.2 Power-On Configuration Register REG01 [reset = 00011011, or 0x1B]
- 9.6.1.3 Charge Current Control Register REG02 [reset = 01100000, or 60]
- 9.6.1.4 Pre-Charge/Termination Current Control Register REG03 [reset = 00010001, or 0x11]
- 9.6.1.5 Charge Voltage Control Register REG04 [reset = 10110010, or 0xB2]
- 9.6.1.6 Charge Termination/Timer Control Register REG05 [reset = 10011010, or 0x9A]
- 9.6.1.7 Boost Voltage/Thermal Regulation Control Register REG06 [reset = 01110011, or 0x73]
- 9.6.1.8 Misc Operation Control Register REG07 [reset = 01001011, or 4B]
- 9.6.1.9 System Status Register REG08
- 9.6.1.10 New Fault Register REG09
- 9.6.1.11 Vender / Part / Revision Status Register REG0A
- 9.6.1
I2C Registers
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.2.2 Input Capacitor
Input capacitor should have 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 by the following equation:
For best performance, VBUS should be decouple to PGND with 1-μF capacitance. The remaining input capacitor should be place on PMID.
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. 25-V rating or higher capacitor is preferred for 15-V input voltage. 22-μF capacitance is suggested for typical of 3-A to 4-A charging current.