SLUSFH4A March 2025 – July 2025 BQ25858-Q1 , BQ25858B-Q1
PRODUCTION DATA
請參考 PDF 數據表獲取器件具體的封裝圖。
The battery current sense resistor between SRP and SRN is fixed at 5mΩ; using a different value is not recommended. The input current sense resistor between ACP and ACN is typically 5mΩ, but can vary from 2mΩ to 10mΩ. In USB-PD EPR applications, a 5mΩ sense resistor is recommended to achieve programmability in 50mA/step. In addition, if input current limit function is not desired, ACP and ACN may be shorted together. For both of these sense resistors, a filter network is recommended as shown in the Typical Application.
For both the input current and the output current, the limits may be programmed using the I2C interface or an external programming resistor on IIN and IOUT pins, respectively.
| PARAMETER | FORMULA | VALUE |
|---|---|---|
| Input Current Hardware Limit | Unused | Pull IIN pin to GND |
| Input Current Software Limit | Unused | REG06 = 0x0640 |
| Output Current Hardware Limit | RIOUT = KICHG / 8A | 6.25kΩ for 8A with 5mΩ RBAT_SNS |
| Output Current Software Limit | ICHG = 5A | REG02 = 0x0190 (5A) |
The default input sense resistor (RAC_SNS) is 5mΩ, and the register allows for a range of up-to 20A input current limit.