SLUSFH4A March 2025 – July 2025 BQ25858-Q1 , BQ25858B-Q1
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Device Comparison
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Device Power-On-Reset
- 7.3.2 Device Power-Up From Battery Without Input Source
- 7.3.3 Device Power Up From Input Source
- 7.3.4 Power Management
- 7.3.5 Bidirectional Power Flow and Programmability
- 7.3.6 Switching Frequency Dithering Feature
- 7.3.7 Integrated 16-Bit ADC for Monitoring
- 7.3.8 Status Outputs (PG, STAT and INT)
- 7.3.9
Protections
- 7.3.9.1
Voltage and Current Monitoring
- 7.3.9.1.1 VAC Over-voltage Protection (VAC_OVP)
- 7.3.9.1.2 VAC Under-voltage Protection (VAC_UVP)
- 7.3.9.1.3 Reverse Mode Over-voltage Protection (REV_OVP)
- 7.3.9.1.4 Reverse Mode Under-voltage Protection (REV_UVP)
- 7.3.9.1.5 DRV_SUP Under-voltage and Over-voltage Protection (DRV_OKZ)
- 7.3.9.1.6 REGN Under-voltage Protection (REGN_OKZ)
- 7.3.9.2 Thermal Shutdown (TSHUT)
- 7.3.9.1
Voltage and Current Monitoring
- 7.3.10 Serial Interface
- 7.4 Device Functional Modes
- 7.5 BQ25858-Q1/858B-Q1 Registers
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Typical Application (Buck-Boost configuration)
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 ACUV / ACOV Input Voltage Operating Window Programming
- 8.2.1.2.2 Switching Frequency Selection
- 8.2.1.2.3 Inductor Selection
- 8.2.1.2.4 Input (VAC) Capacitor
- 8.2.1.2.5 Output (VBAT) Capacitor
- 8.2.1.2.6 Sense Resistor (RAC_SNS and RBAT_SNS) and Current Programming
- 8.2.1.2.7 Converter Fast Transient Response
- 8.2.1.3 Application Curves
- 8.2.2 Typical Application (Buck-only configuration)
- 8.2.1
Typical Application (Buck-Boost configuration)
- 8.3 Power Supply Recommendations
- 8.4 Layout
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
封裝選項
請參考 PDF 數據表獲取器件具體的封裝圖。
機械數據 (封裝 | 引腳)
- RRV|36
散熱焊盤機械數據 (封裝 | 引腳)
- RRV|36
訂購信息
7.3.5 Bidirectional Power Flow and Programmability
The device supports buck-boost bidirectional power flow with programmable parameters via the I2C.
In the forward direction, the power flows from INPUT to OUTPUT, and the device controls the output current, output voltage, as well as the input current and input voltage. The IOUT_REG register bits control the current across the sense resistor connected at SRP and SRN (ROUT_SNS). The VOUT_REG register bits control the voltage regulation setpoint at VO_SNS pin. The IAC_DPM register bits control the input current across the sense resistor connected at ACP and ACN (RAC_SNS). The VAC_DPM register bits control the input voltage at the VAC pin.
Figure 7-4 Programmability in Forward
ModeIn the reverse direction, power flows from OUTPUT to INPUT, and the device control the input current as well as the input voltage. Reverse direction power flow can be enabled by setting the EN_REV bit to 1. The IAC_REV register bits control the reverse input current across the sense resistor connected at ACP and ACN (RAC_SNS). The VAC_REV register bits control the reverse input voltage at the VAC pin.
Figure 7-5 Programmability in Reverse
ModeThe reverse mode operation can be stopped at any time by setting EN_REV bit to 0; this action disables the switching converter.
Note: When operating as buck-only configuration via the MODE pin, it is recommended to set EN_CHG = 0 before enabling reverse mode operation.