SLUSE53 December 2024 BQ25751
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 Battery Charging Management
- 7.3.5 Power Path Management
- 7.3.6 Reverse Mode Power Direction
- 7.3.7 Integrated 16-Bit ADC for Monitoring
- 7.3.8 Status Outputs (PG, STAT1, STAT2, and INT)
- 7.3.9 Serial Interface
- 7.4 Device Functional Modes
- 7.5 BQ25751 Registers
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
Typical Application (Standalone)
- 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 Charge Voltage Selection
- 8.2.1.2.3 Switching Frequency Selection
- 8.2.1.2.4 Inductor Selection
- 8.2.1.2.5 Input (VAC / SYS) Capacitor
- 8.2.1.2.6 Output (VBAT) Capacitor
- 8.2.1.2.7 Sense Resistor (RAC_SNS and RBAT_SNS) and Current Programming
- 8.2.1.2.8 ACFETs and BATFETs Selection
- 8.2.1.2.9 Converter Fast Transient Response
- 8.2.1.3 Application Curves
- 8.2.1
Typical Application (Standalone)
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Revision History
- 13Mechanical, Packaging, and Orderable Information
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)
7.3.6.1 Auto Reverse Mode
In some applications, a regulated system voltage is required when the adapter power is removed. The device integrates an auto-reverse function which provides a regulated system voltage using the buck-boost converter in reverse direction once the input power is removed.
When enabled by setting the AUTO_REV register bit to 1, Auto Reverse mode can be used to provide a regulated system voltage immediately after the input power is removed. The device transitions to reverse mode with the BATFET off and the converter on when the input falls below the ACUV threshold.
Figure 7-5 Auto Reverse Mode if BAT >
VSYS_REV When VAC is RemovedThe Auto Reverse mode operation will be automatically enabled if the following conditions are valid:
- SRN voltage above VSRN_OK
- VAC outside the ACOV / ACUV operating window, or VAC < VVAC_OK, or VAC > VVAC_INT_OV
- Auto Reverse mode operation is enabled (EN_AUTO_REV = 1)
- Voltage at TS (thermistor) pin is within range configured by Reverse Temperature Monitor as configured by BHOT and BCOLD register bits
While the Auto reverse mode is active, the device sets the REVERSE_STAT bit to 1. Host can disable the Auto reverse operation at any time by setting EN_AUTO_REV = 0 and EN_REV = 0. The device then disables the converter, and turns the BATFET on to connect the battery directly to the system.