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)
7.3.4.2 Lead Acid Battery Charging Profile
The device charges the battery in three phases: constant current, absorb voltage, and float voltage charging. At the beginning of a charging cycle, the device checks the battery voltage and regulates current/voltage accordingly. The table below summarizes the register bit recommendations to configure the device as a Lead-Acid battery charger.
| PARAMETER | I2C REGISTER BITS | VALUE | EQUIVALENT PER 13.2V FLOAT V |
|---|---|---|---|
| Three-Stage Charging Control | EN_3_STAGE_CHARGE | 1 | N/A |
| Absorb Voltage | VBAT_ABSORB | 0x3 = 140mV + VFB_REG | 14.4V |
| Absorb Timer | CV_TMR | 0x5 = 5hr | N/A |
| Temperature Compensated Charging | EN_VREG_TEMP_COMP | 1 | -18mV/oC |
If the charger device is in DPM regulation during charging, the actual charging current will be less than the programmed value. In this case, Absorb to Float transition through termination comparator is temporarily disabled. The device will remain in Absorb phase until either the battery current drops below the ITERM threshold or the CV timer expires. After the Absorb phase, the charge voltage drops to VFB_REG, where it remains indefinitely.
Figure 7-3 Typical Pb-Acid
Battery Charging Profile