RT9458中文资料Switch-Mode Single Cell Li-Ion Battery Charger with USB-OTG数据手册Richtek规格书

描述 Description

The RT9458 is a switch-mode single cell Li-Ion/Li-Polymer battery charger for portable applications. It integrates a synchronous PWM controller, power MOSFETs, input current sensing, high accuracy voltage regulation and charge termination circuits. The RT9458 also features USB On-The-Go (OTG). The RT9458 optimizes the charging task by using a control algorithm to vary the charge rate via different modes, including pre-charge mode, fast charge mode, and constant voltage mode. The key charge parameters can be programmed via the I2C interface. The RT9458 resumes the charge cycle whenever the battery voltage falls below an internal threshold and automatically enters sleep mode when the input power supply is removed.Other features include under-voltage protection, over-voltage protection, thermal regulation and reverse leakage protection.The RT9458 is available in the small WL-CSP-20B 2.1x1.87 (BSC) package.The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.

特性 Features

Support Quick Start for Charger
High Accuracy Voltage/Current Regulation
Input Current Regulation : 100mA/500mA/700mA/1A
Minimum Input Voltage Regulation : 4.1V to 4.7V Per 0.1V Step
Charge Voltage Regulation Accuracy : ±1%
Charge Current Regulation Accuracy : ±5%
Built-In Input Current Sensing and Limiting
Integrated Power MOSFETS for up to 1.55A Charge Rate
Integrated Sensing Resistors for Charging Current Sensing
Synchronous 1.5MHz Fixed Frequency PWM Controller with up to 95% Duty Cycle
Reverse Leakage Protection to Prevent Battery Drainage
Thermal Regulation and Protection
Over-Temperature Protection
Input Over-Voltage Protection
IRQ Output for Communication with I2C
Automatic Charging
RoHS Compliant and Halogen Free

应用 Application

• Cellular Telephones
• MP3 Players
• Portable Instruments