Part Name
RT9451
Other PDF
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page
37 Pages
File Size
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MFG CO.
Richtek Technology
RT9451(2013) Datasheet - Richtek Technology
Richtek Technology
General Description
The RT9451 integrates a high efficiency USB friendly switch mode charger with On-The-Go (OTG) support for single cell Li-ion and Li-polymer batteries, D+D− detection, and a 50mA LDO regulator into a single chip.
Features
• Integrated Switching Charger and 50mA LDO in a
Single Package
• Charges Faster Than Linear Chargers
• High Accuracy Voltage and Current Regulation
► Charge Voltage Regulation Accuracy : ±1%
► Charge Current Regulation Accuracy : ±5%
• Minimum Input Voltage Regulation : 4.2V to 4.76V
with Step of 80mV
• Bad Adaptor Detection and Rejection
• Safety Limit Register for Maximum Charge Voltage
and Current Limiting
• High Efficiency Mini-USB/AC Battery Charger for
Single Cell Li-Ion and Li-Polymer Battery Packs
• 28V Absolute Maximum Input Voltage Rating
• 12V Maximum Operating Input Voltage
• Built-In Input Current Sensing and Limiting
• Integrated Power FETs for Up to 4A Charge Rate
• Programmable Charge Parameters through I2C
Interface (up to 400 Kbps) :
► Input Current
► Fast Charge/Termination Current
► Charge Voltage (3.5V to 4.44V)
► Safety Timer
► Termination Enable
• Synchronous Fixed Frequency PWM Controller
Operating at 375kHz With 0% to 99% Duty Cycle
• Automatic High Impedance Mode for Low Power
Consumption
• Safety Timer with Reset Control
• Thermal Regulation and Protection
• Input/Output Over-Voltage Protections
• Status Output for Charging and Faults
• USB Friendly Boot-Up Sequence
• Automatic Charging
• Boost Mode Operation for USB OTG
► Input Voltage Range (BATS) : 2.5V to 4.5V
► Output Voltage for VIN : 4.425V to 5.506V
• RoHS Compliant and Halogen Free
Applications
• Mobile Phones and Smart Phones
• MP3 Players
• Handheld Devices
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