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BQ24751A

  

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TI
Texas Instruments
BQ24751A Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC Over-Power Protection, Programmable OVP and Low Iq

DESCRIPTION
The bq24751A is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.
The bq24751A charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package.

FEATURES
• NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
• 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
• High-Accuracy Voltage and Current Regulation
   – ±0.5% Charge Voltage Accuracy
   – ±3% Charge Current Accuracy
   – ±3% Adapter Current Accuracy
   – ±2% Input Current Sense Amp Accuracy
• Integration
   – Automatic System Power Selection From AC/DC Adapter or Battery
   – Internal Loop Compensation
   – Internal Soft Start
• Safety
   – Programmable Input Overvoltage Protection (OVP)
   – Dynamic Power Management (DPM) with Status Indicator
   – Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
   – Reverse-Conduction Protection Input FET
• Supports Two, Three, or Four Li+ Cells
• 5 – 24 V AC/DC-Adapter Operating Range
• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
   – Charge Voltage (4-4.512 V/cell)
   – Charge Current (up to 10 A, with 10-mΩ sense resistor)
   – Adapter Current Limit (DPM)
• Status and Monitoring Outputs
   – AC/DC Adapter Present with Programmable Voltage Threshold
   – Current Drawn from Input Source
• Battery Learn Cycle Control
• Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
• Charge Enable
• 28-pin, 5x5-mm QFN package
• Energy Star Low Iq
   – < 10-µA Off-State Battery Discharge Current
   – < 1.5-mA Off-State Input Quiescent Current

APPLICATIONS
• Notebook and Ultra-Mobile Computers
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems


other parts : BQ24751ARHDR  BQ24751ARHDT  
BQ24751A PDF
TI
Texas Instruments
BQ24751ARHDT Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC Over-Power Protection, Programmable OVP and Low Iq

DESCRIPTION
The bq24751A is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.
The bq24751A charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package.

FEATURES
• NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
• 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
• High-Accuracy Voltage and Current Regulation
   – ±0.5% Charge Voltage Accuracy
   – ±3% Charge Current Accuracy
   – ±3% Adapter Current Accuracy
   – ±2% Input Current Sense Amp Accuracy
• Integration
   – Automatic System Power Selection From AC/DC Adapter or Battery
   – Internal Loop Compensation
   – Internal Soft Start
• Safety
   – Programmable Input Overvoltage Protection (OVP)
   – Dynamic Power Management (DPM) with Status Indicator
   – Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
   – Reverse-Conduction Protection Input FET
• Supports Two, Three, or Four Li+ Cells
• 5 – 24 V AC/DC-Adapter Operating Range
• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
   – Charge Voltage (4-4.512 V/cell)
   – Charge Current (up to 10 A, with 10-mΩ sense resistor)
   – Adapter Current Limit (DPM)
• Status and Monitoring Outputs
   – AC/DC Adapter Present with Programmable Voltage Threshold
   – Current Drawn from Input Source
• Battery Learn Cycle Control
• Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
• Charge Enable
• 28-pin, 5x5-mm QFN package
• Energy Star Low Iq
   – < 10-µA Off-State Battery Discharge Current
   – < 1.5-mA Off-State Input Quiescent Current

APPLICATIONS
• Notebook and Ultra-Mobile Computers
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems


other parts : BQ24751A  BQ24751ARHDR  
BQ24751ARHDT PDF
TI
Texas Instruments
BQ24751ARHDR Host-controlled Multi-Chemistry Battery Charger With System Power Selector, AC Over-Power Protection, Programmable OVP and Low Iq

DESCRIPTION
The bq24751A is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.
The bq24751A charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package.

FEATURES
• NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
• 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
• High-Accuracy Voltage and Current Regulation
   – ±0.5% Charge Voltage Accuracy
   – ±3% Charge Current Accuracy
   – ±3% Adapter Current Accuracy
   – ±2% Input Current Sense Amp Accuracy
• Integration
   – Automatic System Power Selection From AC/DC Adapter or Battery
   – Internal Loop Compensation
   – Internal Soft Start
• Safety
   – Programmable Input Overvoltage Protection (OVP)
   – Dynamic Power Management (DPM) with Status Indicator
   – Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
   – Reverse-Conduction Protection Input FET
• Supports Two, Three, or Four Li+ Cells
• 5 – 24 V AC/DC-Adapter Operating Range
• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
   – Charge Voltage (4-4.512 V/cell)
   – Charge Current (up to 10 A, with 10-mΩ sense resistor)
   – Adapter Current Limit (DPM)
• Status and Monitoring Outputs
   – AC/DC Adapter Present with Programmable Voltage Threshold
   – Current Drawn from Input Source
• Battery Learn Cycle Control
• Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
• Charge Enable
• 28-pin, 5x5-mm QFN package
• Energy Star Low Iq
   – < 10-µA Off-State Battery Discharge Current
   – < 1.5-mA Off-State Input Quiescent Current

APPLICATIONS
• Notebook and Ultra-Mobile Computers
• Portable Data Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems


other parts : BQ24751A  BQ24751ARHDT  
BQ24751ARHDR PDF
TI
Texas Instruments
BQ24751ARHDRG4 Multi-Cell Synch Sw- mode Charger BQ24751ARHDRG4 PDF

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