BQ24751A Series
Host controlled 2-4 cell Buck battery charge controller with system power selector with low Iq
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Host controlled 2-4 cell Buck battery charge controller with system power selector with low Iq
| Part | Mounting Type | Operating Temperature [Max] | Operating Temperature [Min] | Current - Charging | Charge Current - Max [Max] | Package / Case | Voltage - Supply (Max) [Max] | Battery Chemistry | Fault Protection | Supplier Device Package | Battery Pack Voltage | Number of Cells [Max] [custom] | Number of Cells [Min] [custom] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ24751ARHDT | Surface Mount | 125 ¯C | -40 °C | Constant - Programmable | 10 A | 28-VFQFN Exposed Pad | 24 V | Multi-Chemistry | Over Current, Over Voltage | 28-VQFN (5x5) | 18.04 V | 4 | 2 |
Texas Instruments BQ24751ARHDR | Surface Mount | 125 ¯C | -40 °C | Constant - Programmable | 10 A | 28-VFQFN Exposed Pad | 24 V | Multi-Chemistry | Over Current, Over Voltage | 28-VQFN (5x5) | 18.04 V | 4 | 2 |
Key Features
• NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty CycleHigh-Accuracy Voltage and Current Regulation±0.5% Charge Voltage Accuracy±3% Charge Current Accuracy±3% Adapter Current Accuracy±2% Input Current Sense Amp AccuracyIntegrationAutomatic System Power Selection From AC/DC Adapter or BatteryInternal Loop CompensationInternal Soft StartSafetyProgrammable Input Overvoltage Protection (OVP)Dynamic Power Management (DPM) with Status IndicatorProgrammable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) LimitsReverse-Conduction Protection Input FETSupports Two, Three, or Four Li+ Cells5 - 24 V AC/DC-Adapter Operating RangeAnalog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host ControlCharge Voltage (4-4.512 V/cell)Charge Current (up to 10 A, with 10-msense resistor)Adapter Current Limit (DPM)Status and Monitoring OutputsAC/DC Adapter Present with Programmable Voltage ThresholdCurrent Drawn from Input SourceBattery Learn Cycle ControlSupports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.Charge Enable28-pin, 5x5-mm QFN packageEnergy Star Low Iq< 10-µA Off-State Battery Discharge Current< 1.5-mA Off-State Input Quiescent CurrentAPPLICATIONSNotebook and Ultra-Mobile ComputersPortable Data Capture TerminalsPortable PrintersMedical Diagnostics EquipmentBattery Bay ChargersBattery Back-up SystemsNMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty CycleHigh-Accuracy Voltage and Current Regulation±0.5% Charge Voltage Accuracy±3% Charge Current Accuracy±3% Adapter Current Accuracy±2% Input Current Sense Amp AccuracyIntegrationAutomatic System Power Selection From AC/DC Adapter or BatteryInternal Loop CompensationInternal Soft StartSafetyProgrammable Input Overvoltage Protection (OVP)Dynamic Power Management (DPM) with Status IndicatorProgrammable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) LimitsReverse-Conduction Protection Input FETSupports Two, Three, or Four Li+ Cells5 - 24 V AC/DC-Adapter Operating RangeAnalog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host ControlCharge Voltage (4-4.512 V/cell)Charge Current (up to 10 A, with 10-msense resistor)Adapter Current Limit (DPM)Status and Monitoring OutputsAC/DC Adapter Present with Programmable Voltage ThresholdCurrent Drawn from Input SourceBattery Learn Cycle ControlSupports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.Charge Enable28-pin, 5x5-mm QFN packageEnergy Star Low Iq< 10-µA Off-State Battery Discharge Current< 1.5-mA Off-State Input Quiescent CurrentAPPLICATIONSNotebook and Ultra-Mobile ComputersPortable Data Capture TerminalsPortable PrintersMedical Diagnostics EquipmentBattery Bay ChargersBattery Back-up Systems
Description
AI
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.
The bq24751A controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current. This AC Over-Power protection (ACOP) feature limits the input-switch power to the programmed level on the ACOP pin, and latches off if the high-power condition persists to prevent overheating.
The bq24751A features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.
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.
The bq24751A controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current. This AC Over-Power protection (ACOP) feature limits the input-switch power to the programmed level on the ACOP pin, and latches off if the high-power condition persists to prevent overheating.
The bq24751A features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.