- BQ24745RHDR
- 参考价格:
- 发布者:凌晔科技
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详细信息
品牌:TI德州
封装:QFN
批号:18+
数量*:280000
描述:The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.
The bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.
产品特性
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
±0.5% Charge Voltage Accuracy
±3% Charge Current Accuracy
±3% Adapter Current Accuracy
±2% Input Current Sense Amp Accuracy
Integration
Input Current Comparator, With Adjustable
Threshold and Hysteresis
Internal Soft-Start
Input Current Comparator, With Adjustable
Threshold and Hysteresis
Internal Soft-Start
Safety
Dynamic Power Management (DPM)
Dynamic Power Management (DPM)
Up to 19.2-V Battery Voltage
7-V–24-V AC/DC-Adapter Operating Range
Simplified SMBus Control Interface
Charge Voltage DAC (1.024 V–19.2 V)
Charge Current DAC (128 mA–8.064 A)
Adapter Current Limit DPM DAC
(256 mA–11.008 A)
Charge Voltage DAC (1.024 V–19.2 V)
Charge Current DAC (128 mA–8.064 A)
Adapter Current Limit DPM DAC
(256 mA–11.008 A)
Status and Monitoring Outputs
AC/DC Adapter Present With
Adjustable Voltage Threshold
Input Current Comparator With Adjustable
Threshold and Hysteresis
Current Sense Amplifier for Current Drawn
From Input Source
AC/DC Adapter Present With
Adjustable Voltage Threshold
Input Current Comparator With Adjustable
Threshold and Hysteresis
Current Sense Amplifier for Current Drawn
From Input Source
Charge Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, Etc.
Charge Enable Pin
< 10-μA Battery Current With Adapter Removed
< 1-mA Input DCIN Current With Adapter
Present and Charge Disabled
28-Pin, 5-mm × 5-mm QFN Package
深圳市凌晔科技有限公司
广东省深圳市福田区华强广场C座13L
TEL:13544017528
qq: 869030400
E-mail:869030400@qq.com
封装:QFN
批号:18+
数量*:280000
描述:The bq24745 is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm × 5 mm QFN package.
The bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit.
产品特性
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
±0.5% Charge Voltage Accuracy
±3% Charge Current Accuracy
±3% Adapter Current Accuracy
±2% Input Current Sense Amp Accuracy
Integration
Input Current Comparator, With Adjustable
Threshold and Hysteresis
Internal Soft-Start
Input Current Comparator, With Adjustable
Threshold and Hysteresis
Internal Soft-Start
Safety
Dynamic Power Management (DPM)
Dynamic Power Management (DPM)
Up to 19.2-V Battery Voltage
7-V–24-V AC/DC-Adapter Operating Range
Simplified SMBus Control Interface
Charge Voltage DAC (1.024 V–19.2 V)
Charge Current DAC (128 mA–8.064 A)
Adapter Current Limit DPM DAC
(256 mA–11.008 A)
Charge Voltage DAC (1.024 V–19.2 V)
Charge Current DAC (128 mA–8.064 A)
Adapter Current Limit DPM DAC
(256 mA–11.008 A)
Status and Monitoring Outputs
AC/DC Adapter Present With
Adjustable Voltage Threshold
Input Current Comparator With Adjustable
Threshold and Hysteresis
Current Sense Amplifier for Current Drawn
From Input Source
AC/DC Adapter Present With
Adjustable Voltage Threshold
Input Current Comparator With Adjustable
Threshold and Hysteresis
Current Sense Amplifier for Current Drawn
From Input Source
Charge Any Battery Chemistry: Li+, NiCd,
NiMH, Lead Acid, Etc.
Charge Enable Pin
< 10-μA Battery Current With Adapter Removed
< 1-mA Input DCIN Current With Adapter
Present and Charge Disabled
28-Pin, 5-mm × 5-mm QFN Package
深圳市凌晔科技有限公司
广东省深圳市福田区华强广场C座13L
TEL:13544017528
qq: 869030400
E-mail:869030400@qq.com
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