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BQ24745 +BOM

SMBus up to 4 cell level 2 Buck battery chager to support Multiple battery chemistries

Hersteller:

Texas Instruments
Herstellerteil #:

BQ24745
Datenblatt:

BQ24745 Datenblatt (PDF)
Paket/Koffer:

QFN-28
Produktart:

Power Management Circuits
RoHS:
EDA/CAD Modelle:

Fordern Sie kostenlose CAD-Modelle für an BQ24745

BQ24745 Allgemeine Beschreibung

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.

Hauptmerkmale

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
- Input Current Comparator, With Adjustable
  Threshold and Hysteresis
- Internal Soft-Start
Safety
- 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)
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
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

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Servicerichtlinien und andere

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Verpackung

AVAQ bestimmt und verpackt alle Geräte auf der Grundlage der Schutzanforderungen gegen elektrostatische Entladung (ESD) und Feuchtigkeitsempfindlichkeit (MSL)..