BQ2057WTSTR

Battery Type : Li-Ion, Li-Poly
Packaging : Reel
Minimum Operating Temperature : - 20 C
Output Current : 40 mA
Maximum Operating Temperature : + 70 C
Package / Case : TSSOP-8
Operating Supply Voltage : 4.5 V to 15 V
Output Voltage : 8.4 V


Description

The BQ2057WTSTR advanced Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Pol) linear charge-management ICs are designed for costsensitive and compact portable electronics. They combine high-accuracy current and voltage regulation,battery conditioning, temperature monitoring, charge termination, charge-status indication, and AutoComp charge-rate compensation in a single 8-pin IC. MSOP,TSSOP, and SOIC package options are offered to fit a wide range of end applications.

The BQ2057WTSTR continuously measures battery temperature using an external thermistor. For safety,the BQ2057WTSTR inhibits charge until the battery temperature is within user-defined thresholds. The BQ2057WTSTR then charges the battery in three phases: conditioning,constant current, and constant voltage. If the battery voltage is below the low-voltage threshold, V(min), the BQ2057WTSTR precharges using a low current to condition the battery. The conditioning charge rate is approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external passelement during the initial stage of the charge. After conditioning, the BQ2057WTSTR applies a constant current to the battery. An external sense-resistor sets the current.The sense-resistor can be on either the high or low side of the battery without additional components. The constant-current phase continues until the battery reaches the charge-regulation voltage.

The BQ2057WTSTR then begins the constant-voltage phase. The accuracy of the voltage regulation is better than ±1% over the operating-temperature and supply-voltage ranges. For single and dual cells, the bq2057 is offered in four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V, and 8.4 V. Charge stops when the current tapers to the charge termination threshold, I(TERM). The BQ2057WTSTR automatically restarts the charge if the battery voltage falls below the V(RCH) threshold.The designer also may use the AutoComp feature to reduce charging time. This proprietary technique allows safe and dynamic compensation for the internal impedance of the battery pack during charge.

Parameters:

Technical/Catalog Information	BQ2057WTSTR
Vendor	Texas Instruments
Category	Integrated Circuits (ICs)
Battery Type	Li-Ion, Li-Pol
Function	Charge Management
Package / Case	8-TSSOP
Packaging	Tape & Reel (TR)
Operating Temperature	-20°C ~ 70°C
Voltage - Supply	4.5 V ~ 15 V
Drawing Number	296; 4040064; PW; 8, 14, 16, 20, 24, 28
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	BQ2057WTSTR BQ2057WTSTR