Details, datasheet, quote on part number: BQ2056SN
PartBQ2056SN
CategoryPower Management => Battery Management => Battery Chargers
Descriptionti BQ2056, Li-ion Low-dropout Linear Charge Management ic With Autocomptm
CompanyTexas Instruments, Inc.
DatasheetDownload BQ2056SN datasheet
Cross ref.Similar parts: BQ2000, BQ2000T, BQ2002, BQ2002C, BQ2002D, BQ2002E, BQ2002F, BQ2002T, BQ24400, BQ24401
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Features, Applications
Low-Dropout Li-Ion Charge-Control ICs with AutoCompTM Charge-Rate Compensation
Features

Significant reduction in charge time with AutoComp charge-rate compensation Ideal for low-dropout linear regulator design 1-cell, 2-cell, and programmable multicell versions Low-cost charger implementation with minimum number of external components Programmable current limit to accommodate any battery size Interface to external trickle charger for reviving deeply discharged batteries High-accuracy charge control Sleep mode for low power consumption Direct battery voltage sense ti (bq2056 and bq2056T) Small 8-pin SOIC package

The bq2056 series ICs are low-cost precision linear charge-control devices for Li-Ion batteries. With a minimum number of external components, the is a complete lowdropout linear charger. The dropout voltage is typically less than 0.5V when the bq2056 is used with an external PNP transistor or P-channel FET. Features include proprietary

automatic charge-rate compensation (AutoComp) and a trickle-charger interface output for reviving deeply discharged cells. The bq2056 supports a single-cell 4.1V pack and the 2056T supports a two-cell 8.2V pack. The bq2056V may be externally programmed for supporting other voltages. All versions feature a sleep mode for low-power applications.

INH Charge-inhibit input Trickle-charge interface output Ground Charge-rate compensation input VCC SNS BAT CC Current sense input Battery voltage input Charge control output Supply input

INH Charge-inhibit input When input to this pin is high, the bq2056 suspends the charge in progress and places the device in sleep mode. When input is low, the bq2056 resumes operation. TRKL Trickle-charge interface output This output is driven low if the battery voltage is less than an internal threshold level and INH is low. This open-drain output can enable an external trickle charger to revive a deeply discharged battery. VSS COMP Ground Charge-rate compensation input This input is used to set the charge-rate compensation level. The voltage regulation output may be programmed to vary as a function of the charge current delivered to the battery. This feature, called AutoComp, provides compensation for internal cell impedance and voltage drops in protection circuitry and therefore may be used to safely reduce charging time. Connecting this pin to VSS disables the AutoComp feature. VCC SNS Current sense input Battery current is sensed via the voltage developed on this pin by an external senseresistor, connected in series with the negative terminal of the battery pack. BAT Battery voltage input This is the battery voltage sense input. It is tied directly to the positive side of the battery pack on bq2056 and bq2056T versions. A simple resistive divider is required to generate this input for bq2056V. CC Charge-control output is an open-collector output that is used to control the charging current to the battery. VCC supply input

The bq2056 supports a precision current- and voltagelimited charging system for Li-Ion batteries. The no-load voltage regulation references (VREG) for the bq2056 and bq2056T are maintained at 4.1V and 8.2V, respectively. The bq2056V provides variable regulation to accommodate a wide range of charge voltages and may be used to meet tighter tolerance requirements through external trimming. The functional block diagram for the is on the first page of this data sheet, and Figure 1 illustrates a typical application.

is accomplished by comparing pin BAT voltage to the internal threshold VMIN. While pin BAT voltage is less than VMIN and pin INH is low, the open-drain output TRKL is driven low and the voltage/current regulator is disabled (CC=high-Z). In the bq2056V, low-voltage detection occurs when the voltage on pin BAT is less than or equal to VMIND. As shown in Figure 1, TRKL enables an external trickle-charge circuit to bring the battery voltage up to VMIN or VMIND.

The bq2056 provides current regulation while the pack voltage is below the voltage limit. Charge-current feedback, applied through pin SNS, maintains regulation around a threshold of VSNS. The following formula calculates the value of the sense-resistor connected in series with the negative terminal of the battery pack (Figure 3): RSNS= 0.1/ IMAX where IMAX is the maximum charging current. IMAX should not exceed 1A. An external PNP or power P-FET may be used as the series pass element with control provided through output pin CC.

The bq2056 completes the charge cycle in two phases. A constant current phase replenishes approximately 70% of battery capacity, while an accurate voltage regulation phase completes the charge. Figure 2 shows a typical charge algorithm for bq2056, including charge qualification, current regulation, and voltage regulation phases.

During charge qualification the bq2056 detects a low battery and reports this status on pin TRKL. Detection


 

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