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Features

➤

Safe charge of Lithium Ion bat

tery packs

➤

Voltage-regulated current-

limited charging

➤

Fast charge terminated by se

lectable minimum current; safety

backup termination on maximum

time

➤

Charging continuously qualified

by temperature and voltage lim

its

➤

Pulse-width modulation control

ideal for high-efficiency switch-

mode power conversion

➤ Direct LED control outputs dis-

play charge status and fault con-

ditions

General Description

The bq2054 Lithium Ion Fast-

Charge IC is designed to optimize

charging of lithium ion (Li-Ion)

chemistry batteries. A flexible

pulse-width modulation regulator

allows the bq2054 to control voltage

and current during charging. The

regulator frequency is set by an ex

ternal capacitor for design flexibility.

The switch-mode design keeps

power dissipation to a minimum.

The bq2054 measures battery tem

perature using an external thermis

tor for charge qualification. Charging

begins when power is applied or on

battery insertion.

For safety, the bq2054 inhibits

charging until the battery voltage

and temperature are within con-

figured limits. If the battery voltage

is less than the low-voltage thresh

old, the bq2054 provides low-current

conditioning of the battery.

A constant current-charging phase re

plenishes up to 70% of the charge ca

pacity, and a voltage-regulated phase

returns the battery to full. The charge

cycle terminates when the charging

current falls below a user-selectable

current limit. For safety, charging ter

minates after maximum time and is

suspended if the temperature is out

side the preconfigured limits.

The bq2054 provides status indica

tions of all charger states and faults

for accurate determination of the

battery and charge system condi

tions.

Lithium Ion Fast-Charge IC

bq2054

TM Time-out programming

input

ICTL

Inrush current control

output

BAT Battery voltage input

VCOMP Voltage loop comp input

ICOMP Current loop comp input

TERM

Minimum current

termination select input

SNS Sense resistor input

TS Temperature sense input

PN205401.eps

16-Pin Narrow

DIP or SOIC

LED

/DSEL

LED

MOD

LCOM

LED

TPWM

ICTL

BAT

VCOMP

ICOMP

TERM

SNS

TPWM Regulator timebase input

LED

Charge status output 3

LCOM Common LED output

System ground

5.0V

10% power

MOD Modulation control output

LED

Charge status output 1

LED

/ Charge status output 2/

DSEL Display select input

Pin Connections

Pin Names

6/99 H

Summary of content (19 pages)

PAGE 1
bq2054 Lithium Ion Fast-Charge IC Features General Description ➤ Safe charge of Lithium Ion battery packs The bq2054 Lithium Ion FastCharge IC is designed to optimize charging of lithium ion (Li-Ion) chemistry batteries. A flexible pulse-width modulation regulator allows the bq2054 to control voltage and current during charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design keeps power dissipation to a minimum.
PAGE 2
bq2054 TS Pin Descriptions TM This input is used to monitor battery temperature. An external resistor divider network sets the lower and upper temperature thresholds. See Figure 6 and Equations 3 and 4. Time-out programming input This input sets the maximum charge time. The resistor and capacitor values are determined using Equation 5. Figure 7 shows the resistor/capacitor connection.
PAGE 3
bq2054 Thermal monitoring continues throughout the charge cycle, and the bq2054 enters the Charge Pending state when the temperature out of range. (There is one exception; if the bq2054 is in the Fault state—see below—the out-of-range temperature is not recognized until the bq2054 leaves the Fault state.) All timers are suspended (but not reset) while the bq2054 is in Charge Pending.
PAGE 4
bq2054 Chip On VCC 4.
PAGE 5
bq2054 Charge Status Display Configuring the Display Mode and IMIN Charge status is enunciated by the LED driver outputs LED1–LED3. Three display modes are available in the bq2054; the user selects a display mode by configuring pin DSEL. Table 1 shows the three display modes. DSEL/LED2 is a bi-directional pin with two functions; it is an LED driver pin as an output and a programming pin as an input. The selection of pull-up, pull-down, or no pull resistor programs the display mode on DSEL per Table 1.
PAGE 6
bq2054 Fast charge terminates when the charging current drops below a minimum current threshold programmed by the value of ITERM (see Table 2) and remains below that level for 120 ± 40ms. These parameters are typically specified by the battery manufacturer. The total resistance presented across the battery pack by RB1 + RB2 should be between 150kΩ and 1MΩ. The minimum value ensures that the divider network does not drain the battery excessively when the power source is disconnected.
PAGE 7
bq2054 VCC LED2/DSEL LED1 10K 1K 16 15 1K VCC VSS 6 LCOM LED3 13 12 11 1K 10 bq2054 VSS FG205402.eps Figure 3. Configured Display Mode/IMIN Threshold VCC BAT + RB1 BAT 13 12 3 VCC RB2 VSS SNS bq2054 7 BAT RSNS VSS FG205403.eps Figure 4.
PAGE 8
bq2054 Battery Insertion and Removal Temperature Monitoring VCELL is interpreted by the bq2054 to detect the presence or absence of a battery. The bq2054 determines that a battery is present when V CELL is between the High-Voltage Cutoff (V HCO = V REG + 0.25V) and the Low-Voltage Cutoff (VLCO = 0.8V). When VCELL is outside this range, the bq2054 determines that no battery is present and transitions to the Fault state.
PAGE 9
bq2054 A resistor-divider network can be implemented that presents the defined voltage levels to the TS pin at the desired temperatures (see Figure 6). VCC R The equations for determining RT1 and RT2 are: 1 Equation 3 0.6 * VCC (VCC − 0.250 ) = RT1 * (RT2 + R LTF ) 1+ (RT2 * R LTF ) TM C VCC VSS Equation 4 0.44 = 1+ 1 RT1 * (RT2 + R HTF ) (RT2 * R HTF ) 13 12 bq2054 where: VSS n RLTF = thermistor resistance at LTF n RHTF = thermistor resistance at HTF FG205406.eps Figure 7.
PAGE 10
bq2054 Absolute Maximum Ratings Symbol Parameter Minimum Maximum Unit VCC VCC relative to VSS -0.3 +7.0 V VT DC voltage applied on any pin excluding VCC relative to VSS -0.3 +7.0 V TOPR Operating ambient temperature -20 +70 °C TSTG Storage temperature -55 +125 °C TSOLDER Soldering temperature - +260 °C Note: Notes Commercial 10 sec. max. Permanent device damage may occur if Absolute Maximum Ratings are exceeded.
PAGE 11
bq2054 DC Thresholds Symbol (TA = TOPR; VCC = 5V ± 10%) Parameter Rating Unit Tolerance Notes Internal reference voltage 2.05 V 1% Temperature coefficient -0.5 mV/°C 10% VLTF TS maximum threshold 0.6 * VCC V ± 0.03V Low-temperature fault VHTF TS hysteresis threshold 0.44 * VCC V ± 0.03V High-temperature fault VTCO TS minimum threshold 0.4 * VCC V ± 0.03V Temperature cutoff VHCO High cutoff voltage 2.3V V 1% VMIN Under-voltage threshold at BAT 0.2 * VCC V ± 0.
PAGE 12
bq2054 Recommended DC Operating Conditions (TA = TOPR) Symbol Parameter VCC Supply voltage VTEMP Minimum Typical Maximum Unit Notes 4.5 5.0 5.5 V Temperature sense voltage 0 - VCC V VTS - VSNS VCELL Per cell battery voltage input 0 - VCC V VBAT - VSNS ICC Supply current - 2 4 mA Outputs unloaded DSEL tri-state open detection -2 - 2 µA Note 2 ITERM tri-state open detection -2 2 µA IIZ VIH Logic input high VCC-0.
PAGE 13
bq2054 Impedance Symbol Parameter Minimum Typical Maximum Unit Notes RBATZ BAT pin input impedance 50 - - MΩ RSNSZ SNS pin input impedance 50 - - MΩ RTSZ TS pin input impedance 50 - - MΩ RPROG1 Soft-programmed pull-up or pull-down resistor value (for programming) - - 10 kΩ DSEL RPROG2 Pull-up or pull-down resistor value - - 3 kΩ ITERM RMTO Charge timer resistor 20 - 480 kΩ Timing (TA = TOPR; VCC = 5V ± 10%) Symbol Parameter Minimum Typical Maximum Unit No
PAGE 14
bq2054 16-Pin DIP Narrow (PN) 16-Pin PN (0.300" DIP) Inches Millimeters Dimension Min. Max. Min. Max. A 0.160 0.180 4.06 4.57 A1 0.015 0.040 0.38 1.02 B 0.015 0.022 0.38 0.56 B1 0.055 0.065 1.40 1.65 C 0.008 0.013 0.20 0.33 D 0.740 0.770 18.80 19.56 E 0.300 0.325 7.62 8.26 E1 0.230 0.280 5.84 7.11 e 0.300 0.370 7.62 9.40 G 0.090 0.110 2.29 2.79 L 0.115 0.150 2.92 3.81 S 0.020 0.040 0.51 1.02 16-Pin SOIC Narrow (SN) 16-Pin SN (0.
PAGE 15
bq2054 Data Sheet Revision History Change No. Page No. 1 Description Nature of Change 5, 7, 8, 10 Value Change 2 5, 10 3 Changed VSNS and IMAX Value Change Changed VREF 10 Coefficient Addition Temperature coefficient added 4 5 New state diagram Diagram inserted 4 1, 2, 8, 12 4 3, 5, 13 5 11 VHCO Rating changed to 2.3V VHCO Tolerance changed to 1% Changed values for VHCO 6 13 tQT in Timing Specifications tQT changed from (0.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 29-Jul-2008 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ2054SNTR Package Package Pins Type Drawing SOIC D 16 SPQ Reel Reel Diameter Width (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 A0 (mm) B0 (mm) K0 (mm) P1 (mm) 6.5 10.3 2.1 8.0 W Pin1 (mm) Quadrant 16.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 29-Jul-2008 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ2054SNTR SOIC D 16 2500 346.0 346.0 33.
PAGE 19
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.