Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management NiCd, NiMH SOIC 8 Surface-mount

Features

➤ Fast charge of nickel cadmium

or nickel-metal hydride batter-

ies

➤ Direct LED output displays

charge status

➤ Fast-charge termination by

rate of rise of temperature,

maximum voltage, maximum

temperature, and maximum

time

➤ Internal band-gap voltage ref-

erence

➤ Optional top-off charge (bq2002T

only)

➤ Selectable pulse-trickle charge

rates (bq2002T only)

➤ Low-power mode

➤ 8-pin 300-mil DIP or 150-mil

SOIC

General Description

The bq2002D/T Fast-Charge IC are

low-cost CMOS battery-charge control-

lers able to provide reliable charge ter-

mination for both NiCd and NiMH bat-

tery applications. Controlling a

current-limited or constant-current

supply allows the bq2002D/T to be the

basis for a cost-effective stand-alone or

system-integrated charger. The

bq2002D/T integrates fast charge with

optional top-off and pulsed-trickle con-

trol in a single IC for charging one or

more NiCdor NiMHbatterycells.

Fast charge is initiated on application

of the charging supply or battery re-

placement. For safety, fast charge is

inhibited if the battery temperature

and voltage are outside configured

limits.

Fast charge is terminated by any of

the following:

Rate of temperature rise

Maximum voltage

Maximum temperature

Maximum time

After fast charge, the bq2002T option-

ally tops-off and pulse-trickles the

battery per the pre-configured limits.

Fast charge may be inhibited using

the INH pin. The bq2002D/T may be

placed in low-standby-power mode to

reduce system power consumption.

NiCd/NiMH Fast-Charge Management ICs

bq2002D/T

TM Timer mode select input

LED

Charging status output

BAT Battery voltage input

System ground

PN-200201.eps

8-Pin DIP or

Narrow SOIC

LED

BAT

INH

TS Temperature sense input

Supply voltage input

INH Charge inhibit input

CC Charge control output

Pin Connections

Pin Names

SLUS133 – APRIL 2009

bq2002D/T Selection Guide

Part No. TCO HTF LTF Fast Charge Time-Out Top-Off Maintenance

bq2002D

0.225 ∗ V

0.25 ∗ V

None

C/4 440 min None None

1C 110 min None None

2C 55 min None None

bq2002T

0.225 ∗ V

0.25 ∗ V

0.4 ∗ V

C/4 320 min C/64 C/256

1C 80 min C/16 C/256

2C 40 min None C/128

Summary of content (17 pages)

PAGE 1
bq2002D/T NiCd/NiMH Fast-Charge Management ICs Features General Description ➤ Fast charge of nickel cadmium or nickel-metal hydride batteries ➤ Direct LED output displays charge status ➤ Fast-charge termination by rate of rise of temperature, maximum voltage, maximum temperature, and maximum time The bq2002D/T Fast-Charge IC are low-cost CMOS battery-charge controllers able to provide reliable charge termination for both NiCd and NiMH battery applications.
PAGE 2
bq2002D/T sumes operation at the point where initially suspended. Pin Descriptions TM Timer mode input Charge control output CC A three-level input that controls the settings for the fast charge safety timer, voltage termination mode, top-off, pulse-trickle, and voltage hold-off time. LED An open-drain output used to control the charging current to the battery. CC switching to high impedance (Z) enables charging current to flow, and low to inhibit charging current.
PAGE 3
bq2002D/T Battery Voltage too High? Chip on 4.0V VCC VBAT > 2V VBAT < 2V VTS > 0.25V VCC Battery Temperature? Fast Charge, CC = Z LED = Low VTS < 0.25V VCC VBAT < 2V and VTS > 0.25V VCC T/ t or VBAT > 2V or VTS < 0.25V VCC or Maximum Time Out Charge Pending Off, CC = Low LED = Low VBAT > 2V VBAT 2V Off, CC = Low LED = Z SD2002D.eps Figure 2. bq2002D State Diagram Battery Voltage too High? Chip on 4.0V VCC VBAT > 2V VBAT < 2V 0.25 VCC < VTS < 0.
PAGE 4
bq2002D/T Clock Phase Generator OSC TM Timing Control Sample History Voltage Reference T/ t ALU A to D Converter INH Charge-Control State Machine HTF/ LTF Check MCV Check Power-On Reset CC LED Power Down BAT TS TCO Check VCC VSS Bd2002TD.eps Figure 4. Block Diagram If the battery voltage or temperature is outside of these limits, the IC pulse-trickle charges until the temperature falls within the allowed fast charge range or a new charge cycle is started.
PAGE 5
bq2002D/T VCC = 0 Fast Charging Top-Off (optional, bq2002T only) 286 s 286 s CC Output Fast Charging (optional, bq2002T only) Pulse-Trickle See Table 1 4576 s Charge initiated by application of power Charge initiated by battery replacement LED TD2002F1.eps Figure 5. Charge Cycle Phases nique minimizes the effect of any AC line ripple that may feed through the power supply from either 50Hz or 60Hz AC sources. Tolerance on all timing is ±20%.
PAGE 6
bq2002D/T enforced again on the top-off phase, if selected (bq2002T only). There is no time limit on the trickle-charge phase. Charge Status Indication In the fast charge and charge pending states, and whenever the inhibit pin is active, the LED pin goes low. The LED pin is driven to the high-Z state for all other conditions. Figure 3 outlines the state of the LED pin during charge.
PAGE 7
bq2002D/T Absolute Maximum Ratings Minimum Maximum Unit VCC Symbol 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 0 +70 °C TSTG Storage temperature -40 +85 °C TSOLDER Soldering temperature - +260 °C TBIAS Temperature under bias -40 +85 °C Note: Parameter Commercial 10s max. Permanent device damage may occur if Absolute Maximum Ratings are exceeded.
PAGE 8
bq2002D/T Recommended DC Operating Conditions (TA = 0 to 70°C) Symbol Condition Minimum Typical Maximum Unit Notes VCC Supply voltage 4.0 5.0 6.0 V VBAT Battery input 0 - VCC V VTS Thermistor input 0.5 - VCC V VTS < 0.5V prohibited Logic input high 0.5 - - V INH Logic input high VCC - 0.5 - - V TM V TM VIH VIM Logic input mid VCC - 0.5 2 - VCC 2 + 05 . Logic input low - - 0.1 V INH Logic input low - - 0.5 V TM VOL Logic output low - - 0.
PAGE 9
bq2002D/T Impedance Symbol Parameter Minimum Typical Maximum Unit RBAT Battery input impedance 50 - - MΩ RTS TS input impedance 50 - - MΩ Timing Symbol (TA = 0 to +70°C; VCC ±10%) Parameter Minimum Typical Maximum Unit -20 - 20 % dFCV Time-base variation Note: Typical is at TA = 25°C, VCC = 5.0V.
PAGE 10
bq2002D/T 8-Pin DIP (PN) 8-Pin PN (0.300" DIP) Inches D E1 E A L B1 A1 C e B S G Millimeters Dimension A Min. Max. Min. Max. 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 0.350 0.380 8.89 9.65 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.
PAGE 11
Ordering Information bq2002 Package Option: PN = 8-pin plastic DIP SN = 8-pin narrow SOIC* Device: D = bq2002D Fast-Charge IC T = bq2002T Fast-Charge IC * bq2002D is only available in the 8-pin narrow SOIC package 11
PAGE 12
SLUS133D – April 2009 bq2002D/T Data Sheet Revision History Change No. Page No. Description Nature of Change 3 Was: Table 1 gave the bq2002D/T Operational Summary. Is: Figure 2 gives the bq2002D/T Operational Summary. Changed table to figure. 1 5 Added top-off values.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2014 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 16-Apr-2009 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel Diameter Width (mm) W1 (mm) A0 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant BQ2002DSNTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 BQ2002TSNTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 16-Apr-2009 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ2002DSNTR SOIC D 8 2500 340.5 338.1 20.6 BQ2002TSNTR SOIC D 8 2500 340.5 338.1 20.
PAGE 17
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