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 -∆V,

maximum voltage, maximum

temperature, and maximum

time

➤

Internal band-gap voltage ref

erence

➤

Optional top-off charge

➤

Selectable pulse trickle charge

rates

➤ Low-power mode

➤ 8-pin 300-mil DIP or 150-mil

SOIC

General Description

The bq2002 and bq2002/F Fast-Charge

ICs are low-cost CMOS battery-charge

controllers providing reliable charge

termination for both NiCd and NiMH

battery applications. Controlling a

current-limited or constant-current

supply allows the bq2002/F to be the

basis for a cost-effective stand-alone or

system-integrated charger. The

bq2002/F 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:

Peak voltage detection (PVD)

Negative delta voltage (-∆V)

Maximum voltage

Maximum temperature

Maximum time

After fast charge, the bq2002/F op

tionally tops-off and pulse-trickles the

battery per the pre-configured limits.

Fast charge may be inhibited using

the INH pin. The bq2002/F may also

be placed in low-standby-power mode

to reduce systempowerconsumption.

The bq2002F differs from the

bq2002 only in that a slightly differ-

ent set of fast-charge and top-off

time limits is available. All differ-

ences between the two ICs are illus-

trated in Table 1.

NiCd/NiMH Fast-Charge Management ICs

bq2002/F

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

bq2002/F Selection Guide

Part No. TCO HTF LTF

-∆V

PVD Fast Charge t

MTO

Top-Off Maintenance

bq2002

0.5 ∗ V

None None

✔ C/2 160 C/32 C/64

✔ 1C 80 C/16 C/64

✔ 2C 40 None C/32

bq2002F

0.5 ∗ V

None None

✔ C/2 160 C/32 C/64

✔ 1C 100 C/16 C/64

✔ 2C 55 None C/32

SLUS131 – APRIL 2009

Summary of content (17 pages)

PAGE 1
bq2002/F 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 The bq2002 and bq2002/F Fast-Charge ICs are low-cost CMOS battery-charge controllers providing reliable charge termination for both NiCd and NiMH battery applications.
PAGE 2
bq2002/F TM Charge control output CC Pin Descriptions 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. CC is modulated to provide top-off, if enabled, and pulse trickle. Timer mode input 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.
PAGE 3
bq2002/F Chip on 4.0V VCC Battery Voltage? VBAT > 2V VBAT < 2V VTS > VCC/2 Fast LED = Low Battery Temperature? VBAT > 2V VTS < VCC/2 ((PVD or - V or Maximum Time-Out) and TM = high) (PVD or - V or Maximum Time-Out) and TM = high Top-off LED = Z VTS < VCC/2 VCC 2V Trickle LED = Z Maximum Time-Out or VBAT > 2V or VTS < VCC/2 SD2002/F01 Figure 2.
PAGE 4
bq2002/F VCC = 0 Fast Charging Top-Off (optional) Pulse-Trickle 286 s 286 s CC Output Fast Charging See Table 1 4576 s Charge initiated by application of power Charge initiated by battery replacement LED TD2002F1.eps Figure 4. Charge Cycle Phases If the battery voltage or temperature is outside of these limits, the IC pulse-trickle charges until the next new charge cycle begins.
PAGE 5
bq2002/F pin is modulated at a duty cycle of 286µs active for every 4290µs inactive. This modulation results in an average rate 1/16th that of the fast charge rate. Maximum voltage, time, and temperature are the only termination methods enabled during top-off. PVD and -∆V Termination There are two modes for voltage termination depending on the state of TM. For -∆V (TM = high), if VBAT is lower than any previously measured value by 12mV ±3mV, fast charge is terminated.
PAGE 6
bq2002/F 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 0 +70 °C TSTG Storage temperature -40 +85 °C TSOLDER Soldering temperature - +260 °C TBIAS Temperature under bias -40 +85 °C Note: Commercial 10 sec max. Permanent device damage may occur if Absolute Maximum Ratings are exceeded.
PAGE 7
bq2002/F Recommended DC Operating Conditions (TA = 0 to 70°C) Symbol Condition Minimum Typical Maximum Unit 4.0 5.0 6.0 V Notes VCC Supply voltage VDET -∆V, PVD detect voltage 1 - 2 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 + 0.5 V TM VIH VIM Logic input mid VCC - 0.5 2 - VCC 2 Logic input low - - 0.1 V INH Logic input low - - 0.
PAGE 8
bq2002/F Impedance Symbol Parameter Minimum Typical Maximum Unit RBAT Battery input impedance 50 - - MΩ RTS TS input impedance 50 - - MΩ Timing Symbol dFCV Note: (TA = 0 to +70°C; VCC ± 10%) Parameter Base time variation Minimum Typical Maximum Unit -20 - 20 % Typical is at TA = 25°C, VCC = 5.0V.
PAGE 9
bq2002/F 8-Pin DIP (PN) 8-Pin PN (0.300" DIP) Inches 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 D E1 E A B1 A1 L C B S e G 9 Millimeters Dimension 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 10
bq2002/F 8-Pin SOIC Narrow (SN) 8-Pin SN (0.150" SOIC) Inches 10 Millimeters Dimension Min. Max. Min. Max. A 0.060 0.070 1.52 1.78 A1 0.004 0.010 0.10 0.25 B 0.013 0.020 0.33 0.51 C 0.007 0.010 0.18 0.25 D 0.185 0.200 4.70 5.08 E 0.150 0.160 3.81 4.06 e 0.045 0.055 1.14 1.40 H 0.225 0.245 5.72 6.22 L 0.015 0.035 0.38 0.
PAGE 11
Ordering Information bq2002 Package Option: PN = 8-pin plastic DIP SN = 8-pin narrow SOIC Device: bq2002 Fast-Charge IC bq2002F Fast-Charge IC 11
PAGE 12
SLUS131A – April 2009 bq2002/F Data Sheet Revision History Change No. (1) (1) Page No. Description 1 3 Was: Table 1 gave the bq2002/F Operational Summary. Is: Figure 2 gives the bq2002/F Operational Summary. 1 5 Added Termination column to table and Top-off values. 2 All Revised and expanded this data sheet to include bq2002F 3 1 Revised and expanded this data sheet to include bq2002F 4 5 Voltage Sampling — From: Average of voltage measurements taken 57us apart.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PAGE 15
PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant BQ2002FSNTR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 BQ2002SNTR 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 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ2002FSNTR SOIC D 8 2500 340.5 338.1 20.6 BQ2002SNTR SOIC D 8 2500 340.5 338.1 20.
PAGE 17
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