Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management Li-Ion, NiCd, NiMH TSSOP 8 Surface-mount

SNS

LED

BAT

MOD

bq2000

www.ti.com

SLUS138D –JANUARY 2008–REVISED DECEMBER 2009

Programmable Multi-Chemistry Fast-Charge Management IC

Check for Samples: bq2000

FEATURES

GENERAL DESCRIPTION

• Safe Management of Fast Charge for NiCd,

NiMH, or Li-Ion Battery Packs

The bq2000 is a programmable, monolithic IC for

fast-charge management of nickel cadmium (NiCd),

• High-Frequency Switching Controller for

nickel metal-hydride (NiMH), or lithium-ion (Li-Ion)

Efficient and Simple Charger Design

batteries in single- or multi-chemistry applications.

• Pre-Charge Qualification for Detecting

The bq2000 chooses the proper battery chemistry

Shorted, Damaged, or Overheated Cells

(either nickel or lithium) and proceeds with the

• Fast-Charge Termination by Peak Voltage

optimal charging and termination algorithms. This

(PVD) for Nickel chemistries, Minimum Current

process eliminates undesirable, undercharged, or

overcharged conditions, and allows accurate and safe

for Li-Ion chemistries, Maximum Temperature,

termination of fast charge

and Maximum Charge Time

• Selectable Top-Off Mode for Achieving

Depending on the chemistry, the bq2000 provides a

Maximum Capacity in NiMH Batteries number of charge termination criteria:

• Peak voltage, PVD (for NiCd and NiMH)

• Programmable Trickle-Charge Mode for

Reviving Deeply Discharged Batteries and for

• Minimum charge current (for Li-Ion)

Postcharge Maintenance

• Maximum temperature

• Built-in Battery Removal and Insertion

• Maximum charge time

Detection

For safety, the bq2000 inhibits fast charge until the

• Sleep Mode for Low Power Consumption

battery voltage and temperature are within

user-defined limits. If the battery voltage is below the

APPLICATIONS

low-voltage threshold, the bq2000 uses trickle-charge

to condition the battery. For NiMH batteries, the

• Multi-Chemistry Charger

bq2000 provides an optional top-off charge to

• Nickel Charger

maximize the battery capacity.

• High-Power, Multi-Cell Charger

The integrated high-speed comparator allows the

bq2000 to be the basis for a complete, high-efficiency

battery charger circuit for both nickel-based and

lithium-based chemistries.

spacer between para and illustration

8-Pin DIP or Narrow SOIC or TSSOP Pin Names

SNS Current-sense input

System ground

LED Charge-status output

BAT Battery-voltage input

TS Temperature-sense input

RC Timer-program input

Supply-voltage input

MOD Modulation-control output

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (27 pages)

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bq2000 www.ti.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 FUNCTIONAL DESCRIPTION The bq2000 is a versatile, multi-chemistry battery charge control device. See Figure 1 for a functional block diagram and Figure 2 for a state diagram. TS Voltage Reference BAT OSC Voltage Comparators 3x ADC PVD ALU Clock Phase Generator Timer Charge Control LED Voltage Comparators MOD RC Internal OSC SNS VCC VSS Figure 1.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com VCC Reset or Battery Replacement at any time 4.0 V < VCC < 6.0 V Charge Initialization VBAT < VSLP VMCV < VBAT < VSLP Battery Voltage (Voltage at BAT pin checked continuously. PVD checked at rate of MTO/128.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 ABSOLUTE MAXIMUM RATINGS (1) VALUE UNIT –0.3 to 7 V –0.3 to VCC V Operating ambient temperature –20 to 70 °C Storage temperature –40 to 125 °C 260 °C VCC VCC relative to VSS VT DC voltage applied on any pin, relative to VSS TOPR TSTG TSOLDER Soldering temperature (10 s max.) (1) Permanent device damage may occur if Absolute Maximum Ratings are exceeded.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com Initiation and Charge Qualification The bq2000 initiates a charge cycle when it detects • Application of power to VCC • Battery replacement • Exit from sleep mode • Capacity depletion (Li-Ion only) Immediately following initiation, the IC enters a charge-qualification mode. The bq2000 charge qualification is based on battery voltage and temperature.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 Lithium-Ion Batteries The bq2000 uses a two-phase fast-charge algorithm for Li-Ion batteries (Figure 4). In phase one, the bq2000 regulates constant current until VBAT rises to VMCV. Once VBAT = VMCV, the device identifies the cell as a Li-ion, and changes the termination method from PVD to minimum current.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 hold-off period = www.ti.com MTO 32 (1) Maximum Charge Time (NiCD, NiMH, and Li-Ion) The bq2000 sets the maximum charge-time through the RC pin. With the proper selection of external resistor and capacitor values, various time-out values may be achieved. If the timer expires while still in constant-current charging, the bq2000 assumes a Nickel chemistry and proceeds to top-off charge (if top-off is enabled) or trickle maintenance charge.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 VCC 2 VCC 7 VSS RT1 bq2000 TS 5 RT2 N Battery T Pack C Figure 6. Temperature Monitoring Configuration During fast charge, the bq2000 compares the battery temperature to an internal high-temperature cutoff threshold, VTCO, and a low-temperature threshold, VLTF. During fast charge only, the VHTF fault comparator is disabled.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com Q1 FMMT718 D4 DC+ S1A D3 MMSD914LT L1 C6 47 mF BAT+ 47 mH Q2 MMBT3904LT1 D2 ZHCS1000 R12 120 OHMS D5 MMSD914LT C9 R10 1 KW 1000 PF Q3 MMBT3904LT1 VCC R2 2 KW D6 BZT52-C5V1 C3 10 mF C7 4.7 PF C4 0.0022 mF R1 D1 U1 1 SNS 2 VSS 3 LED 4 BAT RED R11 220 W C2 0.1 C8 0.33 mF R6 210 KW C5 10 mF R4 12.4K 100 KW 8 7 6 5 MOD VCC RC TS THERM bq2000 C1 0.1 R8 6.81 KW R9 R5 20 KW CHEMISTRY 221 KW BATR7 200 KW R13 1.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 During top-off, there are three different temperature faults that can occur. If VTS > VLTF, top-off is suspended, the timer is paused, and trickle charge is started. When VTS falls below VLTF, top-off is resumed. If VTS < VHTF, all charging stops, but the timer keeps counting. When VTS > VHTF, top-off is resumed, if there is still time remaining on the timer. If there is not time left, trickle maintenance charge is entered.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com Table 2.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 voltage and/or inductor value or decreasing CHYS and/or the Rf × Cf filter corner frequency will increase the switching frequency. Figure 10 and Figure 11 show empirical data on the variation in switching frequency based on adjusting Rf and Cf. This data was taken with an input voltage of 12V, inductor value of 220 µH, RSNS value of 50 mΩ, and CHYS value of 4.7 pF.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com TEMPERATURE MONITORING The bq2000 measures the temperature by the voltage at the TS pin. This voltage is typically generated by a negative-temperature-coefficient thermistor. The bq2000 compares this voltage against its internal threshold voltages to determine if charging is safe. These thresholds are the following: • High-temperature cutoff voltage: VTCO = 0.225 × VCC.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 Table 5. Summary of Li-Ion Charging Characteristics VALUE (1) PARAMETER Maximum cell voltage (VMCV) 2V Minimum pre-charge qualification voltage (VLBAT) 950 mV High-temperature cutoff voltage (VTCO) 0.225 × VCC High-temperature fault voltage (VHTF) 0.25 × VCC Low-temperature fault voltage (VLTF) 0.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS CH1 = RC pin, 2V/div CH1 = RC pin, 2V/div 1 CH2 = MOD pin, 5V/div CH2 = MOD pin, 5V/div Voltage - V Voltage - V 2 CH3 = VO, 5V/div 2 CH3 = VI, 5V/div 3 CH4 = LED pin, 5V/div 1 CH4 = LED pin, 5V/div 4 3 4 Time - 0.2s/div Time - 0.2s/div Figure 12. bq2000 Start-up on Battery Insertion Figure 13.
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bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 TYPICAL CHARACTERISTICS (continued) CH1 = VO, 5V/div 1 CH2 = RC pin, 1V/div CH1 = SNS pin, 20mV/div CH3 = MOD pin, 5V/div 2 Voltage - V Voltage - V 1 CH2 = MOD pin, 5V/div 3 2 4 CH4 = LED pin, 1V/div Time - 2ms/div Time - 10ms/div Figure 16. bq2000 in Fast Charge Figure 17.
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bq2000 SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 www.ti.com REVISION HISTORY Changes from Revision September 1998 (*) to Revision 1 Page • Changed the device status From: Preliminary To: Final ....................................................................................................... 1 • Changed the DC THRESHOLDS - VTCO, VHTF, VLTF Tolerance ............................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (3) 11-Apr-2013 MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Jun-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ2000PWR Package Package Pins Type Drawing TSSOP PW 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 12.4 Pack Materials-Page 1 7.0 B0 (mm) K0 (mm) P1 (mm) 3.6 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ2000PWR TSSOP PW 8 2000 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.