Fast-Charge Management. BQ2000 Datasheet

BQ2000 Management. Datasheet pdf. Equivalent

Part BQ2000
Description Programmable Multi-Chemistry Fast-Charge Management
Feature bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009 Programmable Multi-Chemistry Fas.
Manufacture etcTI
Datasheet
Download BQ2000 Datasheet

bq2000 www.ti.com SLUS138D – JANUARY 2008 – REVISED DECEMB BQ2000 Datasheet
bq2000T www.ti.com SLUS149D – MAY 1999 – REVISED JANUARY 2 BQ2000T Datasheet
Recommendation Recommendation Datasheet BQ2000 Datasheet




BQ2000
bq2000
www.ti.com
SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009
Programmable Multi-Chemistry Fast-Charge Management IC
Check for Samples: bq2000
FEATURES
1
• Safe Management of Fast Charge for NiCd,
NiMH, or Li-Ion Battery Packs
• High-Frequency Switching Controller for
Efficient and Simple Charger Design
• Pre-Charge Qualification for Detecting
Shorted, Damaged, or Overheated Cells
• Fast-Charge Termination by Peak Voltage
(PVD) for Nickel chemistries, Minimum Current
for Li-Ion chemistries, Maximum Temperature,
and Maximum Charge Time
• Selectable Top-Off Mode for Achieving
Maximum Capacity in NiMH Batteries
• Programmable Trickle-Charge Mode for
Reviving Deeply Discharged Batteries and for
Postcharge Maintenance
• Built-in Battery Removal and Insertion
Detection
• Sleep Mode for Low Power Consumption
APPLICATIONS
• Multi-Chemistry Charger
• Nickel Charger
• High-Power, Multi-Cell Charger
8-Pin DIP or Narrow SOIC or TSSOP
SNS
VSS
LED
BAT
1
2
3
4
8 MOD
7 VCC
6 RC
5 TS
GENERAL DESCRIPTION
The bq2000 is a programmable, monolithic IC for
fast-charge management of nickel cadmium (NiCd),
nickel metal-hydride (NiMH), or lithium-ion (Li-Ion)
batteries in single- or multi-chemistry applications.
The bq2000 chooses the proper battery chemistry
(either nickel or lithium) and proceeds with the
optimal charging and termination algorithms. This
process eliminates undesirable, undercharged, or
overcharged conditions, and allows accurate and safe
termination of fast charge
Depending on the chemistry, the bq2000 provides a
number of charge termination criteria:
• Peak voltage, PVD (for NiCd and NiMH)
• Minimum charge current (for Li-Ion)
• Maximum temperature
• Maximum charge time
For safety, the bq2000 inhibits fast charge until the
battery voltage and temperature are within
user-defined limits. If the battery voltage is below the
low-voltage threshold, the bq2000 uses trickle-charge
to condition the battery. For NiMH batteries, the
bq2000 provides an optional top-off charge to
maximize the battery capacity.
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
Pin Names
SNS Current-sense input
VSS
LED
System ground
Charge-status output
BAT Battery-voltage input
TS Temperature-sense input
RC Timer-program input
VCC Supply-voltage input
MOD Modulation-control output
1
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.
Copyright © 2008–2009, Texas Instruments Incorporated



BQ2000
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.
PIN DESCRIPTIONS
SNS
VSS
LED
BAT
TS
RC
VCC
MOD
Current-sense input
Enables the bq2000 to sense the battery current via the voltage developed on this pin by an external
sense-resistor connected in series with the battery pack
System Ground
Connect to the battery’s negative terminal
Charge-status output
Open-drain output that indicates the charging status by turning on, turning off, or flashing an external
LED, driven through a resistor.
Battery-voltage input
Battery-voltage sense input. A simple resistive divider, across the battery terminals, generates this
input.
Temperature-sense input
Input for an external battery-temperature monitoring circuit. An external resistive divider network with
a negative temperature-coefficient thermistor sets the lower and upper temperature thresholds.
Timer-program input
Used to program the maximum fast charge-time, maximum top-off charge-time, hold-off period, trickle
charge rate, and to disable or enable top-off charge. A capcitor from VCC and a resistor to ground
connect to this pin.
Supply-voltage input
Recommended bypassing is 10µF + 0.1µF to 0.22µF of decoupling capacitance near the pin.
Modulation-control output
Push-pull output that controls the charging current to the battery. MOD switches high to enable
charging current to flow and low to inhibit charging-current flow.
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Product Folder Link(s): bq2000
Copyright © 2008–2009, Texas Instruments Incorporated





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