MAX2003 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – NiCd/NiMH Battery Fast-Charge Controllers

19-0371; Rev 4; 5/97
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NiCd/NiMH Battery
Fast-Charge Controllers
General Description
The MAX2003/MAX2003A are fast-charge battery charg-
ers (with conditioning) for NiCd (nickel cadmium) or
NiMH (nickel-metal hydride) rechargeable batteries. The
MAX2003A has the same features as the MAX2003 with
an additional pulsed trickle-charge mode to prevent den-
drite formation in NiMH batteries. Each can be config-
ured as a switch-mode current regulator or as a gating
controller for an external current source. Switch-mode
current regulation provides efficient energy transfer,
reducing power dissipation and the associated heating.
Gating control of an external current source requires
minimal components, saving space and cost.
On-chip algorithms determine charge termination, so the
MAX2003/MAX2003A can be used as stand-alone
chargers. Fast-charge termination is accomplished by
five methods: temperature slope, negative voltage
change, maximum temperature, maximum time, and
maximum voltage. As a safety feature, the start of fast-
charge is inhibited until battery voltage and temperature
are within safe limits. By selecting the appropriate
charge-termination method, a single circuit can be built
with the MAX2003/MAX2003A to fast-charge both NiMH
and NiCd batteries.
The MAX2003/MAX2003A provide a switch-activated
discharge-before-charge option that allows for battery
conditioning and more accurate capacity measure-
ment. Other features include optional top-off charging
and direct drivers for LED status lights.
The MAX2003, in DIP and wide SO packages, is a direct
plug-in replacement for the bq2003. The MAX2003/
MAX2003A also come in a space-saving narrow SO
package. The MAX2003A evaluation kit (MAX2003A
EVKIT-SO) is available to assist in designs.
________________________Applications
Battery-Powered Equipment:
Laptop, Notebook, and Palmtop Computers
Handy-Terminals
Portable Consumer Products:
Portable Stereos
Cordless Phones
Backup-Battery Applications:
Memory Hold-Up
Emergency Switchovers
____________________________Features
o Stand-Alone NiCd or NiMH Fast Chargers
o New Pulsed Trickle-Charge Mode (MAX2003A only)
o Provide Switch-Mode, Gated, or Linear Control
Regulation
o Small, Narrow SO Package Available
o On-Chip Fast-Charge Termination Methods:
• Temperature Slope
• Maximum Voltage
• Negative Delta Voltage • Maximum Time
• Maximum Temperature
o Automatically Switch from Fast-Charge to
Trickle-Charge or Top-Off Charge
o Optional Discharge-Before-Charge
o Directly Drive Status LEDs
o Optional Top-Off Charge
Ordering Information
PART
TEMP. RANGE
MAX2003CPE
0°C to +70°C
MAX2003CSE
0°C to +70°C
MAX2003CWE
0°C to +70°C
MAX2003C/D
0°C to +70°C
MAX2003ACPE
0°C to +70°C
MAX2003ACSE
0°C to +70°C
MAX2003ACWE 0°C to +70°C
MAX2003AC/D
0°C to +70°C
* Contact factory for dice specifications.
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Wide SO
Dice*
16 Plastic DIP
16 Narrow SO
16 Wide SO
Dice*
___________________Pin Configuration
TOP VIEW
CCMD ₁
DCMD 2
DVEN ₃
TM1 ₄
TM2 5
TS 6
BAT ₇
V_{SS 8}
MAX2003
MAX2003A
16 ^VCC
15 ^DIS
14 ^MOD
13 CHG
12 TEMP
11 MCV
10 TCO
9 SNS
DIP/SO
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