|
|
PDF MAX2003 Data sheet ( Hoja de datos )
| Número de pieza | MAX2003 | |
| Descripción | NiCd/NiMH Battery Fast-Charge Controllers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX2003 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
19-0371; Rev 4; 5/97
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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
VSS 8
MAX2003
MAX2003A
16 VCC
15 DIS
14 MOD
13 CHG
12 TEMP
11 MCV
10 TCO
9 SNS
DIP/SO
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
NiCd/NiMH Battery
Fast-Charge Controllers
Figure 1. Switched-Mode Operation for NiMH Batteries with ∆T/∆t Termination
_______________________________________________________________________________________ 5
5 Page 
NiCd/NiMH Battery
Fast-Charge Controllers
Negative Delta Voltage Termination
The Negative Delta Voltage Termination (-∆V) method
measures a negative delta voltage to determine termi-
nation of fast-charge. After maximum charge is
reached, the terminal voltage of NiCd batteries
declines significantly, whereas the terminal voltage of
NiMH batteries does not. Hence, the -∆V method of
fast-charge termination is suitable for NiCd batteries,
but not for NiMH batteries.
The MAX2003/MAX2003A sample the BAT pin every 34
seconds and compare it with all previous values. If the
new value is less than any of the previous values by
more than 12mV, a negative delta voltage has been
detected and fast-charge is terminated.
Note: This method of charge termination is valid only
when the voltage at BAT is between VMCV and VMCV -
0.2VCC.
The -∆V method is inhibited during the hold-off time to
prevent false termination of fast-charge. The hold-off
time depends on the charge rate used, and is selected
by the inputs TM1 and TM2 (as shown in Table 4). After
the hold-off time has expired, the device begins to
monitor BAT for a voltage drop.
Maximum Temperature Termination
The Maximum Temperature Termination method is used
as a safety net to prevent problems, and should never
be needed under normal operation of the charger. The
maximum temperature that the battery can reach during
fast-charge has a corresponding voltage—the tempera-
ture cutoff voltage (VTCO), as seen in Figure 5. This volt-
age is set externally at the TCO pin using a resistor
divider from VCC. Although rarely experienced, an
excessively low temperature will also terminate fast-
charge. The minimum temperature is the low tempera-
ture fault (VLTF). This value is internally set at 0.4VCC.
When the thermistor exceeds these temperature limits,
fast-charge is terminated. The thermistor configuration
shown in Figure 5 is used to measure the battery’s tem-
perature and scale it to operate from VLTF to VTCO.
Resistors RT1 and RT2 are calculated to provide the
required cutoff at VTCO. See the Design Guide section
for a detailed design example.
Maximum Voltage Termination
The Maximum Voltage Termination method is another
safety feature designed to work if something is drastically
wrong. Under normal operation of the charger, this condi-
tion should only be reached when the battery is removed.
The maximum cell voltage expected is applied at the
MCV pin using a resistor-divider network. If the cell volt-
age measured at BAT exceeds that at MCV, fast-
charge is terminated. For most applications using both
NiCd and NiMH batteries, this voltage (VMCV) can be
set to 1.9V.
The MAX2003/MAX2003A do not terminate fast-charge
if the maximum voltage is reached before the hold-off
time has expired. If the cell voltage is greater than the
MCV during the hold-off time, the device will continue
fast-charge until the hold-off time has expired, and then
it will terminate fast-charge. The hold-off time is deter-
mined by the inputs TM1 and TM2, as shown in Table 4.
Maximum Timeout Termination
The final method is Maximum Timeout Termination,
which (like the maximum voltage and maximum tem-
perature methods) is another backup safety feature.
The timeout time depends on the charge rate selected
and is set by the control signals TM1 and TM2. Table 4
shows a list of different timeout periods available for dif-
ferent control-signal inputs. If the timeout is reached
before any other termination method is seen, fast-
charge is terminated to protect the charger and battery.
Top-Off Charge
Top-off charge is used to provide the last bit of charge
needed to reach full capacity after fast-charge is termi-
nated. Top-off charging puts slightly more energy into
the battery than simple trickle charging, and can be
used for both NiCd and NiMH batteries. Select it by
choosing the appropriate control signals on TM1 and
TM2 (Table 4).
Table 4. Programmable Inputs for
Timeout/Hold-Off/Fast-Charge/Top-Off/
Pulse Trickle (VCC = 5V)
TM1
TM2
Fast-
Charge
Rate
Fast-
Charge
Timeout
(min)
Hold-Off
Time
∆V/MCV
(sec)
Top-Off
Charge
MAX2003A MAX2003A
Trickle Sampling
Charge (s) Interval
On/Off
(sec)
GND GND C/4 360 140 Disable Disable
Open GND C/2 180 820 Disable 1 16
VCC GND C 90 410 Disable 1 32
GND Open 2C 45 200 Disable 1 64
Open Open 4C 23 100 Disable 1 128
VCC Open C/2 180 820 *Enable 0.5 16
GND VCC C 90 410 *Enable 0.5 32
Open VCC 2C 45 200 *Enable 0.5 64
VCC VCC 4C 23 100 *Enable 0.5 128
* MAX2003 is on for 4sec and off for 30sec.
MAX2003A is on for 0.5sec and off for 3.5sec.
544
544
136
68
68
544
136
68
68
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX2003.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX200 | RS-232 Transceivers | Maxim Integrated |
| MAX20002 | 2A/3A Fully Integrated Step-Down Converters | Maxim Integrated |
| MAX20003 | 2A/3A Fully Integrated Step-Down Converters | Maxim Integrated |
| MAX2003 | NiCd/NiMH Battery Fast-Charge Controllers | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |