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PDF MAX713MJE Data sheet ( Hoja de datos )
| Número de pieza | MAX713MJE | |
| Descripción | NiCd/NiMH Battery Fast-Charge Controllers | |
| Fabricantes | Maxim Integrated | |
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19-0100; Rev 3; 1/97
EVAFLOULALTOIWONDKAITTAMSAHNEUEATLS
NiCd/NiMH Battery
Fast-Charge Controllers
_______________General Description
The MAX712/MAX713 fast charge Nickel Metal Hydride
(NiMH) and Nickel Cadmium (NiCd) batteries from a DC
source at least 1.5V higher than the maximum battery
voltage. 1 to 16 series cells can be charged at rates up
to 4C. A voltage-slope detecting analog-to-digital convert-
er, timer, and temperature window comparator determine
charge completion. The MAX712/MAX713 are powered
by the DC source via an on-board +5V shunt regulator.
They draw a maximum of 5µA from the battery when not
charging. A low-side current-sense resistor allows the
battery charge current to be regulated while still
supplying power to the battery’s load.
The MAX712 terminates fast charge by detecting zero
voltage slope, while the MAX713 uses a negative
voltage-slope detection scheme. Both parts come in 16-
pin DIP and SO packages. An external power PNP tran-
sistor, blocking diode, three resistors, and three
capacitors are the only required external components.
For high-power charging requirements, the MAX712/
MAX713 can be configured as a switch-mode battery
charger that minimizes power dissipation. Two evaluation
kits are available: Order the MAX712EVKIT-DIP for quick
evaluation of the linear charger, and the MAX713EVKIT-
SO to evaluate the switch-mode charger.
________________________Applications
Battery-Powered Equipment
Laptop, Notebook, and Palmtop Computers
Handy-Terminals
Cellular Phones
Portable Consumer Products
Portable Stereos
Cordless Phones
____________________________Features
o Fast Charge NiMH or NiCd Batteries
o Voltage Slope, Temperature, and Timer
Fast-Charge Cutoff
o Charge 1 to 16 Series Cells
o Supply Battery’s Load while Charging (Linear Mode)
o Fast Charge from C/4 to 4C Rate
o C/16 Trickle-Charge Rate
o Automatically Switch from Fast to Trickle Charge
o Linear or Switch-Mode Power Control
o 5µA Max Drain on Battery when Not Charging
o 5V Shunt Regulator Powers External Logic
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX712CPE
0°C to +70°C
16 Plastic DIP
MAX712CSE
0°C to +70°C
16 Narrow SO
MAX712C/D
0°C to +70°C
Dice*
MAX712EPE
-40°C to +85°C
16 Plastic DIP
MAX712ESE
-40°C to +85°C
16 Narrow SO
MAX712MJE
-55°C to +125°C 16 CERDIP**
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
DC IN
Q1
2N6109
C4
R1 0.01µF
R2
150Ω
__________________Pin Configuration
TOP VIEW
VLIMIT 1
BATT+ 2
PGM0 3
PGM1 4
THI 5
TLO 6
TEMP 7
FASTCHG 8
MAX712
MAX713
16 REF
15 V+
14 DRV
13 GND
12 BATT-
11 CC
10 PGM3
9 PGM2
WALL
CUBE
10µF
C1
1µF
R3
68kΩ
R4
22kΩ
THI DRV
V+
D1
1N4001
VLIMIT
REF
BATT+
MAX712
MAX713
TEMP
BATTERY
CC BATT- TLO GND
C3
10µF
LOAD
C2
0.01µF
RSENSE
DIP/SO
SEE FIGURE 19 FOR SWITCH-MODE CHARGER CIRCUIT.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
NiCd/NiMH Battery
Fast-Charge Controllers
______________________________________________________________Pin Description
PIN
1
2
3, 4
5
6
7
8
9, 10
11
12
13
14
15
16
NAME
VLIMIT
BATT+
FUNCTION
Sets the maximum cell voltage. The battery terminal voltage (BATT+ - BATT-) will not exceed VLIMIT x
(number of cells). Do not allow VLIMIT to exceed 2.5V. Tie VLIMIT to VREF for normal operation.
Positive terminal of battery
PGM0,
PGM1
PGM0 and PGM1 set the number of series cells to be charged. The number of cells can be set from
1 to 16 by connecting PGM0 and PGM1 to any of V+, REF, or BATT-, or by leaving the pin open (Table
2). For cell counts greater than 11, see the Linear-Mode, High Series Cell Count section. Charging more
or fewer cells than the number programmed may inhibit ∆V fast-charge termination.
THI
TLO
TEMP
FASTCHG
PGM2,
PGM3
Trip point for the over-temperature comparator. If the voltage-on TEMP rises above THI, fast charge ends.
Trip point for the under-temperature comparator. If the MAX712/MAX713 power on with the voltage-on
TEMP less than TLO, fast charge is inhibited and will not start until TEMP rises above TLO.
Sense input for temperature-dependent voltage from thermistors.
Open-drain, fast-charge status output. While the MAX712/MAX713 fast charge the battery, FASTCHG
sinks current. When charge ends and trickle charge begins, FASTCHG stops sinking current.
PGM2 and PGM3 set the maximum time allowed for fast charging. Timeouts from 33 minutes to 264
minutes can be set by connecting to any of V+, REF, or BATT-, or by leaving the pin open (Table 3).
PGM3 also sets the fast-charge to trickle-charge current ratio (Table 5).
CC
BATT-
GND
DRV
V+
REF
Compensation input for constant current regulation loop
Negative terminal of battery
System ground. The resistor placed between BATT- and GND monitors the current into the battery.
Current sink for driving the external PNP current source
Shunt regulator. The voltage on V+ is regulated to +5V with respect to BATT-, and the shunt current
powers the MAX712/MAX713.
2V reference output
_______________________________________________________________________________________ 5
5 Page 
NiCd/NiMH Battery
Fast-Charge Controllers
Table 5. Trickle-Charge Current
Determination from PGM3
PGM3
V+
OPEN
REF
BATT-
Fast-Charge Rate
4C
2C
C
C/2
Trickle-Charge
Current (ITRICKLE)
IFAST/64
IFAST/32
IFAST/16
IFAST/8
DC IN
Q1
DRV
MAX712
MAX713 FASTCHG
V+
10k
10k
D1
R7
BATTERY
Q2
The MAX712/MAX713 internally set the trickle-charge
current by increasing the current amplifier gain (Figure
6), which adjusts the voltage across RSENSE (see
Trickle-Charge VSENSE in the Electrical Characteristics
table).
Configuration:
Nonstandard Trickle-Charge
Current Example
Typical Operating Circuit
2 x Panasonic P-50AA 500mAh AA NiCd batteries
C/3 fast-charge rate
264-minute timeout
Negative voltage-slope cutoff enabled
Minimum DC IN voltage of 6V
Settings:
Use MAX713
PGM0 = V+, PGM1 = open, PGM2 = BATT-,
PGM3 = BATT-, RSENSE = 1.5Ω (fast-charge current,
IFAST = 167mA), R1 = (6V - 5V) / 5mA = 200Ω
Since PGM3 = BATT-, the voltage on RSENSE is regulat-
ed to 31.3mV during trickle charge, and the current is
20.7mA. Thus the trickle current is actually C/25, not
C/16.
Further Reduction of Trickle-Charge
Current for NiMH Batteries
The trickle-charge current can be reduced to less than
C/16 using the circuit in Figure 7. In trickle charge,
some of the current will be shunted around the battery,
since Q2 is turned on. Select the value of R7 as follows:
R7 = (VBATT + 0.4V) / (lTRlCKLE - IBATT)
where
VBATT = battery voltage when charged
ITRlCKLE = MAX712/MAX713 trickle-charge
current setting
IBATT = desired battery trickle-charge current
RSENSE
GND
Figure 7. Reduction of Trickle Current for NiMH Batteries
(linear mode)
Regulation Loop
The regulation loop controls the output voltage between
the BATT+ and BATT- terminals and the current
through the battery via the voltage between BATT- and
GND. The sink current from DRV is reduced when the
output voltage exceeds the number of cells times
VLIMIT, or when the battery current exceeds the pro-
grammed charging current.
For a linear-mode circuit, this loop provides the following
functions:
1) When the charger is powered, the battery can be
removed without interrupting power to the load.
2) If the load is connected as shown in the Typical
Operating Circuit, the battery current is regulated
regardless of the load current (provided the input
power source can supply both).
Voltage Loop
The voltage loop sets the maximum output voltage
between BATT+ and BATT-. If VLIMIT is set to less than
2.5V, then:
Maximum BATT+ voltage (referred to BATT-) = VLIMIT x
(number of cells as determined by PGM0, PGM1)
VLIMIT should be set between 1.9V and 2.5V. If VLIMIT
is set below the maximum cell voltage, proper
termination of the fast-charge cycle might not occur.
Cell voltage can approach 1.9V/cell, under fast charge,
in some battery packs. Tie VLIMIT to VREF for normal
operation .
With the battery removed, the MAX712/MAX713 do not
provide constant current; they regulate BATT+ to the
maximum voltage as determined above.
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX713MJE.PDF ] | |
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