MAX712 Maxim, MAX712 Datasheet
MAX712
Manufacturer Part Number
MAX712
Description
NiCd/NiMH Battery Fast-Charge Controllers
Manufacturer
Maxim
Datasheet
1.MAX712.pdf
(18 pages)
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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 5 A 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
19-0100; Rev 3; 1/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
__________________Pin Configuration
TOP VIEW
Battery-Powered Equipment
Portable Consumer Products
Laptop, Notebook, and Palmtop Computers
Handy-Terminals
Cellular Phones
Portable Stereos
Cordless Phones
FASTCHG
VLIMIT
BATT+
PGM0
PGM1
TEMP
TLO
THI
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
8
MAX712
MAX713
DIP/SO
16
15
14
13
12
11
10
9
REF
V+
DRV
GND
BATT-
CC
PGM3
PGM2
Fast-Charge Controllers
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
____________________________Features
__________Typical Operating Circuit
______________Ordering Information
MAX712CPE
MAX712CSE
MAX712C/D
MAX712EPE
MAX712ESE
MAX712MJE
Fast Charge NiMH or NiCd Batteries
Voltage Slope, Temperature, and Timer
Fast-Charge Cutoff
Charge 1 to 16 Series Cells
Supply Battery’s Load while Charging (Linear Mode)
Fast Charge from C/4 to 4C Rate
C/16 Trickle-Charge Rate
Automatically Switch from Fast to Trickle Charge
Linear or Switch-Mode Power Control
5µA Max Drain on Battery when Not Charging
5V Shunt Regulator Powers External Logic
WALL
CUBE
PART
10 F
SEE FIGURE 19 FOR SWITCH-MODE CHARGER CIRCUIT.
DC IN
NiCd/NiMH Battery
R1
68k
22k
C1
1 F
R3
R4
0.01 F
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
C4
C2
0.01 F
TEMP
THI
V+
VLIMIT
REF
CC
BATT- TLO GND
MAX712
MAX713
R2
150
2N6109
BATT+
DRV
Q1
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 CERDIP**
PIN-PACKAGE
BATTERY
R
SENSE
D1
1N4001
C3
10 F
LOAD
1
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