MAX712CPE Maxim Integrated Products, MAX712CPE Datasheet

IC BATT FASTCHRG NICD/NIMH 16DIP

MAX712CPE

Manufacturer Part Number
MAX712CPE
Description
IC BATT FASTCHRG NICD/NIMH 16DIP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX712CPE

Function
Charge Management
Battery Type
Nickel Cadmium (NiCd), Nickel Metal-Hydride (NiMH)
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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 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.
The evaluation kit is available: Order the MAX712EVKIT-
DIP for quick evaluation of the linear charger.
________________________Applications
19-0100; Rev 6; 12/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
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
General Description
MAX712
MAX713
DIP/SO
Pin Configuration
16
15
14
13
12
11
10
9
REF
V+
DRV
GND
BATT-
CC
PGM3
PGM2
Fast-Charge Controllers
♦ Fast-Charge NiMH or NiCd Batteries
♦ Voltage Slope, Temperature, and Timer
♦ Charge 1 to 16 Series Cells
♦ Supply Battery’s Load While Charging
♦ Fast Charge from C/4 to 4C Rate
♦ C/16 Trickle-Charge Rate
♦ Automatically Switch from Fast to Trickle Charge
♦ Linear Mode Power Control
♦ 5µA (max) Drain on Battery when Not Charging
♦ 5V Shunt Regulator Powers External Logic
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
MAX712CPE
MAX712CSE
MAX712C/D
MAX712EPE
MAX712ESE
MAX712MJE
Fast-Charge Cutoff
(Linear Mode)
WALL
CUBE
PART
10μF
NiCd/NiMH Battery
DC IN
R1
Typical Operating Circuit
68kΩ
22kΩ
C1
1μF
R3
R4
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
0.01μF
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
C4
Ordering Information
C2
0.01μF
TEMP
THI
V+
VLIMIT
REF
CC
BATT- TLO GND
MAX712
MAX713
R2
150Ω
2N6109
BATT+
DRV
Q1
BATTERY
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
16 CERDIP**
R
PIN-PACKAGE
Dice*
SENSE
Features
D1
1N4001
C3
10μF
LOAD
1

Related parts for MAX712CPE

MAX712CPE Summary of contents

Page 1

... C/16 Trickle-Charge Rate ♦ Automatically Switch from Fast to Trickle Charge ♦ Linear Mode Power Control ♦ 5µA (max) Drain on Battery when Not Charging ♦ 5V Shunt Regulator Powers External Logic PART MAX712CPE MAX712CSE MAX712C/D MAX712EPE MAX712ESE MAX712MJE Ordering Information continued at end of data sheet. ...

Page 2

NiCd/NiMH Battery Fast-Charge Controllers ABSOLUTE MAXIMUM RATINGS V+ to BATT- .................................................................-0.3V, +7V BATT- to GND ........................................................................±1V BATT+ to BATT- Power Not Applied............................................................±20V With Power Applied ................................The higher of ±20V or ±2V x (programmed cells) DRV to GND ..............................................................-0.3V, +20V FASTCHG ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 10mA unless otherwise noted. Refer to the Typical Operating Circuit. All measurements are with respect MIN MAX BATT-, not GND.) PARAMETER FASTCHG Low Current FASTCHG ...

Page 4

NiCd/NiMH Battery Fast-Charge Controllers (T = +25°C, unless otherwise noted.) A MAX713 NiCd BATTERY CHARGING CHARACTERISTICS AT C RATE 1.55 ΔV CUTOFF V 1.50 Δt T 1.45 1. CHARGE TIME (MINUTES) MAX713 NiCd BATTERY-CHARGING CHARACTERISTICS AT C/2 ...

Page 5

PIN NAME Sets the maximum cell voltage. The battery terminal voltage (BATT+ - BATT-) will not exceed VLIMIT x 1 VLIMIT (number of cells). Do not allow VLIMIT to exceed 2.5V. Connect VLIMIT to VREF for normal operation. 2 BATT+ ...

Page 6

NiCd/NiMH Battery Fast-Charge Controllers Getting Started The MAX712/MAX713 are simple to use. A complete linear-mode fast-charge circuit can be designed in a few easy steps. A linear-mode design uses the fewest components and supplies a load while charging. 1) Follow ...

Page 7

Table 2. Programming the Number of Cells NUMBER PGM1 OF CELLS CONNECTION Open 3 REF 4 BATT Open 7 REF 8 BATT Open 11 REF 12 BATT Open ...

Page 8

NiCd/NiMH Battery Fast-Charge Controllers Detailed Description The MAX712/MAX713 fast charge NiMH or NiCd batter- ies by forcing a constant current into the battery. The MAX712/MAX713 are always in one of two states: fast charge or trickle charge. During fast charge, ...

Page 9

The MAX712/MAX713 can be configured so that voltage slope and/or battery temperature detects full charge. Figure 4 shows a charging event in which a battery is inserted into an already powered-up MAX712/MAX713. During time 1, the charger’s output voltage is ...

Page 10

NiCd/NiMH Battery Fast-Charge Controllers REF DRV VLIMIT D1 CELL_VOLTAGE GND CURRENT-SENSE AMPLIFIER PGM3 FAST_CHARGE 512 OPEN 0 256 REF 0 128 BATT BATT- R SENSE BATT- GND 1.25V BATT- ...

Page 11

Table 5. Trickle-Charge Current Determination from PGM3 FAST-CHARGE PGM3 RATE V+ 4C OPEN 2C REF C BATT- C/2 Nonstandard Trickle-Charge Configuration: Typical Operating Circuit 2 x Panasonic P-50AA 500mAh AA NiCd batteries C/3 fast-charge rate 264-minute timeout Negative voltage-slope cutoff ...

Page 12

NiCd/NiMH Battery Fast-Charge Controllers The voltage loop is stabilized by the output filter capacitor. A large filter capacitor is required only if the load is going to be supplied by the MAX712/MAX713 in the absence of a battery. In this ...

Page 13

REF R3 THI HOT R4 0.022μF TEMP +2.0V COLD TLO MAX712 MAX713 BATT- AMBIENT TEMPERATURE NOTE: FOR ABSOLUTE TEMPERATURE CHARGE CUTOFF, T2 AND T3 CAN BE REPLACED BY STANDARD RESISTORS. Figure 9a. Temperature Comparators TEMPERATURE REF T2 THI HOT +2.0V ...

Page 14

NiCd/NiMH Battery Fast-Charge Controllers Linear-Mode, High Series Cell Count The absolute maximum voltage rating for the BATT+ pin is higher when the MAX712/MAX713 are powered on. If more than 11 cells are used in the battery, the BATT+ input voltage ...

Page 15

150Ω 33kΩ 500Ω DRV BATT+ MAX712 MAX713 Figure 15. Cascoding to Accommodate High Cell Counts for Linear-Mode Circuits D1 100kΩ MAX712 MAX713 * 100kΩ V+ GND Figure 16. Shunting R for Efficiency Improvement SENSE ______________________________________________________________________________________ ...

Page 16

NiCd/NiMH Battery Fast-Charge Controllers Ordering Information (continued) PART TEMP RANGE MAX713CPE 0°C to +70°C MAX713CSE 0°C to +70°C MAX713C/D 0°C to +70°C MAX713EPE -40°C to +85°C MAX713ESE -40°C to +85°C MAX713MJE -55°C to +125°C *Contact factory for dice specifications. **Contact ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2008 Maxim Integrated Products ...

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