Datasheet > MAX712_13

MAX712_13

更新时间： 2024-02-15 21:12:17

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美信 - MAXIM		/
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数据手册

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MAX712_13 数据手册

19-0100; Rev 3; 1/97

NiCd /NiMH Ba t t e ry

Fa s t -Ch a rg e Co n t ro lle rs

2/MAX713

_______________Ge n e ra l De s c rip t io n

____________________________Fe a t u re s

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

b a tte ry c ha rg e c urre nt to b e re g ula te d while s till

supplying power to the battery’s load.

♦ 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

The MAX712 terminates fast charge by detecting zero

volta g e s lop e , while the MAX713 us e s a ne g a tive

voltage-slope detection scheme. Both parts come in 16-

pin DIP and SO packages. An external power PNP tran-

s is tor, b loc king d iod e , thre e re s is tors , a nd thre e

capacitors are the only required external components.

______________Ord e rin g In fo rm a t io n

PART

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

Dice*

MAX712CPE

MAX712CSE

MAX712C/D

MAX712EPE

MAX712ESE

MAX712MJE

0°C to +70°C

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.

0°C to +70°C

-40°C to +85°C

-55°C to +125°C

16 Plastic DIP

16 Narrow SO

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.

________________________Ap p lic a t io n s

Battery-Powered Equipment

Laptop, Notebook, and Palmtop Computers

Handy-Terminals

__________Typ ic a l Op e ra t in g Circ u it

2N6109

DC IN

Cellular Phones

Portable Consumer Products

Portable Stereos

150Ω

0.01µF

Cordless Phones

DRV

THI

V+

__________________P in Co n fig u ra t io n

1N4001

WALL

CUBE

TOP VIEW

VLIMIT

REF

1µF

BATT+

REF

V+

VLIMIT

BATT+

PGM0

PGM1

THI

68kΩ

10µF

MAX712

MAX713

BATTERY

DRV

13 GND

12 BATT-

11 CC

MAX712

MAX713

TEMP

LOAD

22kΩ

10µF

CC BATT- TLO GND

TLO

PGM3

PGM2

TEMP

0.01µF

SENSE

FASTCHG

SEE FIGURE 19 FOR SWITCH-MODE CHARGER CIRCUIT.

DIP/SO

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

12 3 4 5 6 7...18

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