Rainbow-electronics MAX1870A Manuale Utente Scaricare il pdf (Pagina 1)

General Description

The MAX1870A step-up/step-down multichemistry bat-

tery charger charges with battery voltages above and

below the adapter voltage. This highly integrated

charger requires a minimum number of external compo-

nents. The MAX1870A uses a proprietary step-up/step-

down control scheme that provides efficient charging.

Analog inputs control charge current and voltage, and

can be programmed by the host or hardwired.

The MAX1870A accurately charges two to four lithium-

ion (Li+) series cells at greater than 4A. A programma-

ble input current limit is included, which avoids

overloading the AC adapter when supplying the load

and the battery charger simultaneously. This reduces

the maximum adapter current, which reduces cost. The

MAX1870A provides analog outputs to monitor the cur-

rent drawn from the AC adapter and charge current. A

digital output indicates the presence of an AC adapter.

When the adapter is removed, the MAX1870A con-

sumes less than 1µA from the battery.

The MAX1870A is available in a 32-pin thin QFN (5mm

x 5mm) package and is specified over the -40°C to

+85°C extended temperature range. The MAX1870A

evaluation kit (MAX1870AEVKIT) is available to help

reduce design time.

Applications

Notebook and Subnotebook Computers

Hand-Held Terminals

Features

♦ Patented Step-Up/Step-Down Control Scheme*

♦ ±0.5% Charge-Voltage Accuracy

♦ ±9% Charge-Current Accuracy

♦ ±8% Input Current-Limit Accuracy

♦ Programmable Maximum Battery Charge Current

♦ Analog Inputs Control Charge Current, Charge

Voltage, and Input Current Limit

♦ Analog Output Indicates Adapter Current

♦ Input Voltage from 8V to 28V

♦ Battery Voltage from 0 to 17.6V

♦ Charges Li+ or NiCd/NiMH Batteries

♦ Tiny 32-Pin Thin QFN (5mm x 5mm) Package

MAX1870A

Step-Up/Step-Down

Li+ Battery Charger

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX1870A

REFIN

DCIN

CSSP

CSSN

DHI

DBST

CSIP

CSIN

BATT

SHDN

ASNS

VCTL

IINP

PGND

SYSTEM

LOAD

GND

ICTL

CLS

CELLS

FROM WALL ADAPTER

CSSS

VHN

VHP

BLKP

REF

LDO

DLOV

Typical Operating Circuit

19-3243; Rev 0; 4/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX1870AETJ

-40°C to +85°C 32 Thin QFN

*Protected by U.S. Patent No. 6,087,816.

1 2 3 4 5 6 ... 31 32

Sommario

Pagina 1 - Li+ Battery Charger

General DescriptionThe MAX1870A step-up/step-down multichemistry bat-tery charger charges with battery voltages above andbelow the adapter voltage. Th

Pagina 2

MAX1870AStep-Up/Step-Down Li+ Battery Charger10 ______________________________________________________________________________________Typical Operatin

Pagina 3

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 11Typical Operatin

Pagina 4

MAX1870AStep-Up/Step-Down Li+ Battery Charger12 ______________________________________________________________________________________Typical Operatin

Pagina 5

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 13Pin Description

Pagina 6

MAX1870AStep-Up/Step-Down Li+ Battery Charger14 ______________________________________________________________________________________MAX1870A234VHPVH

Pagina 7

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 1523476VHPVHNCSSPC

Pagina 8

MAX1870AStep-Up/Step-Down Li+ Battery Charger16 ______________________________________________________________________________________Detailed Descrip

Pagina 9

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 17MAX1870ACSSNCSSP

Pagina 10

MAX1870AStep-Up/Step-Down Li+ Battery Charger18 ______________________________________________________________________________________The input source

Pagina 11

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 19• Continuous out

Pagina 12

MAX1870AStep-Up/Step-Down Li+ Battery Charger2 _______________________________________________________________________________________ABSOLUTE MAXIMUM

Pagina 13

MAX1870AStep-Up/Step-Down Li+ Battery Charger20 ______________________________________________________________________________________up operation. Du

Pagina 14

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 21STATE BSTATE APR

Pagina 15

MAX1870AStep-Up/Step-Down Li+ Battery Charger22 ______________________________________________________________________________________point, LVC, to t

Pagina 16

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 23effectively cut

Pagina 17

MAX1870AStep-Up/Step-Down Li+ Battery Charger24 ______________________________________________________________________________________Setting the LTF

Pagina 18

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 25loop (CCS) is in

Pagina 19

MAX1870AStep-Up/Step-Down Li+ Battery Charger26 ______________________________________________________________________________________LDO provides a 5

Pagina 20

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 27MOSFET Power Dis

Pagina 21

MAX1870AStep-Up/Step-Down Li+ Battery Charger28 ______________________________________________________________________________________CON) are preferr

Pagina 22

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 29Layout And Bypas

Pagina 23

MAX1870AStep-Up/Step-Down Li+ Battery Charger_______________________________________________________________________________________ 3PARAMETER CONDIT

Pagina 24

MAX1870AStep-Up/Step-Down Li+ Battery Charger30 ______________________________________________________________________________________3231302928272691

Pagina 25

MAX1870AStep-Up/Step-Down Li+ Battery Charger______________________________________________________________________________________ 31Package Informat

Pagina 26

Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outl

Pagina 27

MAX1870AStep-Up/Step-Down Li+ Battery Charger4 _______________________________________________________________________________________PARAMETER CONDIT

Pagina 28

MAX1870AStep-Up/Step-Down Li+ Battery Charger_______________________________________________________________________________________ 5PARAMETER CONDIT

Pagina 29

MAX1870AStep-Up/Step-Down Li+ Battery Charger6 _______________________________________________________________________________________PARAMETER CONDIT

Pagina 30

MAX1870AStep-Up/Step-Down Li+ Battery Charger_______________________________________________________________________________________ 7PARAMETER CONDIT

Pagina 31 - Package Information

MAX1870AStep-Up/Step-Down Li+ Battery Charger8 _______________________________________________________________________________________PARAMETER CONDIT

Pagina 32

MAX1870AStep-Up/Step-Down Li+ Battery Charger_______________________________________________________________________________________ 9BATTERY INSERTIO

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