Rainbow-electronics MAX8730 User Manual download pdf

MAX8730

Low-Cost Battery Charger

________________________________________________________________ Maxim Integrated Products 1

19-3885; Rev 0; 12/05

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

General Description

The MAX8730 highly integrated, multichemistry, battery-

charger control IC simplifies construction of accurate

and efficient chargers. The MAX8730 operates at high

switching frequency to minimize external component

size and cost. The MAX8730 uses analog inputs to con-

trol charge current and voltage, and can be pro-

grammed by a microcontroller or hardwired.

The MAX8730 reduces charge current to give priority to

the system load, effectively limiting the adapter current

and reducing the adapter current requirements.

The MAX8730 provides a digital output that indicates

the presence of an AC adapter, and an analog output

that monitors the current drawn from the AC adapter.

Based on the presence and absence of the AC

adapter, the MAX8730 automatically selects the appro-

priate source for supplying power to the system by con-

trolling two external switches. Under system control, the

MAX8730 allows the battery to undergo a relearning

cycle in which the battery is completely discharged

through the system load and then recharged.

An analog output indicates adapter current or battery-

discharge current. The MAX8730 provides a low-quies-

cent-current linear regulator, which may be used when

the adapter is absent, or disabled for reduced current

consumption

The MAX8730 is available in a small, 5mm x 5mm, 28-

pin, thin (0.8mm) QFN package. An evaluation kit is

available to reduce design time. The MAX8730 is

available in a lead-free package.

Applications

Notebook Computers

Tablet PCs

Portable Equipment with Rechargeable Batteries

Features

♦ Small Inductor (3.5µH)

♦ Programmable Charge Current > 4.5A

♦ Automatic Power-Source Selection

♦ Analog Inputs Control Charge Current and

Charge Voltage

♦ Monitor Outputs for

AC Adapter Current

Battery-Discharge Current

AC Adapter Presence

♦ Independent 3.3V 20mA Linear Regulator

♦ Up to 17.6V (max) Battery Voltage

♦ +8V to +28V Input Voltage Range

♦ Reverse Adapter Protection

♦ System Short-Circuit Protection

♦ Cycle-by-Cycle Current Limit

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX8730ETI+

-40°C to +85°C

28 Thin QFN

(5mm x 5mm)

T2855-5

+Denotes lead-free package.

Pin Configuration appears at end of data sheet.

MAX8730

ADAPTER

INPUT

PDS

SRC

ASNS

ACIN

ACOK

VCTL

LDO

CLS

ICTL

MODE

REFON

INPON

LDO

RELTH

REF

SWREF

BATT

CSIN

CSIP

DHI

PDL

DHIV

IINP CCV

CCI

CCS

CSSP CSSN

GND

REF

HOST

SYSTEM

LOAD

BATTERY

Typical Operating Circuit

1 2 3 4 5 6 ... 28 29

Low-Cost Battery Charger 1

Summary of Contents

Page 1 - Low-Cost Battery Charger

MAX8730Low-Cost Battery Charger________________________________________________________________ Maxim Integrated Products 119-3885; Rev 0; 12/05For pr

Page 2

MAX8730Low-Cost Battery Charger10 ______________________________________________________________________________________Typical Operating Characterist

Page 3

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 11OUTPUT RIPPLE VOLTAGEvs. BATTE

Page 4

MAX8730Low-Cost Battery Charger12 ______________________________________________________________________________________Typical Operating Characterist

Page 5

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 13LDO LINE REGULATIONINPUT VOLTA

Page 6

MAX8730Low-Cost Battery Charger14 ______________________________________________________________________________________PINNAMEFUNCTION 1 ASNS Adapter

Page 7

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 15MAX8730ADAPTERINPUTRS115mΩC210

Page 8

MAX8730Low-Cost Battery Charger16 ______________________________________________________________________________________Detailed DescriptionThe MAX873

Page 9

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 17NMAX8730A = 20V/VCSSNCSSPCURRE

Page 10

MAX8730Low-Cost Battery Charger18 ______________________________________________________________________________________The MAX8730 includes a foldbac

Page 11

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 19reaches 100% depth of discharg

Page 12

MAX8730Low-Cost Battery Charger2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTR

Page 13

MAX8730Low-Cost Battery Charger20 ______________________________________________________________________________________CCV, CCI, CCS, and LVC Control

Page 14

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 21NAME EQUATION DESCRIPTIONCCV p

Page 15

MAX8730Low-Cost Battery Charger22 ______________________________________________________________________________________where:VBATT = 16.8VGMV = 0.125

Page 16

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 23CCS Loop CompensationThe simpl

Page 17

MAX8730Low-Cost Battery Charger24 ______________________________________________________________________________________MOSFET DriversThe DHI output i

Page 18

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 25where θJAis the thermal resist

Page 19

MAX8730Low-Cost Battery Charger26 ______________________________________________________________________________________Output Capacitor SelectionThe

Page 20

MAX8730Low-Cost Battery Charger______________________________________________________________________________________ 27For typical applications, choo

Page 21

MAX8730Low-Cost Battery Charger28 ______________________________________________________________________________________Chip InformationTRANSISTOR COU

Page 22

MAX8730Low-Cost Battery ChargerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.

Page 23

MAX8730Low-Cost Battery Charger_______________________________________________________________________________________ 3ELECTRICAL CHARACTERISTICS (co

Page 24

MAX8730Low-Cost Battery Charger4 _______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (co

Page 25

MAX8730Low-Cost Battery Charger_______________________________________________________________________________________ 5ELECTRICAL CHARACTERISTICS (co

Page 26

MAX8730Low-Cost Battery Charger6 _______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (co

Page 27

MAX8730Low-Cost Battery Charger_______________________________________________________________________________________ 7PARAMETERSYMBOLCONDITIONS MIN

Page 28

MAX8730Low-Cost Battery Charger8 _______________________________________________________________________________________PARAMETERSYMBOLCONDITIONS MIN

Page 29

MAX8730Low-Cost Battery Charger_______________________________________________________________________________________ 9Note 1: Accuracy does not incl

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