Rainbow-electronics MAX6781 Instrukcja Użytkownika Pobierz pdf (Strona 1)

General Description

The MAX6775–MAX6781 low-power, 1%-accurate bat-

tery monitors are available in the ultra-small µDFN

package (1.0mm x 1.5mm) and SC70 packages. These

low-power devices are ideal for monitoring single lithi-

um-ion (Li+) cells, or multicell alkaline/NiCd/NiMH

power sources. These devices offer single (MAX6775/

MAX6776/MAX6777/MAX6778) or dual (MAX6779/

MAX6780/MAX6781) low-battery outputs and feature

fixed or resistor-adjustable hysteresis. Hysteresis elimi-

nates the output chatter sometimes associated with bat-

tery voltage monitors, usually due to input-voltage noise

or battery terminal voltage recovery after load removal.

These devices are available in several versions: with

single- or dual-voltage monitors, and with fixed or

adjustable hysteresis. The MAX6775/MAX6776 offer a

single battery monitor and factory-set hysteresis of

0.5%, 5%, or 10%. The MAX6779/MAX6780/MAX6781

have two battery monitors in a single package and fac-

tory-set hysteresis of 0.5%, 5%, or 10%. The MAX6777/

MAX6778 offer a single battery monitor with external

inputs for the rising and falling thresholds, allowing

external hysteresis control.

For convenient interface with system power circuitry or

microprocessors, both open-drain and push-pull out-

puts are available. The single-channel devices are

available with open-drain or push-pull outputs. The

dual-channel devices are available with both outputs

open-drain, both outputs push-pull, or one of each

(see the Selector Guide). This family of devices is

offered in small 5-pin SC70 and ultra-small 6-pin µDFN

packages, and is fully specified over the -40°C to

+85°C extended temperature range.

Applications

Battery-Powered Systems (Single-Cell Li+ or

Multicell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Pagers

Portable Medical Devices

PDAs

Electronic Toys

MP3 Players

Features

♦ 1.0%-Accurate Threshold Specified Over

Temperature

♦ Single/Dual, Low-Battery Output Options

♦ Low 3µA Battery Current

♦ Open-Drain or Push-Pull Low-Battery Outputs

♦ Fixed or Adjustable Hysteresis

♦ Low-Input Leakage Current Allows Use of Large

Resistors

♦ Guaranteed Valid Low-Battery-Output Logic State

Down to V

BATT

= 1V

♦ Immune to Short Battery Transients

♦ Fully Specified from -40°C to +85°C

♦ Small 5-Pin SC70 or Ultra-Small 6-Pin µDFN

(1mm x 1.5mm) Package

MAX6775–MAX6781

Low-Power, 1%-Accurate Battery

Monitor in µDFN and SC70 Packages

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

LBI

3.6V

LBO

BATT

MAX6775

SHDN OUT

DC-DC

CONVERTER

Typical Operating Circuit

19-3774; Rev 0; 8/05

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.

Ordering Information continued at end of data sheet.

+Denotes lead-free package.

*Future product—contact factory for availability.

MAX6775/MAX6776/MAX6779/MAX6780/MAX6781 are available

with factory-trimmed hysteresis. Specify trim by replacing “_”

with “A” for 0.5%, “B” for 5%, or “C” for 10% hysteresis.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX6775XK_+T -40°C to +85°C 5 SC70-5

MAX6775LT_+T* -40°C to +85°C 6 µDFN-6

MAX6776XK_+T* -40°C to +85°C 5 SC70-5

MAX6776LT_+T* -40°C to +85°C 6 µDFN-6

MAX6777XK+T -40°C to +85°C 5 SC70-5

MAX6777LT+T* -40°C to +85°C 6 µDFN-6

1 2 3 4 5 6 ... 11 12

MAX6775–MAX6781 1

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Strona 1 - MAX6775–MAX6781

General DescriptionThe MAX6775–MAX6781 low-power, 1%-accurate bat-tery monitors are available in the ultra-small µDFNpackage (1.0mm x 1.5mm) and SC70

Strona 2

MAX6775–MAX6781Low-Power, 1%-Accurate BatteryMonitor in µDFN and SC70 Packages10 _____________________________________________________________________

Strona 3