Rainbow-electronics MAX1676 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX1674/MAX1675/MAX1676 compact, high-effi-

ciency, step-up DC-DC converters fit in small µMAX

packages. They feature a built-in synchronous rectifier,

which improves efficiency and reduces size and cost

by eliminating the need for an external Schottky diode.

Quiescent supply current is only 16µA.

The input voltage ranges from 0.7V to V

OUT

, where

OUT

can be set from 2V to 5.5V. Start-up is guaran-

teed from 1.1V inputs. The MAX1674/MAX1675/

MAX1676 have a preset, pin-selectable output for 5V or

3.3V. The outputs can also be adjusted to other volt-

ages using two external resistors.

All three devices have a 0.3Ω N-channel MOSFET

power switch. The MAX1674 has a 1A current limit. The

MAX1675 has a 0.5A current limit, which permits the

use of a smaller inductor. The MAX1676 comes in a

10-pin µMAX package and features an adjustable cur-

rent limit and circuitry to reduce inductor ringing.

________________________Applications

Pagers

Wireless Phones

Medical Devices

Hand-Held Computers

PDAs

RF Tags

1 to 3-Cell Hand-Held Devices

____________________________Features

♦ 94% Efficient at 200mA Output Current

♦ 16µA Quiescent Supply Current

♦ Internal Synchronous Rectifier (no external diode)

♦ 0.1µA Logic-Controlled Shutdown

♦ LBI/LBO Low-Battery Detector

♦ Selectable Current Limit for Reduced Ripple

♦ Low-Noise, Anti-Ringing Feature (MAX1676)

♦ 8-Pin and 10-Pin µMAX Packages

♦ Preassembled Evaluation Kit (MAX1676EVKIT)

MAX1674/MAX1675/MAX1676

High-Efficiency, Low-Supply-Current,

Compact, Step-Up DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

GNDLBO

SHDN

REF

OUT

LXLBI

MAX1674

MAX1675

µMAX

TOP VIEW

OUT

GND

BATTCLSEL

LBO

LBI

MAX1676

µMAX

SHDNREF

MAX1674

MAX1675

INPUT

0.7V TO V

OUT

SHDN

LBO

OUT

LBI

0.1µF

LOW-BATTERY

DETECT OUT

OFF

REF

GND

OUTPUT

3.3V, 5V, OR

ADJ (2V TO 5.5V)

UP TO 300mA

LOW-BATTERY

DETECT IN

PART

MAX1674EUA

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 µMAX

_______________Ordering Information

MAX1675EUA

-40°C to +85°C 8 µMAX

MAX1676EUB

-40°C to +85°C 10 µMAX

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Typical Operating Circuit

Pin Configurations

19-1360; Rev 3; 3/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

1 2 3 4 5 6 ... 11 12

MAX1674/MAX1675/MAX1676 1

Inhaltsverzeichnis

Seite 1 - MAX1674/MAX1675/MAX1676

General DescriptionThe MAX1674/MAX1675/MAX1676 compact, high-effi-ciency, step-up DC-DC converters fit in small µMAXpackages. They feature a built-in

Seite 2

MAX1674/MAX1675/MAX1676LBI and LBO. For VTRIPless than 1.3V, configure thecomparator as shown in Figure 8. Calculate the value ofthe external resistor

Seite 3

Capacitor SelectionA 47µF, 10V surface-mount tantalum (SMT) output filtercapacitor provides 80mV output ripple when steppingup from 2V to 5V. Smaller

Seite 4

MAX1674/MAX1675/MAX1676High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters12 ______________________________________________________

Seite 5

MAX1674/MAX1675/MAX1676High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters2 _______________________________________________________

Seite 6

MAX1674/MAX1675/MAX1676High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters_________________________________________________________

Seite 7

MAX1674/MAX1675/MAX1676High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters4 _______________________________________________________

Seite 8

MAX1674/MAX1675/MAX1676High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters_________________________________________________________

Seite 9

10µs/divLINE-TRANSIENT RESPONSEMAX1674 TOC15VIN2V TO 3V1V/divVOUTAC COUPLED100mV/divILOAD100mA5µs/divLOAD-TRANSIENT RESPONSEMAX1674 TOC16IOUT200mA/div

Seite 10

Detailed DescriptionThe MAX1674/MAX1675/MAX1676 compact, step-upDC-DC converters start up with voltages as low as 0.9Vand operate with an input voltag

Seite 11

MAX1674/MAX1675/MAX1676As a result, the synchronous rectifier significantlyimproves efficiency without the addition of an externalcomponent. Conversio

Seite 12

Selecting the Output VoltageVOUTcan be set to 3.3V or 5.0V by connecting the FBpin to GND (5V) or OUT (3.3V) (Figures 5 and 6).To adjust the output vo

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Rainbow-electronics MAX1676 Bedienungsanleitung Seite 1

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Sensoren Rainbow-electronics MAX1676 herunter. Rainbow Electronics MAX1676 User Manual Benutzerhandbuch

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Rainbow-electronics MAX1676 Bedienungsanleitung Seite 1

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Sensoren Rainbow-electronics MAX1676 herunter. Rainbow Electronics MAX1676 User Manual Benutzerhandbuch

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