Rainbow-electronics MAX1760 Bedienungsanleitung PDF herunterladen

General Description

The MAX1760 is a high-efficiency, low-noise, step-up

DC-DC converter intended for use in battery-powered

wireless applications. It maintains exceptionally low qui-

escent supply current (100µA) despite its high 1MHz

operating frequency. Small external components and a

tiny 10-pin µMAX package make this device an excel-

lent choice for small hand-held applications requiring

the longest possible battery life.

The MAX1760 uses a synchronous-rectified pulse-

width-modulation (PWM) boost topology to generate

2.5V to 5.5V outputs from a wide range of input

sources, such as 1 to 3 alkaline or NiCd/NiMH cells or a

single lithium-ion (Li+) cell. Maxim's proprietary Idle-

Mode™ circuitry significantly improves efficiency at

light load currents while smoothly transitioning to fixed-

frequency PWM operation at higher load currents to

maintain excellent full-load efficiency.

Low-noise, forced PWM mode is available for applica-

tions requiring constant-frequency operation at all load

currents. The MAX1760 may also be synchronized to

an external clock to protect sensitive frequency bands

in communications equipment. Analog soft-start and

adjustable current limit permit optimization of efficiency,

external component size, and output voltage ripple.

Applications

Digital Cordless Phones PCS Phones

Wireless Handsets Hand-Held Instruments

Palmtop Computers Personal Communicators

Two-Way Pagers

Features

♦ Up to 94% Efficiency

♦ 0.7V to 5.5V Input Range

♦ Up to 800mA Output

♦ Fixed 3.3V Output (or adj from 2.5V to 5.5V)

♦ PWM Synchronous Rectified Topology

♦ Low-Noise, Constant Frequency Operation (1MHz)

♦ 0.1µA Logic-Controlled Shutdown

♦ Synchronizable Switching Frequency

♦ Adjustable Current Limit

♦ Adjustable Soft-Start

♦ 10-Pin µMAX Package

MAX1760

0.8A, Low-Noise, 1MHz,

Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

POUT

PGNDFB

GND

REF

ISET

MAX1760

µMAX

TOP VIEW

CLK/SELOUT

PGND

FB GND

POUT

ISET

OUT

REF

CLK/SEL

INPUT = 0.7V

TO V

OUT

= 3.3V,

800mA

MAX1760

Typical Operating Circuit

19-1660; Rev 1; 1/01

PART

MAX1760EUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

EVALUATION KIT

AVAILABLE

Idle Mode is a trademark of Maxim Integrated Products.

Pin Configuration

Ordering Information

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.

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Inhaltsverzeichnis

Seite 1 - Step-Up DC-DC Converter

General DescriptionThe MAX1760 is a high-efficiency, low-noise, step-upDC-DC converter intended for use in battery-poweredwireless applications. It ma

Seite 2

MAX1760time constant is:where RSS≥ 470k. Placing a capacitor across the lower resistor of the cur-rent-limiting resistive divider provides both curren

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age, and output capacitors with working voltage ratingshigher than the output. The input filter capacitor reduces peak currents drawnfrom the input so

Seite 4

MAX17600.8A, Low-Noise, 1MHz, Step-Up DC-DC ConverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodie

Seite 5

MAX17600.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter2 _______________________________________________________________________________________ABSOLUTE

Seite 6

MAX17600.8A, Low-Noise, 1MHz,Step-Up DC-DC Converter_______________________________________________________________________________________ 3ELECTRICA

Seite 7

MAX17600.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter4 _______________________________________________________________________________________Note 1:

Seite 8

MAX17600.8A, Low-Noise, 1MHz,Step-Up DC-DC Converter_______________________________________________________________________________________ 5NO-LOAD B

Seite 9 - ( )

MAX17600.8A, Low-Noise, 1MHz,Step-Up DC-DC Converter6 _______________________________________________________________________________________NOISE SPE

Seite 10

MAX17600.8A, Low-Noise, 1MHz,Step-Up DC-DC Converter_______________________________________________________________________________________ 7Detailed

Seite 11

MAX17600.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter8 _______________________________________________________________________________________output f

Seite 12

ReferenceThe MAX1760 has an internal 1.250V ±1% reference.Connect a 0.22µF ceramic bypass capacitor from REFto GND within 0.2in (5mm) of the REF pin.

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Rainbow-electronics MAX1760 Bedienungsanleitung

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Inhaltsverzeichnis

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