Rainbow-electronics MAX1734 Manual do Utilizador descarregar pdf

General Description

The MAX1733/MAX1734 step-down DC-DC converters

deliver over 250mA to outputs as low as 1.25V. These

converters use a unique proprietary current-limited con-

trol scheme that achieves over 90% efficiency. These

devices maintain extremely low quiescent supply cur-

rent (40µA), and their high 1.2MHz (max) operating fre-

quency permits small, low-cost external components.

This combination of features makes the MAX1733/

MAX1734 excellent high-efficiency alternatives to linear

regulators in space-constrained applications.

Internal synchronous rectification greatly improves effi-

ciency and eliminates the external Schottky diode

required in conventional step-down converters. Both

devices also include internal digital soft-start to limit

input current upon startup and reduce input capacitor

requirements.

The MAX1733 provides an adjustable output voltage

(1.25V to 2.0V). The MAX1734 provides factory-preset

output voltages (see Selector Guide). Both are avail-

able in space-saving 5-pin SOT23 packages.

Applications

Cellular, PCS, and Cordless Telephones

PDAs, Palmtops, and Handy-Terminals

Battery-Powered Equipment

Features

♦ 250mA Guaranteed Output Current

♦ Synchronous Rectifier for Over 90% Efficiency

♦ Tiny 5-Pin SOT23 Package

♦ 40µA Quiescent Supply Current

♦ 0.01µA Logic-Controlled Shutdown

♦ Up to 1.2MHz Switching Frequency

♦ Fixed 1.8V or 1.5V Outputs (MAX1734)

♦ Adjustable Output Voltage (MAX1733)

♦ ±1.5% Initial Accuracy

♦ 2.7V to 5.5V Input Range

♦ Soft-Start Limits Startup Current

MAX1733/MAX1734

Low-Voltage, Step-Down DC-DC Converters

in SOT23

________________________________________________________________ Maxim Integrated Products 1

GND

OUT (FB)

( ) ARE FOR MAX1733 ONLY.

SHDN

15LXIN

MAX1733

MAX1734

SOT23-5

TOP VIEW

Pin Configuration

OUT

250mA

INPUT

+2.7V TO +5.5V

MAX1734

SHDN

GND

10µH

22µF

2.2µF

Typical Operating Circuit

19-1586; Rev 0; 7/00

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.

Note: The MAX1734 offers two output voltages. See the Selector

Guide, then insert the proper designator into the blanks above to

complete the part number.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1733EUK-T -40°C to +85°C 5 SOT23-5

M A X1 7 3 4 E U K_ _- T -40°C to +85°C 5 SOT23-5

Selector Guide

PART V

OUT

(V) TOP MARK

MAX1733EUK Adjustable ADKY

MAX1734EUK18 1.8 ADKW

MAX1734EUK15 1.5 ADKX

1 2 3 4 5 6 7 8

MAX1733/MAX1734 1

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Página 1 - MAX1733/MAX1734

General DescriptionThe MAX1733/MAX1734 step-down DC-DC convertersdeliver over 250mA to outputs as low as 1.25V. Theseconverters use a unique proprieta

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MAX1733/MAX1734Low-Voltage, Step-Down DC-DC Convertersin SOT232 ______________________________________________________________________________________

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MAX1733/MAX1734Low-Voltage, Step-Down DC-DC Convertersin SOT23_______________________________________________________________________________________

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MAX1733/MAX1734Low-Voltage, Step-Down DC-DC Convertersin SOT234 ______________________________________________________________________________________

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MAX1733/MAX1734Low-Voltage, Step-Down DC-DC Convertersin SOT23_______________________________________________________________________________________

Página 6

MAX1733/MAX1734Detailed DescriptionThe MAX1733/MAX1734 step-down DC-DC convertersdeliver over 250mA to outputs as low as 1.25V. Theyuse a unique propr

Página 7

GND (Figure 1). Choose R2 to be less than 50kΩ:where VREF= 1.25V.Inductor SelectionThe MAX1733/MAX1734 are optimized to use a 10µHinductor over the en

Página 8

MAX1733/MAX1734Low-Voltage, Step-Down DC-DC Convertersin SOT23Maxim cannot assume responsibility for use of any circuitry other than circuitry entirel

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Rainbow-electronics MAX1734 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX1734. Rainbow Electronics MAX1734 User Manual Manual do Utilizador

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