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General Description

The MAX1795/MAX1796/MAX1797 are high efficiency

step-up DC-DC converters intended for small portable

hand-held devices. These devices feature Maxim’s

True-Shutdown™ circuitry, which fully disconnects the

output from the input in shutdown, improves efficiency,

and eliminates costly external components. All three

devices also feature Maxim’s proprietary LX-damping

circuitry for reduced EMI in noise-sensitive applica-

tions. For additional in-system flexibility, a battery moni-

toring comparator (LBI/LBO) remains active even when

the DC-DC converter is in shutdown.

The input voltage range is +0.7V to V

OUT

, where V

OUT

can be set from +2V to +5.5V. Startup is guaranteed

from +0.85V. The MAX1795/MAX1796/MAX1797 have a

preset, pin-selectable 5V or 3.3V output. The output

can also be adjusted to other voltages, using two exter-

nal resistors. The three devices differ only in their cur-

rent limits, allowing optimization of external components

for different loads: The MAX1795, MAX1796, and

MAX1797 have current limits of 0.25A, 0.5A, and 1A,

respectively. All devices are packaged in a compact 8-

pin µMAX package that is only 1.09mm tall and half the

size of an 8-pin SO.

________________________Applications

Portable Digital Audio Players

PDAs/Palmtops

Wireless Handsets

Portable Terminals

Features

♦ >95% Efficiency

♦ True-Shutdown Circuitry

Output Disconnects from Input in Shutdown

No External Schottky Diode Needed

♦ 25µA Quiescent Supply Current

♦ Low-Noise Antiringing Feature

♦ LBI/LBO Comparator Enabled in Shutdown

♦ 2µA Shutdown Current

♦ 8-Pin µMAX Package

MAX1795/MAX1796/MAX1797

Low Supply Current, Step-Up DC-DC Converters

with True-Shutdown

________________________________________________________________ Maxim Integrated Products 1

BATT

OUT

GND

LBO

LBI

MAX1795

MAX1796

MAX1797

µMAX

TOP VIEW

SHDN

Pin Configuration

GND

LBI

LBO

BATT

OUT

MAX1795

MAX1796

MAX1797

SHDN

OUT

0.7V TO

5.5V

OFF

Typical Operating Circuit

19-1798; Rev 0; 12/00

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1795

EUA -40°C to +85°C 8 µMAX

MAX1796 EUA -40°C to +85°C 8 µMAX

MAX1797 EUA -40°C to +85°C 8 µMAX

True-Shutdown is a trademark of Maxim Integrated Products.

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

1 2 3 4 5 6 ... 12 13

MAX1795/MAX1796/MAX1797 1

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Página 1 - MAX1795/MAX1796/MAX1797

General DescriptionThe MAX1795/MAX1796/MAX1797 are high efficiencystep-up DC-DC converters intended for small portablehand-held devices. These devices

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MAX1795/MAX1796/MAX1797pate this energy, minimizing the ringing at LX.Damping LX ringing does not reduce VOUTripple, butdoes reduce EMI (Figures 3, 4,

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VTRIPis the input voltage where the low-battery detec-tor output goes high impedance. For single-cell applications, LBI may be connected tothe battery

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown12 ______________________________________________________________

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Package Information8LUMAXD.EPSMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. N

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown2 _______________________________________________________________

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown_________________________________________________________________

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown4 _______________________________________________________________

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown_________________________________________________________________

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown6 _______________________________________________________________

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MAX1795/MAX1796/MAX1797Low Supply Current, Step-Up DC-DC Converterswith True-Shutdown_________________________________________________________________

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MAX1795/MAX1796/MAX1797Detailed DescriptionThe MAX1795/MAX1796/MAX1797 compact step-upDC-DC converters start up with voltages as low as0.85V and opera

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Synchronous RectificationThe internal synchronous rectifier eliminates the needfor an external Schottky diode, reducing cost andboard space. During th

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Rainbow-electronics MAX1797 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX1797. Rainbow Electronics MAX1797 User Manual Manual do Utilizador

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