MAX1797EUA+T

更新时间： 2024-01-01 17:52:25

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美信 - MAXIM		转换器
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MAX1797EUA+T 数据手册

19-1798; Rev 0; 12/00

Low Supply Current, Step-Up DC-DC Converters

with True-Shutdown

General Description

Features

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.

o >95% Efficiency

o True-Shutdown Circuitry

Output Disconnects from Input in Shutdown

No External Schottky Diode Needed

o 25µA Quiescent Supply Current

o Low-Noise Antiringing Feature

o LBI/LBO Comparator Enabled in Shutdown

o 2µA Shutdown Current

The input voltage range is +0.7V to V

, where V

OUT

o 8-Pin µMAX Package

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.

Ordering Information

PART

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

8 µMAX

MAX1795EUA

MAX1796EUA

MAX1797EUA

8 µMAX

________________________Applications

True-Shutdown is a trademark of Maxim Integrated Products.

Portable Digital Audio Players

PDAs/Palmtops

Wireless Handsets

Portable Terminals

Pin Configuration

Typical Operating Circuit

0.7V TO

5.5V

TOP VIEW

BATT

LBI

BATT

OUT

MAX1795

MAX1796

MAX1797

MAX1795

MAX1796

MAX1797

OUT

LBO

LBI

GND

SHDN

LBO

OFF

µMAX

SHDN

GND

________________________________________________________________ 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.

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