MAX1795 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX1795

Low-Supply Current, Step-Up DC-DC Converters with True Shutdown

Maxim Integrated 

MAX1795/MAX1796/

MAX1797

Low-Supply Current, Step-Up DC-DC Converters

with True Shutdown

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 out-

put 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 applications.

For additional in-system flexibility, a battery monitoring

comparator (LBI/LBO) remains active even when the

DC-DC converter is in shutdown.

The input voltage range is +0.7V to VOUT, where VOUT

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 external

resistors. The three devices differ only in their current

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

Pin Configuration

TOP VIEW

LBI 1

FB 2

LBO 3

SHDN 4

MAX1795

MAX1796

MAX1797

µMAX

8 BATT

7 OUT

6 LX

5 GND

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

Ordering Information

PART

MAX1795EUA

MAX1796EUA

MAX1797EUA

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

8 μMAX

8 μMAX

8 μMAX

Typical Operating Circuit

IN

0.7V TO

5.5V

BATT

LX

LBI

MAX1795

MAX1796

OUT

OUT

MAX1797 FB

LBO

OFF

SHDN

ON

GND

True Shutdown is a trademark of Maxim Integrated Products.

19-1798; Rev 0; 12/00

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