Rainbow-electronics MAX1724 Bedienungsanleitung PDF herunterladen

General Description

The MAX1722/MAX1723/MAX1724 compact, high-effi-

ciency, step-up DC-DC converters are available in tiny, 5-

pin thin SOT23 packages. They feature an extremely low

1.5µA quiescent supply current to ensure the highest pos-

sible light-load efficiency. Optimized for operation from

one to two alkaline or nickel-metal-hydride (NiMH) cells, or

a single Li+ cell, these devices are ideal for applications

where extremely low quiescent current and ultra-small size

are critical.

Built-in synchronous rectification significantly improves

efficiency and reduces size and cost by eliminating the

need for an external Schottky diode. All three devices fea-

ture a 0.5Ω N-channel power switch. The MAX1722/

MAX1724 also feature proprietary noise-reduction circuitry,

which suppresses electromagnetic interference (EMI)

caused by the inductor in many step-up applications. The

family offers different combinations of fixed or adjustable

outputs, shutdown, and EMI reduction (see Selector

Guide).

Applications

Features

♦ Up to 90% Efficiency

♦ No External Diode or FETs Needed

♦ 1.5µA Quiescent Supply Current

♦ 0.1µA Logic-Controlled Shutdown

♦ ±1% Output Voltage Accuracy

♦ Fixed Output Voltage (MAX1724) or Adjustable

Output Voltage (MAX1722/MAX1723)

♦ Up to 150mA Output Current

♦ 0.8V to 5.5V Input Voltage Range

♦ 0.91V Guaranteed Startup (MAX1722/MAX1724)

♦ Internal EMI Suppression (MAX1722/MAX1724)

♦ Thin SOT23-5 Package (1.1mm max Height)

MAX1722/MAX1723/MAX1724

1.5µA I

, Step-Up DC-DC Converters

in Thin SOT23-5

________________________________________________________________ Maxim Integrated Products 1

GND

OUTFB

15LXBATT

MAX1722

THIN SOT23-5

TOP VIEW

OUT

0.8V TO 5.5V

3.3V AT

UP TO 150mA

OFF

BATT

MAX1724

SHDN

GND

10µH

OUT

Typical Operating Circuit

19-1735; Rev 0; 7/01

Ordering Information

Selector Guide

Pagers

Remote Controls

Remote Wireless

Transmitters

Personal

Medical Devices

Digital Still Cameras

Single-Cell Battery-

Powered Devices

Low-Power Hand-Held

Instruments

MP3 Players

Personal Digital

Assistants (PDA)

Pin Configurations are continued at end of data sheet.

PART

MAX1722EZK

MAX1723EZK

MAX1724EZK27 Fixed 2.7

Adjustable

OUTPUT (V)

SHDN

Yes

MAX1724EZK30

MAX1724EZK33

MAX1724EZK50 Fixed 5.0

Fixed 3.3

Fixed 3.0 Yes

Yes

DAMPING

Yes

ADQK

ADQJ

ADQI

ADQH

ADQG

ADQF

TOP

MARK

5 SOT23

5 SOT23-40°C to +85°C

-40°C to +85°C

MAX1724EZK50-T

MAX1724EZK33-T

MAX1724EZK30-T

5 SOT23

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

MAX1724EZK27-T

MAX1723EZK-T

MAX1722EZK-T

PART

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.

Pin Configurations

1 2 3 4 5 6 ... 11 12

Inhaltsverzeichnis

Seite 1 - , Step-Up DC-DC Converters

General DescriptionThe MAX1722/MAX1723/MAX1724 compact, high-effi-ciency, step-up DC-DC converters are available in tiny, 5-pin thin SOT23 packages. T

Seite 2

For most applications, the peak inductor current equalsthe current limit. However, for applications using largeinductor values or low input voltages,

Seite 3