Rainbow-electronics MAX1730 Manual de usuario descargar pdf

General Description

The MAX1730 regulated step-down charge pump gen-

erates up to 50mA at fixed output voltages of 1.8V or

1.9V from an input voltage in the 2.7V to 5.5V range.

Specifically designed to provide high-efficiency logic

supplies in applications that demand a compact

design, the MAX1730 employs fractional conversion

techniques to provide efficiency exceeding that of a lin-

ear regulator.

The MAX1730 operates at up to 2MHz, permitting the

use of small 0.22µF flying capacitors while maintaining

low 75µA quiescent supply current. Proprietary soft-

start circuitry prevents excessive current from being

drawn from the supply during startup, making the

MAX1730 compatible with higher impedance sources

such as alkaline and lithium-ion cells.

The MAX1730 is available in a space-saving 10-pin

µMAX package that is only 1.09mm high and occupies

one-half the area of an 8-pin SO.

Applications

Low-Voltage Logic Supplies

Wireless Handsets

PDAs

PC Cards

Hand-Held Instruments

Features

♦ > 85% Peak Efficiency

♦ 50mA Guaranteed Output Current

♦ Dual-Mode 1.8V or 1.9V Output

♦ ±3% Output Voltage Accuracy

♦ Up to 2MHz Operating Frequency

♦ Small 0.22µF Capacitors

♦ No Inductor Required

♦ 2.7V to 5.5V Input Voltage Range

♦ Output Disconnects from Input in Shutdown Mode

♦ Small 10-Pin µMAX Package (1.09mm max height)

MAX1730

50mA Regulated Step-Down Charge Pump

for 1.8V or 1.9V Logic

________________________________________________________________ Maxim Integrated Products 1

OUT

C2P

C2NC1N

C1P

SHDN

MAX1730

µMAX

TOP VIEW

PGNDGND

0.22µF

MAX1730

OUT

C2P

C2N

PGND

0.22µF

4.7µF

1µF

GND

C1P

C1N

OUTPUT

1.8V OR 1.9V, UP TO 50mA

INPUT

2.7V TO 5.5V

SHDN

Typical Operating Circuit

19-1618; Rev 0; 4/00

PART

MAX1730EUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

Pin Configuration

Ordering Information

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.

1 2 3 4 5 6 7 8

Indice de contenidos

Pagina 1 - TOP VIEW

General DescriptionThe MAX1730 regulated step-down charge pump gen-erates up to 50mA at fixed output voltages of 1.8V or1.9V from an input voltage in

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic2 ___________________________________________________________________________________

Pagina 3

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic_____________________________________________________________________________________

Pagina 4

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic4 ___________________________________________________________________________________

Pagina 5 - Pin Description

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic_____________________________________________________________________________________

Pagina 6 - Functional Diagram

MAX1730Detailed DescriptionThe MAX1730 step-down charge pump automaticallyswitches between charge pump configurations (Figures1, 2, and 3) and utilize

Pagina 7 - Applications Information

To maximize efficiency, the MAX1730 automaticallyswitches between charge-pump configurations (Figures1, 2, and 3). Efficiency is greatest when the IN/

Pagina 8 - Package Information

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V LogicMaxim cannot assume responsibility for use of any circuitry other than circuitry enti

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Rainbow-electronics MAX1730 Manual de usuario

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