Rainbow-electronics MAX1673 Manual de usuario descargar pdf

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

________________General Description

The MAX1673 charge-pump inverter provides a low-

cost, compact means of generating a regulated nega-

tive output from a positive input at up to 125mA. It

requires only three small capacitors, and only two resis-

tors to set its output voltage. The input range is 2V to

5.5V. The regulated output can be set from 0V to -V

Skip regulation mode or -1.5V to -V

in Linear (LIN)

regulation mode.

In Skip mode, the MAX1673 regulates by varying its

switching frequency as a function of load current. This

On-Demand™ switching gives the MAX1673 two

advantages: very small capacitors and very low quies-

cent supply current. At heavy loads, it transfers energy

from the input to the output by switching at up to

350kHz. It switches more slowly at light loads, using

only 35µA quiescent supply current.

In Linear mode, the MAX1673 switches at a constant

350kHz at all loads and regulates by controlling

the current-path resistance. This provides constant-

frequency ripple, which is easily filtered for low-noise

applications.

This device also features a 1µA logic-controlled shut-

down mode and is available in a standard 8-pin SO

package. For a device that delivers about 10mA and

fits in a smaller package, refer to the MAX868.

________________________Applications

Hard Disk Drives Measurement Instruments

Camcorders Modems

Analog Signal-Processing Digital Cameras

Applications

____________________________Features

♦ Regulated Negative Output Voltage

(up to -1 x V

)

♦ 125mA Output Current

♦ 35µA Quiescent Supply Current

(Skip-mode regulation)

♦ 350kHz Fixed-Frequency, Low-Noise Output

(Linear-mode regulation)

♦ 2V to 5.5V Input Range

♦ 1µA Logic-Controlled Shutdown

MAX1673

Regulated, 125mA-Output,

Charge-Pump DC-DC Inverter

________________________________________________________________

Maxim Integrated Products

OUTSHDN

GNDCAP+

CAP-

LIN/SKIP

TOP VIEW

MAX1673

INPUT 2V TO 5.5V

REGULATED

NEGATIVE

OUTPUT

(UP TO -1 x V

UP TO 125mA)

LIN/SKIP

OUT

GND

CAP+

OFF

SHDN

CAP-

Typical Operating Circuit

___________________Pin Configuration

19-1334; Rev 0; 1/98

PART

MAX1673ESA -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO

_______________Ordering Information

On-Demand™ is a trademark of Maxim Integrated Products.

1 2 3 4 5 6 7 8

Indice de contenidos

Pagina 1 - Charge-Pump DC-DC Inverter

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.________

Pagina 2

MAX1673Regulated, 125mA-Output,Charge-Pump DC-DC Inverter2 _______________________________________________________________________________________ABSO

Pagina 3

VFB= -25mVMAX1673Regulated, 125mA-Output,Charge-Pump DC-DC Inverter___________________________________________________________________________________

Pagina 4

MAX1673Regulated, 125mA-Output,Charge-Pump DC-DC Inverter4 _______________________________________________________________________________________Typi

Pagina 5

MAX1673Regulated, 125mA-Output,Charge-Pump DC-DC Inverter_______________________________________________________________________________________ 5VOUT

Pagina 6

MAX1673Detailed DescriptionThe MAX1673 new-generation, high-output-current,regulated charge-pump DC-DC inverter provides up to125mA. Designed specific

Pagina 7

Linear Mode (Constant-Frequency Mode)In LIN mode (LIN/SKIP = IN), the charge pump runs con-tinuously at 350kHz. The MAX1673 controls the chargeon CFLY

Pagina 8

MAX1673Regulated, 125mA-Output,Charge-Pump DC-DC InverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely emb

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Rainbow-electronics MAX1673 Manual de usuario

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