Rainbow-electronics MAX1681 Manual de usuario descargar pdf (Pagina 1)

_______________General Description

The MAX1680/MAX1681 inductorless switched-capaci-

tor voltage converters either invert an input voltage of

+2.0V to +5.5V or double it while supplying up to

125mA output current. They have a selectable-frequen-

cy option that allows the use of small capacitors: 4.7µF

(MAX1680), 1µF (MAX1681). With their high output cur-

rent capability, these charge-pump devices are suit-

able replacements for inductor-based regulators, which

require more expensive external components and addi-

tional board space.

The devices’ equivalent output resistance (typically

3.5Ω) allows them to deliver as much as 125mA with

only a 440mV drop. A shutdown feature reduces quies-

cent current to less than 1µA. The MAX1680/MAX1681

are available in 8-pin SO packages. For devices that

deliver up to 50mA in smaller µMAX packages, refer to

the MAX860/MAX861 data sheet.

________________________Applications

Local Negative Supplies

Interface Power Supplies

Op-Amp Power Supplies

MOSFET Bias

____________________________Features

♦ Selectable Switching Frequencies:

125kHz/250kHz (MAX1680)

500kHz/1MHz (MAX1681)

♦ Allow Use of Small Capacitors

(1µF for the MAX1681)

♦ 125mA Output Current

♦ 3.5Ω Output Impedance

♦ 1µA Logic-Controlled Shutdown

♦ Configurable as Voltage Inverters or Doublers

♦ +2.0V to +5.5V Input Voltage Range

♦ Available in 8-Pin SO Packages

♦ 90% Efficiency

MAX1680/MAX1681

125mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

________________________________________________________________

Maxim Integrated Products

MAX1681

FSEL IN

CAP+ SHDN

GND

1µF

INPUT

+3V TO +5.5V

INVERTED

OUTPUT

VOLTAGE

1µF

CAP-

INVERTER CONFIGURATION

OUT

MAX1681

FSEL IN

CAP+ SHDN

GND

1µF

DOUBLED

OUTPUT

VOLTAGE

INPUT

+4V TO +5.5V

NOTE: USE 4.7µF CAPACITORS FOR MAX1680

INPUT VOLTAGE RANGE: +2.5V TO +5.5V.

NOTE: USE 4.7µF CAPACITORS FOR MAX1680

INPUT VOLTAGE RANGE: +2.0V TO +5.5V.

1µF

CAP-

DOUBLER CONFIGURATION

OUT

__________________________________________________Typical Operating Circuits

19-1247; Rev 0; 7/97

PART

MAX1680C/D

MAX1680ESA

MAX1681C/D

0°C to +70°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice*

8 SO

Dice*

______________Ordering Information

Contact factory for dice specifications.

Pin Configuration appears at end of data sheet.

MAX1681ESA -40°C to +85°C 8 SO

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.

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1 - 125mA, Frequency-Selectable

_______________General DescriptionThe MAX1680/MAX1681 inductorless switched-capaci-tor voltage converters either invert an input voltage of+2.0V to +5

Pagina 2

MAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters 10 _________________________________________________________________

Pagina 3

MAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters ____________________________________________________________________

Pagina 4

MAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters NOTESMaxim cannot assume responsibility for use of any circuitry oth

Pagina 5

VMAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters 2 _________________________________________________________________

Pagina 6

mAELECTRICAL CHARACTERISTICS(Typical Operating Circuits (inverter configuration), FSEL = LV = GND, VIN= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF(

Pagina 7

MAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters 4 __________________________________________________________________

Pagina 8

MAX1680/MAX1681125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters ____________________________________________________________________

Pagina 9

_______________Detailed DescriptionThe MAX1680/MAX1681 switched-capacitor voltageconverters either invert or double the input voltage.They have low ou

Pagina 10

Operating Frequency Trade-OffsIt is important to recognize the trade-offs betweenswitching frequency, power consumption, noise, cost,and performance.

Pagina 11

MAX1680/MAX1681Bypass CapacitorBypass the input voltage to reduce AC impedance andto prevent internal switching noise. Bypassing dependson the source

Pagina 12

Combined Doubler and InverterFigure 3 shows a single MAX1680/MAX1681 as aninverter and a doubler. The maximum output current isthe sum of the loads on

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