Rainbow-electronics MAX861 Uživatelský manuál stáhnout pdf

_______________General Description

The MAX860/MAX861 charge-pump voltage converters

invert input voltages ranging from +1.5V to +5.5V, or

double input voltages ranging from +2.5V to +5.5V.

Because of their high switching frequencies, these

devices use only two small, low-cost capacitors. Their

50mA output makes switching regulators unnecessary,

eliminating inductors and their associated cost, size,

and EMI. Greater than 90% efficiency over most of the

load-current range, combined with a typical operating

current of only 200µA (MAX860), provides ideal perfor-

mance for both battery-powered and board-level volt-

age-conversion applications.

A frequency-control (FC) pin provides three switching-

frequencies to optimize capacitor size and quiescent

current and to prevent interference with sensitive cir-

cuitry. Each device has a unique set of three available

frequencies. A shutdown (S

—

–

) pin reduces current

consumption to less than 1µA. The MAX860/MAX861

are suitable for use in applications where the ICL7660

and MAX660's switching frequencies are too low. The

MAX860/MAX861 are available in 8-pin µMAX and

SO packages.

________________________Applications

Portable Computers

Medical Instruments

Interface Power Supplies

Hand-Held Instruments

Operational-Amplifier Power Supplies

____________________________Features

♦ 8-Pin, 1.11mm High µMAX Package

♦ Invert or Double the Input Supply Voltage

♦ Three Selectable Switching Frequencies

♦ High Frequency Reduces Capacitor Size

♦ 87% Efficiency at 50mA

♦ 200µA Quiescent Current (MAX860)

♦ 1µA Shutdown Supply Current

♦ 600mV Voltage Drop at 50mA Load

♦ 12Ω Output Resistance

______________Ordering Information

MAX860/MAX861

50mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

________________________________________________________________

Maxim Integrated Products

SHDN

OUT

C1-

GND

C1+

MAX860

MAX861

SO/µMAX

TOP VIEW

__________________Pin Configuration

C1+

GND

C1- OUT

SHDN

MAX860

MAX861

C1+

GND

C1- OUT

SHDN

MAX860

MAX861

INPUT

VOLTAGE

+1.5V TO +5.5V

INVERTED

NEGATIVE

OUTPUT

INPUT

VOLTAGE

+2.5V TO +5.5V

DOUBLED

POSITIVE

OUTPUT

10µF

VOLTAGE INVERTER

POSITIVE VOLTAGE DOUBLER

__________Typical Operating Circuit

19-0239; Rev 1; 11/96

PART

MAX860ISA

MAX860IUA -25°C to +85°C

-25°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO

8 µMAX

* Dice are tested at T

= +25°C, DC parameters only.

†

Contact factory for availability.

MAX860C/D 0°C to +70°C Dice*

MAX860ESA -40°C to +85°C 8 SO

MAX860MJA -55°C to +125°C

8 CERDIP

†

MAX861ISA

-25°C to +85°C 8 SO

MAX861IUA -25°C to +85°C 8 µMAX

MAX861C/D 0°C to +70°C Dice*

MAX861ESA -40°C to +85°C 8 SO

MAX861MJA -55°C to +125°C

8 CERDIP

†

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

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Shrnutí obsahu

Strany 1 - 50mA, Frequency-Selectable

_______________General DescriptionThe MAX860/MAX861 charge-pump voltage convertersinvert input voltages ranging from +1.5V to +5.5V, ordouble input vo

Strany 2

MAX860/MAX86150mA, Frequency-Selectable,Switched-Capacitor Voltage Converters10 ______________________________________________________________________

Strany 3