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_______________General Description

The MAX865 is a CMOS charge-pump DC-DC convert-

er in an ultra-small µMAX package. It produces positive

and negative outputs from a single positive input, and

requires only four capacitors. The charge pump first

doubles the input voltage, then inverts the doubled volt-

age. The input voltage ranges from +1.5V to +6.0V.

The internal oscillator is guaranteed to be between

20kHz and 38kHz, keeping noise above the audio

range while consuming minimal supply current. A 75Ω

output impedance permits useful output currents up to

20mA.

The MAX865 comes in a 1.11mm-high, 8-pin µMAX

package that occupies half the board area of a stan-

dard 8-pin SOIC. For a device with selectable frequen-

cies and logic-controlled shutdown, refer to the MAX864

data sheet.

________________________Applications

Low-Voltage GaAsFET Bias in Wireless Handsets

VCO and GaAsFET Supplies

Split Supply from 3 Ni Cells or 1 Li+ Cell

Low-Cost Split Supply for Low-Voltage

Data-Acquisition Systems

Split Supply for Analog Circuitry

LCD Panels

____________________________Features

♦ 1.11mm-High µMAX Package

♦ Compact: Circuit Fits in 0.08in

♦ Requires Only Four Capacitors

♦ Dual Outputs (positive and negative)

♦ +1.5V to +6.0V Input Voltage

♦ 20kHz (min) Frequency (above the audio range)

MAX865

Compact, Dual-Output Charge Pump

________________________________________________________________

Maxim Integrated Products

C1+

V+

GND

V-

C2-

C2+

C1-

MAX865

µMAX

TOP VIEW

__________________Pin Configuration

MAX865

C1+

V+

GND

to ±2V

CONVERTER

V-

GND

C1-

C2+

C2-

+2*V

(+1.5V to +6.0V)

-2*V

__________Typical Operating Circuit

19-0472; Rev 1; 7/97

PART

MAX865C/D

MAX865EUA -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice

8 µMAX

______________Ordering Information

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 7 8

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Página 1 - Maxim Integrated Products

_______________General DescriptionThe MAX865 is a CMOS charge-pump DC-DC convert-er in an ultra-small µMAX package. It produces positiveand negative o

Página 2 - ELECTRICAL CHARACTERISTICS

1009000 2 8 10 18EFFICIENCY vs. OUTPUT CURRENT(VIN = 5V)3020108070MAX865-01OUTPUT CURRENT (mA)EFFICIENCY (%)4 6 12 1450406016 V- V+1009000 1 3 4 8EFFI

Página 3 - (Circuit of Figure 1, V

MAX865Compact, Dual-Output Charge Pump_______________________________________________________________________________________3108-100 2 6 14OUTPUT VOL

Página 4 - Figure 1. Test Circuit

_____________________Pin DescriptionNAME FUNCTION1C1-Negative Terminal of the Flying BoostCapacitor2 C2+Positive Terminal of the FlyingInverting Capac

Página 5 - Charge-Pump Output

MAX865Compact, Dual-Output Charge Pump_______________________________________________________________________________________ 5_______________Detailed

Página 6 - Efficiency Considerations

converter (RS+), where ILOAD+is the combination of IV-and the external load on V+ (IV+):Determine V+ and V- as follows:The output resistance for the p

Página 7 - Heavy Output Current Loads

A substantial voltage difference exists between (V+ -VIN) and VIN for the positive pump, and between V+and V- if the impedances of the pump capaci

Página 8 - MICROMAX SMALL-OUTLINE

MAX865Compact, Dual-Output Charge Pump________________________________________________________Package Information___________________Chip TopographyTRA

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