MAX860ISA+T Datasheet MAX860ISA+T, MAX860ESA+, MAX861ESA+ | P1-P3

_______________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 1

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 2; 4/03

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 pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX860/MAX861

50mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit (Inverter), V

= +5V,

–

—

–

= V

, FC = LV = GND, C1 = C2 = 10µF (Note 2), T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (V

to GND or GND to OUT)...................+6.0V

Input Voltage Range (LV, FC,

–

—

–

) ...................(OUT - 0.3V)

to (V

+ 0.3V)

Continuous Output Current (OUT, V

) .............................60mA

Output Short-Circuit to GND (Note 1).......................................1s

Continuous Power Dissipation (T

= +70°C)

SO (derate 5.88mW/°C above +70°C).........................471mW

µMAX (derate 4.10mW/°C above +70°C) ....................330mW

CERDIP (derate 8.00mW/°C above +70°C).................640mW

Operating Temperature Ranges

MAX86_I_A ......................................................-25°C to +85°C

MAX86_ESA.....................................................-40°C to +85°C

MAX86_MJA ..................................................-55°C to +125°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

= 10mA, V

= 2V

= 1kΩ

= 50mA

= 3V, V

OUT

more negative than -2.5V

= 5V, V

OUT

more negative than -3.75V

MAX861M

MAX860M

MAX861I/E

MAX860I/E

CONDITIONS

Ω

20 35

OUT

Output Resistance

(Note 4)

12 25

mAI

OUT

Output Current

50 100

6.5

No-Load Supply Current

(Note 3)

2.6

0.5

2.5 5.0

1.1 2.0

2.5 5.5

Supply Voltage

1.5 5.5

0.3 0.4

3.3

1.3

0.4

0.2 0.3

0.07

0.6 1.0

1.4 2.5

UNITSMIN TYP MAXSYMBOLPARAMETER

Inverter, LV = GND

Doubler, LV = OUT

FC = V

= 5V

FC = OUT

FC = GND

FC = V

= 3V

FC = V

FC = OUT

FC = GND

FC = V

FC = OUT

FC = GND

FC = V

FC = OUT

FC = GND

10 30

Note 1: OUT may be shorted to GND for 1sec without damage, but shorting OUT to V

may damage the device and should be

avoided. Also, for temperatures above +85°C, OUT must not be shorted to GND or V

, even instantaneously, or device

damage may result.

MAX860/MAX861

50mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit (Inverter), V

= +5V,

–

—

–

= V

, FC = LV = GND, C1 = C2 = 10µF (Note 2), T

= T

MIN

to T

MAX

, unless

otherwise noted. Typical values are at T

= +25°C.)

Note 2: C1 and C2 are low-ESR (<0.2Ω) aluminum electrolytics. Capacitor ESR adds to the circuit’s output resistance. Using

capacitors with higher ESR may reduce output voltage and efficiency.

Note 3: MAX860/MAX861 may draw high supply current during startup, up to the minimum operating supply voltage. To guaran-

tee proper startup, the input supply must be capable of delivering 90mA more than the maximum load current.

Note 4: Specified output resistance includes the effect of the 0.2Ω ESR of the test circuit’s capacitors.

Note 5: The switches are driven directly at the oscillator frequency, without any division.

Note 6: At lowest frequencies, using 10µF capacitors gives worse efficiency figures than using the recommended capacitor

values in Table 3, due to larger 1 ⁄ (f

x C1) term in R

OUT

–

—

–

< 0.3V

MAX860

LV = GND

No load

MAX860/MAX861, FC = V

= 50mA to GND, C1 = C2 = 68µF

MAX860,

FC = V

MAX861,

FC = V

MAX861

FC < 4V

CONDITIONS

µA

Shutdown Supply Current

0.3V

–

—

–

Threshold

1.2V

%99 99.9Voltage-Conversion Efficiency

Power Efficiency (Note 6)

88 92

93 96

80 130

30 50

90 93

93 96

813

60 100

kHz

160 250

Switching Frequency

(Note 5)

µA-2 -4I

FC Current (from V

)

UNITSMIN TYP MAXSYMBOLPARAMETER

No load, V

OUT

= -4V µs500Time to Exit Shutdown

FC = V

FC = GND

FC = OUT

FC = V

FC = GND

FC = OUT

= 2kΩ from V

to OUT

= 1kΩ from OUT

to GND

= 2kΩ from V

to OUT

= 1kΩ from OUT

to GND

MAX86_I/E

MAX86_M

P1-P3 P4-P6 P7-P9 P10-P11

MAX860ISA+T

Mfr. #:

Buy MAX860ISA+T

Manufacturer:

Maxim Integrated

Description:

Switching Voltage Regulators 50mA f-Selectable Voltage Converter

Lifecycle:

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MAX860ISA+T

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