Rainbow-electronics MAX768 Manual de usuario descargar pdf (Pagina 3)

MAX768

Low-Noise, Dual-Output, Regulated Charge Pump

for GaAsFET, LCD, and VCO Supplies

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +3V, SYNC = IN, SETN = SETP = GND, NSHDN = PSHDN = IN, T

= -40°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C. See Figure 2.) (Note 1)

SYNC = GND (divide by 4)

CONDITIONS

µA0.1 2SYNC Input Leakage Current

21.5 25 28.5

%40 60SYNC Duty Cycle (external)

kHz20 240SYNC Frequency Range (external)

UNITSMIN TYP MAXPARAMETER

NOUT

= 0.1mA

POUT

= 0.1mA

-1.275 -1.25 -1.225

Negative Set-Reference Voltage

-1.270 -1.25 -1.230

1.215 1.25 1.285

Positive Set-Reference Voltage

1.217 1.25 1.283

RDY

= 10V

Percent of V

NOUT

, I

NOUT

= 5mA

SETP

= V

SETN

= 1.3V

mA10Maximum Sink Current

µA0.01 2Output Off Current

%85 94 98

RDY Output Threshold

µA0.01 0.1SETP, SETN Input Leakage Current

SYNC

= 3V

kHz

85 100 115

Oscillator Frequency (internal)

= +25°C

= -40°C to + 85°C

= +25°C

= -40°C to + 85°C

SINK

= 2mA V0.25Output Low Voltage

SYNC

SET INPUT

OUTPUT

Note 1: Parameters to -40°C are guaranteed by design, not production tested.

Note 2: Maximum output voltage range is from the positive reference voltage to 2 x V

- dropout voltage.

Note 3: Maximum output voltage range is from the negative reference voltage to -2 x V

+ dropout voltage.

__________________________________________Typical Operating Characteristics

(SYNC = IN, T

= +25°C, unless otherwise noted.)

0.30

IN = 3.0V

NOUT = -5V

POUT = +5V

0 5 15 25

RMS

OUTPUT VOLTAGE

vs. OUTPUT CURRENT

0.10

MAX768-TOC01

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (mV

RMS

)

10 20

0.20

5.2

4.0

0 5 15 30

POUT OUTPUT VOLTAGE 

vs. OUTPUT CURRENT



4.2

4.8

5.0

MAX768-TOC02

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

10 20 25

4.6

4.4

IN = 4.0V

IN = 3.0V



ONLY POUT LOADED

-4.2

-5.0

0 5 15 30

NOUT OUTPUT VOLTAGE vs. 

OUTPUT CURRENT



-4.9

-4.4

-4.3

MAX768-TOC03

OUTPUT CURRENT (mA)

OUTPUT VOLTAGE (V)

10 20 25

-4.5

-4.7

-4.8

-4.6

IN = 4.0V

IN = 3.0V



ONLY NOUT LOADED

1 2 3 4 5 6 7 8 ... 11 12

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Rainbow-electronics MAX768 Manual de usuario Pagina 3

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