MAX768CSLASHD datasheet(3/12 Pages) MAXIM

3 / 12 page

Low-Noise, Dual-Output, Regulated Charge Pump

for GaAsFET, LCD, and VCO Supplies

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +3V, SYNC = IN, SETN = SETP = GND, NSHDN = PSHDN = IN, TA = -40°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C. See Figure 2.) (Note 1)

SYNC = GND (divide by 4)

CONDITIONS

µA

0.1

SYNC Input Leakage Current

21.5

28.5

SYNC Duty Cycle (external)

kHz

240

SYNC Frequency Range (external)

UNITS

MIN

TYP

MAX

PARAMETER

INOUT = 0.1mA

IPOUT = 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

VRDY = 10V

Percent of VNOUT, INOUT = 5mA

VSETP = VSETN = 1.3V

Maximum Sink Current

µA

0.01

Output Off Current

RDY Output Threshold

µA

0.01

0.1

SETP, SETN Input Leakage Current

VSYNC = 3V

kHz

100

115

Oscillator Frequency (internal)

TA = +25°C

TA = -40°C to + 85°C

TA = +25°C

TA = -40°C to + 85°C

ISINK = 2mA

0.25

Output Low Voltage

SYNC

SET INPUT

RDY 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 VIN - dropout voltage.

Note 3: Maximum output voltage range is from the negative reference voltage to -2 x VIN + dropout voltage.

__________________________________________Typical Operating Characteristics

(SYNC = IN, TA = +25°C, unless otherwise noted.)

0.30

IN = 3.0V

NOUT = -5V

POUT = +5V

mVRMS OUTPUT VOLTAGE

vs. OUTPUT CURRENT

0.10

OUTPUT CURRENT (mA)

0.20

5.2

4.0

POUT OUTPUT VOLTAGE

vs. OUTPUT CURRENT

4.2

4.8

5.0

OUTPUT CURRENT (mA)

4.6

4.4

IN = 4.0V

IN = 3.0V

ONLY POUT LOADED

-4.2

-5.0

NOUT OUTPUT VOLTAGE vs.

OUTPUT CURRENT

-4.9

-4.4

-4.3

OUTPUT CURRENT (mA)

-4.5

-4.7

-4.8

-4.6

IN = 4.0V

IN = 3.0V

ONLY NOUT LOADED

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