MAX868CSLASHD datasheet(3/12 Pages) MAXIM

3 / 12 page

Regulated, Adjustable -2x

Inverting Charge Pump

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

(VIN = +3.3V, C1 = C2 = 0.22µF, CIN = 1µF, COUT = 10µF, TA = -40°C to +85°C, unless otherwise noted. (Note 1)

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

RL = 3kΩ to GND

VFB = 50mV

No load, VFB = -50mV

No load, SHDN = GND

CONDITIONS

kHz

270

630

fOSC

Oscillator Frequency

µA

IIN,SHDN

Shutdown Current

1.8

5.5

VIN

Supply-Voltage Range

µA

IIN

Supply Current

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

IOUT = 5mA, FB = IN

VIN = 1.8V to 5.5V

SHDN = GND (OUT pulls to GND)

VIN = 1.8V to 5.5V

-100

100

FB Input Bias Current

-40

FB Trip Point

125

Open-Loop Output

Resistance

Ω

ROUT

VIN = 5.5V, SHDN = IN or GND

VIN = 1.8V to 5.5V

-100

100

SHDN Input Bias Current

0.7VIN

VIH

SHDN Input Threshold

0.3VIN

VIL

__________________________________________Typical Operating Characteristics

(Circuit of Figure 5, TA = +25°C, unless otherwise noted.)

-35

-25

-30

-20

-5

-10

-15

10 15 20 25

30 35 40 45 50

LOAD-REGULATION ERROR

vs. LOAD CURRENT

(VIN = 5V)

LOAD CURRENT (mA)

VOUT = -7.5V

VOUT = -3.3V

VOUT = -5V

-15

-9

-12

-3

-6

LOAD-REGULATION ERROR

vs. LOAD CURRENT

(VIN = 3.3V)

LOAD CURRENT (mA)

VOUT = -3.3V

VOUT = -5V

400

410

430

440

420

480

470

460

450

500

490

-40

-20

100

MAXIMUM SWITCHING FREQUENCY

vs. TEMPERATURE

TEMPERATURE (°C)

FB = IN

VIN = 3.3V

VIN = 2V

VIN = 5V

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