Rainbow-electronics MAX1681 Instrukcja Użytkownika Pobierz pdf (Strona 3)

ELECTRICAL CHARACTERISTICS

(

Typical Operating Circuits

(inverter configuration), FSEL = LV = GND, V

= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF

(MAX1681), T

= -40°C to +85°C, unless otherwise noted.) (Note 4)

MAX1680/MAX1681

125mA, Frequency-Selectable,

Switched-Capacitor Voltage Converters

_______________________________________________________________________________________ 3

FSEL = IN

FSEL = LV

MAX1681

LOAD

= 125mA

21.6

Inverter configuration,

= 1kΩ, LV = GND

43.2

Doubler configuration,

= 1kΩ, LV = OUT

MAX1681

FSEL = LV

FSEL = IN

MAX1680

LV = GND (Note 3)

FSEL = IN or LV

SHDN = IN

OUT = GND, SHDN = IN

CONDITIONS

I+

FSEL = IN

(500kHz)

Supply Current

FSEL = LV

(1MHz)

kHz

285 745

OSC

570 1490

79 174

157 348

Switching Frequency

V-3.75V

LOAD

Output Voltage Under Load

(Note 2)

3.0 5.5

2.0 5.5

4.0 5.5

-1 1V

Shutdown, FSEL Thresholds

µA-1 1I

FSEL

Input Bias Current (FSEL)

Ω10R

OUT

Output Resistance (Note 2)

Ω5R

OUT(SHUT)

Output Resistance in

Shutdown

µA1I+

SHDN

Shutdown Current

µA1I

SHDN

Input Bias Current (SHDN)

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX1681

MAX1680

2.5 5.5

Input Voltage Range

MAX1681

MAX1680

5.4

10.8

FSEL = IN

(125kHz)

FSEL = LV

(250kHz)

ELECTRICAL CHARACTERISTICS (continued)

(

Typical Operating Circuits

(inverter configuration), FSEL = LV = GND, V

= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF

(MAX1681), T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

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

higher ESR reduces output voltage and efficiency. The specified output resistance includes the C1 and C2 0.2Ω ESR.

Note 3: The typical threshold for V

INPUT

other than +5V is 0.35V

INPUT

= V

Note 4: Specifications to -40°C are guaranteed by design, not production tested.

= 100Ω to GND, FSEL = IN

MAX1680

MAX1681

Power Efficiency

UNITSMIN TYP MAXSYMBOLPARAMETER CONDITIONS

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

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