Rainbow-electronics MAX863 Manual de usuario descargar pdf (Pagina 3)

MAX863

Dual, High-Efficiency, PFM, Step-Up

DC-DC Controller

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

= +5V, I

LOAD

= 0mA, T

= -40°C to +85°C, unless otherwise noted.) (Note 6)

Note 1: When bootstrapped, an internal low-voltage oscillator drives the EXT1 pin rail-to-rail for low supply voltages.

Note 2: For non-bootstrapped operation, V

> 2.7V is required to allow valid operation of all internal circuitry.

Note 3: For adjustable output voltages, see the Set the Output Voltage section.

Note 4: Measured with LBI falling. Typical hysteresis is 15mV.

Note 5: EXT1 and EXT2 swing from V

to GND.

Note 6: Specifications to -40°C are guaranteed by design and not production tested.

= OUT1 (Note 1) 1.6 11

CONDITIONS

Input Voltage

(Note 2)

2.8 11

V1.21 1.285V

FB1, FB2 Threshold Voltage

mV85 115V

CS1, CS2 Threshold Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

FB1 = V

3.15 3.45

OUT1 Output Voltage

(Note 3)

FB1 = GND

4.8 5.2

OUT1

SHDN1 = SHDN2 = V

, measured from V

Quiescent Current

SHDN1 = V

, SHDN2 = GND,

measured from V

µAI

SHDN1 = SHDN2 = GND

µA1I

DD, SHDN

Shutdown Current

__________________________________________Typical Operating Characteristics

= +25°C, unless otherwise noted.)

0.01 0.1 1 10 100 1000

EFFICIENCY vs. OUTPUT CURRENT

OUT1

= 3.3V, BOOTSTRAPPED)

MAX863 toc01

OUTPUT CURRENT (mA)

EFFICIENCY (%)

100

OUT1

= 3.3V

A: V

= 1.5V

B: V

= 2.4V

C: V

= 2.7V

0.01 0.1

100

1 10 100 1000

EFFICIENCY vs. OUTPUT CURRENT

OUT1

= 5.0V, BOOTSTRAPPED)

MAX863 toc02

OUTPUT CURRENT (mA)

EFFICIENCY (%)

OUT1

= 5.0V

A: V

= 1.5V

B: V

= 2.4V

C: V

= 2.7V

D: V

= 3.3V

E: V

= 3.6V

F: V

= 4.0V

0.01 0.1

100

1 10 100 1000

EFFICIENCY vs. OUTPUT CURRENT

OUT1

= 5.0V, NON-BOOTSTRAPPED)

MAX863 toc03

OUTPUT CURRENT (mA)

EFFICIENCY (%)

OUT1

= 5.0V

A: V

= 2.7V

B: V

= 3.3V

C: V

= 3.6V

D: V

= 4.0V

1 2 3 4 5 6 7 8 ... 15 16

DC-DC Controller 1

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Rainbow-electronics MAX863 Manual de usuario Pagina 3

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