Rainbow-electronics MAX8715 Manual do Utilizador descarregar pdf (Página 3)

MAX1790/MAX8715

Low-Noise Step-Up DC-DC Converters

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ELECTRICAL CHARACTERISTICS

= SHDN = 3V, FREQ = GND, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

ELECTRICAL CHARACTERISTICS (continued)

= SHDN = 3V, FREQ = GND, T

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

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

MAX1790

0.30 0.45 0.65

Current-Sense Transresistance R

MAX8715

0.20 0.30 0.43

V/A

SOFT-START

Reset Switch Resistance

100

Ω

Charge Current V

= 1.2V 1.5 4 7.0 µA

CONTROL INPUTS

Input Low Voltage V

SHDN, FREQ

0.3 x V

Input High Voltage V

SHDN, FREQ

0.7 x V

Hysteresis SHDN, FREQ

0.1 x V

FREQ Pulldown Current I

FREQ

1.8 5 9.0 µA

SHDN Input Current I

SHDN

0.001

1µA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Supply Range V

2.6 5.5 V

Undervoltage Lockout UVLO

rising, typical hysteresis is 40mV,

LX remains off below this level

2.25 2.52 V

= 1.3V, not switching 0.35

MAX1790

= 1.0V, switching 5

= 1.3V, not switching 0.35

Quiescent Current I

MAX8715

= 1.0V, switching 5

Shutdown Supply Current I

SHDN = GND 10 µA

ERROR AMPLIFIER

Feedback Voltage V

Level to produce V

COMP

= 1.24V 1.215 1.24 1.260 V

MAX1790 40

FB Input Bias Current I

= 1.24V

MAX8715 190

Feedback-Voltage Line

Regulation

Level to produce V

COMP

= 1.24V,

2.6V < V

< 5.5V

0.15 %/V

MAX1790 70 260

Transconductance g

∆I = 5µA

MAX8715 70 260

µS

OSCILLATOR

FREQ = GND

490 770

Frequency f

OSC

FREQ = IN 900 1500

kHz

Maximum Duty Cycle DC FREQ = GND 78 92 %

1 2 3 4 5 6 7 8 ... 13 14

MAX1790/MAX8715 1

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