Rainbow-electronics MAX1790 Manual de usuario descargar pdf (Pagina 3)

MAX1790

Low-Noise Step-Up DC-DC Converter

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ELECTRICAL CHARACTERISTICS

= SHDN = 3V, FREQ = GND, T

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

Note 1: Current limit varies with duty cycle due to slope compensation. See the Output Current Capability section.

Note 2: Specifications to -40°C are guaranteed by design and not production tested.

PARAMETER SYMBOL MIN TYP MAX UNITS

Feedback Voltage V

1.215 1.26

Shutdown Supply Current I

µA

FB Input Bias Current I

Feedback-Voltage Line

Regulation

0.15

%/V

Transconductance g

70 260

µmhos

Undervoltage Lockout

Input Supply Range V

2.6 5.5

UVLO

2.25 2.52

Quiescent Current I

0.2 0.35

Frequency f

OSC

490 770

kHz

900 1500

Maximum Duty Cycle DC

78 92

Current Limit I

LIM

1.2 2.3

On-Resistance R

0.5

Ω

Current-Sense Transresistance R

0.3 0.65

V/A

Input Low Voltage V

0.3 · V

Input High Voltage V

0.7 · V

CONDITIONS

FREQ = GND

Level to produce V

COMP

= 1.24V

FREQ = IN

SHDN = GND

= 1.0V, switching

= 1.24V

Level to produce V

COMP

= 1.24V,

2.6V < V

< 5.5V

FREQ = GND

∆I = 5µA

= 1V, duty cycle = 65%

= 1.2A

rising, typical hysteresis is 40mV,

LX remains off below this level

SHDN, FREQ, V

= 2.6V to 5.5V

SHDN, FREQ, V

= 2.6V to 5.5V

= 1.3V, not switching

ERROR AMPLIFIER

OSCILLATOR

N-CHANNEL SWITCH

CONTROL INPUTS

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

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Rainbow-electronics MAX1790 Manual de usuario Pagina 3

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