Rainbow-electronics MAX8715 Bedienungsanleitung PDF herunterladen (Seite 2)

MAX1790/MAX8715

Low-Noise Step-Up DC-DC Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= SHDN = 3V, FREQ = GND, T

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

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

LX to GND ..............................................................-0.3V to +14V

IN, SHDN, FREQ, FB to GND................................-0.3V to +6.2V

SS, COMP to GND.......................................-0.3V to (V

+ 0.3V)

RMS LX Pin Current ..............................................................1.2A

Continuous Power Dissipation (T

= +70°C)

8-Pin µMAX (derate 4.1mW/°C above +70°C).............330mW

Operating Temperature Range

MAX1790EUA/MAX8715EUA ........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10s).................................+300°C

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 2.38 2.52

= 1.3V, not switching 0.18 0.35

MAX1790

= 1.0V, switching 2 5

= 1.3V, not switching 0.21 0.35

Quiescent Current I

MAX8715

= 1.0V, switching 2.5 5.0

Shutdown Supply Current I

SHDN = GND 0.1 10 µA

ERROR AMPLIFIER

Feedback Voltage V

Level to produce V

COMP

= 1.24V

1.222 1.24 1.258

MAX1790 0 40

FB Input Bias Current I

= 1.24V

MAX8715

125 190

Feedback-Voltage Line

Regulation

Level to produce V

COMP

= 1.24V,

2.6V < V

< 5.5V

0.05 0.15

%/V

MAX1790 70

140 240

Transconductance g

∆I = 5µA

MAX8715 70

160 240

µS

Voltage Gain A

700

V/V

OSCILLATOR

FREQ = GND

540 640 740

Frequency f

OSC

FREQ = IN

1000 1220 1500

kHz

FREQ = GND

79 85 92

Maximum Duty Cycle DC

FREQ = IN 84

N-CHANNEL SWITCH

MAX1790 1.2 1.6 2.3

Current Limit I

LIM

= 1V,

duty cycle =

65% (Note 1)

MAX8715 1.8 2.4 3.4

MAX1790

0.21

0.5

On-Resistance R

MAX8715

0.15 0.35

Ω

MAX1790

0.01

Leakage Current I

LXOFF

= 12V

MAX8715 5 30

µA

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

MAX1790/MAX8715 1

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