Rainbow-electronics MAX1797 Manual do Utilizador descarregar pdf (Página 2)

MAX1795/MAX1796/MAX1797

Low Supply Current, Step-Up DC-DC Converters

with True-Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

BATT

= +2V, OUT = FB (V

OUT

= +3.3V), SHDN = LBI = GND, T

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

= +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.

OUT, LX, SHDN, LBI, LBO, BATT to GND................-0.3V to +6V

FB .............................................................-0.3V to (V

OUT

+ 0.3V)

, I

OUT

..............................................................................±1.5A

Output Short-Circuit Duration ...................................................5s

Continuous Power Dissipation

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

Operating Temperature Range ...........................-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

Minimum Input Voltage After startup 0.7 V

Operating Voltage V

BATT

(Note 1) 1.0 5.5 V

Startup Voltage T

= +25°C, R

= 3kΩ 0.85 1.0 V

Startup Voltage Tempco -2.2 m V /°C

OUT

FB = OUT 3.17 3.3 3.43

Output Voltage

FB = GND 4.80 5.0 5.20

Adjustable Output Voltage

Range

2.0 5.5 V

MAX1795 100 180

MAX1796 200 300

BATT = +2V,

FB = OUT

OUT

= +3.3V)

MAX1797 400 550

MAX1795 50 120

MAX1796 100 200

Steady-State Output Current I

OUT

BATT = +2V,

FB = GND

OUT

= +5.0V)

MAX1797 250 370

Feedback Set-Point Voltage

(Adjustable Mode)

OUT

= +2V to +5.5V 1.20 1.24 1.28 V

Feedback Input Current I

= +1.24V 4 100 nA

NFET 0.17 0.3

Internal NFET, PFET On-

Resistance

(

)

OUT

= +3.3V,

= 100mA

PFET 0.27 0.45

Ω

MAX1795 0.2 0.25 0.35

MAX1796 0.4 0.5 0.625

LX Switch Current Limit (NFET

only)

LIM

MAX1797 0.8 1.0 1.25

LX Leakage Current I

LEAK

= 0 and +5.5V, V

OUT

= +5.5V 0.2 µA

Synchronous Rectifier Turn-Off

Current Limit

25 mA

Damping Switch On-Resistance R

DAMP

100 200 400 Ω

Operating Current into OUT

(Note 2)

= +1.4V 25 45 µA

1 2 3 4 5 6 7 ... 12 13

MAX1795/MAX1796/MAX1797 1

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