Rainbow-electronics MAX1817 Manual do Utilizador descarregar pdf (Página 2)

MAX1817

Compact, High-Efficiency, Dual-Output

Step-Up DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

ONLCD

OUT

= +3.3V, FB = 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.

OUT to GND .............................................................-0.3V to +6V

ON, ONLCD, FB, FBLCD, LX to GND ......-0.3V to (V

OUT

+ 0.3V)

LXLCD to GND .......................................................-0.3V to +30V

AGND to GND .......................................................-0.3V to +0.3V

Continuous Power Dissipation (T

= +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW

LXLCD, LX Maximum Current ........................................0.5A

RMS

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 CONDITIONS MIN TYP MAX UNITS

GENERAL

Input Voltage Range 1.5 5.5 V

LOAD

= 35Ω 1.5

Startup Voltage

LOAD

= ∞, V

= 1.35V 1.2 1.55

Quiescent Current from OUT

(Main Only)

= V

FBLCD

= 1.35V,

ONLCD

= 0

510µA

Quiescent Current from OUT V

= V

FBLCD

= 1.35V 15 30 µA

Shutdown Quiescent Current V

= V

ONLCD

= 0 0.1 1 µA

MAIN OUTPUT

OUT

rising, V

= 1.35V 2.2 2.4

OUT Undervoltage Lockout

OUT

falling, V

= 1.35V 1.95 2.15

Fixed-Mode Output Voltage V

≤ 45mV 3.14 3.3 3.47 V

Adjustable-Mode FB Regulation

Voltage

1.20 1.25 1.30 V

FB Input Bias Current V

= 1.35V 50 nA

FB Dual Mode

Threshold 45 75 105 mV

Output Voltage Adjustment

Range

2.5 5.5 V

Maximum LX On-Time V

= 0.5V 2.4 5 7.5 µs

Zero Crossing Comparator

Threshold (V

- V

OUT

)

02040mV

Zero Crossing Comparator

Backup Timer

= +0.5V 22 45 70 µs

Line Regulation

OUT

= 100mA,

= +2V to +3V

1.6 %

Load Regulation

= +2.5V,

LOAD

= 10mA to 100mA

1.6 %

LX On-Resistance V

OUT

= 3.3V, I

= 100mA 0.35 0.65 Ω

LX Current Limit 0.5 0.75 1.05 A

Dual Mode is a trademark of Maxim Integrated Products.

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

Step-Up DC-DC Converter 1

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