Rainbow-electronics MAX1817 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1817

Compact, High-Efficiency, Dual-Output

Step-Up DC-DC Converter

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ELECTRICAL CHARACTERISTICS (continued)

= V

ONLCD

= V

OUT

= +3.3V, FB = GND, T

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

= +25°C.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

LX Leakage Current V

= GND, V

= 5.5V 0.1 1 µA

ON Input Low Voltage 1.8V < V

OUT

< 5.5V, V

= 0.5V 400 mV

ON Input High Voltage 1.8V < V

OUT

< 5.5V, V

= 0.5V 1.6 V

ON Input Bias Current 1µA

LCD OUTPUT

LXLCD Voltage 28 V

LXLCD On-Resistance V

OUT

= 3.3V, I

LXLCD

= 100mA 1.1 2.0 Ω

LXLCD Current Limit 0.28 0.5 0.7 A

LXLCD Leakage Current V

LXLCD

= 28V, V

ONLCD

= 0 0.1 1 µA

FBLCD Regulation Voltage 1.20 1.25 1.30 V

FBLCD Input Bias Current V

FBLCD

= 1.35V 50 nA

LCD Line Regulation I

LOAD

= 5mA, V

= +2V to +3V 0.1 %

LCD Load Regulation I

LOAD

= 1mA to 5mA, V

= +2.5V 0.5 %

Maximum LXLCD On-Time 4 9 14 µs

FBLCD

≥ 1.2V 0.5 1 1.5

Minimum LXLCD Off-Time

FBLCD

≤ 0.7V 2.4 5 7.5

µs

ONLCD Input Low Voltage 2.5V < V

OUT

< 5.5V 400 mV

ONLCD Input High Voltage 2.5V < V

OUT

< 5.5V 1.6 V

ONLCD Input Bias Current 1µA

ELECTRICAL CHARACTERISTICS

= V

ONLCD

= V

OUT

= +3.3V, FB = GND, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN MAX UNITS

GENERAL

Input Voltage Range 1.5 5.5 V

Startup Voltage R

LOAD

= ∞, V

= 1.35V 1.7 V

Quiescent Current from OUT

(Main Only)

= V

FBLCD

= 1.35V, V

ONLCD

= 0 10 µA

Quiescent Current from OUT V

= V

FBLCD

= 1.35V 30 µA

Shutdown Quiescent Current V

= V

ONLCD

= 0 1 µA

MAIN OUTPUT

OUT

rising, V

= 1.35V 2.4

OUT Undervoltage Lockout

OUT

falling, V

= 1.35V 1.95

Fixed-Mode Output Voltage V

≤ 45mV 3.14 3.47 V

Adjustable-Mode FB Regulation

Voltage

1.20 1.30 V

FB Input Bias Current V

= 1.35V 50 nA

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

Step-Up DC-DC Converter 1

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