Rainbow-electronics MAX1797 Manual do Utilizador descarregar pdf (Página 6)

MAX1795/MAX1796/MAX1797

Low Supply Current, Step-Up DC-DC Converters

with True-Shutdown

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(L = 22µH, C

= 47µF, C

OUT

= 47µF, T

= +25°C, unless otherwise noted.)

0.800

0.850

0.825

0.900

0.875

0.925

0.950

0 1.0 1.5 2.00.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5

LOW-BATTERY INPUT THRESHOLD

vs. INPUT BATT VOLTAGE

BATT VOLTAGE (V)

LOW-BATTERY INPUT THRESHOLD (V)

MAX1795/96/97 toc10

INCREASING V

LBI

DECREASING V

LBI

100

150

200

250

0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5

MAX1795

MAXIMUM OUTPUT CURRENT

vs. BATT INPUT VOLTAGE

MAX1795/96/97 toc12

BATT VOLTAGE (V)

LOAD CURRENT (mA)

OUT

= +5.0V

OUT

= +3.3V

0.800

0.875

0.900

0.925

0.950

-40 10-15 35 60 85

MAX1795/96/97 toc12

TEMPERATURE (°C)

LOW-BATTERY INPUT THRESHOLD (V)

LOW-BATTERY INPUT THRESHOLD

vs. TEMPERATURE

BATT

= +3.6V

INCREASING V

LBI

DECREASING V

LBI

0.850

0.825

100

200

300

400

500

0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5

MAX1796

MAXIMUM OUTPUT CURRENT

vs. BATT INPUT VOLTAGE

MAX1795/96/97 toc13

BATT VOLTAGE (V)

LOAD CURRENT (mA)

OUT

= +5.0V

OUT

= +3.3V

200

400

600

800

1000

0 1.5 2.00.5 1.0 2.5 3.0 3.5 4.0 4.5

MAX1795/96/97 toc14

BATT VOLTAGE (V)

LOAD CURRENT (mA)

MAX1797

MAXIMUM OUTPUT CURRENT

vs. BATT INPUT VOLTAGE

OUT

= +3.3V

OUT

= +5.0V

0.4

0.8

1.2

1.6

2.0

0 1.0 1.50.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

OUT LEAKAGE CURRENT

vs. OUTPUT VOLTAGE

MAX1795/96/97 toc15

OUTPUT VOLTAGE (V)

OUT LEAKAGE CURRENT (µA)

SHDN = BATT

OUT

= +5V

BATT

= +2.4V

OUT BIASED WITH

EXTERNAL VOLTAGE

SOURCE

4.00µs/div

HEAVY-LOAD SWITCHING WAVEFORMS

MAX1795/96/97 toc16

5V/div

INDUCTOR

500mA/div

OUT

(AC-COUPLED)

100mV/div

= +3.6V

OUT

= +5.0V

LOAD

= 400mA

1 2 3 4 5 6 7 8 9 10 11 12 13

MAX1795/MAX1796/MAX1797 1

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