Rainbow-electronics MAX1843 Manual do Utilizador descarregar pdf (Página 5)

MAX1843

2.7A, 1MHz, Low-Voltage, Step-Down Regulator with

Internal Synchronous Rectification in QFN Package

_______________________________________________________________________________________ 5

150

100

200

250

300

350

400

450

500

100

021 3456

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX1843 toc01

(V)

NO-LOAD SUPPLY CURRENT, I

+ I

(µA)

SHUTDOWN SUPPLY CURRENT, I

+ I

(nA)

NO LOAD

SHUTDOWN

Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

1.0

0.5

2.0

1.5

3.0

2.5

3.5

4.5

4.0

5.0

0 100 150 20050 250 300 350 450400 500

OFF-TIME vs. R

TOFF

MAX1843 toc02

TOFF

(kΩ)

OFF

(µs)

LOAD-TRANSIENT RESPONSE

OUTPUT

50mV/div

2A/div

MAX1843 toc09

10µs/div

LINE-TRANSIENT RESPONSE

INPUT

2V/div

OUTPUT

20mV/div

AC-COUPLED

MAX1843 toc10

20µs/div

OUT

= 2.5A, V

OUT

= +1.5V

TOFF

= 100kΩ, L = 2.2µH

400

200

800

600

1000

1200

0 1.0 1.50.5 2.0 2.5 3.0

SWITCHING FREQUENCY

vs. OUTPUT CURRENT

MAX1843 toc07

OUTPUT CURRENT (A)

FREQUENCY (kHz)

= +5V, V

OUT

= +2.5V, L = 2.5µH

= +3.3V, V

OUT

= +1.5V, L = 1.5µH

= +5V, V

OUT

= +1.5V, L = 2.5µH

STARTUP AND SHUTDOWN

2V/div

MAX1843 toc08

SHDN

5V/div

OUT

= 0.5Ω, R

TOFF

= 56kΩ

= +3.3V, V

OUT

= +1.5V

INPUT

1A/div

OUTPUT

1V/div

1ms/div

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

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