Rainbow-electronics MAX8982X Manual do Utilizador descarregar pdf (Página 20)

Power-Management ICs for

ICERA E400/E450 Platform

MAX8982A/MAX8982X

Typical Operating Characteristics (continued)

(MAX8982A: V

IN1A

= V

IN1B

= 5V, MAX8982X: V

IN1A

= V

IN1B

= V

DDA

= V

DDB

= V

IN4

= 3.3V, C

REFBP

= 0.1µF, T

= -40°C to +85°C,

Circuits of Figures 2 and 3, unless otherwise noted. Typical values are at T

= +25°C. Limits are 100% production tested at T

= +25NC,

unless otherwise noted. Limits over the temperature range are guaranteed by design.

)

NO LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (MAX8982X)

MAX8982A toc04

INPUT VOLTAGE (V)

5.0

4.54.03.53.0 5.5

SHUTDOWN CURRENT (uA)

120

140

160

180

200

220

240

260

280

300

100

OUT3 ON

ALL OTHER OUTPUTS OFF

BUCK1 LOAD REGULATION

MAX8982A toc05

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

700200

0.825

0.850

0.875

0.900

0.925

0.950

0.800

0 1200

L = 2.2µH, HITACHI METALS LTD

KSLI-252012AG-2R2

DCR = 100m

BUCK1 LOAD TRANSIENT

MAX8982A toc06

1.2A

1mA

AC-COUPLED

200mV/div

BUCK1

OUT

= 1V

OUT

= 10µF

BUCK1

100µs/div

BUCK1 EFFICIENCY

vs. LOAD CURRENT

MAX8982A toc07

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

100

1 1000

= 5.5V

OUT

= 0.9V

= 5V

= 4.5V

= 4.1V

BUCK1 SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX8982A toc08

LOAD CURRENT (mA)

SWITCHING FREQUENCY (MHz)

700200

0.5

1.0

1.5

2.0

2.5

0 1200

BUCK1 SWITCHING FREQUENCY

vs. TEMPERATURE

MAX8982A toc09

TEMPERATURE (°C)

SWITCHING FREQUENCY (MHz)

603510-15

1.800

1.850

1.900

1.950

2.000

2.050

2.100

2.150

2.200

1.750

-40 85

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 72 73

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