Rainbow-electronics MAX8982X Manual de usuario descargar pdf (Pagina 21)

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.

)

BUCK2 LOAD REGULATION

MAX8982A toc12

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

400200

1.740

1.760

1.780

1.800

1.820

1.720

0 600

L = 1.0µH, MURATA LQM2MPN1R0NG0

DCR = 85m

BUCK2 LOAD TRANSIENT

MAX8982A toc13

600mA

1mA

AC-COUPLED

100mV/div

OUT

= 1.8V

BUCK2

40µs/div

LOAD CURRENT (mA)

EFFICIENCY (%)

100101 1000

BUCK2 EFFICIENCY

vs. LOAD CURRENT

MAX8982A toc14

= 5.5V

= 5V

= 4.5V

= 4.1V

100

BUCK3 LOAD REGULATION

(MAX8982A ONLY)

MAX8982A toc15

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

500400300200100

3.050

3.100

3.150

3.200

3.250

3.300

3.000

0 600

L = 2.2µH, HITACHI METALS LTD

KSLI-252012AG-2R2

DCR = 100m

BUCK1 RAMP-UP TRANSITION

MAX8982A toc10

0.6V

1.2V

NO LOAD

12.5mV/µs RAMP RATE

BUCK1

20µs/div

BUCK1 RAMP-DOWN TRANSITION

MAX8982A toc11

0.6V

1.2V

OUT

= 1.2A

12.5mV/µs RAMP RATE

BUCK1

20µs/div

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 72 73

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Rainbow-electronics MAX8982X Manual de usuario Pagina 21

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