Rainbow-electronics MAX8982X Uživatelský manuál stáhnout pdf (Strana 9)

Power-Management ICs for

ICERA E400/E450 Platform

MAX8982A/MAX8982X

GENERAL ELECTRICAL CHARACTERISTICS (continued)

(MAX8982A: V

IN1A

= V

IN1B

= +5.0V and C

OUT1,2,3+CIN_

= 1000FF, MAX8982X: V

IN1A

IN1B

= +3.3V and C

UT1,2,3+CIN_

= 20FF,

REFBP

= 0.1FF, T

= -40NC to +85NC. Typical values are at T

= +25NC, unless otherwise noted.) (Note 3)

BUCK1 ELECTRICAL CHARACTERISTICS

(MAX8982A: V

IN1A

= V

IN1B

= +5.0V and C

OUT1,2,3+CIN_

= 1000µF, MAX8982X: V

IN1A

= V

IN1B

= +3.3V and C

OUT1,2,3+CIN_

= 20µF,

REFBP

= 0.1µF, C

OUT

= 10µF, L = 2.2µH, T

= -40NC to +85NC, unless otherwise noted. Typical values are at T

= +25NC.) (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Maximum Pulse Width of Spikes

that Must be Suppressed by the

Input Filter of Both SDA and SCL

Signals

50 ns

Setup Time for STOP Condition

SU_STO

)

0.6 Fs

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Current (Note 4) No load, no switching 65 FA

Default Output Voltage I

LOAD

= 100mA 0.873 0.9 0.927 V

Output Voltage Accuracy

LOAD

= 100mA, V

BUCK1

tested at 0.6V, 0.775V, 1V,

1.2V in production (0.6V to 1.2V in 25mV steps)

-3 +3 %

Maximum Output Current V

BUCK1

= 0.9V, T

= +25NC 1200 mA

Current Limit

pFET switch 1400 1800 2500

nFET rectifier 1000 1400 1900

On-Resistance

pFET switch, I

LX1

= -150mA 0.3

nFET rectifier, I

LX1

= 150mA 0.15

Ramp-Up/Down Rate Control Same for both up and down

RASD1[0:1] = 00 5

mV/

RASD1[0:1] = 01 10

RASD1[0:1] = 10

12.5

(default)

RASD1[0:1] = 11 25

Rectifier Off Current Threshold 40 mA

Minimum On-Time t

40 ns

Minimum Off-Time t

OFF

40 ns

Efficiency (Note 4) V

BUCK1

= 0.9V, I

LOAD

= 400mA 85 %

Shutdown Output Resistance

(Active Discharge Resistance)

C programmable, default OFF 1 kI

Output Load Regulation Equal to inductor DC resistance divided by 4 R

/4 V/A

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 72 73

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