Rainbow-electronics MAX8982X Manual de usuario descargar pdf (Pagina 11)

Power-Management ICs for

ICERA E400/E450 Platform

MAX8982A/MAX8982X

11

BUCK3 ELECTRICAL CHARACTERISTICS (continued)

(MAX8982A only, V

IN1A

=

V

IN1B

= +5.0V, C

OUT1,2,3+CIN_

= 1000FF, C

REFBP

= 0.1FF, C

OUT

= 2.2FF, L = 2.2FH, T

A

= -40NC to

+85NC, unless otherwise noted. Typical values are at T

A

= +25NC.) (Note 3)

BUCK4 ELECTRICAL CHARACTERISTICS

(MAX8982A only, V

IN1A

=

V

IN1B

= +5.0V, C

OUT1,2,3+CIN_

= 1000FF, C

REFBP

= 0.1FF, C

OUT

= 20FF, L = 1FH, T

A

= -40NC to +85NC,

unless otherwise noted. Typical values are at T

A

= +25NC.) (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Current Limit

pFET switch 700 1100 1500

mA

nFET rectifier 500 750 1200

On-Resistance

pFET switch, I

LX3

= -150mA 0.65

I

nFET rectifier, I

LX3

= 150mA 0.3

Rectifier Off Current Threshold 80 mA

Minimum On-Time t

ON

70 ns

Minimum Off-Time t

OFF

70 ns

Shutdown Output Resistance

(Active Discharge Resistance)

I

2

C programmable, default off 1 kI

PARAMETER CONDITION MIN TYP MAX UNITS

Default Output Voltage I

LOAD

= 100mA 3.298 3.40 3.502 V

Programmable Output Voltage

I

LOAD

= 100mA,

programmable output voltage step = 50mV

3.00

V

3.05

3.10

3.15

3.20

3.25

3.30

3.35

3.40

3.45

3.50

3.55

3.60

3.65

3.70

3.75

Efficiency (Note 4) V

BUCK4

= 3.4V, I

LOAD

= 500mA 90 %

Maximum Output Current 1800 mA

p-Channel On-Resistance I

LX4

= 150mA 100 mI

n-Channel On-Resistance I

LX4

= 150mA 100 mI

p-Channel Current-Limit Threshold 2700 mA

n-Channel Negative Current Limit 1500 mA

Maximum Duty Cycle 100 %

Minimum Duty Cycle 16.5 %

PWM Frequency f

OSC

1.8 2.0 2.2 MHz

Shutdown Output Resistance

(Active Discharge Resistance)

I

2

C programmable,

default off

1 kI

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 72 73

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