Rainbow-electronics MAX8982X Manual de usuario Pagina 10

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Power-Management ICs for
ICERA E400/E450 Platform
MAX8982A/MAX8982X
10
BUCK2 ELECTRICAL CHARACTERISTICS
(MAX8982A: V
IN1A
=
V
IN1B
= +5.0V and C
OUT1,2,3+CIN_
= 1000FF, MAX8982X: V
IN1A
=
V
IN1B
= +3.3V and C
OUT1,2,3+CIN_
= 20FF,
C
REFBP
= 0.1FF, C
OUT
= 2.2FF, L = 1FH, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 3)
BUCK3 ELECTRICAL CHARACTERISTICS
(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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Current (Note 4) No load, no switching 26 FA
Output Voltage I
LOAD
= 100mA 1.746 1.8 1.854 V
Output Current V
BUCK2
= 1.8V, T
A
= +25NC 600 mA
Current Limit
pFET switch 700 1100 1500
mA
nFET rectifier 500 750 1200
On-Resistance
pFET switch, I
LX2
= -150mA 0.65
I
nFET rectifier, I
LX2
= 150mA 0.3
Rectifier Off Current Threshold 40 mA
Minimum On-Time t
ON
70 ns
Minimum Off-Time t
OFF
70 ns
Efficiency (Note 4) V
BUCK2
= 1.8V, I
LOAD
= 250mA 85 %
Shutdown Output Resistance
(Active Discharge Resistance)
I
2
C programmable, default ON 100
I
Output Load Regulation Equal to inductor DC resistance divided by 4 R
L
/4 V/A
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Current (Note 4) No load, no switching 40 FA
Default Output Voltage I
LOAD
= 100mA 3.10 3.2 3.29 V
Programmable Output Voltage
I
LOAD
= 100mA,
programmable output voltage step = 50mV
2.90
V
2.95
3.00
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
Maximum Output Current V
BUCK3
= 3.2V, T
A
= +25NC 600 mA
Efficiency (Note 4) V
BUCK3
= 3.2V, I
LOAD
= 300mA 90 %
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