Rainbow Electronics MAX8982X - Manual (Page 10)

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 F A
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 F A
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 %